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560 results on '"Boynard, A."'

51. Avaliação da trajetória dos parafusos bicorticais pela técnica de harms e melcher em relação à artéria carótida interna: estudo experimental em cadáveres Evaluación de la trayectoria de los tornillos bicorticales en la técnica de harms y melcher en relación con la arteria carótida interna: un estudio experimental en cadáveres Evaluation of the trajectory of the bicortical screws in relation to the internal carotid artery, in fixation by the harms and melcher technique: an experimental study in cadavers

Author

Guilherme Zanini Rocha, Aluízio Augusto Arantes Junior, Cassius Vinicius Correa dos Reis, Sebastião Nataniel Silva Gusmão, Warley Martins, Arthur Adolfo Nicolato, Guilherme Lourenço Lima Reis, Fernando Flavio Vasconcelos Gonçalves, and Julio César Boynard Santiago

Subjects
Columna vertebral, Atlas cervical, Tornillos óseos, Arteria carótida interna, Cadáver, Tomografía, Coluna vertebral, Parafusos ósseos, Artéria carótida interna, Tomografia, Spine, Cervical atlas, bone screws, Carotid artery, internal, Cadaver, Tomography, Orthopedic surgery, RD701-811, Diseases of the musculoskeletal system, RC925-935
Abstract

OBJETIVO: O objetivo deste trabalho é estudar, em peças anatômicas; a relação entre os parafusos bicorticais pela técnica de Harms e Melcher e a artéria carótida interna. MÉTODOS: Nossa amostra consiste em cinco cadáveres. RESULTADOS: Os resultados encontrados foram: a média da menor distância entre o orifício de saída do parafuso e a borda medial da artéria carótida interna direita foi de 11,55 mm (com variação de 10,05 a 14,23 mm), enquanto do lado esquerdo a média foi de 7,50 mm (variando de 2,75 a 12,42 mm). A média da menor distância entre a borda posterior da artéria carótida interna e a cortical anterior da massa lateral de C1 à direita foi de 4,24 mm (variando de 2,08 a 7,48 mm), enquanto do lado esquerdo a média obtida foi de 2,98 mm (com variação de 1,83 a 3,83 mm). CONCLUSÃO: Os resultados encontrados estão de acordo com os estudos similares existentes na literatura que enfatizam a necessidade de uma avaliação imaginológica criteriosa da posição anatômica da artéria carótida interna antes da utilização de parafusos bicorticais na massa lateral de C1 por via posterior.OBJETIVO: O objetivo de este estudio es, en las piezas anatómicas, la relación entre los tornillos bicorticales, mediante la técnica de Harms y Melcher, y la arteria carótida interna. MÉTODOS: La muestra se compone de cinco cadáveres. RESULTADOS: Los resultados fueron: la distancia más corta promedio, entre la salida del tornillo y el borde medial de la arteria carótida interna derecha, fue 11,55 mm (rango de 10,05 a 14,23 mm), mientras que, en la izquierda, el promedio fue 7,50 mm (rango 2,75 a 12,42 mm). La distancia más corta promedio, entre el borde posterior de la arteria carótida interna y la cortical anterior C1 de la derecha, fue 4,24 mm (que van desde 2,08 hasta 7,48 mm), mientras que, en el lado izquierdo, el promedio fue 2,98 mm. (que van desde 1,83 hasta 3,83 mm). Conclusión: Los resultados son consistentes con estudios similares en la literatura que hacen hincapié en la necesidad de una evaluación cuidadosa de las imágenes y posición anatómica de la arteria carótida interna, antes del uso de tornillos bicorticales de masa lateral de C1 por acceso posterior.OBJECTIVE: The objective of this study is to study the relationship between bicortical screws and the internal carotid artery, in anatomical body parts, in screw fixation by the Harms and Melcher technique. METHODS: Our sample consisted of five cadavers. RESULTS: The results were as follows: the average shortest distance between the outlet of the screw and the medial edge of the right internal carotid artery was 11.55 mm (range 10.05 to 14.23 mm), while on the left side, the average was 7.50 mm (ranging from 2.75 to 12.42 mm). The average shortest distance between the posterior edge of the internal carotid artery and the anterior cortical C1 lateral mass on the right was 4.24 mm (ranging from 2.08 to 7.48 mm), while the left side, the average was 2.98 mm (ranging from 1.83 to 3.83 mm). CONCLUSION: The results are consistent with similar studies in the literature that emphasize the need for a careful assessment of images of anatomical position of the internal carotid artery prior to the use of bicortical screws in the C1 lateral mass by posterior access.

Published
2011
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52. Magnetic Maghemite Nanoparticles : Their Preparation, Properties, and Application in Cell Sorting and Characterization of Cellular Membranes in Vitro

Author

Halbreich, Avraham, Roger, Jacky, Pons, Jean-Noël, de Fatima Da Silva, Maria, Hasmonay, Eric, Roudier, Michel, Boynard, Michel, Sestier, Claude, Amri, Asmina, Geldwerth, Danielle, Fertil, Bernard, Bacri, Jean Claude, Sabolovic’, Domagoj, Häfeli, Urs, editor, Schütt, Wolfgang, editor, Teller, Joachim, editor, and Zborowski, Maciej, editor

Published
1997
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53. REPRESENTAÇÕES DO ESPAÇO GEOGRÁFICO EM DISPUTA: O MOVIMENTO NEGRO BRASILEIRO E AS NOVAS CARTOGRAFIAS SOCIAIS

Author

Lya Moret Boynard

Subjects
Human ecology. Anthropogeography, GF1-900, Geography (General), G1-922
Abstract

O trabalho discute o papel da cartografia como instrumento na luta anti-racismo do Movimento Negro. Há um cenário de disputa pela legitimidade hegemônica da leitura espacial e pelo protagonismo da produção cartográfica e esse trabalho vai mostrar a partir da análise de experiências em Mapeamento Social e Participativo, como o uso de novas cartografias sociais (feitas por, para e com o Movimento Negro), pode servir para endossar lutas do Movimento Social.

