Search

Your search keyword '"Ohkawara, Nozomu"' showing total 22 results
Start Over Author "Ohkawara, Nozomu"
22 results on '"Ohkawara, Nozomu"'

2. Extending the calibration traceability of longwave radiation time-series (ExTrac)

Author

Nyeki, Stephan, Grobner, Julian, Vuilleumier, Laurent, Lanconelli, Christian, Driemel, Amelie, Knap, Wouter, Maturilli, Marion, Ohkawara, Nozomu, Riihimaki, Laura, Schmithlisen, Holger, Nyeki, Stephan, Grobner, Julian, Vuilleumier, Laurent, Lanconelli, Christian, Driemel, Amelie, Knap, Wouter, Maturilli, Marion, Ohkawara, Nozomu, Riihimaki, Laura, and Schmithlisen, Holger

Published
2024

6. Optimal use of the Prede POM sky radiometer for aerosol, water vapor, and ozone retrievals

Author

Kudo, Rei, primary, Diémoz, Henri, additional, Estellés, Victor, additional, Campanelli, Monica, additional, Momoi, Masahiro, additional, Marenco, Franco, additional, Ryder, Claire L., additional, Ijima, Osamu, additional, Uchiyama, Akihiro, additional, Nakashima, Kouichi, additional, Yamazaki, Akihiro, additional, Nagasawa, Ryoji, additional, Ohkawara, Nozomu, additional, and Ishida, Haruma, additional

Published
2021
Full Text
View/download PDF

7. Optimal use of Prede POM sky radiometer for aerosol, water vapor, and ozone retrievals

Author

Kudo, Rei, primary, Diémoz, Henri, additional, Estellés, Victor, additional, Campanelli, Monica, additional, Momoi, Masahiro, additional, Marenco, Franco, additional, Ryder, Claire L., additional, Ijima, Osamu, additional, Uchiyama, Akihiro, additional, Nakashima, Kouichi, additional, Yamazaki, Akihiro, additional, Nagasawa, Ryoji, additional, Ohkawara, Nozomu, additional, and Ishida, Haruma, additional

Published
2020
Full Text
View/download PDF

8. Supplementary material to "Optimal use of Prede POM sky radiometer for aerosol, water vapor, and ozone retrievals"

Author

Kudo, Rei, primary, Diémoz, Henri, additional, Estellés, Victor, additional, Campanelli, Monica, additional, Momoi, Masahiro, additional, Marenco, Franco, additional, Ryder, Claire L., additional, Ijima, Osamu, additional, Uchiyama, Akihiro, additional, Nakashima, Kouichi, additional, Yamazaki, Akihiro, additional, Nagasawa, Ryoji, additional, Ohkawara, Nozomu, additional, and Ishida, Haruma, additional

Published
2020
Full Text
View/download PDF

9. Results from the Fourth WMO Filter Radiometer Comparison for aerosol optical depth measurements

Author

Kazadzis, Stelios, Kouremeti, Natalia, Diémoz, Henri, Gröbner, Julian, Forgan, Bruce W., Campanelli, Monica, Estellés, Victor, Lantz, Kathleen, Michalsky, Joseph, Carlund, Thomas, Cuevas, Emilio, Toledano, Carlos, Becker, Ralf, Nyeki, Stephan, Kosmopoulos, Panagiotis G., Tatsiankou, Viktar, Vuilleumier, Laurent, Denn, Frederick M., Ohkawara, Nozomu, Ijima, Osamu, Goloub, Philippe, Raptis, Panagiotis I., Milner, Michael, Behrens, Klaus, Barreto, Africa, Martucci, Giovanni, Hall, Emiel, Wendell, James, Fabbri, Bryan E., Wehrli, Christoph, Laboratoire d’Optique Atmosphérique - UMR 8518 (LOA), and Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)

