Arid
DOI10.1016/j.atmosenv.2015.10.058
Trend estimates of AERONET-observed and model-simulated AOTs between 1993 and 2013
Yoon, J.1; Pozzer, A.1; Chang, D. Y.1; Lelieveld, J.1,2,3; Kim, J.4; Kim, M.4; Lee, Y. G.5; Koo, J. -H.6; Lee, J.7,8; Moon, K. J.9
通讯作者Yoon, J.
来源期刊ATMOSPHERIC ENVIRONMENT
ISSN1352-2310
EISSN1873-2844
出版年2016
卷号125页码:33-47
英文摘要

Recently, temporal changes in Aerosol Optical Thickness (AOT) have been investigated based on model simulations, satellite and ground-based observations. Most AOT trend studies used monthly or annual arithmetic means that discard details of the generally right-skewed AOT distributions. Potentially, such results can be biased by extreme values (including outliers). This study additionally uses percentiles (i.e., the lowest 5%, 25%, 50%, 75% and 95% of the monthly cumulative distributions fitted to Aerosol Robotic Network (AERONET)-observed and ECHAM/MESSy Atmospheric Chemistry (EMAC)-model simulated AOTs) that are less affected by outliers caused by measurement error, cloud contamination and occasional extreme aerosol events. Since the limited statistical representativeness of monthly percentiles and means can lead to bias, this study adopts the number of observations as a weighting factor, which improves the statistical robustness of trend estimates. By analyzing the aerosol composition of AERONET-observed and EMAC-simulated AOTs in selected regions of interest, we distinguish the dominant aerosol types and investigate the causes of regional AOT trends. The simulated and observed trends are generally consistent with a high correlation coefficient (R = 0.89) and small bias (slope +/- 2 sigma = 0.75 +/- 0.19). A significant decrease in EMAC-decomposed AOTs by water-soluble compounds and black carbon is found over the USA and the EU due to environmental regulation. In particular, a clear reversal in the AERONET AOT trend percentiles is found over the USA, probably related to the AOT diurnal cycle and the frequency of wildfires. In most of the selected regions of interest, EMAC-simulated trends are mainly attributed to the significant changes of the dominant aerosols; e.g., significant decrease in sea salt and water soluble compounds over Central America, increase in dust over Northern Africa and Middle East, and decrease in black carbon and organic carbon over Australia. (C) 2015 The Authors. Published by Elsevier Ltd.


英文关键词Aerosol optical thickness AErosol RObotic NETwork ECHAM/MESSy atmospheric chemistry model Trend estimates Monthly percentiles Monthly cumulative distributions
类型Article
语种英语
国家Germany ; Cyprus ; Saudi Arabia ; South Korea ; Canada ; USA
收录类别SCI-E
WOS记录号WOS:000367636500005
WOS关键词AEROSOL OPTICAL DEPTH ; GLOBAL FIRE EMISSIONS ; DESERT DUST ; RAIN-FOREST ; CLIMATE ; SURFACE ; REFLECTANCE ; ABSORPTION ; RESOLUTION ; ATMOSPHERE
WOS类目Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS研究方向Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
来源机构King Saud University
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/191589
作者单位1.Max Planck Inst Chem, Atmospher Chem Dept, D-55020 Mainz, Germany;
2.Cyprus Inst, CY-1645 Nicosia, Cyprus;
3.King Saud Univ, Riyadh 11451, Saudi Arabia;
4.Yonsei Univ, Dept Atmosphere Sci IEAA BK Plus 21, Seoul 120749, South Korea;
5.Chungnam Natl Univ, Res Inst Basic Sci, Daejeon, South Korea;
6.Univ Toronto, Dept Phys, Toronto, ON, Canada;
7.Univ Maryland, Earth Syst Sci Interdisciplinary Ctr, College Pk, MD 20742 USA;
8.NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA;
9.NIER, Inchon, South Korea
推荐引用方式
GB/T 7714
Yoon, J.,Pozzer, A.,Chang, D. Y.,et al. Trend estimates of AERONET-observed and model-simulated AOTs between 1993 and 2013[J]. King Saud University,2016,125:33-47.
APA Yoon, J..,Pozzer, A..,Chang, D. Y..,Lelieveld, J..,Kim, J..,...&Moon, K. J..(2016).Trend estimates of AERONET-observed and model-simulated AOTs between 1993 and 2013.ATMOSPHERIC ENVIRONMENT,125,33-47.
MLA Yoon, J.,et al."Trend estimates of AERONET-observed and model-simulated AOTs between 1993 and 2013".ATMOSPHERIC ENVIRONMENT 125(2016):33-47.
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