Spatial and Temporal Variability of Minimum Brightness Temperature at the 6.925 GHz Band of AMSR2 for the Arctic and Antarctic Oceans
The minimum brightness temperature (mBT) of seawater in the polar region is an important parameter in algorithms for determining sea ice concentration or snow depth. To estimate the mBT of seawater at 6.925 GHz for the Arctic and Antarctic Oceans and to find their physical characteristics, we collec...
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ftmdpi:oai:mdpi.com:/2072-4292/13/11/2122/ 2023-08-20T04:01:31+02:00 Spatial and Temporal Variability of Minimum Brightness Temperature at the 6.925 GHz Band of AMSR2 for the Arctic and Antarctic Oceans Young-Joo Kwon Sungwook Hong Jeong-Won Park Seung Hee Kim Jong-Min Kim Hyun-Cheol Kim 2021-05-28 application/pdf https://doi.org/10.3390/rs13112122 EN eng Multidisciplinary Digital Publishing Institute https://dx.doi.org/10.3390/rs13112122 https://creativecommons.org/licenses/by/4.0/ Remote Sensing; Volume 13; Issue 11; Pages: 2122 passive microwave ocean AMSR2 tie point Arctic amplification Text 2021 ftmdpi https://doi.org/10.3390/rs13112122 2023-08-01T01:49:49Z The minimum brightness temperature (mBT) of seawater in the polar region is an important parameter in algorithms for determining sea ice concentration or snow depth. To estimate the mBT of seawater at 6.925 GHz for the Arctic and Antarctic Oceans and to find their physical characteristics, we collected brightness temperature and sea ice concentration data from the Advanced Microwave Scanning Radiometer 2 (AMSR2) for eight years from 2012 to 2020. The estimated mBT shows constant annual values, but we found a significant difference in the seasonal variability between the Arctic and Antarctic Oceans. We calculated the mBT with the radiative transfer model parameterized by sea surface temperature (SST), sea surface wind speed (SSW), and integrated water vapor (IWV) and compared them with our observations. The estimated mBT represents the modeled mBT emitted from seawater under conditions of 2–5 m/s SSW and SST below 0 °C, except in the Arctic summer. The exceptional summer mBT in the Arctic Ocean was related to unusually high SST. We found evidence of Arctic amplification in the seasonal variability of Arctic mBT. Text Antarc* Antarctic Arctic Arctic Ocean Sea ice MDPI Open Access Publishing Antarctic Arctic Arctic Ocean Remote Sensing 13 11 2122 |
institution |
Open Polar |
collection |
MDPI Open Access Publishing |
op_collection_id |
ftmdpi |
language |
English |
topic |
passive microwave ocean AMSR2 tie point Arctic amplification |
spellingShingle |
passive microwave ocean AMSR2 tie point Arctic amplification Young-Joo Kwon Sungwook Hong Jeong-Won Park Seung Hee Kim Jong-Min Kim Hyun-Cheol Kim Spatial and Temporal Variability of Minimum Brightness Temperature at the 6.925 GHz Band of AMSR2 for the Arctic and Antarctic Oceans |
topic_facet |
passive microwave ocean AMSR2 tie point Arctic amplification |
description |
The minimum brightness temperature (mBT) of seawater in the polar region is an important parameter in algorithms for determining sea ice concentration or snow depth. To estimate the mBT of seawater at 6.925 GHz for the Arctic and Antarctic Oceans and to find their physical characteristics, we collected brightness temperature and sea ice concentration data from the Advanced Microwave Scanning Radiometer 2 (AMSR2) for eight years from 2012 to 2020. The estimated mBT shows constant annual values, but we found a significant difference in the seasonal variability between the Arctic and Antarctic Oceans. We calculated the mBT with the radiative transfer model parameterized by sea surface temperature (SST), sea surface wind speed (SSW), and integrated water vapor (IWV) and compared them with our observations. The estimated mBT represents the modeled mBT emitted from seawater under conditions of 2–5 m/s SSW and SST below 0 °C, except in the Arctic summer. The exceptional summer mBT in the Arctic Ocean was related to unusually high SST. We found evidence of Arctic amplification in the seasonal variability of Arctic mBT. |
format |
Text |
author |
Young-Joo Kwon Sungwook Hong Jeong-Won Park Seung Hee Kim Jong-Min Kim Hyun-Cheol Kim |
author_facet |
Young-Joo Kwon Sungwook Hong Jeong-Won Park Seung Hee Kim Jong-Min Kim Hyun-Cheol Kim |
author_sort |
Young-Joo Kwon |
title |
Spatial and Temporal Variability of Minimum Brightness Temperature at the 6.925 GHz Band of AMSR2 for the Arctic and Antarctic Oceans |
title_short |
Spatial and Temporal Variability of Minimum Brightness Temperature at the 6.925 GHz Band of AMSR2 for the Arctic and Antarctic Oceans |
title_full |
Spatial and Temporal Variability of Minimum Brightness Temperature at the 6.925 GHz Band of AMSR2 for the Arctic and Antarctic Oceans |
title_fullStr |
Spatial and Temporal Variability of Minimum Brightness Temperature at the 6.925 GHz Band of AMSR2 for the Arctic and Antarctic Oceans |
title_full_unstemmed |
Spatial and Temporal Variability of Minimum Brightness Temperature at the 6.925 GHz Band of AMSR2 for the Arctic and Antarctic Oceans |
title_sort |
spatial and temporal variability of minimum brightness temperature at the 6.925 ghz band of amsr2 for the arctic and antarctic oceans |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2021 |
url |
https://doi.org/10.3390/rs13112122 |
geographic |
Antarctic Arctic Arctic Ocean |
geographic_facet |
Antarctic Arctic Arctic Ocean |
genre |
Antarc* Antarctic Arctic Arctic Ocean Sea ice |
genre_facet |
Antarc* Antarctic Arctic Arctic Ocean Sea ice |
op_source |
Remote Sensing; Volume 13; Issue 11; Pages: 2122 |
op_relation |
https://dx.doi.org/10.3390/rs13112122 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/rs13112122 |
container_title |
Remote Sensing |
container_volume |
13 |
container_issue |
11 |
container_start_page |
2122 |
_version_ |
1774724780543442944 |