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DOI	10.5194/acp-19-10497-2019
	Large contribution of meteorological factors to inter-decadal changes in regional aerosol optical depth
	Che H.; Gui K.; Xia X.; Wang Y.; Holben B.N.; Goloub P.; Cuevas-Agulló E.; Wang H.; Zheng Y.; Zhao H.; Zhang X.
发表日期	2019
ISSN	16807316
起始页码	10497
结束页码	10523
卷号	19 期号:16
英文摘要	Aerosol optical depth (AOD) has become a crucial metric for assessing global climate change. Although global and regional AOD trends have been studied extensively, it remains unclear what factors are driving the inter-decadal variations in regional AOD and how to quantify the relative contribution of each dominant factor. This study used a long-term (1980-2016) aerosol dataset from the Modern- Era Retrospective Analysis for Research and Applications, version 2 (MERRA-2) reanalysis, along with two satellitebased AOD datasets (MODIS/Terra and MISR) from 2001 to 2016, to investigate the long-term trends in global and regional aerosol loading. Statistical models based on emission factors and meteorological parameters were developed to identify the main factors driving the inter-decadal changes of regional AOD and to quantify their contribution. Evaluation of the MERRA-2 AOD with the ground-based measurements of AERONET indicated significant spatial agreement on the global scale (r D0.85, root-mean-square error D0.12, mean fractional errorD38.7 %, fractional gross errorD9.86% and index of agreementD0.94). However, when AOD observations from the China Aerosol Remote Sensing Network (CARSNET) were employed for independent verification, the results showed that MERRA-2 AODs generally underestimated CARSNET AODs in China (relative mean biasD0.72 and fractional gross errorD -34:3 %). In general, MERRA-2 was able to quantitatively reproduce the annual and seasonal AOD trends on both regional and global scales, as observed by MODIS/Terra, although some differences were found when compared to MISR. Over the 37-year period in this study, significant decreasing trends were observed over Europe and the eastern United States. In contrast, eastern China and southern Asia showed AOD increases, but the increasing trend of the former reversed sharply in the most recent decade. The statistical analyses suggested that the meteorological parameters explained a larger proportion of the AOD variability (20.4 %-72.8 %) over almost all regions of interest (ROIs) during 1980- 2014 when compared with emission factors (0 %-56 %). Further analysis also showed that SO2 was the dominant emission factor, explaining 12.7 %-32.6% of the variation in AOD over anthropogenic-aerosol-dominant regions, while black carbon or organic carbon was the leading factor over the biomass-burning-dominant (BBD) regions, contributing 24.0 %-27.7% of the variation. Additionally, wind speed was found to be the leading meteorological parameter, explaining 11.8 %-30.3% of the variance over the mineraldust- dominant regions, while ambient humidity (including soil moisture and relative humidity) was the top meteorological parameter over the BBD regions, accounting for 11.7 %- 35.5% of the variation. The results of this study indicate that the variation in meteorological parameters is a key factor in determining the inter-decadal change in regional AOD. © Author(s) 2019.
语种	英语
scopus关键词	aerosol; decadal variation; humidity; optical depth; satellite data; trend analysis; wind velocity; China; United States
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/144207
作者单位	State Key Laboratory of Severe Weather (LASW), Chinese Academy of Meteorological Sciences, CMA, Beijing, 100081, China; Key Laboratory of Atmospheric Chemistry (LAC), Chinese Academy of Meteorological Sciences, CMA, Beijing, 100081, China; College of Earth and Planetary Sciences, University of Chinese, Academy of Sciences, Beijing, 100049, China; Key Laboratory for Middle Atmosphere and Global Environment Observation (LAGEO), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China; NASA Goddard Space Flight Center, Greenbelt, MD, United States; Laboratoire d'Optique Amosphérique, Université des Sciences et Technologies de Lille, Villeneuve d'Ascq, 59655, France; Centro de Investigación Atmosférica de Izaña, AEMET, Santa Cruz de Tenerife, 38001, Spain; Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University, Information Science and Technology, Nanjing, 210044, China
推荐引用方式 GB/T 7714	Che H.,Gui K.,Xia X.,et al. Large contribution of meteorological factors to inter-decadal changes in regional aerosol optical depth[J],2019,19(16).
APA	Che H..,Gui K..,Xia X..,Wang Y..,Holben B.N..,...&Zhang X..(2019).Large contribution of meteorological factors to inter-decadal changes in regional aerosol optical depth.Atmospheric Chemistry and Physics,19(16).
MLA	Che H.,et al."Large contribution of meteorological factors to inter-decadal changes in regional aerosol optical depth".Atmospheric Chemistry and Physics 19.16(2019).