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Constraining black carbon aerosol over Asia using OMI aerosol absorption optical depth and the adjoint of GEOS-Chem
Zhang, L.1,2; Henze, D. K.1; Grell, G. A.2; Carmichael, G. R.3; Bousserez, N.1; Zhang, Q.4; Torres, O.5; Ahn, C.6; Lu, Z.7; Cao, J.8; Mao, Y.9,10

Accurate estimates of the emissions and distribution of black carbon (BC) in the region referred to here as Southeastern Asia (70-150A degrees E, 11A degrees S-55A degrees N) are critical to studies of the atmospheric environment and climate change. Analysis of modeled BC concentrations compared to in situ observations indicates levels are underestimated over most of Southeast Asia when using any of four different emission inventories. We thus attempt to reduce uncertainties in BC emissions and improve BC model simulations by developing top-down, spatially resolved, estimates of BC emissions through assimilation of OMI (Ozone Monitoring Instrument) observations of aerosol absorption optical depth (AAOD) with the GEOS-Chem (Goddard Earth Observing System - chemistry) model and its adjoint for April and October 2006. Overwhelming enhancements, up to 500 %, in anthropogenic BC emissions are shown after optimization over broad areas of Southeast Asia in April. In October, the optimization of anthropogenic emissions yields a slight reduction (1-5 %) over India and parts of southern China, while emissions increase by 10-50 % over eastern China. Observational data from in situ measurements and AERONET (Aerosol Robotic Network) observations are used to evaluate the BC inversions and assess the bias between OMI and AERONET AAOD. Low biases in BC concentrations are improved or corrected in most eastern and central sites over China after optimization, while the constrained model still underestimates concentrations in Indian sites in both April and October, possibly as a consequence of low prior emissions. Model resolution errors may contribute up to a factor of 2.5 to the underestimation of surface BC concentrations over northern India. We also compare the optimized results using different anthropogenic emission inventories and discuss the sensitivity of top-down constraints on anthropogenic emissions with respect to biomass burning emissions. In addition, the impacts of brown carbon, the formulation of the observation operator, and different a priori constraints on the optimization are investigated. Overall, despite these limitations and uncertainties, using OMI AAOD to constrain BC sources improves model representation of BC distributions, particularly over China.

WOS HeadingsScience & Technology ; Physical Sciences
WOS KeywordOzone Monitoring Instrument ; Fine Particulate Matter ; Sky Radiance Measurements ; Light-absorption ; Spatial-distribution ; Airborne Particles ; Size Distribution ; Elemental Carbon ; High-resolution ; Satellite Data
Indexed BySCI
WOS Research AreaMeteorology & Atmospheric Sciences
WOS SubjectMeteorology & Atmospheric Sciences
WOS IDWOS:000362457400005
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Document Type期刊论文
Corresponding AuthorHenze, D. K.
Affiliation1.Univ Colorado, Dept Mech Engn, Boulder, CO 80309 USA
2.NOAA, Global Syst Div, Earth Syst Res Lab, Boulder, CO USA
3.Univ Iowa, Dept Chem & Biochem Engn, Iowa City, IA 52242 USA
4.Tsinghua Univ, Ctr Earth Syst Sci, Beijing 100084, Peoples R China
5.NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
6.Sci Syst & Applicat Inc, Lanham, MD USA
7.Argonne Natl Lab, Div Energy Syst, Argonne, IL 60439 USA
8.Chinese Acad Sci, Key Lab Aerosol Chem & Phys, Inst Earth Environm, Xian, Peoples R China
9.Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA USA
10.Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Atmospher Boundary Layer Phys & Atm, Beijing, Peoples R China
Recommended Citation
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Zhang, L.,Henze, D. K.,Grell, G. A.,et al. Constraining black carbon aerosol over Asia using OMI aerosol absorption optical depth and the adjoint of GEOS-Chem[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2015,15(18):10281-10308.
APA Zhang, L..,Henze, D. K..,Grell, G. A..,Carmichael, G. R..,Bousserez, N..,...&Mao, Y..(2015).Constraining black carbon aerosol over Asia using OMI aerosol absorption optical depth and the adjoint of GEOS-Chem.ATMOSPHERIC CHEMISTRY AND PHYSICS,15(18),10281-10308.
MLA Zhang, L.,et al."Constraining black carbon aerosol over Asia using OMI aerosol absorption optical depth and the adjoint of GEOS-Chem".ATMOSPHERIC CHEMISTRY AND PHYSICS 15.18(2015):10281-10308.
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