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[1]LI Yang,ZHANG Pu,LIU Yan,et al.Research on Snow Depth Retrieval from FY-3B Microwave Brightness Temperature in North Xinjiang[J].Research of Soil and Water Conservation,2013,20(04):166-171.

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Research on Snow Depth Retrieval from FY-3B Microwave Brightness Temperature in North Xinjiang

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 20 Number of periods: 2013 04 Page number: 166-171 Column: Public date: 2013-08-28

Title:: Research on Snow Depth Retrieval from FY-3B Microwave Brightness Temperature in North Xinjiang

Author(s):: LI Yang¹, ZHANG Pu², LIU Yan¹, LU Xin-yu³, MA Li-yun²; 1. Institute of Desert Meteorology CMA, Urumqi 830002, China;
2. Urumqi Meteorological Satellite Ground Station, Urumqi 830011, China;
3. Xinjiang Meteorological Observatory, Urumqi 830002, China

Keywords:: North Xinjiang; FY-3B microwave radiation imager; descent orbit; brightness temperature; model inversion error

CLC:: TP722.6;P426.63⁺5

DOI:: -

Abstract:: According to geographical environment and climatic differences, North Xinjiang was divided into five typical regions: the northern slope of Tianshan, Altai region, Tae basin, Yili Prefecture and Gurbantunggut Desert. Brightness temperature data at 18.7 GHz and 36.5 GHz vertical and horizontal polarization channel were calculated by L1 data of FY-3B microwave radiation imager (MWRI) at 2010—2011 winter and spring in the study area. Based on Neale’s wet and dry snow criterion, wet snow pixels were removed. Non-snow zone was also excluded combining MOD10A1 day snow cover products. Brightness temperature data of dry snow pixel in sub-snow-regions were extracted. And then the measured snow depth of corresponding weather stations and the extracted brightness temperature data were fitted during the same period. The measured snow depth needed to meet two conditions, where the daily maximum temperature was less than 6℃ and the snow depth was greater than or equal to 5 cm. Finally, the dry snow depth retrieval model was established respectively for the five above regions. The results showed that: (1) for the evenly distributed weather stations, the model inversion error was small in Tianshan Mountains and Altay region. When the measured snow depth was greater than or equal to 15 cm, the error percentage of the two regions was only 8% and 11%, respectively; (2) the model inversion error for the Gurbantunggut Desert station was the least among the five regions, while a small number of sites in the region was insufficient to represent the model; (3) low winter temperature in north Xinjiang, lead to forming a deep layer of frost and permafrost easily. This might have a greater influence on microwave radiation. As their lower temperature and deeper snow depth in the winter, it was particularly obvious in Altay region and the Tae basin.

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