Subjects
Earth's energy budget, Termodinàmica atmosfèrica, Atmospheric Science, Angstrom exponent, 010504 meteorology & atmospheric sciences, Meteorologi och atmosfärforskning, 01 natural sciences, Aerosol optical depth, lcsh:Chemistry, 010309 optics, symbols.namesake, Aerosol networks, 0103 physical sciences, Rayleigh scattering, radiometry field campaign, Radiation balance, 0105 earth and related environmental sciences, Remote sensing, Aerosols, Radiometer, lcsh:QC1-999, Aerosol, Spectroradiometer, lcsh:QD1-999, 13. Climate action, [SDU]Sciences of the Universe [physics], Meteorology and Atmospheric Sciences, symbols, Environmental science, Sun photometers, lcsh:Physics, Water vapor
Abstract

This study presents the results of the Fourth Filter Radiometer Comparison that was held in Davos, Switzerland, between 28 September and 16 October 2015. Thirty filter radiometers and spectroradiometers from 12 countries participated including reference instruments from global aerosol networks. The absolute differences of all instruments compared to the reference have been based on the World Meteorological Organization (WMO) criterion defined as follows: 95% of the measured data has to be within 0.005 ± 0.001∕m (where m is the air mass). At least 24 out of 29 instruments achieved this goal at both 500 and 865 nm, while 12 out of 17 and 13 out of 21 achieved this at 368 and 412 nm, respectively. While searching for sources of differences among different instruments, it was found that all individual differences linked to Rayleigh, NO2, ozone, water vapor calculations and related optical depths and air mass calculations were smaller than 0.01 in aerosol optical depth (AOD) at 500 and 865 nm. Different cloud-detecting algorithms used have been compared. Ångström exponent calculations showed relatively large differences among different instruments, partly because of the high calculation uncertainty of this parameter in low AOD conditions. The overall low deviations of these AOD results and the high accuracy of reference aerosol network instruments demonstrated a promising framework to achieve homogeneity, compatibility and harmonization among the different spectral AOD networks in the near future.

Published
2018
Full Text
View/download PDF

10. Validation of 10-year 1 SAO OMI ozone profile (PROFOZ) product using ozonesonde observations

Author

Huang, Guanyu, Xiong, Liu, Chance, Kelly, Yang, Kai, Bhartia, Pawan K., Cai, Zhaonan, Allaart, Marc, Calpini, Bertrand, Coetzee, Gerrie J. R., Cuevas Agulló, Emilio, Cupeiro, Manuel, Backer, Hugo de, Dubey, Manvendra K., Fuelberg, Henry E., Fujiwara, Masatomo, Godin-Beekmann, Sophie, Hall, Tristan J., Johnson, Bryan, Joseph, Everette, Kivi, Rigel, Kois, Bogumil, Komala, Ninong, König-Langlo, Gert, Laneve, Giovanni, Leblanc, Thierry, Marchand, Marion, Minschwaner, Kenneth R., Morris, Gary, Newchurch, Michael J., Ogino, Shin-Ya, Ohkawara, Nozomu, Piters, Ankie J. M., Posny, Françoise, Querel, Richard, Scheel, Rinus, Schmidlin, Frank J., Schnell, Russell, C., Schrems, Otto, Henry Selkirk, Henry, Shiotani, Masato, Skrivánková, Pavla, Stübi, Rene, Taha, Ghassan, Tarasick, David W., Thompson, Anne M., Thouret, Valerie, Tully, Matt, Malderen, Roeland van, Vaughan, Geraint, Vömel, Holger, Gathen, Peter von der, Witte, Jacquelyn C., and Yela, Margarita

Subjects
Aerosols, Ozonesonde observations, Trace gases, Ozone monitoring instrument, Gases traza, Aerosoles, Monitoreo del ozono, Observaciones de ozonosondeos
Abstract

It is essential to understand the data quality of +10-year OMI ozone product and impacts of the “row anomaly” (RA). We validate the OMI Ozone Profile (PROFOZ) product from Oct 2004 to Dec 2014 against ozonesonde observations globally. Generally, OMI has good agreement with ozonesondes. The spatiotemporal variation of retrieval performance suggests the need to improve OMI’s radiometric calibration especially during the post-RA period to maintain the long-term stability.

