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A study on the dynamic tie points ASI algorithm in the Arctic Ocean

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Abstract

Sea ice concentration is an important parameter for polar sea ice monitoring. Based on 89 GHz AMSR-E (Advanced Microwave Scanning Radiometer for Earth Observing System) data, a gridded high-resolution passive microwave sea ice concentration product can be obtained using the ASI (the Arctic Radiation And Turbulence Interaction Study (ARTIST) Sea Ice) retrieval algorithm. Instead of using fixed-point values, we developed ASI algorithm based on daily changed tie points, called as the dynamic tie point ASI algorithm in this study. Here the tie points are expressed as the brightness temperature polarization difference of open water and 100% sea ice. In 2010, the yearly-averaged tie points of open water and sea ice in Arctic are estimated to be 50.8 K and 7.8 K, respectively. It is confirmed that the sea ice concentrations retrieved by the dynamic tie point ASI algorithm can increase (decrease) the sea ice concentrations in low-value (high-value) areas. This improved the sea ice concentrations by present retrieval algorithm from microwave data to some extent. Comparing with the products using fixed tie points, the sea ice concentrations retrieved from AMSR-E data by using the dynamic tie point ASI algorithm are closer to those obtained from MODIS (Moderate-resolution Imaging Spectroradiometer) data. In 40 selected cloud-free sample regions, 95% of our results have smaller mean differences and 75% of our results have lower root mean square (RMS) differences compare with those by the fixed tie points.

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Authors and Affiliations

  1. Key Laboratory of Physical Oceanography of Ministry of Education, Ocean University of China, Qingdao, 266100, China

    Guanghua Hao & Jie Su

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  1. Guanghua Hao
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  2. Jie Su
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Correspondence to Jie Su.

Additional information

Foundation item: The Global Change Research Program of China under contract No. 2015CB953901; the National Natural Science Foundation of China under contract Nos 41330960 and 41276193.

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Hao, G., Su, J. A study on the dynamic tie points ASI algorithm in the Arctic Ocean. Acta Oceanol. Sin. 34, 126–135 (2015). https://doi.org/10.1007/s13131-015-0659-y

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  • DOI: https://doi.org/10.1007/s13131-015-0659-y

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