| 塔克拉玛干沙漠腹地冬季地面反射光谱特征初探 |
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| 引用本文： | 袁玉江,胡列群.塔克拉玛干沙漠腹地冬季地面反射光谱特征初探[J].中国沙漠,1999,19(1):23-27. |
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| 作者姓名： | 袁玉江 胡列群 |
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| 作者单位： | 新疆气象科学研究所(袁玉江)，新疆气象卫星遥感中心(胡列群) |
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| 基金项目： | 航天工业部“干旱区域生态环境遥感动态监测和预测研究”课题 |
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| 摘 要： | 利用塔克拉玛干沙漠腹地塔中地区冬季４５３个光谱观测数据，进行了初步的分析探讨，得到了一些新认识，主要有：①碧空条件下，塔中地区沙漠的地面可见光通道反射率约为２５．８％，近红外通道反射率约为２８．６％；②碧空条件下，沙丘可见光及近红外通道的反射率具有在沙丘各部位，近红外通道的反射率大于可见光通道的反射率，而在沙丘的不同部位间，可见光通道的反射率变化较小，沙丘朝阳坡的可见光及近红外通道的反射率略大于背阴坡；③碧空、昙天、阴天中，可见光与近红外通道的反射率，均是以阴天为最大；④在较晴朗的天气条件下，沙丘的可见光及近红外通道的反射率均随着太阳高度角的增大而减小；⑤霜对沙面可见光及近红外通道的反射率起增加的作用，与无霜时比，可见光通道反射率增大约２．６％，近红外通道的反射率增大约３．５％。
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| 关 键 词： | 塔克拉玛干 沙漠腹地 冬季 地面反射 光谱特征 |
Features of Winter Reflective Spectrum of Sand Surface in Hinterland of Taklimakan Desert |
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| YUAN,Yu,jiang\ HU,Lie,qun.Features of Winter Reflective Spectrum of Sand Surface in Hinterland of Taklimakan Desert[J].Journal of Desert Research,1999,19(1):23-27. |
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| Authors: | YUAN Yu jiang\ HU Lie qun |
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| Abstract: | Under clear air condition, the reflective ratio of visible tunnel over desert surface in Tazhong area is about 25 8%, and that of near infrared tunnel is 28 6%. Compared with the remote sensing data in the same time, it was found that the weekening function of air on the two tunnels are 5.2% and 7.5% separately. (2) Under clear air condition, the reflective ratio of near infrared tunnel is greater than that of visible tunnel on each position of sand dune and the maximum increase value appears on fall sand slope and left wing, that is about 4.3%. At different positions of sand dune, the change of reflective ratio within visible tunel is less, that within near infrared tunnel is bigger, and the maximum change of the latter is about five times as much as that of the former. The reflective ratios within visible and near infrared tunnels on slope toward sunlight are slightly greater than that on shadow slope. (3) Among clear air, cloudy sky and overcast sky, the maximum of reflective ratio within visible and near infrared tunnels appears in overcast sky. From clear air through cloudy sky to overcast sky, the NDVI value, the difference between reflective ratios within visible and near infrared tunnels and the maximum difference of reflective ratios on visible tunnel at different positions of sand dune decrease in turn, but the maximum difference of reflective ratio within near infrared tunnel at different positions of sand dune increases. (4) In relative clear day, the reflective ratios within visible and near infrared tunnels over dune all decrease with increasing of solar altitude angle, and the former has larger anticorrelation coefficient with solar altitude angle. (5) Frost can increase reflective ratios of visible and near infrared tunnels. Compared with frost free day, the reflective ratio of visible tunnel increase about 2 6% and that of near infrared increase about 3 5%. |
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| Keywords: | Taklimakan\ Desert hinterland\ Winter\ Reflection of desert surface\ Spactrum features |
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