Published
2017

11. Validation of 10-year 1 SAO OMI ozone profile (PROFOZ) product using ozonesonde observations [Discussion paper]

Author

Huang, Guanyu, Xiong, Liu, Chance, Kelly, Yang, Kai, Bhartia, Pawan K., Cai, Zhaonan, Allaart, Marc, Calpini, Bertrand, Coetzee, Gerrie J. R., Cuevas Agulló, Emilio, Cupeiro, Manuel, Backer, Hugo de, Dubey, Manvendra K., Fuelberg, Henry E., Fujiwara, Masatomo, Godin-Beekmann, Sophie, Hall, Tristan J., Johnson, Bryan, Joseph, Everette, Kivi, Rigel, Kois, Bogumil, Komala, Ninong, König-Langlo, Gert, Laneve, Giovanni, Leblanc, Thierry, Marchand, Marion, Minschwaner, Kenneth R., Morris, Gary, Newchurch, Michael J., Ogino, Shin-Ya, Ohkawara, Nozomu, Piters, Ankie J. M., Posny, Françoise, Querel, Richard, Scheel, Rinus, Schmidlin, Frank J., Schnell, Russell, C., Schrems, Otto, Henry Selkirk, Henry, Shiotani, Masato, Skrivánková, Pavla, Stübi, Rene, Taha, Ghassan, Tarasick, David W., Thompson, Anne M., Thouret, Valerie, Tully, Matt, Van Malderen, Roeland, Vaughan, Geraint, Vömel, Holger, Gathen, Peter von der, Witte, Jacquelyn C., and Yela, Margarita

Subjects
Aerosols, Ozonesonde observations, Trace gases, Ozone monitoring instrument, Gases traza, Aerosoles, Monitoreo del ozono, Observaciones de ozonosondeos
Abstract

It is essential to understand the data quality of 10+ year OMI ozone product and impacts of the “Row Anomaly (RA)”. We validate the OMI ozone-profile (PROFOZ) product from Oct. 2004 to Dec. 2014 against ozonesonde observations globally. Generally, OMI has good agreement with ozonesondes. The spatiotemporal variation of retrieval performance suggests the need to improve OMI’s radiometric calibration especially during the post-RA period to maintain the long-term stability.

Published
2017

12. Results from the 4th WMO Filter Radiometer Comparison for aerosol optical depth measurements

Author

Kazadzis, Stelios, primary, Kouremeti, Natalia, additional, Diémoz, Henri, additional, Gröbner, Julian, additional, Forgan, Bruce W., additional, Campanelli, Monica, additional, Estellés, Victor, additional, Lantz, Kathleen, additional, Michalsky, Joseph, additional, Carlund, Thomas, additional, Cuevas, Emilio, additional, Toledano, Carlos, additional, Becker, Ralf, additional, Nyeki, Stephan, additional, Kosmopoulos, Panagiotis G., additional, Tatsiankou, Viktar, additional, Vuilleumier, Laurent, additional, Denn, Frederick M., additional, Ohkawara, Nozomu, additional, Ijima, Osamu, additional, Goloub, Philippe, additional, Raptis, Panagiotis I., additional, Milner, Michael, additional, Behrens, Klaus, additional, Barreto, Africa, additional, Martucci, Giovanni, additional, Hall, Emiel, additional, Wendell, James, additional, Fabbri, Bryan E., additional, and Wehrli, Christoph, additional

Published
2017
Full Text
View/download PDF

13. Supplementary material to "Results from the 4th WMO Filter Radiometer Comparison for aerosol optical depth measurements"

