气候变化领域集成服务门户(CCPortal): The stratospheric Brewer-Dobson circulation inferred from age of air in the ERA5 reanalysis

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DOI	10.5194/acp-21-8393-2021
	The stratospheric Brewer-Dobson circulation inferred from age of air in the ERA5 reanalysis
	Ploeger F.; Diallo M.; Charlesworth E.; Konopka P.; Legras B.; Laube J.C.; Grooß J.-U.; Günther G.; Engel A.; Riese M.
发表日期	2021
ISSN	1680-7316
起始页码	8393
结束页码	8412
卷号	21 期号:11
英文摘要	This paper investigates the global stratospheric Brewer-Dobson circulation (BDC) in the ERA5 meteorological reanalysis from the European Centre for Medium-Range Weather Forecasts (ECMWF). The analysis is based on simulations of stratospheric mean age of air, including the full age spectrum, with the Lagrangian transport model CLaMS (Chemical Lagrangian Model of the Stratosphere), driven by reanalysis winds and total diabatic heating rates. ERA5-based results are compared to results based on the preceding ERA-Interim reanalysis. Our results show a significantly slower BDC for ERA5 than for ERA-Interim, manifesting in weaker diabatic heating rates and higher age of air. In the tropical lower stratosphere, heating rates are 30 %-40 % weaker in ERA5, likely correcting a bias in ERA-Interim. At 20 km and in the Northern Hemisphere (NH) stratosphere, ERA5 age values are around the upper margin of the uncertainty range from historical tracer observations, indicating a somewhat slow-biased BDC. The age trend in ERA5 over the 1989-2018 period is negative throughout the stratosphere, as climate models predict in response to global warming. However, the age decrease is not linear but steplike, potentially caused by multi-Annual variability or changes in the observations included in the assimilation. During the 2002-2012 period, the ERA5 age shows a similar hemispheric dipole trend pattern as ERA-Interim, with age increasing in the NH and decreasing in the Southern Hemisphere (SH). Shifts in the age spectrum peak and residual circulation transit times indicate that reanalysis differences in age are likely caused by differences in the residual circulation. In particular, the shallow BDC branch accelerates in both reanalyses, whereas the deep branch accelerates in ERA5 and decelerates in ERA-Interim. © 2021 American Institute of Physics Inc.. All rights reserved.
语种	英语
scopus关键词	atmospheric circulation; atmospheric transport; diabatic process; heating; Lagrangian analysis; Northern Hemisphere; stratosphere; weather forecasting; wind
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/246842
作者单位	Institute for Energy and Climate Research: Stratosphere (IEK-7), Forschungszentrum Jülich, Jülich, Germany; Institute for Atmospheric and Environmental Research, University of Wuppertal, Wuppertal, Germany; Laboratoire de Météorologie Dynamique, UMR8539, UPMC-ENS-CNRS-Ecole Polytechnique, Paris, France; Institute for Atmospheric and Environmental Sciences, Goethe University Frankfurt, Frankfurt, Germany
推荐引用方式 GB/T 7714	Ploeger F.,Diallo M.,Charlesworth E.,et al. The stratospheric Brewer-Dobson circulation inferred from age of air in the ERA5 reanalysis[J],2021,21(11).
APA	Ploeger F..,Diallo M..,Charlesworth E..,Konopka P..,Legras B..,...&Riese M..(2021).The stratospheric Brewer-Dobson circulation inferred from age of air in the ERA5 reanalysis.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(11).
MLA	Ploeger F.,et al."The stratospheric Brewer-Dobson circulation inferred from age of air in the ERA5 reanalysis".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.11(2021).