干旱区生态环境知识资源中心(Arid): 塔克拉玛干沙漠西南缘大气气溶胶光学特性

Arid

	塔克拉玛干沙漠西南缘大气气溶胶光学特性
其他题名	On the Aerosol Optical Properties at the Southwestern Margin of Taklimakan Desert
	于杰 1; 陈权亮 1; 车慧正 2
来源期刊	干旱区研究
ISSN	1001-4675
出版年	2015
卷号	32 期号:5 页码:983-990
中文摘要	利用2002年5月至2005年3月和田地区CE318太阳光度计观测资料,反演440 nm、675 nm、870 nm和1 020 nm 4个波段气溶胶光学厚度(AOD)以及440~870 nm波长指数,并对气溶胶光学特性参数进行了滤云处理及数据质量控制,进而分析了塔克拉玛干沙漠西南缘地区气溶胶光学特性。研究表明:AOD的频率呈双峰分布,峰值中心分别位于0.310.007和0.640.11;波长指数的频率分布与AOD类似,也呈双峰分布,拟合相关系数R~2=0.99,峰值中心分别在0.120.002和0.330.022,其中超过50%的波长指数集中在以0.12为中心的波峰附近。从季节变化来看,和田地区气溶胶光学特性存在明显的季节变化特征,全年平均光学厚度达到0.610.35,AOD在春夏季高,秋冬季低;波长指数则春夏季低,秋冬季相对较高。AOD最大值出现在5月(0.810.48)和8月(0.810.39),最小值则出现在11月(0.310.12);波长指数的最大值和最小值分别出现在1月(0.660.26)和5月(0.060.06)。AOD(波长指数)的日变化呈现出早晚高(低),白天比较稳定的特征。从年平均变化来看,2002-2004年AOD和波长指数分别在0.57~0.60和0.22~0.23,比较稳定,无明显的年变化特征。AOD和波长指数的相互关系分析表明,波长指数随AOD的增加呈降低的趋势,说明粒径较大的沙尘粒子对高AOD贡献较大。研究结果显示,和田地区光学特性主要呈现出典型的沙漠气溶胶特点,人为活动产生的气溶胶对该地区气溶胶光学特性影响很小。
英文摘要	In this paper,aerosol optical depths (AODs) at four Angstroms of 440,675,870,1 020 nm and Angstrom exponent between 440 nm and 870 nm are retrieved based on the observations of CE318 sun photometer from May 2002 to March 2005 at Hetian station. After making cloud screening and data quality controlling of these retrieved optical parameters, the aerosol optical properties over the southwestern margin of Taklimakan Desert are analyzed. The results show as follows: the frequency distribution of AOD can be well fitted by a bi-mode normal distribution centered about 0.31 and 0.64 with the standard deviation of 0.007 and 0.11, respectively. The frequency distribution of Angstrom exponent can be well fitted (R~2 = 0.99) by a bi-mode normal distribution centered about 0.12 and 0.33 with the standard deviation of 0.002 and 0.022, respectively. And more than half of the Angstro m exponent data are concentrated around the peak whose center is 0.12. There is obvious seasonal variation trend of aerosol optical properties at Hetian. The annual average AOD at 440 nm reaches about 0.61 with the standard deviation of 0.35. AODs are high in spring and summer but low in autumn and winter. Angstrom exponent are low in spring and summer but relatively high in autumn and winter. The maximum AOD occurs in May with a value of 0.81 0.48,and the minimum in November with a value of 0.31 0.12. The maximum and minimum Angstrom exponent occur in January with a value of 0.66 0.26 and May with a value of 0.06 0.06, respectively. The diurnal variation of AOD (Angstrom exponent) shows the characteristic of high (low) values in the morning and evening, a nd is relatively constant during the daytime. The annual averaged AOD and Angstrom exponent are relatively stable with the values around 0.57 - 0.60 and 0.22 - 0.23, respectively; however, there is no significant annual variability during 2002 - 2004. The relationship between AOD and Angstrom exponent shows obvious pattern of decreasing Angstro m exponent with increasing AOD,which indicates the dust aerosol of larger particle size are the major contributions to the high AOD. Compared with the existing study results,one can see that the aerosol optical properties at Hetian show the typical desert aerosol characteristics,while anthropogenic aerosols have little effect on the aerosol optical properties of this region.
中文关键词	大气气溶胶 ; 光学厚度(AOD) ; 波长指数 ; 塔克拉玛干沙漠
英文关键词	atmospheric aerosol AOD Angstrom exponent Taklimakan Desert
语种	中文
国家	中国
收录类别	CSCD
WOS类目	ENVIRONMENTAL SCIENCES
WOS研究方向	Environmental Sciences & Ecology
CSCD记录号	CSCD:5518759
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/232748
作者单位	1.成都信息工程学院大气科学学院, 高原大气与环境四川省重点实验室, 成都, 四川 610225, 中国; 2.中国气象科学研究院大气成分研究所, 北京 100081, 中国
推荐引用方式 GB/T 7714	于杰,陈权亮,车慧正. 塔克拉玛干沙漠西南缘大气气溶胶光学特性[J],2015,32(5):983-990.
APA	于杰,陈权亮,&车慧正.(2015).塔克拉玛干沙漠西南缘大气气溶胶光学特性.干旱区研究,32(5),983-990.
MLA	于杰,et al."塔克拉玛干沙漠西南缘大气气溶胶光学特性".干旱区研究 32.5(2015):983-990.