塔克拉玛干沙漠腹地秋季陆面过程特征

doi:10.7522/j.issn.1000-694X.2018.00152

摘要/Abstract

摘要： 利用塔克拉玛干沙漠腹地塔中2014年10月的秋季涡动通量数据，分析了塔中秋季陆面过程通量变化特征。结果表明：（1）塔中秋季10月净辐射R_n、感热通量H、潜热通量LE、地表土壤热通量G₀峰值依次为273.0、141.6、5.0、105.0 W·m^-2，平均日总量依次为2.85、2.68、0.08、-0.57 MJ·m^-2，净辐射能量分配以感热能量输送为主。（2）不同典型天气下，净辐射日总量扬沙>晴天>阴天>降水；阴天、扬沙天气H随R_n不同程度削减而减少，降水天气潜热增多导致日变化特征有别于其他天气。（3）10月能量闭合率为79.0%，不同天气能量闭合率阴天>晴天>扬沙>降水，依次为86.8%、83.4%、79.4%、71.4%。（4）地表反照率晴天呈“U”型变化，阴天和扬沙天气地表反照率趋势变缓发生波动现象，降水天气波动较大，趋势先降低后回升。（5）月平均热通量日间为正值，夜间为负值。日间能量闭合率为73.9%，夜间为50.8%，存在较高的能量不闭合。

关键词: 塔克拉玛干沙漠, 塔中, 秋季, 陆面过程

Abstract: Based on the eddy covariance flux data in Tazhong, middle part of the Taklimakan Desert, that collected in the autumn, October,2014, we analyzed the characteristics of land surface process flux variation. The result shows, the peak values of R_n, H, LE and G₀ are 273.0, 141.6, 5.0, 105.0 W·m^-2 respectively in October in Tazhong. The average daily total amount is 2.85, 2.68, 0.08, -0.57 MJ·m^-2 and the net radiation energy partitioning is dominated by sensible heat energy transfer. Under the different typical weather, the total amount of net radiation is variable in blowing-sand>sunny>cloudy>precipitation weather. H decreases with declining degrees of R_n during cloudy and blowing-sand weather, and the daily variation characteristics caused by the increase of latent heat in the precipitation weather are different from other weathers. The energy balance closure ratio is 79.0% in October, and it is changeable in cloudy>sunny>blowing-sand>precipitation weather, with 86.8%, 83.4%, 79.4%, 71.4% respectively. The surface albedo has a "U"-type change on sunny days. In cloudy and blowing-sand weather, the surface albedo trend slows down and fluctuates, and in precipitation weather it fluctuates first and then rises. The monthly average heat fluxes shows positive during the day and negative at night. The daytime energy balance closure ratio is 73.9%, and is only 50.8% during the night, so there is a higher energy that does not closed.

Key words: Taklimakan Desert, Tazhong, autumn, land surface processes

中图分类号:

P422

赵佳伟, 何清, 金莉莉, 李振杰, 买买提艾力·买买提依明, 张建涛. 塔克拉玛干沙漠腹地秋季陆面过程特征[J]. 中国沙漠, 2019, 39(4): 159-167.

Zhao Jiawei, He Qing, Jin Lili, Li Zhenjie, Ali Mamtimin, Zhang Jiantao. Characteristics of Land Surface Processes in the Hinterland of Taklimakan Desert in Autumn[J]. Journal of Desert Research, 2019, 39(4): 159-167.

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