DOI: 10.1175/JCLI-D-15-0692.1
Scopus记录号: 2-s2.0-84977513121
论文题名: Observed signatures of the barotropic and baroclinic annular modes in cloud vertical structure and cloud radiative effects
作者: Li Y. ; Thompson D.W.J.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2016
卷: 29, 期: 13 起始页码: 4723
结束页码: 4740
语种: 英语
Scopus关键词: Climatology
; Clouds
; Troposphere
; Annular mode
; Climate variability
; Cloud radiative effects
; Cloud vertical structure
; Satellite observations
; Southern Hemisphere
; Top of the atmospheres
; Tropospheric clouds
; Radiation effects
; algorithm
; baroclinic motion
; barotropic motion
; cloud microphysics
; cloud radiative forcing
; CloudSat
; Southern Hemisphere
; troposphere
英文摘要: The signatures of large-scale annular variability on the vertical structure of clouds and cloud radiative effects are examined in vertically resolved CloudSat and other satellite and reanalysis data products. The northern and southern "barotropic" annular modes (the NAM and SAM) have a complex vertical structure. Both are associated with a meridional dipole in clouds between subpolar and middle latitudes, but the sign of the anomalies changes between upper, middle, and lower tropospheric levels. In contrast, the northern and southern baroclinic annular modes have a much simpler vertical structure. Both are linked to same-signed anomalies in clouds extending throughout the troposphere at middle to high latitudes. The changes in cloud incidence associated with both the barotropic and baroclinic annular modes are consistent with dynamical forcing by the attendant changes in static stability and/or vertical motion. The results also provide the first observational estimates of the vertically resolved atmospheric cloud radiative effects associated with hemispheric-scale extratropical variability. In general, the anomalies in atmospheric cloud radiative effects associated with the annular modes peak in the middle to upper troposphere, and are consistent with the anomalous trapping of longwave radiation by variations in upper tropospheric clouds. The southern baroclinic annular mode gives rise to periodic behavior in longwave cloud radiative effects at the top of the atmosphere averaged over Southern Hemisphere midlatitudes. © 2016 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50285
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Atmospheric Science, Colorado State University, Fort Collins, CO, United States
Recommended Citation:
Li Y.,Thompson D.W.J.. Observed signatures of the barotropic and baroclinic annular modes in cloud vertical structure and cloud radiative effects[J]. Journal of Climate,2016-01-01,29(13)