DOI: 10.1002/2014GL062927
论文题名: Quantifying the effects of mixing and residual circulation on trends of stratospheric mean age of air
作者: Ploeger F. ; Abalos M. ; Birner T. ; Konopka P. ; Legras B. ; Müller R. ; Riese M.
刊名: Geophysical Research Letters
ISSN: 0094-8850
EISSN: 1944-8581
出版年: 2015
卷: 42, 期: 6 起始页码: 2047
结束页码: 2054
语种: 英语
英文关键词: age of air
; Brewer-Dobson circulation
; mean age
; mixing
; residual circulation
; trends
Scopus关键词: Climate models
; Lagrange multipliers
; Age of air
; Brewer-Dobson circulation
; Mean ages
; Residual circulations
; trends
; Mixing
; airflow
; asymmetry
; atmospheric circulation
; climate modeling
; Lagrangian analysis
; satellite imagery
; simulation
; stratosphere
; Bivalvia
英文摘要: It is an outstanding issue to what degree trends in stratospheric mean age of air reflect changes in the (slow) residual circulation and how they are affected by (fast) eddy mixing. We present a method to quantify the effects of mixing and residual circulation on mean age trends, based on simulations with the Chemical Lagrangian Model of the Stratosphere (CLaMS) driven by ERA-Interim reanalysis and on the integrated tracer continuity equation. During 1990-2013, mean age decreases throughout most of the stratosphere, qualitatively consistent with results based on climate model simulations. During 2002-2012, age changes show a clear hemispheric asymmetry in agreement with satellite observations. We find that changes in the residual circulation transit time cannot explain the mean age trends, and including the integrated effect of mixing is crucial. Above about 550 K (about 22 km), trends in the mixing effect on mean age appear to be coupled to residual circulation changes. Key Points Reconcile long-term mean age decrease and observed decadal variability Mixing effect is crucial to explain mean age trends Mixing effect on mean age is partly coupled to the residual circulation ©2015. The Authors. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84926627821&doi=10.1002%2f2014GL062927&partnerID=40&md5=f8c26c54cb19f7126e60a5157c616f69
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8466
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Institute of Energy and Climate Research, Stratosphere (IEK-7), Forschungszentrum Jülich, Jülich, Germany
Recommended Citation:
Ploeger F.,Abalos M.,Birner T.,et al. Quantifying the effects of mixing and residual circulation on trends of stratospheric mean age of air[J]. Geophysical Research Letters,2015-01-01,42(6).