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4 results on '"Collard, Fabrice"'

1. On Surface Waves Generated by Extra-Tropical Cyclones—Part II: Simulations.

Author

Cheshm Siyahi, Vahid, Kudryavtsev, Vladimir, Yurovskaya, Maria, Collard, Fabrice, and Chapron, Bertrand

Subjects
OCEAN waves, AIR jets, SPATIOTEMPORAL processes, EXTREME value theory, ROGUE waves, CYCLONES, WIND waves
Abstract

In the previous companion study, satellite data were used to describe peculiar characteristics of ocean surface wave fields, generated by two extra-tropical cyclones (ETCs) rapidly propagating in the North Atlantic. Based on a 2D parametric wave model, further details are now provided to analyse and interpret the spatio-temporal evolution of very intense ETC-generated waves. Significant wave height and wavelength values are shown to reach extreme values, 18 m and 500 m, respectively. Resulting energetic swell systems waves then radiate in the whole eastern part of the North Atlantic, and more particularly in the Norwegian sea region. Moving to higher latitudes, wind forcing characteristics of ETCs evolve, with the shape of the wind field changing from quasi-cyclonic to "air jets/Icelandic lows". In this paper, the resulting swell generation and propagation, after the deformation of an individual ETC, were studied, as well. Confirmed with comparisons with multi-satellite observations, the application of the parametric-2D wave-ray model was demonstrated to provide robust and highly detailed information on wave generation under very complex wind regime changes. [ABSTRACT FROM AUTHOR]

Published
2023
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2. Surface Wave Developments under Tropical Cyclone Goni (2020): Multi-Satellite Observations and Parametric Model Comparisons.

Author

Yurovskaya, Maria, Kudryavtsev, Vladimir, Mironov, Alexey, Mouche, Alexis, Collard, Fabrice, and Chapron, Bertrand

Subjects
TROPICAL cyclones, PARAMETRIC modeling, WAVE amplification, ROGUE waves, OCEAN waves, GROUP velocity, WIND speed
Abstract

Simple Summary: Multi-satellite observations to jointly analyze extreme surface wind and wave properties can now be readily obtained to study tropical cyclone (TC) events. Developing over the Philippine Sea, TC Goni was one of the most powerful TCs in 2020. Constrained by Sentinel-1/RadarSat-2 SAR and CFOSAT SCAT satellite data, wind field in the intense TC region is reconstructed. Significant wave height measurements are further obtained from altimeters on-board the CFOSAT, Jason-3, and Sentinel-3A, B satellites. The directional wave spectrum information can be derived from the CFOSAT SWIM off-nadir radar measurements. Using a simplified 2D parametric model and derived self-similar analytical solutions, the measured surface wave amplification in the right-hand TC sector, relative to its propagation direction, is well captured and interpreted. For TC Goni, observed and predicted waves reach 8 m and wavelengths larger than 200 m, leaving the TC inner region in the forward and forward-left direction. In the far TC zone, swell attenuates and superposes with wind waves, not necessarily aligned, to give observed significant wave height values. Multi-satellite data together with simplified parametric model outputs open new perspectives to more precisely study and predict surface waves generated by moving and rapidly evolving TCs for different scientific and practical purposes. Over the Philippine Sea, the tropical cyclone (TC) Goni reaches category 5 on 29–31 October 2020. Multi-satellite observations, including CFOSAT SWIM/SCAT and Sentinel-1 SAR data, are jointly analyzed to assess the performances of a parametric model. Recently developed to provide a fast estimation of surface wave developments under rapidly evolving TCs, this full 2D parametric model (KYCM) and its simplified self-similar solutions (TC-wave geophysical model function (TCW GMF)) are thoroughly compared with satellite observations. TCW GMF provides immediate first-guess estimates, at any location in space and time, for the significant wave height, wavelength, and wave direction parameters. Moving cyclones trigger strong asymmetrical wave fields, associated to a resonance between wave group velocity and TC heading velocity. For TC Goni, this effect is well evidenced and captured, leading to extreme waves reaching up to 8 m, further outrunning as swell systems with wavelengths about 200–250 m in the TC heading direction, slightly shifted leftwards. Considering wind field constrained with very highly resolved Sentinel-1 SAR measurements and medium resolution CFOSAT SCAT data, quantitative agreements between satellite measurements and KYCM/TCW GMF results are obtained. Far from the TC inner core (∼10 radii of maximum wind speed), the superposition of outrunning swell systems and local wind waves estimates leads to Hs values very close to altimeter measurements. This case study demonstrates the promising capabilities to combine multi-satellite observations, with analytical self-similar solutions to advance improved understandings of surface wave generation under extreme wind conditions. [ABSTRACT FROM AUTHOR]

