DOI: 10.1175/JCLI-D-13-00656.1
Scopus记录号: 2-s2.0-84901845104
论文题名: Observing interannual variations in hadley circulation atmospheric diabatic heating and circulation strength
作者: Loeb N.G. ; Rutan D.A. ; Kato S. ; Wang W.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 11 起始页码: 4139
结束页码: 4158
语种: 英语
Scopus关键词: Atmospheric radiation
; Cooling
; Heat flux
; Kinetics
; Satellites
; Surface measurement
; Circulation changes
; Cloud radiative effects
; Direct calculation
; Hadley circulation
; Interannual variation
; Satellite observations
; Strength variability
; Surface radiative flux
; Heating
; annual variation
; diabatic process
; Hadley cell
; radiative forcing
; satellite data
; sensible heat flux
; troposphere
英文摘要: Satellite and reanalysis data are used to observe interannual variations in atmospheric diabatic heating and circulation within the ascending and descending branches of the Hadley circulation (HC) during the past 12 yr. The column-integrated divergence of dry static energy (DSE) and kinetic energy is inferred from satellite-based observations of atmospheric radiation, precipitation latent heating, and reanalysis-based surface sensible heat flux for monthly positions of the HC branches, determined from a mass weighted zonal mean meridional streamfunction analysis. Mean surface radiative fluxes inferred from satellite and surface measurements are consistent to 1Wm-2 (,1%) over land and 4Wm-2 (2%) over ocean. In the ascending branch, where precipitation latent heating dominates over radiative cooling, discrepancies in latent heating among different precipitation datasets reach 22Wm-2 (17%), compared to 3-6Wm-2 in the descending branches. Whereas direct calculations of DSE divergence from two reanalyses show opposite trends, the impliedDSE divergence fromthe satellite observations of atmospheric diabatic heating exhibits no trend in all three HC branches and is strongly correlated (reaching 0.90) with midtropospheric vertical velocity. The implied DSE divergence from satellite observations thus provides a useful independent measure of HC circulation strength variability. The sensitivity to circulation change is 4-5 times larger for precipitation latent heating compared to atmospheric radiative cooling in the descending branches and 20 times larger in the ascending branch. The difference in sensitivity is due to cloud radiative effects, which enhance atmospheric radiative cooling in the descending branches in response to an increase in HC strength but decrease it in the ascending branch. © 2014 American Meteorological Society. 资助项目: NASA, National Aeronautics and Space Administration
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51021
Appears in Collections: 气候变化事实与影响
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作者单位: NASA Langley Research Center, Mail Stop 420, Hampton, VA 23681-2199, United States; Science Systems and Applications, Inc., Hampton, VA, United States; Scripps Institution of Oceanography, La Jolla, CA, United States
Recommended Citation:
Loeb N.G.,Rutan D.A.,Kato S.,et al. Observing interannual variations in hadley circulation atmospheric diabatic heating and circulation strength[J]. Journal of Climate,2014-01-01,27(11)