Analysis of changes in the Arctic polynya based on AMSR-E remote-sensing data

doi:10.13679/j.jdyj.20180035

Abstract

Abstract:

Four types of remote-sensing data, namely: Advanced Microwave Scanning Radiometer for the Earth Observing System (AMSR-E) 36 GHz and 89 GHz gridded brightness temperature data and the AMSR-E ice-concentration data retrieved from those bands, combined with two retrieval methods, were used to determine polynyas of the Arctic. Variations in polynyas along the east coast of Siberia and the west coast of Alaska were analyzed using data for January to April during the period 2003–2011. Comparisons were made using the different data and methods. The main results showed that: (1) patterns of variations in the polynyas were similar, but the values differed, as the polynyas derived from the AMSR-E 89 GHz brightness temperature data showed an increasing trend over the long-term, while the results for AMSR-E sea-ice concentration retrieved from the AMSR-E 89 GHz and 36 GHz and the AMSR-E 36 GHz brightness temperature data showed a decreasing trend; (2) high-resolution data could resolve polynyas more precisely, thus obtaining a larger area, and vice versa with low-resolution data; (3) the polynyas retrieved from the ice-thickness approach were larger than that from ice-concentration approach owing to their different delineations of a polynya; and (4) variations in polynya areas revealed differences at a regional level, with more significant differences for areas west of the Bering Strait and weaker difference for areas to the east.

Key words: Arctic polynya, remote sensing data, retrieval methods, temporal variation, comparative analysis

Xie Xiaolei, Wei Yongliang, Zhang Yu. Analysis of changes in the Arctic polynya based on AMSR-E remote-sensing data[J]. , 2019, 31(2): 179-190.

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