气候变化领域集成服务门户(CCPortal): Seasonal Variations of SF6, CO2, CH4, and N2O in the UT/LS Region due to Emissions, Transport, and Chemistry

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DOI	10.1029/2020JD033541
	Seasonal Variations of SF6, CO2, CH4, and N2O in the UT/LS Region due to Emissions, Transport, and Chemistry
	Bisht J.S.H.; Machida T.; Chandra N.; Tsuboi K.; Patra P.K.; Umezawa T.; Niwa Y.; Sawa Y.; Morimoto S.; Nakazawa T.; Saitoh N.; Takigawa M.
发表日期	2021
ISSN	2169897X
卷号	126 期号:4
英文摘要	Distributions of trace gases in the atmosphere provide key information on the transport and chemical properties of the Earth's environment. In this study, we examine the observed seasonal variability of SF6, CO2, CH4, and N2O from commercial aircraft-based measurements in the upper troposphere and lower stratosphere (UT/LS) in combination with atmospheric chemistry-transport model (ACTM) simulations. We used a dynamical tropopause defined based on maximum PV gradient that better allows for model-observation comparisons in the UT and LS regions separately. The ACTM simulated the following observed features well: (1) smaller seasonality in SF6 in the UT than in the LS due to seasonal change in the transport processes, (2) large seasonality in CO2 in the UT, in phase with the source-sink balance on the Earth's surface, (3) pronounced seasonality in CH4 in the UT with opposite phase in the subtropics and Eurasian high latitudes as contrasting phases of source and chemical loss seasonality develop, and (4) small N2O variability in the UT but stratospheric loss produces distinct seasonality in the LS. Vertical profile comparisons of all the species show that ACTM better simulated the photo-chemically inert CO2 vertical gradients in all seasons, suggesting a realistic representation of the Brewer-Dobson circulation in the model. The seasonal variabilities of the long-lived species in the LS can be explained based on age of air derived from CO2 in the older air regime, except for the months of May-July, when the model mixes UT and LS air more vigorously than suggested by the observations. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	CONTRAIL; MIROC; UT/LS
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185489
作者单位	Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokohama, Japan; CGER, National Institute for Environmental Studies, Tsukuba, Japan; Department of Climate and Geochemistry Research, Meteorological Research Institute, Tsukuba, Japan; Center for Environmental Remote Sensing, Chiba University, Chiba, Japan; Japan Meteorological Agency, Tokyo, Japan; Graduate School of Science, Tohoku University, Sendai, Japan
推荐引用方式 GB/T 7714	Bisht J.S.H.,Machida T.,Chandra N.,et al. Seasonal Variations of SF6, CO2, CH4, and N2O in the UT/LS Region due to Emissions, Transport, and Chemistry[J],2021,126(4).
APA	Bisht J.S.H..,Machida T..,Chandra N..,Tsuboi K..,Patra P.K..,...&Takigawa M..(2021).Seasonal Variations of SF6, CO2, CH4, and N2O in the UT/LS Region due to Emissions, Transport, and Chemistry.Journal of Geophysical Research: Atmospheres,126(4).
MLA	Bisht J.S.H.,et al."Seasonal Variations of SF6, CO2, CH4, and N2O in the UT/LS Region due to Emissions, Transport, and Chemistry".Journal of Geophysical Research: Atmospheres 126.4(2021).