Thermal infrared dust optical depth and coarse-mode effective diameter over oceans retrieved from collocated MODIS and CALIOP observations
Abstract. In this study, we developed a novel algorithm based on the collocated Moderate Resolution Imaging Spectroradiometer (MODIS) thermal infrared (TIR) observations and dust vertical profiles from the Cloud–Aerosol Lidar with Orthogonal Polarization (CALIOP) to simultaneously retrieve dust aero...
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2023
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ftcdlib:oai:escholarship.org:ark:/13030/qt3pm2g0vs 2023-09-26T15:21:09+02:00 Thermal infrared dust optical depth and coarse-mode effective diameter over oceans retrieved from collocated MODIS and CALIOP observations Zheng, Jianyu Zhang, Zhibo Yu, Hongbin Garnier, Anne Song, Qianqian Wang, Chenxi Di Biagio, Claudia Kok, Jasper F Derimian, Yevgeny Ryder, Claire 8271 - 8304 2023-01-01 application/pdf https://escholarship.org/uc/item/3pm2g0vs unknown eScholarship, University of California qt3pm2g0vs https://escholarship.org/uc/item/3pm2g0vs CC-BY Atmospheric Chemistry and Physics, vol 23, iss 14 Climate Action Astronomical and Space Sciences Atmospheric Sciences Meteorology & Atmospheric Sciences article 2023 ftcdlib 2023-08-28T18:03:32Z Abstract. In this study, we developed a novel algorithm based on the collocated Moderate Resolution Imaging Spectroradiometer (MODIS) thermal infrared (TIR) observations and dust vertical profiles from the Cloud–Aerosol Lidar with Orthogonal Polarization (CALIOP) to simultaneously retrieve dust aerosol optical depth at 10 µm (DAOD10 µm) and the coarse-mode dust effective diameter (Deff) over global oceans. The accuracy of the Deff retrieval is assessed by comparing the dust lognormal volume particle size distribution (PSD) corresponding to retrieved Deff with the in situ-measured dust PSDs from the AERosol Properties – Dust (AER-D), Saharan Mineral Dust Experiment (SAMUM-2), and Saharan Aerosol Long-Range Transport and Aerosol–Cloud-Interaction Experiment (SALTRACE) field campaigns through case studies. The new DAOD10 µm retrievals were evaluated first through comparisons with the collocated DAOD10.6 µm retrieved from the combined Imaging Infrared Radiometer (IIR) and CALIOP observations from our previous study (Zheng et al., 2022). The pixel-to-pixel comparison of the two DAOD retrievals indicates a good agreement (R∼0.7) and a significant reduction in (∼50 %) retrieval uncertainties largely thanks to the better constraint on dust size. In a climatological comparison, the seasonal and regional (2∘×5∘) mean DAOD10 µm retrievals based on our combined MODIS and CALIOP method are in good agreement with the two independent Infrared Atmospheric Sounding Interferometer (IASI) products over three dust transport regions (i.e., North Atlantic (NA; R=0.9), Indian Ocean (IO; R=0.8) and North Pacific (NP; R=0.7)). Using the new retrievals from 2013 to 2017, we performed a climatological analysis of coarse-mode dust Deff over global oceans. We found that dust Deff over IO and NP is up to 20 % smaller than that over NA. Over NA in summer, we found a ∼50 % reduction in the number of retrievals with Deff>5 µm from 15 to 35∘ W and a stable trend of Deff average at 4.4 µm from 35∘ W throughout the Caribbean Sea (90∘ W). Over ... Article in Journal/Newspaper North Atlantic University of California: eScholarship Pacific Indian |
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Open Polar |
collection |
University of California: eScholarship |
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ftcdlib |
language |
unknown |
topic |
Climate Action Astronomical and Space Sciences Atmospheric Sciences Meteorology & Atmospheric Sciences |
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Climate Action Astronomical and Space Sciences Atmospheric Sciences Meteorology & Atmospheric Sciences Zheng, Jianyu Zhang, Zhibo Yu, Hongbin Garnier, Anne Song, Qianqian Wang, Chenxi Di Biagio, Claudia Kok, Jasper F Derimian, Yevgeny Ryder, Claire Thermal infrared dust optical depth and coarse-mode effective diameter over oceans retrieved from collocated MODIS and CALIOP observations |
