气候变化领域集成服务门户(CCPortal): How can Brewer-Dobson circulation trends be estimated from changes in stratospheric water vapour and methane?

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DOI	10.5194/acp-22-9895-2022
	How can Brewer-Dobson circulation trends be estimated from changes in stratospheric water vapour and methane?
	Poshyvailo-Strube, Liubov; Mueller, Rolf; Fueglistaler, Stephan; Hegglin, Michaela, I; Laube, Johannes C.; Volk, C. Michael; Ploeger, Felix
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	9895
结束页码	9914
卷号	22 期号:15 页码:20
英文摘要	The stratospheric meridional overturning circulation, also referred to as the Brewer-Dobson circulation (BDC), controls the composition of the stratosphere, which, in turn, affects radiation and climate. As the BDC cannot be directly measured, one has to infer its strength and trends indirectly. For instance, trace gas measurements allow the calculation of average transit times. Satellite measurements provide information on the distributions of trace gases for the entire stratosphere, with measurements of particularly long temporal and dense spatial coverage available for stratospheric water vapour (H2O). Although chemical processes and boundary conditions confound interpretation, the influence of methane (CH4) oxidation on H2O in the stratosphere is relatively straightforward, and thus H2O is an appealing tracer for transport analysis despite these caveats. In this work, we explore how mean age of air trends can be estimated from the combination of stratospheric H2O and CH4 data, by carrying out a proof of concept within the model environment of the Chemical Lagrangian Model of the Stratosphere (CLaMS). In particular, we assess the methodological uncertainties related to the two commonly used approximations of (i) instantaneous stratospheric entry mixing ratio propagation and (ii) constant correlation between mean age and the fractional release factor of CH4. Performing various sensitivity studies with CLaMS, we test different methods of the mean age of air trend estimation, and we aim to provide simple and practical advice on the adjustment of the used approximations for obtaining more reliable mean age of air trends from the measurements of H2O and CH4. Our results show that the estimated mean age of air trends from the combination of stratospheric H2O and CH4 changes may be significantly affected by the assumed approximations. Depending on the investigated stratospheric region and the considered period, the error in estimated mean age of air trends can be large, especially in the lower stratosphere. For particular periods, the errors from the two approximations can lead to opposite effects, which may even cancel out. Finally, for a more reliable estimate of the mean age of air trends, we propose adjusting the approximation method by using an idealized age spectrum to propagate stratospheric entry mixing ratios. The findings of this work can be used for assessing the uncertainties in stratospheric BDC trend estimation from global satellite measurements.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000835274100001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273075
作者单位	Helmholtz Association; Research Center Julich; Helmholtz Association; Research Center Julich; National Oceanic Atmospheric Admin (NOAA) - USA; Princeton University; Princeton University; University of Reading; University of Wuppertal
推荐引用方式 GB/T 7714	Poshyvailo-Strube, Liubov,Mueller, Rolf,Fueglistaler, Stephan,et al. How can Brewer-Dobson circulation trends be estimated from changes in stratospheric water vapour and methane?[J],2022,22(15):20.
APA	Poshyvailo-Strube, Liubov.,Mueller, Rolf.,Fueglistaler, Stephan.,Hegglin, Michaela, I.,Laube, Johannes C..,...&Ploeger, Felix.(2022).How can Brewer-Dobson circulation trends be estimated from changes in stratospheric water vapour and methane?.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(15),20.
MLA	Poshyvailo-Strube, Liubov,et al."How can Brewer-Dobson circulation trends be estimated from changes in stratospheric water vapour and methane?".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.15(2022):20.