A regional scale modeling analysis of aerosol and trace gas distributions over the eastern Pacific during the INTEX-B field campaign

作者：B. Adhikary, Gregory R. Carmichael, S. Kulkarni, Chao Wei, Youhua Tang, A. D’Allura, Marcelo Mena‐Carrasco, David G. Streets, Q. Zhang, R. Bradley Pierce, J. A. Al‐Saadi, L. K. Emmons, Gabriele Pfister, M. A. Avery, J. D. Barrick, D. R. Blake, W. H. Brune, R. C. Cohen, Jack E. Dibb, Alan Fried, Brian G. Heikes, L. G. Huey, Daniel W. O’Sullivan, G. W. Sachse, R. E. Shetter, H. B. Singh, T. Campos, C. A. Cantrell, F. Flocke, E. J. Dunlea, J. L. Jiménez, A. J. Weinheimer, John D. Crounse, P. O. Wennberg, James J. Schauer, Elizabeth A. Stone, Daniel A. Jaffe, D. R. Reidmiller · 发表于：Atmospheric chemistry and physics · 年份：2010 · DOI：10.5194/acp-10-2091-2010 · 被引用次数：44 · 研究领域：Atmospheric chemistry and aerosols、Atmospheric Ozone and Climate、Atmospheric aerosols and clouds

Abstract. The Sulfur Transport and dEposition Model (STEM) is applied to the analysis of observations obtained during the Intercontinental Chemical Transport Experiment-Phase B (INTEX-B), conducted over the eastern Pacific Ocean during spring 2006. Predicted trace gas and aerosol distributions over the Pacific are presented and discussed in terms of transport and source region contributions. Trace species distributions show a strong west (high) to east (low) gradient, with the bulk of the pollutant transport over the central Pacific occurring between ~20° N and 50° N in the 2–6 km altitude range. These distributions are evaluated in the eastern Pacific by comparison with the NASA DC-8 and NSF/NCAR C-130 airborne measurements along with observations from the Mt. Bachelor (MBO) surface site. Thirty different meteorological, trace gas and aerosol parameters are compared. In general the meteorological fields are better predicted than gas phase species, which in turn are better predicted than aerosol quantities. PAN is found to be significantly overpredicted over the eastern Pacific, which is attributed to uncertainties in the chemical reaction mechanisms used in current atmospheric chemistry models in general and to the specifically high PAN production in the SAPRC-99 mechanism used in the regional model. A systematic underprediction of the elevated sulfate layer in the eastern Pacific observed by the C-130 is another issue that is identified and discussed. Results from source re...