Published
2022
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3. SKIM, a Candidate Satellite Mission Exploring Global Ocean Currents and Waves

Author

Ardhuin, Fabrice, Brandt, Peter, Gaultier, Lucile, Donlon, Craig, Battaglia, Alessandro, Boy, Francois, Casal, Tania, Chapron, Bertrand, Collard, Fabrice, Cravatte, Sophie, Delouis, Jean-Marc, De Witte, Erik, Dibarboure, Gerald, Engen, Geir, Johnsen, Harald, Lique, Camille, Lopez-Dekker, Paco, Maes, Christophe, Martin, Adrien, Marie, Louis, Menemenlis, Dimitris, Nouguier, Frederic, Peureux, Charles, Rampal, Pierre, Ressler, Gerhard, Rio, Marie-Helene, Rommen, Bjorn, Shutler, Jamie D., Suess, Martin, Tsamados, Michel, Ubelmann, Clement, van Sebille, Erik, van den Oever, Martin, Stammer, Detlef, Sub Physical Oceanography, Marine and Atmospheric Research, Sub Physical Oceanography, Marine and Atmospheric Research, Laboratoire d'Océanographie Physique et Spatiale (LOPS), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS), OceanDataLab, European Space Research and Technology Centre (ESTEC), Agence Spatiale Européenne = European Space Agency (ESA), Centre National d'Études Spatiales [Toulouse] (CNES), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Institut de Recherche pour le Développement (IRD), Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Université de Toulouse (UT)-Université de Toulouse (UT)-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), National Oceanography Centre [Southampton] (NOC), University of Southampton, Centre for Polar Observation & Modelling, University College of London [London] (UCL), Jet Propulsion Laboratory (JPL), NASA-California Institute of Technology (CALTECH), Grantham Institute for Climate Change and the Environment, Imperial College London, ISBlue - Interdisciplinary Graduate School for the Blue planet (2017), ANR-17-EURE-0015,ISBlue,Interdisciplinary Graduate School for the Blue planet(2017), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS), ODL - OceanDataLab, European Space Agency (ESA), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), and Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)

Subjects
0106 biological sciences, lcsh:QH1-199.5, 010504 meteorology & atmospheric sciences, BUDGET, Oceanography, 01 natural sciences, 7. Clean energy, remote sensing, Arctic, ocean waves, altimetry, Wind wave, SPACE, WATER, Marine & Freshwater Biology, lcsh:Science, Delta-k interferometry, Physics::Atmospheric and Oceanic Physics, Water Science and Technology, Global and Planetary Change, Doppler centroid, IN-SITU, ocean current, Doppler, SEA-SURFACE KINEMATICS, Life Sciences & Biomedicine, Meteorology, CIRCULATION, Ocean Engineering, VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Oseanografi: 452, Environmental Sciences & Ecology, Sea state, lcsh:General. Including nature conservation, geographical distribution, Aquatic Science, tropics, Altimetry, Ocean current, Radar, Remote sensing, VDP::Mathematics and natural science: 400::Geosciences: 450::Oceanography: 452, 14. Life underwater, Altimeter, Rogue wave, Sea ice concentration, 0105 earth and related environmental sciences, [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], Science & Technology, 010604 marine biology & hydrobiology, Scatterometer, VELOCITY, TRANSPORT, Boundary current, MODEL, 13. Climate action, MIXED-LAYER HEAT, Environmental science, lcsh:Q, sea state, Environmental Sciences
Abstract

