DOI: 10.1002/jgrd.50867
论文题名: Comparison of GEOS-Chem aerosol optical depth with AERONET and MISR data over the contiguous United States
作者: Li S. ; Garay M.J. ; Chen L. ; Rees E. ; Liu Y.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 19 起始页码: 11228
结束页码: 11241
语种: 英语
英文关键词: AERONET
; AOD
; GEOS-Chem
; MISR
Scopus关键词: Atmospheric aerosols
; Dust
; Optical properties
; AERONET
; Aerosol optical property
; Aerosol robotic networks
; AOD
; GEOS-Chem
; Goddard earth observing systems
; MISR
; Multiangle imaging spectroradiometer
; Atmospheric movements
; absorption
; aerosol
; comparative study
; depth determination
; error analysis
; MISR
; optical property
; regression analysis
; robotics
; seasonal variation
; uncertainty analysis
; United States
英文摘要: Aerosol optical properties simulated by the global 3-D tropospheric chemistry and transport model Goddard Earth Observing System (GEOS)-Chem (GC) from 2008 to 2010 over the contiguous United States were evaluated with ground observations from Aerosol Robotic Network (AERONET) sites and aerosol products reported by the Multiangle Imaging Spectroradiometer (MISR). Overall, the correlation coefficient (r) and regression slope between AERONET and GC 2° × 2.5° (2° latitude × 2.5° longitude) daily total column aerosol optical depth (AOD) were 0.6 and 0.51, respectively. After using the nested GC0.5° × 0.667° model to control for spatial variability, removing several outliers, and averaging over a monthly timescale, the agreement was significantly improved to an r of 0.84 and a slope of 0.75. Seasonal, hourly, and geographical statistics for GC 0.5° × 0.667° and AERONET AODs show a similar data range and variation, with higher mean values in the summer, the evening, and in the eastern U.S. Smaller correlation coefficients are seen in the summer and winter, in the evening, and in the western U.S. To investigate the optical properties of major GC tracers, MISR level 2 aerosol products were used to calculate inorganic aerosol, dust, and absorbing non-dust AOD. Both GC and MISR suggest that on average, inorganic aerosol has the highest AOD (GC: 0.071, MISR: 0.089) nationally, followed by absorbing non-dust species (GC: 0.025, MISR: 0.041), and dust (GC: 0.013, MISR: 0.014). The large discrepancies in our intercomparison are due to GC underestimation of inorganic aerosol levels during all four seasons in the western U.S. and dust during summer in the eastern U.S., along with overestimation of summertime-absorbing non-dust species over the northwestern U.S. These uncertainties are attributed to underestimation of inorganic aerosol emissions in more polluted western regions, the transport of Sahara dust in the summer, misuse of the fire files, MISR retrieval uncertainties in the surface, and choice of aerosol models. Key Points GEOS-Chem simulated AODs are evaluated with AERONET and MISR in the U.S. Monthly mean AERONET and nested GEOS-Chem AODs are well correlated GC bias in inorganic aerosols and MISR errors contribute to the differences ©2013. American Geophysical Union. All Rights Reserved. 资助项目: 41101400
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63285
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: State Key Laboratory of Remote Sensing Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing, China; Rollins School of Public Health, Emory University, 1518 Clifton Road NE, Atlanta, GA 30322, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena CA, United States
Recommended Citation:
Li S.,Garay M.J.,Chen L.,et al. Comparison of GEOS-Chem aerosol optical depth with AERONET and MISR data over the contiguous United States[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(19)