浮尘气溶胶对沙漠大气边界层结构作用的昼夜差异

doi:10.13866/j.azr.2022.04.03

Abstract

Abstract:

Based on data from four-times-daily intensive sounding and ground meteorological observations in the hinterland of the Taklamakan Desert in July 2016, this paper compares the structures in the atmospheric boundary layer and differences in surface radiation budget on sunny days and days with high amounts of floating dust (“floating dust days”) to reveal the diurnal change in the effect of floating dust aerosols on the structure of the atmospheric boundary layer and its underlying mechanism. The results show that the height of the stable boundary layer at night on a sunny day and a floating dust day is 270 m and 360 m, respectively. The stable boundary layer inversion intensity on a sunny day reaches 3.1 K·（100m）^-1, which is stronger than 1.6 K·（100m）^-1 on a floating dust day. The convective boundary layer height is close to 3600 m on a sunny day and only 2700 m on a floating dust day. The downward long-wave radiation of floating dust aerosols at night weakens the radiative cooling of the surface, raises the height of stable boundary layer, and weakens its stability. In the daytime, the strong solar short-wave net radiation heats the desert surface, and its strong sensible heat creates an ultrahigh convective atmospheric boundary layer. Floating dust aerosol significantly reduces the surface short-wave radiation and sensible heating and reduces the height of the convective boundary layer during the day. The unique radiation effect of floating dust aerosols in the Tarim Basin has opposite influences on the structure of the atmospheric boundary layer during the day and night.

Key words: Taklamakan Desert, structure of atmospheric boundary layer, radiative forcing of floating dust, diurnal change

ZHU Congzhen,ZHAO Tianliang,MENG Lu,YANG Xinghua,HE Qing,Ali MAMTIMIN,YANG Jie,ZHU Yan,WU Zhaoye. Different diurnal effects of floating dust on the structures in the atmospheric boundary layer over desert areas[J].Arid Zone Research, 2022, 39(4): 1017-1026.

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References 35

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	01：15	07：15	01：15	07：15	13：15	19：15
	稳定边界层顶/m		残留混合层顶/m		对流边界层顶/m
晴日	220	290	3340	3060	2490	3580
浮尘日	270	460	2800	2430	2220	2710

	01：15	07：15	01：15	07：15
	低空急流风速/(m·s^-1)		低空急流高度/m
晴日	8.6	10.4	230	300
浮尘日	8.1	6.1	300	490

	向下短波辐射/(MJ·m^-2)		向上短波辐射/(MJ·m^-2)		向下长波辐射/(MJ·m^-2)		向上长波辐射/(MJ·m^-2)		净辐射/(MJ·m^-2)
	白天	夜晚	白天	夜晚	白天	夜晚	白天	夜晚	白天	夜晚
晴日	28.04	0	7.02	0	20.95	11.50	31.20	13.99	10.77	-2.49
浮尘日	23.87	0	6.02	0	21.56	12.73	30.76	14.30	8.65	-1.57

Different diurnal effects of floating dust on the structures in the atmospheric boundary layer over desert areas

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