一种基于卫星遥感与地面测站数据融合技术的雪深动态反演方法

赵亮; 朱玉祥; 杨弘; 胡娅敏; 夏明; 郭建平

doi:10.11676/qxxb2013.056

一种基于卫星遥感与地面测站数据融合技术的雪深动态反演方法

1.
61741部队, 北京, 100094
2.
中国气象局气象干部培训学院, 北京, 100081
3.
广东省气候中心, 广州, 510080
4.
中国气象科学研究院大气成分研究所, 北京, 100081

基金项目:

国家重大科学研究计划(2012CB957800(801,804));国家重点基础研究发展计划(2012CB417205);国家自然科学基金项目(40805026);国家公益性行业(气象)科研专项(GYHY201206040).

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出版历程
- 收稿日期: 2012-10-23
- 修回日期: 2013-04-01
- 发布日期: 2013-04-09

A dynamic approach to retrieving snow depth based on the technology of integrating satellite remote sensing and in situ data

1.
61741 Troops of PLA, Beijing 100094, China
2.
CMA Training Center, Beijing 100081, China
3.
Guangdong Climate Center, Guungzhou 510080, China
4.
Institute of Atmospher Composition, Chinese Academy of Meteorological Sciences, Beijing 100081, China

摘要

摘要: 提出了一种新的基于被动微波遥感和地面测站数据融合技术的雪深动态反演方法.这种新方法不再依赖单一的地面测站数据或卫星遥感数据,而是利用它们联合建立雪盖可信度指数,共同确定雪盖分布;然后在此基础上采用时空距离权重法设定反演系数动态参数化方案,反演雪深.这种雪深反演方法具有以下特点:针对不同时空条件下反演系数的动态差异问题,提出利用实时测站观测雪深,灵活调整雪深反演系数的解决方案,使反演系数具备随时空动态调整的能力,这是与静态反演方法最大的区别;充分利用了被动微波遥感数据时空连续性好的优势,能够在测站稀少的西部高山地区反演出空间分辨率相对较高的雪深数据,这是地面观测无法做到的.初步检验结果显示,该方法较明显地提高了中国西部高原地区和东部雪盖南缘区的反演精度,并克服了原有融合方法在中国西部雪盖面积偏小的问题,有效避免了静态反演方法在高山地区严重高估而平原地区低估雪深的问题,实现了被动微波遥感和地面观测数据的有效融合,扩大了雪深监测的有效范围
- 积雪深度 /
- 雪盖 /
- 反演 /
- 被动微波遥感 /
- 青藏高原
Abstract: A new dynamic approach to retrieving snow depth is developed based on integration of passive microwave remote sensing and in situ data.First,the snow-cover confidence index is established by use of both the passive microwave remote sensing and in situ data to identify the snow cover; second,a new dynamic parameterized scheme (the distance weighted method) is developed based on the index.The characteristics of the snow-depth retrieval approach arc as follows:on the one hand, for the difference issue of retrieval coefficients in different spatial-temporal circumstances,a solution is proposed that retrieval coefficients arc able to be adjusted according to real-time observed snow depth,which is the biggest difference from static retricval approaches;on the other hand,the advantage of spatial-temporal continuity of the passive microwave remote sensing da-to has been fully exploited,being able to retrieve the snow depth with relative high resolution and precision in the west China where few stations arc located.The results show that the approach implements the efficient integration of passive microwave remote sensing and observed data, exerts the advantages of different source data, improves obviously the retrieval precision in the western part of China and the south marginal regions of snow cover in eastern China, and solves the question in the old integrating approach that the area of snow cover was always relatively smaller than normal in the west China, amplifying the detectable coverage area of snow depth.In contrast to the static retrieval approach,the dynamic retrieval approach avoids efficiently the question that snow depth was overestimated in mountain regions and underestimated in plain regions.
- Snow depth /
- Snow cover /
- Retrieving /
- Passive microwavc remote sensing /
- the Tibetan Plateau

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