气候变化领域集成服务门户(CCPortal): Evaluation of climate model aerosol trends with ground-based observations over the last 2 decades

CCPortal

DOI	10.5194/acp-20-13355-2020
	Evaluation of climate model aerosol trends with ground-based observations over the last 2 decades - an AeroCom and CMIP6 analysis
	Mortier A.; Gliß J.; Schulz M.; Aas W.; Andrews E.; Bian H.; Chin M.; Ginoux P.; Hand J.; Holben B.; Zhang H.; Kipling Z.; Kirkevåg A.; Laj P.; Lurton T.; Myhre G.; Neubauer D.; Olivié D.; von Salzen K.; Skeie R.B.; Takemura T.; Tilmes S.
发表日期	2020
ISSN	16807316
起始页码	13355
结束页码	13378
卷号	20 期号:21
英文摘要	This study presents a multiparameter analysis of aerosol trends over the last 2 decades at regional and global scales. Regional time series have been computed for a set of nine optical, chemical-composition and mass aerosol properties by using the observations from several ground-based networks. From these regional time series the aerosol trends have been derived for the different regions of the world. Most of the properties related to aerosol loading exhibit negative trends, both at the surface and in the total atmospheric column. Significant decreases in aerosol optical depth (AOD) are found in Europe, North America, South America, North Africa and Asia, ranging from −1.2 % yr−1 to −3.1 % yr−1. An error and representativity analysis of the spatially and temporally limited observational data has been performed using model data subsets in order to investigate how much the observed trends represent the actual trends happening in the regions over the full study period from 2000 to 2014. This analysis reveals that significant uncertainty is associated with some of the regional trends due to time and space sampling deficiencies. The set of observed regional trends has then been used for the evaluation of 10 models (6 AeroCom phase III models and 4 CMIP6 models) and the CAMS reanalysis dataset and of their skills in reproducing the aerosol trends. Model performance is found to vary depending on the parameters and the regions of the world. The models tend to capture trends in AOD, the column Ångström exponent, sulfate and particulate matter well (except in North Africa), but they show larger discrepancies for coarse-mode AOD. The rather good agreement of the trends, across different aerosol parameters between models and observations, when co-locating them in time and space, implies that global model trends, including those in poorly monitored regions, are likely correct. The models can help to provide a global picture of the aerosol trends by filling the gaps in regions not covered by observations. The calculation of aerosol trends at a global scale reveals a different picture from that depicted by solely relying on ground-based observations. Using a model with complete diagnostics (NorESM2), we find a global increase in AOD of about 0.2 % yr−1 between 2000 and 2014, primarily caused by an increase in the loads of organic aerosols, sulfate and black carbon. © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License.
语种	英语
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/143823
作者单位	Research Department, Norwegian Meteorological Institute, Oslo, Norway; Atmosphere and Climate Department, NILU, Norwegian Institute for Air Research, Kjeller, Norway; Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, United States; Joint Center for Earth Systems Technology, University of Maryland, Baltimore County (UMBC), Baltimore, MD, United States; NASA Goddard Space Flight Center, Greenbelt, MD, United States; Geophysical Fluid Dynamics Laboratory, NOAA, Princeton, NJ, United States; Cooperative Institute for Research in the Atmosphere, Colorado State University, Fort Collins, CO, United States; Laboratory for Climate Studies, National Climate Center, China Meteorological Administration, Beijing, China; European Centre for Medium-Range Weather Forecasts, Reading, United Kingdom; Institute for Geosciences and Environmental Research, Université Grenoble Alpes, CNRS, IRD, Grenoble INP, Grenoble, France; Met Office Hadley Centre, Exeter, United Kingdom; CIC...
推荐引用方式 GB/T 7714	Mortier A.,Gliß J.,Schulz M.,et al. Evaluation of climate model aerosol trends with ground-based observations over the last 2 decades - an AeroCom and CMIP6 analysis[J],2020,20(21).
APA	Mortier A..,Gliß J..,Schulz M..,Aas W..,Andrews E..,...&Tilmes S..(2020).Evaluation of climate model aerosol trends with ground-based observations over the last 2 decades - an AeroCom and CMIP6 analysis.Atmospheric Chemistry and Physics,20(21).
MLA	Mortier A.,et al."Evaluation of climate model aerosol trends with ground-based observations over the last 2 decades - an AeroCom and CMIP6 analysis".Atmospheric Chemistry and Physics 20.21(2020).