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Correcting model biases of CO in East Asia: impact on oxidant distributions...

Gaubert, B., L. Emmons, K. Raeder, S. Tilmes, K. Miyazaki, A. Arellano, N. Elguindi, C. Granier, W. Tang, J. Barré, H. Worden, R. Buchholz, D. Edwards, P. Franke, J. L. Anderson, M. Saunois, J. R. Schroeder, J. H. Woo, I. J. Simpson, D. R. Blake, S. Meinardi, P. Wennberg, J. D. Crounse, A. Teng, M. Kim, R. Dickerson, H. He, X. Ren, S. E. Pusede, and G. S. Diskin (2020), Correcting model biases of CO in East Asia: impact on oxidant distributions during KORUS-AQ, Atmos. Chem. Phys., 20, 14617-14647, doi:10.5194/acp-20-14617-2020.

Global coupled chemistry–climate models underestimate carbon monoxide (CO) in the Northern Hemisphere, exhibiting a pervasive negative bias against measurements peaking in late winter and early spring. While this bias has been commonly attributed to underestimation of direct anthropogenic and biomass burning emissions, chemical production and loss via OH reaction from emissions of anthropogenic and biogenic volatile organic compounds (VOCs) play an important role. Here we investigate the reasons for this underestimation using aircraft measurements taken in May and June 2016 from the Korea–United States Air Quality (KORUS-AQ) experiment in South Korea and the Air Chemistry Research in Asia (ARIAs) in the North China Plain (NCP). For reference, multispectral CO retrievals (V8J) from the Measurements of Pollution in the Troposphere (MOPITT) are jointly assimilated with meteorological observations using an ensemble adjustment Kalman filter (EAKF) within the global Community Atmosphere Model

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