Author

Kazadzis, Stelios, primary, Kouremeti, Natalia, additional, Diémoz, Henri, additional, Gröbner, Julian, additional, Forgan, Bruce W., additional, Campanelli, Monica, additional, Estellés, Victor, additional, Lantz, Kathleen, additional, Michalsky, Joseph, additional, Carlund, Thomas, additional, Cuevas, Emilio, additional, Toledano, Carlos, additional, Becker, Ralf, additional, Nyeki, Stephan, additional, Kosmopoulos, Panagiotis G., additional, Tatsiankou, Viktar, additional, Vuilleumier, Laurent, additional, Denn, Frederick M., additional, Ohkawara, Nozomu, additional, Ijima, Osamu, additional, Goloub, Philippe, additional, Raptis, Panagiotis I., additional, Milner, Michael, additional, Behrens, Klaus, additional, Barreto, Africa, additional, Martucci, Giovanni, additional, Hall, Emiel, additional, Wendell, James, additional, Fabbri, Bryan E., additional, and Wehrli, Christoph, additional

Published
2017
Full Text
View/download PDF

14. Validation of 10-year SAO OMI Ozone Profile (PROFOZ) product using ozonesonde observations

Author

50192604, Huang, Guanyu, Liu, Xiong, Chance, Kelly, Yang, Kai, Bhartia, Pawan K., Cai, Zhaonan, Allaart, Marc, Ancellet, Gérard, Calpini, Bertrand, Coetzee, Gerrie J. R., Cuevas-Agulló, Emilio, Cupeiro, Manuel, De Backer, Hugo, Dubey, Manvendra K., Fuelberg, Henry E., Fujiwara, Masatomo, Godin-Beekmann, Sophie, Hall, Tristan J., Johnson, Bryan, Joseph, Everette, Kivi, Rigel, Kois, Bogumil, Komala, Ninong, König-Langlo, Gert, Laneve, Giovanni, Leblanc, Thierry, Marchand, Marion, Minschwaner, Kenneth R., Morris, Gary, Newchurch, Michael J., Ogino, Shin-Ya, Ohkawara, Nozomu, Piters, Ankie J. M., Posny, Françoise, Querel, Richard, Scheele, Rinus, Schmidlin, Frank J., Schnell, Russell C., Schrems, Otto, Selkirk, Henry, Shiotani, Masato, Skrivánková, Pavla, Stübi, René, Taha, Ghassan, Tarasick, David W., Thompson, Anne M., Thouret, Valérie, Tully, Matthew B., Van Malderen, Roeland, Vömel, Holger, von der Gathen, Peter, Witte, Jacquelyn C., Yela, Margarita, 50192604, Huang, Guanyu, Liu, Xiong, Chance, Kelly, Yang, Kai, Bhartia, Pawan K., Cai, Zhaonan, Allaart, Marc, Ancellet, Gérard, Calpini, Bertrand, Coetzee, Gerrie J. R., Cuevas-Agulló, Emilio, Cupeiro, Manuel, De Backer, Hugo, Dubey, Manvendra K., Fuelberg, Henry E., Fujiwara, Masatomo, Godin-Beekmann, Sophie, Hall, Tristan J., Johnson, Bryan, Joseph, Everette, Kivi, Rigel, Kois, Bogumil, Komala, Ninong, König-Langlo, Gert, Laneve, Giovanni, Leblanc, Thierry, Marchand, Marion, Minschwaner, Kenneth R., Morris, Gary, Newchurch, Michael J., Ogino, Shin-Ya, Ohkawara, Nozomu, Piters, Ankie J. M., Posny, Françoise, Querel, Richard, Scheele, Rinus, Schmidlin, Frank J., Schnell, Russell C., Schrems, Otto, Selkirk, Henry, Shiotani, Masato, Skrivánková, Pavla, Stübi, René, Taha, Ghassan, Tarasick, David W., Thompson, Anne M., Thouret, Valérie, Tully, Matthew B., Van Malderen, Roeland, Vömel, Holger, von der Gathen, Peter, Witte, Jacquelyn C., and Yela, Margarita

