Abstract:

The surface temperature is much different at different positions of sand dune or even same position but at different time or different weather condition The temperature features are discussed based on observations at different position of  sand dune on clear or sand-dust day, bare land or different vegetation cover. The daily maximum surface temperature appears on the coping of the sand dune, the minimum temperature and the greatest diurnal temperature range appear on the windward slop.The coping and windward slop of sand dune have the greatest diurnal temperature range, but the leeward slop is contrary.The daily variation of surface temperature is larger on clear day than that under dust weather condition on the coping, windward slop, leeward slop and at the left wing. The time of the maximum and minimum temperature at 20 cm depth of the windward slop and the leeward slop is contrary to that of the surface temperature under clear or dust weather condition. From 0 to 20 cm depth of the windward and leeward slop, the diurnal temperature range is gradually decreasing, the time of the maximum and minimum temperature is different on clear day and dust weather, and the daytime temperature difference is large on clear day or dust weather condition.The surface temperature of vegetation cover and bare land have biggish variation. The daily variation is larger in sunniness cover than that of shade cover of vegetation.

摘要：

塔克拉玛干沙漠腹地沙丘温度因不同类型、深度、部位、天气、时段差异很大。利用不同深度、部位，晴天和沙尘天，裸地与植被，不同植被下的温度观测，浅析其温度分布特征。沙丘表面日最高温出现在顶部，日最低温和日较差最大值出现在迎风坡。沙丘顶部和迎风坡升温快，降温也快，日较差大，落沙坡则相反。沙丘顶部、左翼、迎风坡和落沙坡，日变化振幅，浮尘、扬沙天小于晴天。迎风坡和落沙坡20 cm深度，晴天和沙尘天最高最低温度出现时间和沙表层有相反趋势。0-20 cm迎风坡和落沙坡日较差逐渐减小，最高与最低温度出现时间，晴天和沙尘天不同，晴天和沙尘天温度差值在白天较大。裸地和植被表层沙面温度变化较大，植被阴面日变化振幅小于裸地和植被阳面。裸地和植被浅层温度变化平缓。红柳和芦苇所在沙堆表层温度日变化较大，梭梭的日变化小，温度最低值均出现在07时。

关键词: 塔克拉玛干沙漠, 沙丘, 温度