塔里木南缘绿洲“冷岛”效应时空变化研究——以于田地区为例

 利用遥感技术，选取研究区TM/ETM热红外波段，反演了塔里木盆地南缘绿洲于田地区1989年、1999年、2002年的陆表温度（LST），构建了绿洲“冷岛”比例指数（OCRI），定量分析了于田地区14 a来，绿洲内部“冷岛”效应的时序变化，指出于田绿洲“冷岛”效应有减弱的趋势;并且通过对于田温度场的分析，总结了“冷岛”效应空间变化的特点：①于田县绿洲内外部温度差异变小，温度波动趋缓，“冷岛”效应减弱;②于田县城建成区面积的扩大减弱了“热岛”效应的强度和范围。

Spatial-Temporal Change of "Cool Island" Effect in Southern Tarim Basin: A Case Study in Yutian Oasis

“Cool island” effect is a major aspect in oasis effect. This thesis has retrieved the Land Surface Temperature (LST) of Yutian area in the southern marginal zone of Tarim Basin in 1989, 1999 and 2002; constructed the Oasis-Cold-Island Ratio Index; established the west to east and the north to south temperature profiles taking the Yutian county as the centre; has quantitatively analyzed the spatial-temporal change of “cool island” effect in interior Yutian oasis for 14 years; pointed out “the cool island effect” has the weaker tendency in Yutian oasis; and through the analysis to Yutian temperature field, summarized the representation aspects of the space variation of “the cool island effect”: ①the expansion of Yutian county has weakened the intensity and the scope of “cool island effect”; ②in Yutian county, the interior temperature gradient changes slightly and the temperature fluctuation becomes slower.