Published
2010
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54. Tropospheric ozone from IASI: comparison of different inversion algorithms and validation with ozone sondes in the northern middle latitudes

Author

R. Stübi, D. Moore, F. J. Schmidlin, K. Lambkin, M. López Bartolomé, R. Kivi, T. Koide, H. Kelder, H. Dier, B. Johnson, H. Claude, D. Hurtmans, P.-F. Coheur, S. Payan, A. Boynard, C. Clerbaux, J.-M. Flaud, M. Höpfner, G. Dufour, M. Eremenko, J. Orphal, and C. Keim

Subjects
Physics, QC1-999, Chemistry, QD1-999
Abstract

This paper presents a first statistical validation of tropospheric ozone products derived from measurements of the IASI satellite instrument. Since the end of 2006, IASI (Infrared Atmospheric Sounding Interferometer) aboard the polar orbiter Metop-A measures infrared spectra of the Earth's atmosphere in nadir geometry. This validation covers the northern mid-latitudes and the period from July 2007 to August 2008. Retrieval results from four different sources are presented: three are from scientific products (LATMOS, LISA, LPMAA) and the fourth one is the pre-operational product distributed by EUMETSAT (version 4.2). The different products are derived from different algorithms with different approaches. The difference and their implications for the retrieved products are discussed. In order to evaluate the quality and the performance of each product, comparisons with the vertical ozone concentration profiles measured by balloon sondes are performed and lead to estimates of the systematic and random errors in the IASI ozone products (profiles and partial columns). A first comparison is performed on the given profiles; a second comparison takes into account the altitude dependent sensitivity of the retrievals. Tropospheric columnar amounts are compared to the sonde for a lower tropospheric column (surface to about 6 km) and a "total" tropospheric column (surface to about 11 km). On average both tropospheric columns have small biases for the scientific products, less than 2 Dobson Units (DU) for the lower troposphere and less than 1 DU for the total troposphere. The comparison of the still pre-operational EUMETSAT columns shows higher mean differences of about 5 DU.

Published
2009

55. Evaluating the potential of IASI ozone observations to constrain simulated surface ozone concentrations

Author

M. Beekmann, A. Ung, A. Coman, A. Boynard, G. Dufour, C. Keim, M. Eremenko, C. Schmechtig, L. Hamaoui, and G. Foret

Subjects
Physics, QC1-999, Chemistry, QD1-999
Abstract

A tracer study has been performed for two summers in 2003 and 2004 with a regional chemistry-transport model in order to evaluate the potential constraint that tropospheric ozone observations from nadir viewing infrared sounders like IASI or TES exert on modelled near surface ozone. As these instruments show high sensitivity in the free troposphere, but low sensitivity at ground, it is important to know how much of the information gained in the free troposphere is transferred to ground through vertical transport processes. Within the European model domain, and within a time span of 4 days, only ozone like tracers initialised in vertical layers above 500 hPa are transported to the surface. For a tracer initialised between 800 and 700 hPa, seven percent reaches the surface within one to three days, on the average over the European model domain but more than double over the Mediterranean Sea. For this region, trajectory analysis shows that this is related to strong subsident transport. These results are confirmed by a second tracer study taking into account averaging kernels related to IASI retrievals, indicating the potential of these measurements to efficiently constrain surface ozone values.

Published
2009

56. Monitoring of atmospheric composition using the thermal infrared IASI/MetOp sounder

Author

C. Clerbaux, A. Boynard, L. Clarisse, M. George, J. Hadji-Lazaro, H. Herbin, D. Hurtmans, M. Pommier, A. Razavi, S. Turquety, C. Wespes, and P.-F. Coheur

Subjects
Physics, QC1-999, Chemistry, QD1-999
Abstract

Atmospheric remote sounding from satellites is an essential component of the observational strategy deployed to monitor atmospheric pollution and changing composition. The IASI nadir looking thermal infrared sounder onboard MetOp will provide 15 years of global scale observations for a series of key atmospheric species, with unprecedented spatial sampling and coverage. This paper gives an overview of the instrument's capability for measuring atmospheric composition in the perspective of chemistry and air quality. The assessment is made in terms of species, accuracy and vertical information. Global distributions are presented for CO, CH4, O3 (total and tropospheric), HNO3, NH3, and volcanic SO2. Local distributions of organic species measured during fire events, such as C2H4, CH3OH, HCOOH, and PAN are also shown. For each species or process, the link is made to specialized papers in this issue.

Published
2009

57. Measurements of total and tropospheric ozone from IASI: comparison with correlative satellite, ground-based and ozonesonde observations

Author

A. Boynard, C. Clerbaux, P.-F. Coheur, D. Hurtmans, S. Turquety, M. George, J. Hadji-Lazaro, C. Keim, and J. Meyer-Arnek

Subjects
Physics, QC1-999, Chemistry, QD1-999
Abstract

In this paper, we present measurements of total and tropospheric ozone, retrieved from infrared radiance spectra recorded by the Infrared Atmospheric Sounding Interferometer (IASI), which was launched on board the MetOp-A European satellite in October 2006. We compare IASI total ozone columns to Global Ozone Monitoring Experiment-2 (GOME-2) observations and ground-based measurements from the Dobson and Brewer network for one full year of observations (2008). The IASI total ozone columns are shown to be in good agreement with both GOME-2 and ground-based data, with correlation coefficients of about 0.9 and 0.85, respectively. On average, IASI ozone retrievals exhibit a positive bias of about 9 DU (3.3%) compared to both GOME-2 and ground-based measurements. In addition to total ozone columns, the good spectral resolution of IASI enables the retrieval of tropospheric ozone concentrations. Comparisons of IASI tropospheric columns to 490 collocated ozone soundings available from several stations around the globe have been performed for the period of June 2007–August 2008. IASI tropospheric ozone columns compare well with sonde observations, with correlation coefficients of 0.95 and 0.77 for the [surface–6 km] and [surface–12 km] partial columns, respectively. IASI retrievals tend to overestimate the tropospheric ozone columns in comparison with ozonesonde measurements. Positive average biases of 0.15 DU (1.2%) and 3 DU (11%) are found for the [surface–6 km] and for the [surface–12 km] partial columns respectively.

