Helicopter-borne observations with portable microwave radiometer in the Southern Ocean and the Sea of Okhotsk
Accurately measuring and monitoring the thickness distribution of thin ice is crucial for accurate estimation of ocean–atmosphere heat fluxes and rates of ice production and salt flux in ice-affected oceans. Here we present results from helicopter-borne brightness temperature (TB) measurements in th...
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fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/70591 2023-05-15T13:29:12+02:00 Helicopter-borne observations with portable microwave radiometer in the Southern Ocean and the Sea of Okhotsk Tamura, Takeshi Ohshima, Kay I. Lieser, Jan L. Toyota, Takenobu Tateyama, Kazutaka Nomura, Daiki Nakata, Kazuki Fraser, Alexander D. Jansen, Peter W. Newbery, Kym B. Massom, Robert A. Ushio, Shuki http://hdl.handle.net/2115/70591 https://doi.org/10.3189/2015AoG69A621 eng eng Cambridge University Press https://www.igsoc.org/ http://hdl.handle.net/2115/70591 Annals of Glaciology, 56(69): 436-444 http://dx.doi.org/10.3189/2015AoG69A621 © 2015 The Authors http://creativecommons.org/licenses/by/4.0/ CC-BY remote sensing sea ice 660 article fthokunivhus https://doi.org/10.3189/2015AoG69A621 2022-11-18T01:04:56Z Accurately measuring and monitoring the thickness distribution of thin ice is crucial for accurate estimation of ocean–atmosphere heat fluxes and rates of ice production and salt flux in ice-affected oceans. Here we present results from helicopter-borne brightness temperature (TB) measurements in the Southern Ocean in October 2012 and in the Sea of Okhotsk in February 2009 carried out with a portable passive microwave (PMW) radiometer operating at a frequency of 36 GHz. The goal of these measurements is to aid evaluation of a satellite thin-ice thickness algorithm which uses data from the spaceborne Advanced Microwave Scanning Radiometer–Earth Observing System AMSR-E) or the Advanced Microwave Scanning Radiometer-II (AMSR-II). AMSR-E and AMSR-II TB agree with the spatially collocated mean TB from the helicopter-borne measurements within the radiometers’ precision. In the Sea of Okhotsk in February 2009, the AMSR-E 36GHz TB values are closer to the mean than the modal TB values measured by the helicopter-borne radiometer. In an Antarctic coastal polynya in October 2012, the polarization ratio of 36GHz vertical and horizontal TB is estimated to be 0.137 on average. Our measurements of the TB at 36 GHz over an iceberg tongue suggest a way to discriminate it from sea ice by its unique PMW signature. Article in Journal/Newspaper Annals of Glaciology Antarc* Antarctic Iceberg* Sea ice Southern Ocean Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) Antarctic Okhotsk Southern Ocean Annals of Glaciology 56 69 436 444 |
institution |
Open Polar |
collection |
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
op_collection_id |
fthokunivhus |
language |
English |
topic |
remote sensing sea ice 660 |
spellingShingle |
remote sensing sea ice 660 Tamura, Takeshi Ohshima, Kay I. Lieser, Jan L. Toyota, Takenobu Tateyama, Kazutaka Nomura, Daiki Nakata, Kazuki Fraser, Alexander D. Jansen, Peter W. Newbery, Kym B. Massom, Robert A. Ushio, Shuki Helicopter-borne observations with portable microwave radiometer in the Southern Ocean and the Sea of Okhotsk |
topic_facet |
remote sensing sea ice 660 |
description |
Accurately measuring and monitoring the thickness distribution of thin ice is crucial for accurate estimation of ocean–atmosphere heat fluxes and rates of ice production and salt flux in ice-affected oceans. Here we present results from helicopter-borne brightness temperature (TB) measurements in the Southern Ocean in October 2012 and in the Sea of Okhotsk in February 2009 carried out with a portable passive microwave (PMW) radiometer operating at a frequency of 36 GHz. The goal of these measurements is to aid evaluation of a satellite thin-ice thickness algorithm which uses data from the spaceborne Advanced Microwave Scanning Radiometer–Earth Observing System AMSR-E) or the Advanced Microwave Scanning Radiometer-II (AMSR-II). AMSR-E and AMSR-II TB agree with the spatially collocated mean TB from the helicopter-borne measurements within the radiometers’ precision. In the Sea of Okhotsk in February 2009, the AMSR-E 36GHz TB values are closer to the mean than the modal TB values measured by the helicopter-borne radiometer. In an Antarctic coastal polynya in October 2012, the polarization ratio of 36GHz vertical and horizontal TB is estimated to be 0.137 on average. Our measurements of the TB at 36 GHz over an iceberg tongue suggest a way to discriminate it from sea ice by its unique PMW signature. |
format |
Article in Journal/Newspaper |
author |
Tamura, Takeshi Ohshima, Kay I. Lieser, Jan L. Toyota, Takenobu Tateyama, Kazutaka Nomura, Daiki Nakata, Kazuki Fraser, Alexander D. Jansen, Peter W. Newbery, Kym B. Massom, Robert A. Ushio, Shuki |
author_facet |
Tamura, Takeshi Ohshima, Kay I. Lieser, Jan L. Toyota, Takenobu Tateyama, Kazutaka Nomura, Daiki Nakata, Kazuki Fraser, Alexander D. Jansen, Peter W. Newbery, Kym B. Massom, Robert A. Ushio, Shuki |
author_sort |
Tamura, Takeshi |
title |
Helicopter-borne observations with portable microwave radiometer in the Southern Ocean and the Sea of Okhotsk |
title_short |
Helicopter-borne observations with portable microwave radiometer in the Southern Ocean and the Sea of Okhotsk |
title_full |
Helicopter-borne observations with portable microwave radiometer in the Southern Ocean and the Sea of Okhotsk |
title_fullStr |
Helicopter-borne observations with portable microwave radiometer in the Southern Ocean and the Sea of Okhotsk |
title_full_unstemmed |
Helicopter-borne observations with portable microwave radiometer in the Southern Ocean and the Sea of Okhotsk |
title_sort |
helicopter-borne observations with portable microwave radiometer in the southern ocean and the sea of okhotsk |
publisher |
Cambridge University Press |
url |
http://hdl.handle.net/2115/70591 https://doi.org/10.3189/2015AoG69A621 |
geographic |
Antarctic Okhotsk Southern Ocean |
geographic_facet |
Antarctic Okhotsk Southern Ocean |
genre |
Annals of Glaciology Antarc* Antarctic Iceberg* Sea ice Southern Ocean |
genre_facet |
Annals of Glaciology Antarc* Antarctic Iceberg* Sea ice Southern Ocean |
op_relation |
https://www.igsoc.org/ http://hdl.handle.net/2115/70591 Annals of Glaciology, 56(69): 436-444 http://dx.doi.org/10.3189/2015AoG69A621 |
op_rights |
© 2015 The Authors http://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3189/2015AoG69A621 |
container_title |
Annals of Glaciology |
container_volume |
56 |
container_issue |
69 |
container_start_page |
436 |
op_container_end_page |
444 |
_version_ |
1765999241802547200 |