Abstract
An enhanced ARTSIST Sea Ice (ASI) algorithm is presented based on a data fusion method of calculating total sea ice concentration from high-frequency microwave data. Algorithms that use low-frequency data to calculate total sea ice concentration are less affected by atmosphere, but their spatial resolutions tend to be lower. In contrast, algorithms using high-frequency data have higher spatial resolution but are significantly influenced by atmosphere. Although errors can be eliminated using weather filters, the concentration of mixed pixels cannot be modified. Here, an enhanced ASI algorithm uses the 19 GHz polarization difference to modify the 91 GHz polarization difference, which is substituted into the ASI algorithm to calculate total sea ice concentration. Arctic total sea ice concentration results are obtained based on Special Sensor Microwave Imager Sounder (SSMIS) data on January 3, from 2008 to 2017. Total sea ice area and average concentration using the enhanced ASI algorithm are compared to traditional ASI and NASA Team results. In the Marginal Ice Zone, there is a considerable difference between the enhanced and traditional ASI algorithm results, with the former much closer to the NASA Team results. The proposed algorithm effectively modifies the concentration of the mixed pixels in the marginal zone.
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We thank the anonymous reviewers for their time and effort, which significantly improve the manuscript.
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Foundation item: The National Natural Science Foundation of China under contract No. 41606209; the Open Fund from Key Laboratory of Global Change and Marine-Atmospheric Chemistry under contract No. GCMAC1605; the Natural Science Project of Henan Education Department under contract No. 15A120007; the Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, Chinese Academy of Sciences under contract No. KLOCW1805.
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Wu, Z., Wang, X. & Wang, X. An improved ARTSIST sea ice algorithm based on 19 GHz modified 91 GHz. Acta Oceanol. Sin. 38, 93–99 (2019). https://doi.org/10.1007/s13131-019-1482-7
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DOI: https://doi.org/10.1007/s13131-019-1482-7