Published
2009

58. Detection of extreme events from IASI observations

Author

Vu Van, Adrien, primary, Boynard, Anne, additional, Prunet, Pascal, additional, Jolivet, Dominique, additional, Lezeaux, Olivier, additional, Henry, Patrice, additional, Camy-Peyret, Claude, additional, and Clerbaux, Cathy, additional

Published
2022
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59. Principal Component Analysis of IASI measurements for the detection of extreme events: methodology and application to the detection of rare spectral signatures

Author

Prunet, Pascal, Pipien, Sarah, Camy-Peyret, Claude, Lezeaux, Olivier, Jolivet, Dominique, Monsterleet, Bruno, Vuvan, Adrien, Boynard, Anne, Clerbaux, Cathy, Henry, Patrice, Le Barbier, Laura, Sté SPASCIA, Institut Pierre-Simon-Laplace (IPSL (FR_636)), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), HYGEOS (SARL), TROPO - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Centre National d'Études Spatiales [Toulouse] (CNES), and Cardon, Catherine

Subjects
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], [PHYS.PHYS.PHYS-AO-PH] Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph]
Abstract

International audience; We have implemented and tested the feasibility and performances of a systematic and global processing of IASI L1 measurements based on the Principal Component Analysis (PCA) of the spectra, for the fast detection, identification and monitoring of atmospheric extreme events.

Published
2021

61. Evaluation of interannual variability of Arctic and Antarctic ozone loss since 1989

Author

Kristof Bognar, Steve Colwell, Anne Boynard, Audrey Lecouffe, Michel VanRoozendael, Cathy Clerbaux, Andrea Pazmino, Alain Hauchecorne, Kaley A. Walker, Florence Goutail, Kimberly Strong, Sophie Godin-Beekmann, Nis Jepsen, Rigel Kivi, Jean-Pierre Pommereau, Georg Hansen, Wuhu Feng, Franck Lefèvre, Martyn P. Chipperfield, Juliette Hadji-Lazaro, STRATO - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Sorbonne Université (SU)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS), TROPO - LATMOS, School of Earth and Environment [Leeds] (SEE), University of Leeds, Belgian Institute for Space Aeronomy / Institut d'Aéronomie Spatiale de Belgique (BIRA-IASB), Danish Meteorological Institute (DMI), Norsk Institutt for Luftforskning (NILU), Finnish Meteorological Institute (FMI), Department of Physics [Toronto], University of Toronto, British Antarctic Survey (BAS), and Natural Environment Research Council (NERC)

Subjects
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], chemistry.chemical_compound, Ozone, Arctic, chemistry, 13. Climate action, Mass deficit, Ozone layer, Climate change, Climate model, Atmospheric sciences, Ozone depletion, Brewer-Dobson circulation
Abstract

Ozone depletion over Polar Regions is monitored each year by satellite and ground-based instruments. The first signs of healing of the ozone layer linked to the decrease of ozone destructive substances (ODSs) were observed in Antarctica using different metrics (ozone mean values, ozone mass deficit, area of the ozone hole) and simple or sophisticated models. Chemistry climate models predict that climate change will not affect expected ozone recovery over Antarctica but will accelerate recovery in the Arctic due to the possible enhancement of the Brewer Dobson circulation. However, ozone loss observations by SAOZ UV-Vis spectrometers do not show a clear sign of recovery in the latter region. In addition, a record of 38% ozone loss in 2010/2011 and 2019/2020 was estimated.In this study, the vortex-averaged ozone loss in the last three decades will be evaluated for both Polar Regions using the passive ozone tracer of two chemical transport models (REPROBUS and SLIMCAT CTMs) and total ozone observations from SAOZ and satellite observations (IASI/METOP and Multi-Sensor Reanalysis (MSR-2)).The tracer method allows us to determine the evolution of the daily rate of ozone destruction, and the amplitude of the cumulative loss at the end of the winter. The cumulative ozone destruction in the Artic varies between 0-10% in relatively warm winters with short vortex duration to up to 25-38% in colder winters with longer vortex persistence, while in Antarctica it is mostly stable, around 50%.Interannual variability of 10-days average rate will be analyzed and compared between both hemispheres as well as the timing to reach different thresholds of absolute ozone loss values. Finally, linear trend of ozone loss and temperature since 2000 will be estimated in both Polar Regions in order to evaluate possible ozone recovery.

Published
2021
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62. Near-real time detection of unexpected atmospheric events using Principal Component Analysis on the IASI radiances.

Author

Van, Adrien Vu, Boynard, Anne, Prunet, Pascal, Jolivet, Dominique, Lezeaux, Olivier, Henry, Patrice, Camy-Peyret, Claude, Clarisse, Lieven, Franco, Bruno, Coheur, Pierre-François, and Clerbaux, Cathy

Subjects
MULTIPLE correspondence analysis (Statistics), CLIMATE change, CLIMATOLOGY, WORK-related injuries, PRINCIPAL components analysis
Abstract

The three IASI instruments on-board the Metop family of satellites have been sounding the atmospheric composition since 2006. More than 30 atmospheric gases can be measured from the IASI radiance spectra, allowing the improvement of weather forecasting, and the monitoring of atmospheric chemistry and climate variables. The early detection of extreme events such as fires, pollution episodes, volcanic eruptions, or industrial releases is key to take safety measures to protect inhabitants and the environment in the impacted areas. With its near real time observations and good horizontal coverage, IASI can contribute to the series of monitoring systems for the systematic and continuous detection of exceptional atmospheric events, in order to support operational decisions. In this paper, we describe a new approach for the near real time detection and characterization of unexpected events, which relies on the principal component analysis (PCA) of IASI radiance spectra. By analysing both the IASI raw and compressed spectra, we applied a PCA-granule based method on various past well documented extreme events such as volcanic eruptions, fires, anthropogenic pollutions and industrial accidents. We demonstrate that the method is well suited to detect spectral signatures for reactive and weak absorbing gases, even for sporadic events. Long-term records are also generated for fire and volcanic events, by analysing the available IASI/Metop-B data record. [ABSTRACT FROM AUTHOR]

Published
2022
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64. The IASI/AERIS portal: dissemination of atmospheric data in open access

Author

Boynard, Anne, Boonne, C., Hadji-Lazaro, Juliette, Clerbaux, Cathy, George, Maya, Clarisse, Lieven, Damme, M. Van, Whitburn, S., Hurtmans, Daniel, Coheur, Pierre-François, Capelle, V., Crevoisier, C., Cuesta, J., Stubenrauch, C., Cardon, Catherine, TROPO - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Institut Pierre-Simon-Laplace (IPSL (FR_636)), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Spectroscopy, Quantum Chemistry and Atmospheric Remote Sensing (SQUARES), Université libre de Bruxelles (ULB), Laboratoire de Météorologie Dynamique (UMR 8539) (LMD), Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-École des Ponts ParisTech (ENPC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)

