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Helicopter-borne observations with portable microwave radiometer in the Southern Ocean and the Sea of Okhotsk

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Title: Helicopter-borne observations with portable microwave radiometer in the Southern Ocean and the Sea of Okhotsk
Authors: Tamura, Takeshi Browse this author →KAKEN DB
Ohshima, Kay I. Browse this author →KAKEN DB
Lieser, Jan L. Browse this author
Toyota, Takenobu Browse this author →KAKEN DB
Tateyama, Kazutaka Browse this author
Nomura, Daiki Browse this author →KAKEN DB
Nakata, Kazuki Browse this author
Fraser, Alexander D. Browse this author
Jansen, Peter W. Browse this author
Newbery, Kym B. Browse this author
Massom, Robert A. Browse this author
Ushio, Shuki Browse this author →KAKEN DB
Keywords: remote sensing
sea ice
Issue Date: 2015
Publisher: Cambridge University Press
Journal Title: Annals of Glaciology
Volume: 56
Issue: 69
Start Page: 436
End Page: 444
Publisher DOI: 10.3189/2015AoG69A621
Abstract: 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.
Rights: © 2015 The Authors
http://creativecommons.org/licenses/by/4.0/
Relation: https://www.igsoc.org/
Type: article
URI: http://hdl.handle.net/2115/70591
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 野村 大樹

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