topic_facet |
Climate Action Astronomical and Space Sciences Atmospheric Sciences Meteorology & Atmospheric Sciences |
description |
Abstract. In this study, we developed a novel algorithm based on the collocated Moderate Resolution Imaging Spectroradiometer (MODIS) thermal infrared (TIR) observations and dust vertical profiles from the Cloud–Aerosol Lidar with Orthogonal Polarization (CALIOP) to simultaneously retrieve dust aerosol optical depth at 10 µm (DAOD10 µm) and the coarse-mode dust effective diameter (Deff) over global oceans. The accuracy of the Deff retrieval is assessed by comparing the dust lognormal volume particle size distribution (PSD) corresponding to retrieved Deff with the in situ-measured dust PSDs from the AERosol Properties – Dust (AER-D), Saharan Mineral Dust Experiment (SAMUM-2), and Saharan Aerosol Long-Range Transport and Aerosol–Cloud-Interaction Experiment (SALTRACE) field campaigns through case studies. The new DAOD10 µm retrievals were evaluated first through comparisons with the collocated DAOD10.6 µm retrieved from the combined Imaging Infrared Radiometer (IIR) and CALIOP observations from our previous study (Zheng et al., 2022). The pixel-to-pixel comparison of the two DAOD retrievals indicates a good agreement (R∼0.7) and a significant reduction in (∼50 %) retrieval uncertainties largely thanks to the better constraint on dust size. In a climatological comparison, the seasonal and regional (2∘×5∘) mean DAOD10 µm retrievals based on our combined MODIS and CALIOP method are in good agreement with the two independent Infrared Atmospheric Sounding Interferometer (IASI) products over three dust transport regions (i.e., North Atlantic (NA; R=0.9), Indian Ocean (IO; R=0.8) and North Pacific (NP; R=0.7)). Using the new retrievals from 2013 to 2017, we performed a climatological analysis of coarse-mode dust Deff over global oceans. We found that dust Deff over IO and NP is up to 20 % smaller than that over NA. Over NA in summer, we found a ∼50 % reduction in the number of retrievals with Deff>5 µm from 15 to 35∘ W and a stable trend of Deff average at 4.4 µm from 35∘ W throughout the Caribbean Sea (90∘ W). Over ... |
format |
Article in Journal/Newspaper |
author |
Zheng, Jianyu Zhang, Zhibo Yu, Hongbin Garnier, Anne Song, Qianqian Wang, Chenxi Di Biagio, Claudia Kok, Jasper F Derimian, Yevgeny Ryder, Claire |
author_facet |
Zheng, Jianyu Zhang, Zhibo Yu, Hongbin Garnier, Anne Song, Qianqian Wang, Chenxi Di Biagio, Claudia Kok, Jasper F Derimian, Yevgeny Ryder, Claire |
author_sort |
Zheng, Jianyu |
title |
Thermal infrared dust optical depth and coarse-mode effective diameter over oceans retrieved from collocated MODIS and CALIOP observations |
title_short |
Thermal infrared dust optical depth and coarse-mode effective diameter over oceans retrieved from collocated MODIS and CALIOP observations |
title_full |
Thermal infrared dust optical depth and coarse-mode effective diameter over oceans retrieved from collocated MODIS and CALIOP observations |
title_fullStr |
Thermal infrared dust optical depth and coarse-mode effective diameter over oceans retrieved from collocated MODIS and CALIOP observations |
title_full_unstemmed |
Thermal infrared dust optical depth and coarse-mode effective diameter over oceans retrieved from collocated MODIS and CALIOP observations |
title_sort |
thermal infrared dust optical depth and coarse-mode effective diameter over oceans retrieved from collocated modis and caliop observations |
publisher |
eScholarship, University of California |
publishDate |
2023 |
url |
https://escholarship.org/uc/item/3pm2g0vs |
op_coverage |
8271 - 8304 |
geographic |
Pacific Indian |
geographic_facet |
Pacific Indian |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Atmospheric Chemistry and Physics, vol 23, iss 14 |
op_relation |
qt3pm2g0vs https://escholarship.org/uc/item/3pm2g0vs |
op_rights |
CC-BY |
_version_ |
1778145663346802688 |