Subjects
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], ComputingMilieux_MISCELLANEOUS, [PHYS.PHYS.PHYS-AO-PH] Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph]
Abstract

International audience

Published
2021

65. Overview of the stratospheric O3 measurements from IASI (2008-2020): validation, variability, events, evolution, recovery and radiative effect

Author

Wespes, Catherine, Hurtmans, Daniel, Boynard, Anne, Safieddine, Sarah, Bouillon, Marie, Chabrillat, Simon, Doniki, Stamatia, Clerbaux, Cathy, Coheur, Pierre-François, and Cardon, Catherine

Subjects
Amospheric Ozone, [SDU.OCEAN] Sciences of the Universe [physics]/Ocean, Atmosphere, IASI Instrument, Measurement Instrument, [PHYS.PHYS.PHYS-AO-PH] Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph]
Published
2021

66. Intercomparison between the three French IASI ozone products (IASI-FORLI, IASI-KOPRA and IASI-SOFRID)

Author

Boynard, Anne, Barret, Brice, Clerbaux, Cathy, Coheur, Pierre-François, Dufour, Gaëlle, Eremenko, M., Hurtmans, Daniel, Hadji-Lazaro, Juliette, Leflochmoen, E., Wespes, Catherine, Cardon, Catherine, TROPO - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'aérologie (LAERO), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Spectroscopy, Quantum Chemistry and Atmospheric Remote Sensing (SQUARES), Université libre de Bruxelles (ULB), Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA (UMR_7583)), and Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)

Subjects
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], ComputingMilieux_MISCELLANEOUS, [PHYS.PHYS.PHYS-AO-PH] Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph]
Abstract

International audience

Published
2021

67. Detection of extreme events from IASI observations

Author

Vuvan, Adrien, Boynard, Anne, Prunet, Pascal, Jolivet, Dominique, Lezeaux, Olivier, Henry, Patrice, Camy-Peyret, Claude, Coheur, Pierre-François, Clarisse, Lieven, Clerbaux, Cathy, Cardon, Catherine, TROPO - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Sté SPASCIA, HYGEOS (SARL), Centre National d'Études Spatiales [Toulouse] (CNES), Institut Pierre-Simon-Laplace (IPSL (FR_636)), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Spectroscopy, Quantum Chemistry and Atmospheric Remote Sensing (SQUARES), and Université libre de Bruxelles (ULB)

Subjects
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], ComputingMilieux_MISCELLANEOUS, [PHYS.PHYS.PHYS-AO-PH] Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph]
Abstract

International audience

Published
2021

68. 2020: a very special year documented by IASI

Author

Clerbaux, Cathy, George, Maya, Boynard, Anne, Safieddine, Sarah, Hadji-Lazaro, Juliette, Viatte, Camille, Katchourine, Gaëlle, Hurtmans, Daniel, Coheur, Pierre-François, and Cardon, Catherine

Subjects
IASI Instrument, Measurement Instrument, [PHYS.PHYS.PHYS-AO-PH] Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph]
Published
2021

70. Use and impact of PCA reconstructed radiances for atmospheric composition applications

Author

IASI 2021 Conference (Evian, France), De Longueville, Hélène, Clarisse, Lieven, Hurtmans, Daniel, Franco, Bruno, Coheur, Pierre, Clerbaux, Cathy, Boynard, Anne, Coppens, Dorothée, August, Thomas, Hultberg, Tim, IASI 2021 Conference (Evian, France), De Longueville, Hélène, Clarisse, Lieven, Hurtmans, Daniel, Franco, Bruno, Coheur, Pierre, Clerbaux, Cathy, Boynard, Anne, Coppens, Dorothée, August, Thomas, and Hultberg, Tim

Abstract

The IASI mission has been developed with the objective to provide high-quality radiance spectra and global measurements of atmospheric parameters, for accurate Numerical Weather Predictions (NWP) and improved climate and atmospheric composition (AC) monitoring. This led to the design of an advanced hyperspectral infrared instrument, featuring, at Level1C a large spectral range of the infrared without gaps (645-2760 cm-1), a fairly high spectral resolution (0.5 cm-1) and a low noise. These Level1C radiances have been exploited extensively in the last decade for applications in air quality, climate, tropospheric and stratospheric chemistry. There is in fact an impressive series of atmospheric trace gases that are retrieved from IASI Level1C, including several that display very small spectral signatures or others that appear only around localized pollution sources or in volcanic and fire plumes. Because of the potential loss of information coming with principal component analysis (PCA) –especially for rare signals- the scientific community has, until now, favored the use of the native Level1C over PCA-reconstructed radiances, despite the reduction of noise that the latter allow. In this presentation we will show results obtained during a dedicated study with IASI spectra over a decade, with the objective1. to evaluate how well the IASI Level1C can be reconstructed from the eigenvectors routinely produced at EUMETSAT, and to document the added value of the so-called dynamic hybrid over the static core base eigenvectors for rare or extreme situations. 2. To evaluate to what extent the use of reconstructed radiances impacts the retrieval of trace gases, in background or extreme situations.The results concern ozone (validation of the retrieved profiles against ozone sondes), carbon monoxide, ammonia and sulfur dioxide in volcanic plumes. Based on these results, recommendations for using reconstructed radiances in an operational processing framework are made. This is import, info:eu-repo/semantics/nonPublished

Published
2021

71. Use and impact of PCA-reconstructed radiances for atmospheric composition applications

Author

EUMETSAT Meteorological Satellite conference 2021 (20-24 September 2021: Bucharest, Romania), De Longueville, Hélène, Clarisse, Lieven, Hurtmans, Daniel, Franco, Bruno, Coheur, Pierre, Boynard, Anne, Clerbaux, Cathy, Hultberg, Tim, August, Thomas, Coppens, Dorothée, EUMETSAT Meteorological Satellite conference 2021 (20-24 September 2021: Bucharest, Romania), De Longueville, Hélène, Clarisse, Lieven, Hurtmans, Daniel, Franco, Bruno, Coheur, Pierre, Boynard, Anne, Clerbaux, Cathy, Hultberg, Tim, August, Thomas, and Coppens, Dorothée

