DOI: 10.1175/JCLI-D-15-0491.1
Scopus记录号: 2-s2.0-84960904586
论文题名: Decadal modulations of interhemispheric global atmospheric circulations and monsoons by the South Atlantic meridional overturning circulation
作者: Lopez H. ; Dong S. ; Lee S.-K. ; Goni G.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2016
卷: 29, 期: 5 起始页码: 1831
结束页码: 1851
语种: 英语
Scopus关键词: Atmospheric thermodynamics
; Climatology
; Earth atmosphere
; Heat flux
; Heat transfer
; Meteorology
; Moisture
; Decadal variability
; General circulation model
; Hadley circulation
; Meridional overturning circulations
; Variability
; Atmospheric movements
; atmospheric circulation
; decadal variation
; general circulation model
; Hadley cell
; heat flux
; heat transfer
; meridional circulation
; monsoon
; overturn
; Atlantic Ocean
; Atlantic Ocean (South)
英文摘要: This study presents a physical mechanism on how low-frequency variability of the South Atlantic meridional heat transport (SAMHT) may influence decadal variability of atmospheric circulation. A multicentury simulation of a coupled general circulation model is used as basis for the analysis. The highlight of the findings herein is that multidecadal variability of SAMHT plays a key role in modulating global atmospheric circulation via its influence on interhemispheric redistributions of momentum, heat, and moisture. Weaker SAMHT at 30°S produces anomalous ocean heat divergence over the South Atlantic, resulting in negative ocean heat content anomalies about 15-20 years later. This forces a thermally direct anomalous interhemispheric Hadley circulation, transporting anomalous atmospheric heat from the Northern Hemisphere (NH) to the Southern Hemisphere (SH) and moisture from the SH to the NH, thereby modulating global monsoons. Further analysis shows that anomalous atmospheric eddies transport heat northward in both hemispheres, producing eddy heat flux convergence (divergence) in the NH (SH) around 15°-30°, reinforcing the anomalous Hadley circulation. The effect of eddies on the NH (SH) poleward of 30° depicts heat flux divergence (convergence), which must be balanced by sinking (rising) motion, consistent with a poleward (equatorward) displacement of the jet stream. This study illustrates that decadal variations of SAMHT could modulate the strength of global monsoons with 15-20 years of lead time, suggesting that SAMHT is a potential predictor of global monsoon variability. A similar mechanistic link exists between the North Atlantic meridional heat transport (NAMHT) at 30°N and global monsoons. © 2016 American Meteorological Society. 资助项目: CPO, Climate Program Office
; NOAA, National Oceanic and Atmospheric Administration
; NOAA, National Oceanic and Atmospheric Administration
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50271
Appears in Collections: 气候变化事实与影响
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作者单位: Cooperative Institute for Marine and Atmospheric Studies, University of Miami, Miami, FL, United States; NOAA/Atlantic Oceanographic and Meteorological Laboratory, Miami, FL, United States
Recommended Citation:
Lopez H.,Dong S.,Lee S.-K.,et al. Decadal modulations of interhemispheric global atmospheric circulations and monsoons by the South Atlantic meridional overturning circulation[J]. Journal of Climate,2016-01-01,29(5)