Abstract

We validate the Ozone Monitoring Instrument (OMI) Ozone Profile (PROFOZ) product from October 2004 through December 2014 retrieved by the Smithsonian Astrophysical Observatory (SAO) algorithm against ozonesonde observations. We also evaluate the effects of OMI row anomaly (RA) on the retrieval by dividing the dataset into before and after the occurrence of serious OMI RA, i.e., pre-RA (2004–2008) and post-RA (2009–2014). The retrieval shows good agreement with ozonesondes in the tropics and midlatitudes and for pressure < ∼ 50 hPa in the high latitudes. It demonstrates clear improvement over the a priori down to the lower troposphere in the tropics and down to an average of ∼ 550 (300) hPa at middle (high) latitudes. In the tropics and midlatitudes, the profile mean biases (MBs) are less than 6 %, and the standard deviations (SDs) range from 5 to 10 % for pressure < ∼ 50 hPa to less than 18 % (27 %) in the tropics (midlatitudes) for pressure > ∼ 50 hPa after applying OMI averaging kernels to ozonesonde data. The MBs of the stratospheric ozone column (SOC, the ozone column from the tropopause pressure to the ozonesonde burst pressure) are within 2 % with SDs of < 5 % and the MBs of the tropospheric ozone column (TOC) are within 6 % with SDs of 15 %. In the high latitudes, the profile MBs are within 10 % with SDs of 5–15 % for pressure < ∼ 50 hPa but increase to 30 % with SDs as great as 40 % for pressure > ∼ 50 hPa. The SOC MBs increase up to 3 % with SDs as great as 6 % and the TOC SDs increase up to 30 %. The comparison generally degrades at larger solar zenith angles (SZA) due to weaker signals and additional sources of error, leading to worse performance at high latitudes and during the midlatitude winter. Agreement also degrades with increasing cloudiness for pressure > ∼ 100 hPa and varies with cross-track position, especially with large MBs and SDs at extreme off-nadir positions. In the tropics and midlatitudes, the post-RA comparison is considerably wo

Published
2017

15. Validation of 10-year SAO OMI Ozone Profile (PROFOZ) Product Using Ozonesonde Observations

Author

Huang, Guanyu, Liu, Xiong, Chance, Kelly, Yang, Kai, Bhartia, Pawan K., Cai, Zhaonan, Allaart, Marc, Calpini, Bertrand, Coetzee, Gerrie J. R., Cuevas-Agulló, Emilio, Cupeiro, Manuel, De Backer, Hugo, Dubey, Manvendra K., Fuelberg, Henry E., Fujiwara, Masatomo, Godin-Beekmann, Sophie, Hall, Tristan J., Johnson, Bryan, Joseph, Everette, Kivi, Rigel, Kois, Bogumil, Komala, Ninong, König-Langlo, Gert, Laneve, Giovanni, Leblanc, Thierry, Marchand, Marion, Minschwaner, Kenneth R., Morris, Gary, Newchurch, Mike J., Ogino, Shin-Ya, Ohkawara, Nozomu, Piters, Ankie J. M., Posny, Françoise, Querel, Richard, Scheele, Rinus, Schmidlin, Frank J., Schnell, Russell C., Schrems, Otto, Selkirk, Henry, Shiotani, Masato, Skrivánková, Pavla, Stübi, René, Taha, Ghassan, Tarasick, David W., Thompson, Anne M., Thouret, Valérie, Tully, Matt, van Malderen, Roeland, Vaughan, Geraint, Vömel, Holger, von der Gathen, Peter, Witte, Jacquelyn C., Yela, Margarita, Huang, Guanyu, Liu, Xiong, Chance, Kelly, Yang, Kai, Bhartia, Pawan K., Cai, Zhaonan, Allaart, Marc, Calpini, Bertrand, Coetzee, Gerrie J. R., Cuevas-Agulló, Emilio, Cupeiro, Manuel, De Backer, Hugo, Dubey, Manvendra K., Fuelberg, Henry E., Fujiwara, Masatomo, Godin-Beekmann, Sophie, Hall, Tristan J., Johnson, Bryan, Joseph, Everette, Kivi, Rigel, Kois, Bogumil, Komala, Ninong, König-Langlo, Gert, Laneve, Giovanni, Leblanc, Thierry, Marchand, Marion, Minschwaner, Kenneth R., Morris, Gary, Newchurch, Mike J., Ogino, Shin-Ya, Ohkawara, Nozomu, Piters, Ankie J. M., Posny, Françoise, Querel, Richard, Scheele, Rinus, Schmidlin, Frank J., Schnell, Russell C., Schrems, Otto, Selkirk, Henry, Shiotani, Masato, Skrivánková, Pavla, Stübi, René, Taha, Ghassan, Tarasick, David W., Thompson, Anne M., Thouret, Valérie, Tully, Matt, van Malderen, Roeland, Vaughan, Geraint, Vömel, Holger, von der Gathen, Peter, Witte, Jacquelyn C., and Yela, Margarita