Abstract

The IASI mission has been developed with the objective to provide high-quality radiance spectra and global measurements of atmospheric parameters, for accurate Numerical Weather Predictions (NWP) and improved climate and atmospheric composition (AC) monitoring. This led to the design of an advanced hyperspectral infrared instrument, featuring, at Level1C a large spectral range of the infrared without gaps (645-2760 cm-1), a fairly high spectral resolution (0.5 cm-1) and a low noise. These Level1C radiances have been exploited extensively in the last decade for applications in air quality, climate, tropospheric and stratospheric chemistry. There is in fact an impressive series of atmospheric trace gases that are retrieved from IASI Level1C, including several that display very small spectral signatures or others that appear only around localized pollution sources or in volcanic and fire plumes. Because of the potential loss of information coming with principal component analysis (PCA) –especially for rare signals- the scientific community has, until now, favored the use of the native Level1C over PCA-reconstructed radiances, despite the reduction of noise that the latter allow. In this presentation we will show results obtained during a dedicated study with IASI spectra over a decade, with the objective 1. to evaluate how well the IASI Level1C can be reconstructed from the eigenvectors routinely produced at EUMETSAT, and to document the added value of the so-called dynamic hybrid over the static core base eigenvectors for rare or extreme situations. 2. To evaluate to what extent the use of reconstructed radiances impacts the retrieval of trace gases, in background or extreme situations.The results concern ozone (validation of the retrieved profiles against ozone sondes), carbon monoxide, ammonia and sulfur dioxide in volcanic plumes. Based on these results, recommendations for using reconstructed radiances in an operational processing framework are made. This is impor, info:eu-repo/semantics/nonPublished

Published
2021

72. The IASI/AERIS portal: dissemination of atmospheric data in open access

Author

2021 IASI conference, Boynard, Anne, Boonne, C., Hadji-Lazaro, Juliette, Clerbaux, Cathy, George, Maya, Clarisse, Lieven, Van Damme, Martin, Whitburn, Simon, Hurtmans, Daniel, Coheur, Pierre, Capelle, Virginie, Crevoisier, Cyril, Cuesta, J. A., Stubenrauch, C., 2021 IASI conference, Boynard, Anne, Boonne, C., Hadji-Lazaro, Juliette, Clerbaux, Cathy, George, Maya, Clarisse, Lieven, Van Damme, Martin, Whitburn, Simon, Hurtmans, Daniel, Coheur, Pierre, Capelle, Virginie, Crevoisier, Cyril, Cuesta, J. A., and Stubenrauch, C.

Abstract

info:eu-repo/semantics/published

Published
2021

74. IASI Satellite Observations during the Covid-19 Lockdown

Author

Clerbaux, Cathy, Boynard, Anne, George, Maya, Hadji-Lazaro, Juliette, Safieddine, Sarah, Viatte, Camille, Coheur, Pierre-François, TROPO - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Sorbonne Université (SU)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS), Spectroscopy, Quantum Chemistry and Atmospheric Remote Sensing (SQUARES), Université libre de Bruxelles (ULB), WMO, and Cardon, Catherine

Subjects
[SDE] Environmental Sciences, [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], [SDE]Environmental Sciences, [PHYS.PHYS.PHYS-AO-PH] Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2020

75. Total ozone loss during the 2019/20 Arctic winter and comparison to previous years

Author

Anne Boynard, Michel Van Roozendael, Kaley A. Walker, Juliette Hadji-Lazaro, Wuhu Feng, Kimberly Strong, Martyn P. Chipperfield, Andrea Pazmino, Nis Jepsen, Jean-Pierre Pommereau, Kristof Bognar, Cathy Clerbaux, Rigel Kivi, Florence Goutail, Franck Lefèvre, Georg Hansen, STRATO - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Sorbonne Université (SU)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS), TROPO - LATMOS, School of Earth and Environment [Leeds] (SEE), University of Leeds, Belgian Institute for Space Aeronomy / Institut d'Aéronomie Spatiale de Belgique (BIRA-IASB), Danish Meteorological Institute (DMI), Norwegian Institute for Air Research (NILU), Finnish Meteorological Institute (FMI), Department of Physics [Toronto], and University of Toronto

Subjects
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, Ozone, Chemical transport model, Polar night, Atmospheric sciences, Ozone depletion, Latitude, chemistry.chemical_compound, Polar circle, chemistry, Arctic, 13. Climate action, Environmental science, Stratosphere
Abstract

The amplitude of ozone depletion in the Arctic is monitored every year since 1990 by comparison between total ozone measurements of SAOZ / NDACC UV-Vis spectrometers deployed in the Arctic and 3-D chemical transport model simulations in which ozone is considered as a passive tracer.When SAOZ measurements are missing for various reasons, lack of sunlight, station closed or instrument failure, they are replaced since 2017 by IASI/Metop overpasses above the station. These measurements in the thermal Infrared are available all year around, at all latitudes even in the polar night. IASI data have been compared to SAOZ and to 3-D CTM REPROBUS and the agreement is better than 3% at the latitude of the polar circle.The method allows determining the evolution of the daily rate of the ozone destruction and the amplitude of the cumulative loss at the end of the winter. The amplitude of the destruction varies between 0-10% in relatively warm and short vortex duration years up to 25-39% in colder and longer ones.Since a strong and large vortex centred at the North Pole, PSCs and activated chlorine are still present at all levels in the lower stratosphere on January 9, 2020, there is a good probability that a significant O3 loss may happen in 2020. But since, as shown by the unprecedented depletion of 39% in 2010/11, the loss depends on the vortex duration, strength and possible re-noxification, it is difficult to predict in advance the amplitude of the cumulative loss at the end of the winter.Shown in this presentation will be the evolution of ozone loss and re-noxification in the Arctic vortex during the winter 2019/20 compared to previous winters and REPROBUS and SLIMCAT CTM simulations.

Published
2020
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76. Detection of extreme events with IASI observations

Author

Adrien Vu Van, Anne Boynard, Pascal Prunet, Dominique Jolivet, Olivier Lezeaux, Patrice Henry, Claude Camy-Peyret, and Cathy Clerbaux

Abstract

The 3 IASI instruments on-board the Metop satellites have been sounding the atmospheric composition since 2006. Up to ~30 atmospheric gases can be measured from IASI spectra, allowing monitoring of weather, atmospheric chemistry, and climate.Extreme events such as fires, high pollution episodes, volcanic eruptions, industrial accidents, etc., that impact on the population and the environment have become a major political issue. With IASI providing global observations twice a day in near real time, a new way for the systematic and continuous detection of exceptional atmospheric events to support operational decisions is possible.In this work, we explore and improve an automatic system for the detection and characterization of extreme events, which relies on the principal component analysis (PCA) method. We assess this PCA-based system by analysing IASI raw and compressed spectra along with their differences (residuals) for various past and documented extreme events. The benefits and limitations of this method will be discussed. A new method based on the refined analysis of residuals for the whole year 2019 is proposed, that could be used as an automatic detection method for unexpected events. Finally, we investigate the potential of deep learning methods as a way to compare residuals with a database of extreme event in order to better characterize detected events.

