DOI: 10.5194/cp-8-723-2012
Scopus记录号: 2-s2.0-84859412117
论文题名: Monsoonal response to mid-holocene orbital forcing in a high resolution GCM
作者: Bosmans J.H.C. ; Drijfhout S.S. ; Tuenter E. ; Lourens L.J. ; Hilgen F.J. ; Weber S.L.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2012
卷: 8, 期: 2 起始页码: 723
结束页码: 740
语种: 英语
Scopus关键词: atmosphere-ocean coupling
; climate modeling
; general circulation model
; global warming
; Holocene
; insolation
; intertropical convergence zone
; meridional circulation
; moisture transfer
; monsoon
; Northern Hemisphere
; numerical model
; orbital forcing
; paleoceanography
; paleoenvironment
; precipitation (climatology)
; pressure gradient
; resolution
; Southern Hemisphere
; temperature effect
; North Africa
; South America
英文摘要: In this study, we use a sophisticated high-resolution atmosphere-ocean coupled climate model, EC-Earth, to investigate the effect of Mid-Holocene orbital forcing on summer monsoons on both hemispheres. During the Mid-Holocene (6 ka), there was more summer insolation on the Northern Hemisphere than today, which intensified the meridional temperature and pressure gradients. Over North Africa, monsoonal precipitation is intensified through increased landward monsoon winds and moisture advection as well as decreased moisture convergence over the oceans and more convergence over land compared to the pre-industrial simulation. Precipitation also extends further north as the ITCZ shifts northward in response to the stronger poleward gradient of insolation. This increase and poleward extent is stronger than in most previous ocean-atmosphere GCM simulations. In north-westernmost Africa, precipitation extends up to 35°N. Over tropical Africa, internal feedbacks completely overcome the direct warming effect of increased insolation. We also find a weakened African Easterly Jet. Over Asia, monsoonal precipitation during the Mid-Holocene is increased as well, but the response is different than over North-Africa. There is more convection over land at the expense of convection over the ocean, but precipitation does not extend further northward, monsoon winds over the ocean are weaker and the surrounding ocean does not provide more moisture. On the Southern Hemisphere, summer insolation and the poleward insolation gradient were weaker during the Mid-Holocene, resulting in a reduced South American monsoon through decreased monsoon winds and less convection, as well as an equatorward shift in the ITCZ. This study corroborates the findings of paleodata research as well as previous model studies, while giving a more detailed account of Mid-Holocene monsoons. © Author(s) 2012. CC Attribution 3.0 License. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49591
Appears in Collections: 气候变化与战略
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Recommended Citation:
Bosmans J.H.C.,Drijfhout S.S.,Tuenter E.,et al. Monsoonal response to mid-holocene orbital forcing in a high resolution GCM[J]. Climate of the Past,2012-01-01,8(2)