Evaluation of MODIS and Himawari‐8 Low Clouds Retrievals Over the Southern Ocean With In Situ Measurements From the SOCRATES Campaign
Abstract Aircraft observations collected during the Southern Ocean Cloud Radiation Aerosol Transport Experimental Study in January‐February of 2018 are used to evaluate cloud properties from three satellite‐imager datasets: (1) the Moderate Resolution Imaging Spectroradiometer level 2 (collection 6....
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ftdoajarticles:oai:doaj.org/article:89c8e0c6fb304948ab5b12c711956a8f 2023-05-15T18:24:52+02:00 Evaluation of MODIS and Himawari‐8 Low Clouds Retrievals Over the Southern Ocean With In Situ Measurements From the SOCRATES Campaign Litai Kang Roger Marchand William Smith 2021-03-01T00:00:00Z https://doi.org/10.1029/2020EA001397 https://doaj.org/article/89c8e0c6fb304948ab5b12c711956a8f EN eng American Geophysical Union (AGU) https://doi.org/10.1029/2020EA001397 https://doaj.org/toc/2333-5084 2333-5084 doi:10.1029/2020EA001397 https://doaj.org/article/89c8e0c6fb304948ab5b12c711956a8f Earth and Space Science, Vol 8, Iss 3, Pp n/a-n/a (2021) clouds himawari‐8 MODIS remote sensing SOCRATES southern ocean Astronomy QB1-991 Geology QE1-996.5 article 2021 ftdoajarticles https://doi.org/10.1029/2020EA001397 2022-12-31T06:34:03Z Abstract Aircraft observations collected during the Southern Ocean Cloud Radiation Aerosol Transport Experimental Study in January‐February of 2018 are used to evaluate cloud properties from three satellite‐imager datasets: (1) the Moderate Resolution Imaging Spectroradiometer level 2 (collection 6.1) cloud product, (2) the CERES‐MODIS Edition 4 cloud product, and (3) the NASA SatCORPS Himawari‐8 cloud product. Overall the satellite retrievals compare well with the in situ observations, with little bias and modest to good correlation coefficients when considering all aircraft profiles for which there are coincident MODIS observations. The Himawari‐8 product does, however, show a statistically significant mean bias of about 1.2 μm for effective radius (re) and 2.6 for optical depth (τ) when applied to a larger set of profiles with coincident Himawari‐8 observations. The low overall mean‐bias in the re retrievals is due in part to compensating errors between cases that are non‐ or lightly precipitating, with cases that have heavier precipitation. re is slightly biased high (by about 0.5–1.0 μm) for non‐ and lightly precipitating cases and biased low by about 3–4 μm for heavily precipitating cases when precipitation exits near cloud top. The bias in non‐ and lightly precipitating conditions is due to (at least in part) having assumed a drop size distribution in the retrieval that is too broad. These biases in the re ultimately propagate into the retrieved liquid water path and number concentration. Article in Journal/Newspaper Southern Ocean Directory of Open Access Journals: DOAJ Articles Southern Ocean Earth and Space Science 8 3 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
clouds himawari‐8 MODIS remote sensing SOCRATES southern ocean Astronomy QB1-991 Geology QE1-996.5 |
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clouds himawari‐8 MODIS remote sensing SOCRATES southern ocean Astronomy QB1-991 Geology QE1-996.5 Litai Kang Roger Marchand William Smith Evaluation of MODIS and Himawari‐8 Low Clouds Retrievals Over the Southern Ocean With In Situ Measurements From the SOCRATES Campaign |
topic_facet |
clouds himawari‐8 MODIS remote sensing SOCRATES southern ocean Astronomy QB1-991 Geology QE1-996.5 |
description |
Abstract Aircraft observations collected during the Southern Ocean Cloud Radiation Aerosol Transport Experimental Study in January‐February of 2018 are used to evaluate cloud properties from three satellite‐imager datasets: (1) the Moderate Resolution Imaging Spectroradiometer level 2 (collection 6.1) cloud product, (2) the CERES‐MODIS Edition 4 cloud product, and (3) the NASA SatCORPS Himawari‐8 cloud product. Overall the satellite retrievals compare well with the in situ observations, with little bias and modest to good correlation coefficients when considering all aircraft profiles for which there are coincident MODIS observations. The Himawari‐8 product does, however, show a statistically significant mean bias of about 1.2 μm for effective radius (re) and 2.6 for optical depth (τ) when applied to a larger set of profiles with coincident Himawari‐8 observations. The low overall mean‐bias in the re retrievals is due in part to compensating errors between cases that are non‐ or lightly precipitating, with cases that have heavier precipitation. re is slightly biased high (by about 0.5–1.0 μm) for non‐ and lightly precipitating cases and biased low by about 3–4 μm for heavily precipitating cases when precipitation exits near cloud top. The bias in non‐ and lightly precipitating conditions is due to (at least in part) having assumed a drop size distribution in the retrieval that is too broad. These biases in the re ultimately propagate into the retrieved liquid water path and number concentration. |
format |
Article in Journal/Newspaper |
author |
Litai Kang Roger Marchand William Smith |
author_facet |
Litai Kang Roger Marchand William Smith |
author_sort |
Litai Kang |
title |
Evaluation of MODIS and Himawari‐8 Low Clouds Retrievals Over the Southern Ocean With In Situ Measurements From the SOCRATES Campaign |
title_short |
Evaluation of MODIS and Himawari‐8 Low Clouds Retrievals Over the Southern Ocean With In Situ Measurements From the SOCRATES Campaign |
title_full |
Evaluation of MODIS and Himawari‐8 Low Clouds Retrievals Over the Southern Ocean With In Situ Measurements From the SOCRATES Campaign |
title_fullStr |
Evaluation of MODIS and Himawari‐8 Low Clouds Retrievals Over the Southern Ocean With In Situ Measurements From the SOCRATES Campaign |
title_full_unstemmed |
Evaluation of MODIS and Himawari‐8 Low Clouds Retrievals Over the Southern Ocean With In Situ Measurements From the SOCRATES Campaign |
title_sort |
evaluation of modis and himawari‐8 low clouds retrievals over the southern ocean with in situ measurements from the socrates campaign |
publisher |
American Geophysical Union (AGU) |
publishDate |
2021 |
url |
https://doi.org/10.1029/2020EA001397 https://doaj.org/article/89c8e0c6fb304948ab5b12c711956a8f |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Earth and Space Science, Vol 8, Iss 3, Pp n/a-n/a (2021) |
op_relation |
https://doi.org/10.1029/2020EA001397 https://doaj.org/toc/2333-5084 2333-5084 doi:10.1029/2020EA001397 https://doaj.org/article/89c8e0c6fb304948ab5b12c711956a8f |
op_doi |
https://doi.org/10.1029/2020EA001397 |
container_title |
Earth and Space Science |
container_volume |
8 |
container_issue |
3 |
_version_ |
1766205857248313344 |