DOI: 10.1002/2015JD023657
论文题名: Observational evidence of strengthening of the Brewer-Dobson circulation since 1980
作者: Fu Q. ; Lin P. ; Solomon S. ; Hartmann D.L.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2015
卷: 120, 期: 19 起始页码: 10214
结束页码: 10228
语种: 英语
英文关键词: Brewer
; circulation
; Dobson
; MSU/AMSU
; stratosphere
; temperature
Scopus关键词: aerosol
; atmospheric circulation
; greenhouse gas
; microwave limb sounder
; Northern Hemisphere
; ozone
; radiative transfer
; satellite data
; Southern Hemisphere
; stratosphere
; temperature profile
; water vapor
英文摘要: The change of the Brewer-Dobson circulation (BDC) over the period of 1980-2009 is examined through a combined analysis of satellite Microwave Sounding Unit (MSU/AMSU) lower stratospheric temperatures (TLS), ERA-Interim reanalysis data, and observed estimates of changes in ozone, water vapor, well-mixed greenhouse gases, and stratospheric aerosols. The MSU/AMSU-observed tropical TLS trend is first empirically separated into a dynamic component associated with the BDC changes and a radiative component due to the atmospheric composition changes. The derived change in the dynamic component suggests that the annual mean BDC has accelerated in the last 30 years (at the 90% confidence interval), with most of the change coming from the Southern Hemisphere. The annual mean Northern Hemisphere contribution to the acceleration is not statistically significant. The radiative component of tropical TLS trends is independently checked using observed changes in stratospheric composition. It is shown that the changes in ozone, stratospheric aerosols, well-mixed greenhouse gases, and water vapor make important contributions to the radiative component of tropical TLS trends. Despite large uncertainties in lower stratospheric cooling associated with uncertainties in observed ozone and water vapor changes, this derived radiative component agrees with the empirically inferred radiative component, both in terms of its average value and small seasonal dependence. By establishing a relationship between tropical residual vertical velocity at 70 hPa and TLS, we show that the relative strengthening of the annual mean BDC is about 2.1% per decade for 1980-2009, supporting the results from state-of-the-art chemistry-climate model simulations. ©2015. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62976
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Department of Atmospheric Sciences, University of Washington, Seattle, WA, United States; Atmospheric and Oceanic Sciences Program, Princeton University, Princeton, NJ, United States; Department of Earth Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, United States
Recommended Citation:
Fu Q.,Lin P.,Solomon S.,et al. Observational evidence of strengthening of the Brewer-Dobson circulation since 1980[J]. Journal of Geophysical Research: Atmospheres,2015-01-01,120(19)