The Sea surface KInematics Multiscale monitoring (SKIM) satellite mission is designed to explore ocean surface current and waves. This includes tropical currents, notably the poorly known patterns of divergence and their impact on the ocean heat budget, and monitoring of the emerging Arctic up to 82.5°N. SKIM will also make unprecedented direct measurements of strong currents, from boundary currents to the Antarctic circumpolar current, and their interaction with ocean waves with expected impacts on air-sea fluxes and extreme waves. For the first time, SKIM will directly measure the ocean surface current vector from space. The main instrument on SKIM is a Ka-band conically scanning, multi-beam Doppler radar altimeter/wave scatterometer that includes a state-of-the-art nadir beam comparable to the Poseidon-4 instrument on Sentinel 6. The well proven Doppler pulse-pair technique will give a surface drift velocity representative of the top meter of the ocean, after subtracting a large wave-induced contribution. Horizontal velocity components will be obtained with an accuracy better than 7 cm/s for horizontal wavelengths larger than 80 km and time resolutions larger than 15 days, with a mean revisit time of 4 days for of 99% of the global oceans. This will provide unique and innovative measurements that will further our understanding of the transports in the upper ocean layer, permanently distributing heat, carbon, plankton, and plastics. SKIM will also benefit from co-located measurements of water vapor, rain rate, sea ice concentration, and wind vectors provided by the European operational satellite MetOp-SG(B), allowing many joint analyses. SKIM is one of the two candidate satellite missions under development for ESA Earth Explorer 9. The other candidate is the Far infrared Radiation Understanding and Monitoring (FORUM). The final selection will be announced by September 2019, for a launch in the coming decade. Copyright © 2019 Ardhuin, Brandt, Gaultier, Donlon, Battaglia, Boy, Casal, Chapron, Collard, Cravatte, Delouis, De Witte, Dibarboure, Engen, Johnsen, Lique, Lopez-Dekker, Maes, Martin, Marié, Menemenlis, Nouguier, Peureux, Rampal, Ressler, Rio, Rommen, Shutler, Suess, Tsamados, Ubelmann, van Sebille, van den Oever and Stammer. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY).

Published
2019

4. Measuring currents, ice drift, and waves from space: the Sea Surface KInematics Multiscale monitoring (SKIM) concept

Author

Ardhuin, Fabrice, Aksenov, Yevgueny, Benetazzo, Alvise, Bertino, Laurent, Brandt, Peter, Caubet, Eric, Chapron, Bertrand, Collard, Fabrice, Cravatte, Sophie, Delouis, Jean-Marc, Dias, Frederic, Dibarboure, Gerald, Gaultier, Lucile, Johannessen, Johnny A., Korosov, Anton, Manucharyan, Georgy, Menemenlis, Dimitris, Menendez, Melisa, Monnier, Goulven, Mouche, Alexis, Nouguier, Frederic, Nurser, George, Rampal, Pierre, Reniers, Ad, Rodriguez, Ernesto, Stopa, Justin, Tison, Celine, Ubelmann, Clement, van Sebille, Erik, Xie, Jiping, Sub Physical Oceanography, Marine and Atmospheric Research, Universidad de Cantabria, Laboratoire d'Océanographie Physique et Spatiale (LOPS), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS), OceanDataLab, Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS), 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)-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), Centre National d'Études Spatiales [Toulouse] (CNES), Nansen Environmental and Remote Sensing Center [Bergen] (NERSC), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Université de Toulouse (UT)-Université de Toulouse (UT)-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), Sub Physical Oceanography, and Marine and Atmospheric Research

Subjects
010504 meteorology & atmospheric sciences, Doppler radar, 0211 other engineering and technologies, Mesoscale meteorology, 02 engineering and technology, 01 natural sciences, law.invention, Physics::Geophysics, law, Wind wave, Nadir, 14. Life underwater, Altimeter, DATA ASSIMILATION SYSTEM, IN-SITU DATA, GRAVITY-WAVES, OCEAN, RADAR, RESOLUTION, ALTIMETER, MESOSCALE, VELOCITY, TOPAZ4, lcsh:Environmental sciences, [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography, Physics::Atmospheric and Oceanic Physics, 021101 geological & geomatics engineering, 0105 earth and related environmental sciences, Remote sensing, lcsh:GE1-350, Ocean current, lcsh:Geography. Anthropology. Recreation, lcsh:G, 13. Climate action, Sea ice thickness, Satellite, Geology
Abstract

We propose a satellite mission that uses a near-nadir Ka-band Doppler radar to measure surface currents, ice drift and ocean waves at spatial scales of 40 km and more, with snapshots at least every day for latitudes 75 to 82°, and every few days for other latitudes. The use of incidence angles of 6 and 12° allows for measurement of the directional wave spectrum, which yields accurate corrections of the wave-induced bias in the current measurements. The instrument's design, an algorithm for current vector retrieval and the expected mission performance are presented here. The instrument proposed can reveal features of tropical ocean and marginal ice zone (MIZ) dynamics that are inaccessible to other measurement systems, and providing global monitoring of the ocean mesoscale that surpasses the capability of today's nadir altimeters. Measuring ocean wave properties has many applications, including examining wave–current interactions, air–sea fluxes, the transport and convergence of marine plastic debris and assessment of marine and coastal hazards.

Published
2018

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