Published
2020
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77. IASI observations at the city scale

Author

Juliette Hadji-Lazaro, Cathy Clerbaux, Sarah Safieddine, Ana Paracho, Simon Whitburn, Anne Boynard, Pierre-François Coheur, Maya George, and Lieven Clarisse

Subjects
Geography, Climatology, City scale
Abstract

IASI is a versatile mission, allowing the measurement of both meteorological parameters such as temperature and atmospheric composition for infrared absorbing species. With its long observation record and frequent overpasses, IASI is able to follow changes at different spatial scales. We studied IASI’s capability to track the anthropogenic signature associated with large cities, both in terms of temperature fingerprint (urban heat islands) and carbon monoxide (CO) content, a good tracer of human activity (transport, heating, and industrial activities). For this study we averaged the IASI data available since the launch of the first IASI, in order to increase the signal to noise, and allow discriminating the city from its surroundings. For skin temperatures we show that some cities experience much warmer temperatures than nearby rural areas, with day and night differences, whereas other urban areas appear as cold urban islands when surrounded by deserts Examples will be shown and compare with MODIS observations. For CO emitted by human activities, we identified some cities that stand out from their background, and were able to compare their CO associated signatures with measurements provided by other available spaceborne instruments such as Mopitt and TROPOMI.

Published
2020
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78. Antarctic ozone enhancement during the 2019 sudden stratospheric warming event

Author

Florent Tence, Slimane Bekki, Sarah Safieddine, Cathy Clerbaux, Daniel Hurtmans, Pierre-François Coheur, Florence Goutail, Julien Jumelet, Marie Bouillon, Anne Boynard, Andrea Pazmino, Catherine Wespes, Juliette Hadji-Lazaro, Ana‐claudia Paracho, TROPO - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Sorbonne Université (SU)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS), STRATO - LATMOS, Spectroscopy, Quantum Chemistry and Atmospheric Remote Sensing (SQUARES), and Université libre de Bruxelles (ULB)

Subjects
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, Ozone, 010504 meteorology & atmospheric sciences, Infrared atmospheric sounding interferometer, Total ozone, Sudden stratospheric warming, 010502 geochemistry & geophysics, Atmospheric sciences, 01 natural sciences, Latitude, Ground station, chemistry.chemical_compound, Geophysics, chemistry, 13. Climate action, General Earth and Planetary Sciences, Polar, Environmental science, Southern Hemisphere, 0105 earth and related environmental sciences
Abstract

International audience; We analyze the 2019 sudden stratospheric warming event that occurred in the Southern Hemisphere through its impact on the Antarctic ozone. Using temperature, ozone, and nitric acid data from the Infrared Atmospheric Sounding Interferometer (IASI), our results show that the average increase in stratospheric temperature reached a maximum of 34.4° on September 20th in the [60‐90]°S latitude range when compared to the past three years. Dynamical parameters suggest a locally‐reversed and weakened zonal winds and a shift in the location of the polar jet vortex. This led to air masses mixing, to a reduced polar stratospheric clouds formation detected at a ground station, and as such to lower ozone and nitric acid depletion. 2019 total ozone columns for the months of September, October, and November, were on average higher by 29%, 28%, and 26% respectively when compared to the 11‐year average of the same months.

Published
2020
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80. Antarctic Ozone Enhancement During the 2019 Sudden Stratospheric Warming Event

Author

Safieddine, Sarah, Bouillon, Marie M., Paracho, Ana Claudia, Jumelet, Julien, Tencé, Florent, Pazmino, Andrea, Goutail, Florence, Wespes, Catherine, Bekki, Slimane SB, Boynard, Anne, Hadji-Lazaro, Juliette, Coheur, Pierre, Hurtmans, Daniel, Clerbaux, Cathy, Safieddine, Sarah, Bouillon, Marie M., Paracho, Ana Claudia, Jumelet, Julien, Tencé, Florent, Pazmino, Andrea, Goutail, Florence, Wespes, Catherine, Bekki, Slimane SB, Boynard, Anne, Hadji-Lazaro, Juliette, Coheur, Pierre, Hurtmans, Daniel, and Clerbaux, Cathy

Abstract

We analyze the 2019 sudden stratospheric warming event that occurred in the Southern Hemisphere through its impact on the Antarctic ozone. Using temperature, ozone, and nitric acid data from the Infrared Atmospheric Sounding Interferometer (IASI), our results show that the average increase in stratospheric temperature reached a maximum of 34.4° on 20 September in the [60–90]°S latitude range when compared to the past 3 years. Dynamical parameters suggest a locally reversed and weakened zonal winds and a shift in the location of the polar jet vortex. This led to air masses mixing, to a reduced polar stratospheric clouds formation detected at a ground station, and as such to lower ozone and nitric acid depletion. 2019 total ozone columns for the months of September, October, and November were on average higher by 29%, 28%, and 26%, respectively, when compared to the 11-year average of the same months., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2020

81. Evaluation of sickle cell aggregation by ultrasound backscattering

Author

M. Boynard, Y. Beuzardz, and M. Razavian

Subjects
Pathology, medicine.medical_specialty, Physiology, business.industry, Ultrasound, Hematology, 030204 cardiovascular system & hematology, medicine.disease, Sickle cell anemia, Cell aggregation, 030218 nuclear medicine & medical imaging, 03 medical and health sciences, 0302 clinical medicine, Hemoglobinopathy, Physiology (medical), medicine, Cardiology and Cardiovascular Medicine, Agrégation, business
Published
2018
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82. Rheological properties of desialylated erythrocytes studied by ultrasound backscattering and filtration

Author

Dimitris Koutsouris, E. Delatour-Hanss, M. Boynard, and L. Gattegno

Subjects
Chromatography, Physiology, business.industry, Ultrasound, Analytical chemistry, Hematology, law.invention, Sialic acid, Electrophoresis, chemistry.chemical_compound, Red blood cell, medicine.anatomical_structure, Rheology, chemistry, law, Physiology (medical), medicine, Cardiology and Cardiovascular Medicine, Agrégation, business, Filtration
Published
2018
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83. Decrease in tropospheric O3 levels in the Northern Hemisphere observed by IASI

