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科尔沁沙地流动沙丘与玉米地辐射特性比较分析
CHARACTERISTICS OF RADIATION BALANCE OVER MOVING DUNE AND FIELD AREA IN KEERQIN DESERT REGION OF CHINA
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摘要: 利用2001年夏季内蒙古科尔沁沙地地区大气边界层实验观测资料，对比分析了流动沙丘和临近流动沙丘的玉米地两种典型下垫面的辐射通量特征。结果表明：流动沙丘和玉米地地区的总辐射与大气逆辐射相近，差异不足2%。净辐射、地表反照率、有效辐射存在较大差异，流动沙丘的净辐射明显小于玉米地，其中反照率差异的贡献约为60%，长波辐射差异的贡献约为40%。流动沙丘的反照率、有效辐射明显大于玉米地，反照率高出中国西北HEIFE实验沙漠地区约10%，有效辐射则小于沙漠地区。Abstract: The characteristics of the surface radiation components are analyzed by using the measurement data obtained the moving dune and the field area in the Keerqin desert region of Nei Mongol, China in the summer of 2001. The results show that the characteristics of the radiation, such as global solar radiation and long-wave radiation, over the moving dune area are similar to those over the field area. The value of net radiation over the moving dune area is obviously lower than over the field area. Meanwhile, the value of albedo and the effective radiation over the moving dune are higher than those over the field respectively. The value of albedo over the moving dune exceeds that of the Desert station in HEIFE by 10%, and the effective radiation is lower than that of the Desert station.
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Key words:
- Radiation;
- Moving dune;
- Human activity;
- Observational method
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图 3 各辐射通量观测值的平均日变化 (a) 玉米地地区和 (b) 流动沙丘地区
(1总辐射, 2净辐射, 3地面长波辐射, 4大气逆辐射, 5地面反射辐射, 6有效辐射)
表 1 夏季晴天状况下本研究和HEIFE实验的沙漠站和临泽站 (绿洲) 辐射平衡日总量观测结果比较
表 2 流动沙丘与玉米地晴天和阴天的日平均反照率和长波辐射日总量的观测结果比较
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