DOI: 10.1175/JCLI-D-12-00674.1
Scopus记录号: 2-s2.0-84884225167
论文题名: Mechanisms of mid-holocene precipitation change in the south pacific convergence zone
作者: Mantsis D.F. ; Lintner B.R. ; Broccoli A.J. ; Khodri M.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期: 18 起始页码: 6937
结束页码: 6953
语种: 英语
Scopus关键词: Circulation models
; Complexity modeling
; Moisture convergence
; Paleoclimate modelling
; Pre-industrial conditions
; Precipitation change
; Sea surface temperature (SST)
; South pacific convergence zones
; Moisture
; Rain
; Salinity measurement
; Stretching
; Tropics
; atmospheric circulation
; climate modeling
; convection
; Holocene
; monsoon
; paleoclimate
; precipitation (climatology)
; rainfall
; sea surface temperature
; top of atmosphere
; tropical environment
; Pacific Ocean
; Pacific Ocean (South)
英文摘要: The variability of the South Pacific convergence zone (SPCZ) during the mid-Holocene is investigated using models archived in the Paleoclimate Modelling Intercomparison Project Phase II (PMIP2) database. Relative to preindustrial conditions, mid-Holocene top-of-atmosphere insolation was relatively lower during austral summer [December-February (DJF)], which is the season when the SPCZ is at its peak intensity. In response to this perturbation, the PMIP2 models simulate a displacement of the SPCZ to the southwest. This SPCZ shift is associated with a sea surface temperature (SST) dipole, with increased rainfall collocated with warm SST anomalies. Decomposing the DJF precipitation changes in terms of a diagnostic moisture budget indicates that the SPCZ shift is balanced to leading order by a change in the mean moisture convergence. Changes to the broad area of upper-level negative zonal stretching deformation, where transient eddies can become trapped and subsequently generate deep convection, support the notion that the SPCZ shift in the subtropics is tied to eddy forcing. Idealized experiments performed with an intermediate-level complexity model, the Quasi-Equilibrium Tropical Circulation Model (QTCM), suggest that the mid-Holocene change in rainfall in the SPCZ region as well as the equatorial Pacific is dominated by a change in the underlying SST. The tropical portion of the SPCZ is further remotely affected by the orbitally induced weakening of the Australian monsoon, even though this effect is weaker compared to the effect from SSTs. © 2013 American Meteorological Society. 资助项目: NSF, National Science Foundation
; AGS, Division of Atmospheric and Geospace Sciences
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51676
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Rutgers, The State University of New Jersey, New Brunswick, NJ, United States; Laboratoire d'Océanographie et du Climat, IPSL, Paris, France
Recommended Citation:
Mantsis D.F.,Lintner B.R.,Broccoli A.J.,et al. Mechanisms of mid-holocene precipitation change in the south pacific convergence zone[J]. Journal of Climate,2013-01-01,26(18)