Author

Daniel Hurtmans, Anne Boynard, Pierre-François Coheur, Cathy Clerbaux, and Catherine Wespes

Subjects
Atmospheric Science, 010504 meteorology & atmospheric sciences, Correlation coefficient, Northern Hemisphere, 010501 environmental sciences, Infrared atmospheric sounding interferometer, Covariance, 01 natural sciences, Latitude, Troposphere, chemistry.chemical_compound, chemistry, 13. Climate action, Middle latitudes, Climatology, Environmental science, Tropospheric ozone, 0105 earth and related environmental sciences
Abstract

In this study, we describe the recent changes in the tropospheric ozone (O 3 ) columns measured by the Infrared Atmospheric Sounding Interferometer (IASI), onboard the Metop satellite, during the first 9 years of operation (January 2008 to May 2017). Using appropriate multivariate regression methods, we differentiate significant linear trends from other sources of O 3 variations captured by IASI. The geographical patterns of the adjusted O 3 trends are provided and discussed on the global scale. Given the large contribution of the natural variability in comparison with that of the trend (25–85 % vs. 15–50 %, respectively) to the total O 3 variations, we estimate that additional years of IASI measurements are generally required to detect the estimated O 3 trends with high precision. Globally, additional 6 months to 6 years of measurements, depending on the regions and the seasons, are needed to detect a trend of | 5 | DU decade −1 . An exception is interestingly found during summer at mid- and high latitudes of the Northern Hemisphere (NH; ∼ 40 to ∼ 75 ∘ N), where the large absolute fitted trend values ( ∼ | 0.5 | DU yr −1 on average) combined with the small model residuals ( ∼ 10 %) allow for detection of a band-like pattern of significant negative trends. Despite no consensus in terms of tropospheric O 3 trends having been reached from the available independent datasets (UV or IR satellites, O 3 sondes, aircrafts, ground-based measurements, etc.) for the reasons that are discussed in the text, this finding is consistent with the reported decrease in O 3 precursor emissions in recent years, especially in Europe and USA. The influence of continental pollution on that latitudinal band is further investigated and supported by the analysis of the O 3 –CO relationship (in terms of correlation coefficient, regression slope and covariance) that we found to be the strongest at northern midlatitudes in summer.

Published
2018
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84. Evaluation of interannual variability of Arctic and Antarctic ozone loss since 1989

Author

Goutail, Florence, primary, Pazmino, Andrea, additional, Pommereau, Jean-Pierre, additional, Lefevre, Franck, additional, Godin-Beekmann, Sophie, additional, Hauchecorne, Alain, additional, Lecouffe, Audrey, additional, Clerbaux, Cathy, additional, Boynard, Anne, additional, Hadji-Lazaro, Juliette, additional, Chipperfield, Martyn, additional, Feng, Wuhu, additional, VanRoozendael, Michel, additional, Jepsen, Nis, additional, Hansen, Georg, additional, Kivi, Rigel, additional, Bognar, Kristof, additional, Strong, Kimberly, additional, Walker, Kaley, additional, and Colwell, Steve, additional

Published
2021
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85. ARQUITETURA, ESCOLA E MEMÓRIA: O EDIFÃCIO DO LICEU DE HUMANIDADES DE CAMPOS

Author

Silvia Alicia Martínez, Marcelo Carlos Gantos, and Maria Amelia de Almeida Pinto Boynard

Subjects
cultura escolar, arquitetura, cidade, Education, History of education, LA5-2396
Abstract

Este texto trata da arquitetura e das diferentes funções de ocupação de um prédio da cidade de Campos dos Goytacazes, norte do Estado do Rio de Janeiro. Ãcone da próspera economia rural do Século XIX na região, o Solar foi construído para residência de um Barão. Em 1883 foi adquirido para que nele se instalasse o Liceu de Humanidades de Campos. A instalação de uma escola secundária, pública, num Solar aristocrático nos permite estabelecer relações entre arquitetura, escola e memória social na tentativa de entender a cultura escolar que ali se forjou.

Published
2008

87. Antarctic Ozone Enhancement During the 2019 Sudden Stratospheric Warming Event

Author

Safieddine, Sarah, primary, Bouillon, Marie, additional, Paracho, Ana‐Claudia, additional, Jumelet, Julien, additional, Tencé, Florent, additional, Pazmino, Andrea, additional, Goutail, Florence, additional, Wespes, Catherine, additional, Bekki, Slimane, additional, Boynard, Anne, additional, Hadji‐Lazaro, Juliette, additional, Coheur, Pierre‐François, additional, Hurtmans, Daniel, additional, and Clerbaux, Cathy, additional

Published
2020
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88. Total ozone loss during the 2019/20 Arctic winter and comparison to previous years

Author

Goutail, Florence, primary, Pommereau, Jean-Pierre, additional, Pazmino, Andrea, additional, Lefevre, Franck, additional, Clerbaux, Cathy, additional, Boynard, Anne, additional, Hadji-Lazaro, Juliette, additional, Chipperfield, Martyn, additional, Feng, Wuhu, additional, Van Roozendael, Michel, additional, Jepsen, Nis, additional, Hansen, Georg, additional, Kivi, Rigel, additional, Bognar, Kristof, additional, Strong, Kimberly, additional, and Walker, Kaley, additional

Published
2020
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89. Detection of extreme events with IASI observations

Author

Vu Van, Adrien, primary, Boynard, Anne, additional, Prunet, Pascal, additional, Jolivet, Dominique, additional, Lezeaux, Olivier, additional, Henry, Patrice, additional, Camy-Peyret, Claude, additional, and Clerbaux, Cathy, additional

Published
2020
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90. IASI observations at the city scale

Author

Safieddine, Sarah, primary, George, Maya, additional, Clerbaux, Cathy, additional, Paracho, Ana, additional, Boynard, Anne, additional, Hadji-Lazaro, Juliette, additional, Clarisse, Lieven, additional, Whitburn, Simon, additional, and Coheur, Pierre-Francois, additional

Published
2020
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94. Suporte de cabeça para cirurgia da coluna vertebral: nota técnica Soporte de cabeza para cirúgia de columna vertebral: nota técnica Head support for spinal surgery: technical note

