globalchange  > 影响、适应和脆弱性
DOI: 10.1002/jgrd.503802013
TransCom model simulations of methane: Comparison of vertical profiles with aircraft measurements
Author: Saito R.; Patra P.K.; Sweeney C.; Machida T.; Krol M.; Houweling S.; Bousquet P.; Agusti-Panareda A.; Belikov D.; Bergmann D.; Bian H.; Cameron-Smith P.; Chipperfield M.P.; Fortems-Cheiney A.; Fraser A.; Gatti L.V.; Gloor E.; Hess P.; Kawa S.R.; Law R.M.; Locatelli R.; Loh Z.; Maksyutov S.; Meng L.; Miller J.B.; Palmer P.I.; Prinn R.G.; Rigby M.; Wilson C.
Source Publication: Journal of Geophysical Research Atmospheres
ISSN: 21698996
Publishing Year: 2013
Volume: 118, Issue:9
pages begin: 3891
pages end: 3904
Language: 英语
Scopus Keyword: Aircraft ; Atmospheric chemistry ; Chemical analysis ; Inverse problems ; Methane ; Troposphere ; Aircraft measurement ; Chemistry transport model ; Correlation coefficient ; Horizontal transport ; Latitudinal variation ; Strong convections ; Transport patterns ; Vertical transports ; Computer simulation ; atmospheric chemistry ; atmospheric modeling ; latitude ; measurement method ; methane ; numerical model ; vertical integration ; vertical profile ; Amazonas [Brazil] ; Brazil ; Eurasia ; Mongolia ; Pacific Ocean ; United States
English Abstract: To assess horizontal and vertical transports of methane (CH4) concentrations at different heights within the troposphere, we analyzed simulations by 12 chemistry transport models (CTMs) that participated in the TransCom-CH4 intercomparison experiment. Model results are compared with aircraft measurements at 13 sites in Amazon/Brazil, Mongolia, Pacific Ocean, Siberia/Russia, and United States during the period of 2001-2007. The simulations generally show good agreement with observations for seasonal cycles and vertical gradients. The correlation coefficients of the daily averaged model and observed CH4 time series for the analyzed years are generally larger than 0.5, and the observed seasonal cycle amplitudes are simulated well at most sites, considering the between-model variances. However, larger deviations show up below 2 km for the model-observation differences in vertical profiles at some locations, e.g., at Santarem, Brazil, and in the upper troposphere, e.g., at Surgut, Russia. Vertical gradients and concentrations are underestimated at Southern Great Planes, United States, and Santarem and overestimated at Surgut. Systematic overestimation and underestimation of vertical gradients are mainly attributed to inaccurate emission and only partly to the transport uncertainties. However, large differences in model simulations are found over the regions/seasons of strong convection, which is poorly represented in the models. Overall, the zonal and latitudinal variations in CH4 are controlled by surface emissions below 2.5 kmand transport patterns in the middle and upper troposphere. We show that the models with larger vertical gradients, coupled with slower horizontal transport, exhibit greater CH4 interhemispheric gradients in the lower troposphere. These findings have significant implications for the future development of more accurate CTMs with the possibility of reducing biases in estimated surface fluxes by inverse modeling© 2013. American Geophysical Union.
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Document Type: 期刊论文
Appears in Collections:影响、适应和脆弱性

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Affiliation: Research Institute for Global Change/JAMSTEC, 3173-25 Showa-machi, Yokohama 236-0001, Japan; Center for Atmospheric and Oceanic Studies, Tohoku University, Sendai, Japan; NOAA Earth Systems Research Laboratory, Boulder, CO, United States; Center for Global Environmental Research, National Institute for Environmental Studies, Tsukuba, Japan; Wageningen University and Research Centre, Wageningen, Netherlands; SRON Netherlands Institute for Space Research, Utrecht, Netherlands; Universite de Versailles Saint Quentin en Yvelines, Gif-sur-Yvette, France; European Centre for Medium-Range Weather Forecasts, Reading, United Kingdom; Atmospheric, Earth and Energy Division, Lawrence Livermore National Laboratory, Livermore, CA, United States; Goddard Earth Sciences and Technology Center, NASA Goddard Space Flight Center, Greenbelt, MD, United States; Institute for Climate and Atmospheric Science, School of Earth and Environment, University of Leeds, Leeds, United Kingdom; School of GeoSciences, University of Edinburgh, Edinburgh, United Kingdom; Divisao de Quimica Ambiental, Insituto de Pesquisas Energeticas e Nucleares, Sao Paulo, Brazil; Cornell University, Ithaca, NY, United States; Centre for Australian Weather and Climate Research, CSIRO Marine and Atmospheric Research, Aspendale, VIC, Australia; Department of Geography and Environmental Studies Program, Western Michigan University, Kalamazoo, MI, United States; Center for Global Change Science, Massachusetts Institute of Technology, Cambridge, MA, United States; School of Chemistry, University of Bristol, Bristol, United Kingdom

Recommended Citation:
Saito R.,Patra P.K.,Sweeney C.,et al. TransCom model simulations of methane: Comparison of vertical profiles with aircraft measurements[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(9)
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