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

Citation

Tamura, T and Ohshima, KI and Lieser, JL and Toyota, T and Tateyama, K and Nomura, D and Nakata, K and Fraser, AD and Jansen, PW and Newbery, KB and Massom, RA and Ushio, S, Helicopter-borne observations with portable microwave radiometer in the Southern Ocean and the Sea of Okhotsk, Annals of Glaciology, 56, (69) pp. 436-444. ISSN 0260-3055 (2015) [Refereed Article]


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Copyright 2015 The Author(s) Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) http://creativecommons.org/licenses/by/4.0/

DOI: 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 36GHz over an iceberg tongue suggest a way to discriminate it from sea ice by its unique PMW signature.

Item Details

Item Type:Refereed Article
Keywords:remote sensing, sea ice
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Physical Oceanography
Objective Division:Environment
Objective Group:Physical and Chemical Conditions of Water
Objective Field:Physical and Chemical Conditions of Water in Marine Environments
Author:Tamura, T (Dr Takeshi Tamura)
Author:Lieser, JL (Dr Jan Lieser)
Author:Fraser, AD (Dr Alex Fraser)
Author:Jansen, PW (Mr Peter Jansen)
Author:Massom, RA (Dr Robert Massom)
ID Code:106050
Year Published:2015
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2016-01-27
Last Modified:2017-10-30
Downloads:26 View Download Statistics

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