Author

Guilherme Zanini Rocha, Aluízio Augusto Arantes Junior, José Guilherme Mendes de Oliveira, Fernando Flavio Vasconcelos Gonçalves, Julio César Boynard Santiago, and Sebastião Silva Gusmão

Subjects
Columna vertebral, Anestesia, Seguridad, Complicaciones, Posicionamiento del paciente, Posición prona, Coluna vertebral, Segurança, Complicações, Posicionamento do paciente, Decúbito ventral, Spine, Anesthesia, Safety, Complications, Patient positioning, Prone position, Orthopedic surgery, RD701-811, Diseases of the musculoskeletal system, RC925-935
Abstract

Descreve-se um suporte de cabeça para cirurgia da coluna vertebral, que permite a colocação da cabeça do paciente em alinhamento neutro com o corpo e monitorização da posição de olhos, boca, nariz e tubo orotraqueal, evitando danos decorrentes de mau posicionamento durante a cirurgia.Se describe un soporte de cabeza para la cirugía de columna vertebral que permite la colocación de la cabeza del paciente en alineación neutra con el cuerpo y el control de la posición de ojos, boca, nariz y tubo oro-traqueal, evitando los daños causados por el posicionamiento incorrecto durante la cirugía.We describe a head support for spinal surgery that allows the placement of the patient's head in neutral alignment with the body and monitoring the position of the eyes, mouth, nose and orotracheal tube, preventing damages from poor positioning during surgery.

Published
2012
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95. Total ozone loss during the 2018/19 Arctic winter and comparison toprevious years

Author

Goutail, Florence, Pommereau, Jean-Pierre, Pazmino, Andrea, Lefèvre, Franck, Clerbaux, Cathy, Boynard, Anne, Hadji-Lazaro, Juliette, Chipperfield, Martyn, Feng, Wuhu, Roozendael, Michel Van, Jepsen, Nis, Hansen, Georg, Kivi, Rigel, Bognar, Kristof, Strong, Kimberly, Walker, Kaley A., STRATO - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Sorbonne Université (SU)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS), TROPO - LATMOS, Institute for Climate and Atmospheric Science [Leeds] (ICAS), School of Earth and Environment [Leeds] (SEE), University of Leeds-University of Leeds, Belgian Institute for Space Aeronomy / Institut d'Aéronomie Spatiale de Belgique (BIRA-IASB), Danish Meteorological Institute (DMI), Norwegian Institute for Air Research (NILU), Finnish Meteorological Institute (FMI), Department of Physics [Toronto], University of Toronto, and Cardon, Catherine

Subjects
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, [SDU.OCEAN] Sciences of the Universe [physics]/Ocean, Atmosphere
Abstract

International audience; The amplitude of ozone depletion in the Arctic is monitored every year since 1994 by comparison between totalozone measurements of SAOZ / NDACC UV-Vis spectrometers deployed in the Arctic and 3-D chemical transportmodel simulations in which ozone is considered as a passive tracer.When SAOZ measurements are missing for various reasons, lack of sunlight, station closed or instrumentfailure, they are replaced by IASI Metop-A or IASI Metop-B overpasses above the station. These measurements inthe thermal Infrared are available all year around, at all latitudes even in the polar night. IASI data have been com-pared to SAOZ and to 3-D CTM REPROBUS and the agreement is better than 3% at the latitude of the polar circle.The method allows determining the evolution of the daily rate of the ozone destruction and the amplitudeof the cumulative loss at the end of the winter. The amplitude of the destruction varies between 0-10% in relativelywarm and short vortex duration years to 25-39% in colder and longer ones.However, as shown by the unprecedented depletion of 39% in 2010/11, the loss is not only dependent onthe extension of the vortex in spring, but also on its strength limiting its re-noxification by import of nitrogenoxide species from the outside, as reported by the rapid increase of total NO2columns measured by the SAOZinstruments.Shown in this presentation will be the evolution of ozone loss and re-noxification in the Arctic during thewinter 2018/19 compared to that of previous winters.Compared to observed SAOZ/IASI O3loss, REPROBUS and SLIMCAT CTM simulations are showingsimilar losses, however the agreement may vary from one year to the other, depending on the assumptions ofvortex strength and isolation. The comparison between ozone loss amplitudes and ozone loss rates, seen each yearsince 1994 by SAOZ and the two CTM simulations will be followed by a discussion of possible causes in theirvariable amplitude

Published
2019

96. Characterization of red blood cell aggregate formation using an analytical model of the ultrasonic backscattering coefficient

Author

Sennaoui, Abdelmalek, Boynard, Michel, and Pautou, Colette

Subjects
Erythrocytes -- Research, Backscattering -- Research, Diagnosis, Ultrasonic -- Research, Biological sciences, Business, Computers, Health care industry
Abstract

Ultrasound backscattering is well adapted to study the red blood cell (RBC) aggregation phenomenon and growth of RBC aggregates since the backscattered ultrasonic intensity depends on the sixth power of the mean radius of the scattering centers when considered as spherical. Thus, small variations of aggregate size induce large variations of the backscattered intensity. From measurements of the ultrasonic backscattering coefficient (ultrasonic backscattering cross section per unit volume of suspension), an analytical model describing its variation versus time, for human aggregated red blood cells in sedimentation, is proposed. Results given by the model allow to define three phases in the phenomenon: 1) a starting phase characterized by a duration [t.sub.s]; 2) a stationary final phase beginning at time [t.sub.f]; 3) a growing intermediate phase characterized by its duration [t.sub.f] - [t.sub.s]. The analytical model has been applied to describe RBC aggregation in dextran 70 000 dalton of different concentrations, and at various hematocrits. Knowledge of the durations [t.sub.s], [t.sub.f] and the maximum slope s of the curve during the intermediate phase, determined with the model, allows a means to study RBC aggregate growth. Index Terms - Analytical model, red blood cell aggregation, sedimentation, ultrasound backscattering.

Published
1997

97. Membrane modifications of red blood cells in Alzheimer's disease

Author

Sabolovic, Domagoj, Roudier, Michel, Boynard, Michel, Pautou, Colette, Sestier, Claude, Fertil, Bernard, Geldwerth, Danielle, Roger, Jacky, Pons, Jean-Noel, Amri, Asmina, and Halbreich, Avraham

Subjects
Alzheimer's disease -- Research, Erythrocytes -- Aging, Health, Seniors
Published
1997

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