Abstract

We validate the Ozone Monitoring Instrument (OMI) ozone-profile (PROFOZ) product from October 2004 through December 2014 retrieved by the Smithsonian Astrophysical Observatory (SAO) algorithm against ozonesonde observations. We also evaluate the effects of OMI Row anomaly (RA) on the retrieval by dividing the data set into before and after the occurrence of serious OMI RA, i.e., pre-RA (2004–2008) and post-RA (2009–2014). The retrieval shows good agreement with ozonesondes in the tropics and mid-latitudes and for pressure < ~ 50 hPa in the high latitudes. It demonstrates clear improvement over the a priori down to the lower troposphere in the tropics and down to an average of ~ 550 (300) hPa at middle (high latitudes). In the tropics and mid-latitudes, the profile mean biases (MBs) are less than 6 %, and the standard deviations (SDs) range from 5–10 % for pressure < ~ 50 hPa to less than 18 % (27 %) in the tropics (mid-latitudes) for pressure > ~ 50 hPa after applying OMI averaging kernels to ozonesonde data. The MBs of the stratospheric ozone column (SOC) are within 2 % with SDs of < 5 % and the MBs of the tropospheric ozone column (TOC) are within 6 % with SDs of 15 %. In the high latitudes, the profile MBs are within 10 % with SDs of 5–15 % for pressure < ~ 50 hPa, but increase to 30 % with SDs as great as 40 % for pressure > ~ 50 hPa. The SOC MBs increase up to 3 % with SDs as great as 6 % and the TOC SDs increase up to 30 %. The comparison generally degrades at larger solar-zenith angles (SZA) due to weaker signals and additional sources of error, leading to worse performance at high latitudes and during the mid-latitude winter. Agreement also degrades with increasing cloudiness for pressure > ~ 100 hPa and varies with cross-track position, especially with large MBs and SDs at extreme off-nadir positions. In the tropics and mid-latitudes, the post-RA comparison is considerably worse with larger SDs reaching 2 % in the stratosphere and 8 % in the troposphere and

