沙尘源区LST/Albedo时序变化与TSP的对比分析——以2001年春季中国北方强沙尘过程为例

Comparison analysis of AVHRR LST/Albedo temporal changes and TSP data: a case study on strong duststorm process during March to May,2001

20 0 1年春季 ,中国北方多次受到沙尘天气的影响 ,给人们的生产、生活带来严重的威胁 ,引起了亚洲国家的广泛重视。利用卫星监测数据采集沙尘云图变化、运移路径、地表覆盖和沙尘过程中的地面反照率、温度、湿度、粗糙度等物理参数反演实验结果 ,可以弥补地面观测站点稀少、数据不连续的缺陷。本文以 2 0 0 1年 3月到 5月的几次沙尘天气为例 ,介绍基于地表覆盖的AVHRR的LST/Albedo反演结果与TSP (沙尘干量 )对比分析 ,发现它们具有较好的相关性。从而反映了沙尘暴发生前后地表能量的变化状况 ,能为预测预警沙尘天气的危害提供及时客观的空间信息。

In the spring of 2001, several duststorm events occurred in northern China which seriously threatened production and people’s life and caused troubles to air transportations in South Korea and Japan. The duststorm weather was a strong wind erosion process in terms of duststorm source, transportation and precipitation. The mechanism of duststorm process is the cornerstone for duststorm forecast model. Estphal(1988), Joussaume(1990)and Gillette (1989) published a wind erosion based model;Shao (1997)and Lu (2001) took five different factors into account developing an integrated model including climate condition, land cover/change, wind erosion, transportation as well as precipitation factors. The duststorm also had very close relation with surface physical parameters such as soil moisture, temperature roughness and radiation which were the very important parameters for land and air energy exchange. They also played important roles in duststorm process. Brest(1987),Tian(1990) and Zu Hanwen(1993) pubilshed their retrieving models for albedo and temperature using AVHRR data. By using remote sensing data to monitor dust clouds change, transportation road and to retrieve surface temperature, soil moisture, roughness in compensation to the shortcomings of sparsely located observation stations and discontinues data collection. The data retrieved from satellite has become very important data source for duststorm monitoring. Chinese and Japanese-initiated a joint project in 2000 to set up ground observation stations along dust source areas such as transportation roads,precipitation areas for collecting TSP (dry dust precipitation) and utilizing AVHRR data to retrieve albedo(surface energy).And then data were selected from retrieved albedo temporal imageries to make curves and comparison was made between albedo curves and TSP curves. The result showed that there were good correlation betweens the two kinds of curves. It was proved that the LST/Albedo could be one of the physical parameters for predicting duststorm in future monitoring systems.