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.
风三微波亮温数据在北疆地区的雪深反演研究
- Title:
- Research on Snow Depth Retrieval from FY-3B Microwave Brightness Temperature in North Xinjiang
- 关键词:
- 北疆地区; FY-3B 微波成像仪; 降轨; 亮温; 模型反演误差
- Keywords:
- North Xinjiang; FY-3B microwave radiation imager; descent orbit; brightness temperature; model inversion error
- 分类号:
- TP722.6;P426.63+5
- 摘要:
- 根据地理环境和气候差异将新疆北疆地区分为天山北坡、阿勒泰地区、塔额盆地、伊犁地区和古尔班通古特沙漠5个典型区域，计算了2010—2011年冬春两季FY-3B微波成像仪（MWRI） L1 18.7 GHz和36.5 GHz垂直/水平极化4通道降轨亮温数据，采用Neale干湿雪判别标准去除湿雪像元，同时结合MOD10A1日雪盖产品剔除无雪区，得到各个分区积雪区域内的干雪像元亮温数据，将其与对应气象站同期实测雪深进行回归拟合，其中，实测雪深满足日最高温 < 6℃和雪深≥5 cm两个条件，最终建立了北疆地区5个典型分区的干雪雪深反演模型。结果显示，①天山北坡、阿勒泰地区气象站分布均匀且数量较多，反演误差较小，实测雪深≥15 cm时，误差百分比仅为8%和11%；古尔班通古特沙漠测站虽少，但其模型反演误差最小，由于该区域站点较少，模型代表性不够；②北疆冬季气温较低，易形成深霜层和冻土层，这会对微波辐射形成较大的影响，在冬季温度较低、积雪深度较大的阿勒泰地区和塔额盆地表现得尤为明显。
- 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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备注/Memo
收稿日期:2013-01-04;改回日期:2013-02-04。
基金项目:国家科技支撑项目（2012BAC23B01）；公益性行业（气象）科研专项（GYHY201106007）；国家自然科学基金（41271098）
作者简介:李杨(1976-),女,新疆石河子人,学士,副研究员,主要从事积雪遥感等方面的研究。E-mail:liyang@idm.cn