Published
2017

16. Validation of 10-year SAO OMI Ozone Profile (PROFOZ) product using ozonesonde observations

Author

Huang, Guanyu, primary, Liu, Xiong, additional, Chance, Kelly, additional, Yang, Kai, additional, Bhartia, Pawan K., additional, Cai, Zhaonan, additional, Allaart, Marc, additional, Ancellet, Gérard, additional, Calpini, Bertrand, additional, Coetzee, Gerrie J. R., additional, Cuevas-Agulló, Emilio, additional, Cupeiro, Manuel, additional, De Backer, Hugo, additional, Dubey, Manvendra K., additional, Fuelberg, Henry E., additional, Fujiwara, Masatomo, additional, Godin-Beekmann, Sophie, additional, Hall, Tristan J., additional, Johnson, Bryan, additional, Joseph, Everette, additional, Kivi, Rigel, additional, Kois, Bogumil, additional, Komala, Ninong, additional, König-Langlo, Gert, additional, Laneve, Giovanni, additional, Leblanc, Thierry, additional, Marchand, Marion, additional, Minschwaner, Kenneth R., additional, Morris, Gary, additional, Newchurch, Michael J., additional, Ogino, Shin-Ya, additional, Ohkawara, Nozomu, additional, Piters, Ankie J. M., additional, Posny, Françoise, additional, Querel, Richard, additional, Scheele, Rinus, additional, Schmidlin, Frank J., additional, Schnell, Russell C., additional, Schrems, Otto, additional, Selkirk, Henry, additional, Shiotani, Masato, additional, Skrivánková, Pavla, additional, Stübi, René, additional, Taha, Ghassan, additional, Tarasick, David W., additional, Thompson, Anne M., additional, Thouret, Valérie, additional, Tully, Matthew B., additional, Van Malderen, Roeland, additional, Vömel, Holger, additional, von der Gathen, Peter, additional, Witte, Jacquelyn C., additional, and Yela, Margarita, additional

Published
2017
Full Text
View/download PDF

18. Is global dimming and brightening in Japan limited to urban areas?

Author

Katsumasa Tanaka, Atsumu Ohmura, Folini, Doris, Wild, Martin, and Ohkawara, Nozomu

Abstract

Observations worldwide indicate secular trends of all-sky surface solar radiation on decadal time scale, termed global dimming and brightening. Accordingly, the observed surface radiation in Japan generally shows a strong decline till the end of the 1980s and then a recovery toward around 2000. Because a substantial number of measurement stations are located within or proximate to populated areas, one may speculate that the observed trends are strongly influenced by local air pollution and are thus not of large-scale significance. This hypothesis poses a serious question as to what regional extent the global dimming and brightening are significant: Are the global dimming and brightening truly global phenomena, or regional or even only local? Our study focused on 14 meteorological observatories that measured all-sky surface solar radiation, zenith transmittance, and maximum transmittance. On the basis of municipality population time series, historical land use maps, recent satellite images, and actual site visits, we concluded that eight stations had been significantly influenced by urbanization, with the remaining six stations being left pristine. Between the urban and rural areas, no marked differences were identified in the temporal trends of the aforementioned meteorological parameters. Our finding suggests that global dimming and brightening in Japan occurred on a large scale, independently of urbanization. [ABSTRACT FROM AUTHOR]

Published
2016
Full Text
View/download PDF

22. Is global dimming and brightening in Japan limited to urban areas?

Author

Tanaka, Katsumasa, Ohmura, Atsumu, Folini, Doris, Wild, Martin, and Ohkawara, Nozomu

Subjects
13. Climate action, 11. Sustainability
Abstract

Worldwide observations indicate secular trends of all-sky surface solar radiation on a decadal time scale, termed global dimming and brightening. Accordingly, the observed surface radiation in Japan generally shows a strong decline until the end of the 1980s and then a recovery until around 2000. Because a substantial number of measurement stations are located within or close to populated areas, one may speculate that the observed trends are strongly influenced by local air pollution and are thus not of large-scale significance. This hypothesis poses a serious question as to what regional extent the global dimming and brightening are significant: are the global dimming and brightening truly global phenomena, or regional, or even only local? Our study focused on 14 meteorological observatories that measured all-sky surface solar radiation, zenith transmittance, and maximum transmittance. On the basis of municipality population time series, historical land use maps, recent satellite images, and actual site visits, we concluded that eight stations have been significantly influenced by urbanization, with the remaining six stations being left pristine. Between the urban and rural areas, no marked differences were identified in the temporal trends of the aforementioned meteorological parameters. Our findings suggest that global dimming and brightening in Japan occurred on a large scale, independently of urbanization., Atmospheric Chemistry and Physics, 16 (21), ISSN:1680-7375, ISSN:1680-7367

Catalog

Books, media, physical & digital resources
See catalog results