2003—2019年新疆气溶胶光学厚度时空变化特征

doi:10.12118/j.issn.1000–6060.2021.221

Abstract

Abstract:

Aerosol optical depth (AOD) is the integration of the aerosol extinction coefficient in the vertical direction, which is an important indicator of air pollution. Based on the MODIS Aqua Aerosol L2 products, the temporal and spatial variation characteristics of AOD in Xinjiang, China from 2003 to 2019 were analyzed. First, the MODIS AOD was verified based on the Chinese Aerosol Optical Property Network AOD data, with a correlation coefficient of 0.6381 and an expected error of 65%. Then, the Spearman rank correlation test was used to analyze the annual mean variation of AOD, and 14 main AOD regions were extracted to analyze the annual linear trend. The results show that the climatology of AOD presents obvious regional characteristics in Xinjiang, with higher values over southern Xinjiang than northern Xinjiang. The AOD center located over the Tarim Basin, with mean values exceeding 0.6, is highly related to dust weather. The AOD center located along the economic belt of the north slope of the Tianshan Mountains, with an average value of about 0.3, is mainly affected by human economic activities. Therefore, natural and anthropogenic aerosols are responsible for the air pollution in Xinjiang. In terms of seasonal change, AOD is the most in spring (0.45); however, it is the least in autumn (0.15). Furthermore, the seasonal change in AOD in southern Xinjiang is more significant than in northern Xinjiang for the dust weather. The monthly mean AOD increases from January to April and decreases from May to December, with a range of 0.11-0.51. For the long-term trend, the AOD shows an increasing tendency in the economic belt of the north slope of the Tianshan Mountains and decreasing tendency in desert regions.

Key words: MODIS, aerosol optical depth (AOD), sun photometer, distribution characteristics, variation trend

YU Zhixiang,LI Xia,YU Xiaojing,ZHENG Yu,Manlen AYITKEN,LI Shuting,WANG Nan. Spatiotemporal variation characteristics of aerosol optical depth in Xinjiang from 2003 to 2019[J].Arid Land Geography, 2022, 45(2): 346-358.

Figures/Tables 10

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Tab. 1

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Tab. 2

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地区	春季		夏季		秋季		冬季		年均值
地区	均值	方差	均值	方差	均值	方差	均值	方差	均值	方差
伊宁市	0.31	0.0024	0.27	0.0003	0.19	0.0009	0.15	0.0080	0.25	0.0008
博乐市	0.21	0.0015	0.32	0.0020	0.26	0.0024	0.22	0.0182	0.27	0.0008
独奎乌地区	0.33	0.0038	0.36	0.0011	0.25	0.0044	0.28	0.0275	0.31	0.0015
石河子市	0.37	0.0036	0.39	0.0009	0.28	0.0041	0.26	0.0169	0.35	0.0024
乌昌地区	0.29	0.0024	0.34	0.0012	0.24	0.0017	0.14	0.0069	0.29	0.0013
吐鲁番盆地	0.46	0.0213	0.22	0.0023	0.21	0.0028	0.26	0.0061	0.29	0.0035
焉耆盆地	0.54	0.0100	0.35	0.0023	0.24	0.0020	0.27	0.0221	0.36	0.0023
库沙新地区	0.75	0.0345	0.51	0.0090	0.29	0.0058	0.23	0.0065	0.48	0.0043
阿克苏市	0.84	0.0353	0.53	0.0130	0.31	0.0103	0.26	0.0057	0.53	0.0054
喀什市	0.80	0.0348	0.47	0.0081	0.31	0.0095	0.17	0.0049	0.48	0.0036
叶尔羌河流域	0.80	0.0310	0.49	0.0083	0.28	0.0097	0.18	0.0049	0.46	0.0034
和田市	0.79	0.0265	0.58	0.0097	0.24	0.0050	0.18	0.0114	0.47	0.0026
民丰地区	0.82	0.0206	0.69	0.0170	0.24	0.0036	0.22	0.0039	0.50	0.0027
若羌地区	0.93	0.0154	0.61	0.0121	0.25	0.0032	0.26	0.0090	0.52	0.0030

地区	相关系数（r）	变化趋势	显著性
伊宁市	0.388	上升	不显著
博乐市	0.459	上升	不显著
独奎乌地区	0.435	上升	不显著
石河子市	0.662	上升	显著
乌昌地区	0.503	上升	显著
吐鲁番盆地	-0.249	下降	不显著
焉耆盆地	0.033	上升	不显著
库沙新地区	-0.118	下降	不显著
阿克苏市	-0.206	下降	不显著
喀什市	-0.292	下降	不显著
叶尔羌河流域	-0.371	下降	不显著
和田市	-0.223	下降	不显著
民丰地区	0.103	上升	不显著
若羌地区	0.046	上升	不显著

Spatiotemporal variation characteristics of aerosol optical depth in Xinjiang from 2003 to 2019

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