globalchange  > 过去全球变化的重建
DOI: 10.1007/s00382-013-2015-2
Scopus记录号: 2-s2.0-84919914645
论文题名:
What dynamics drive future wind scenarios for coastal upwelling off Peru and Chile?
作者: Belmadani A.; Echevin V.; Codron F.; Takahashi K.; Junquas C.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2013
卷: 43, 期:2017-07-08
起始页码: 1893
结束页码: 1914
语种: 英语
英文关键词: Climate scenarios ; Dynamical downscaling ; Peru–Chile upwelling system ; Regional climate change ; Upwelling-favorable winds
英文摘要: The dynamics of the Peru–Chile upwelling system (PCUS) are primarily driven by alongshore wind stress and curl, like in other eastern boundary upwelling systems. Previous studies have suggested that upwelling-favorable winds would increase under climate change, due to an enhancement of the thermally-driven cross-shore pressure gradient. Using an atmospheric model on a stretched grid with increased horizontal resolution in the PCUS, a dynamical downscaling of climate scenarios from a global coupled general circulation model (CGCM) is performed to investigate the processes leading to sea-surface wind changes. Downscaled winds associated with present climate show reasonably good agreement with climatological observations. Downscaled winds under climate change show a strengthening off central Chile south of 35°S (at 30°S–35°S) in austral summer (winter) and a weakening elsewhere. An alongshore momentum balance shows that the wind slowdown (strengthening) off Peru and northern Chile (off central Chile) is associated with a decrease (an increase) in the alongshore pressure gradient. Whereas the strengthening off Chile is likely due to the poleward displacement and intensification of the South Pacific Anticyclone, the slowdown off Peru may be associated with increased precipitation over the tropics and associated convective anomalies, as suggested by a vorticity budget analysis. On the other hand, an increase in the land–sea temperature difference is not found to drive similar changes in the cross-shore pressure gradient. Results from another atmospheric model with distinct CGCM forcing and climate scenarios suggest that projected wind changes off Peru are sensitive to concurrent changes in sea surface temperature and rainfall. © 2013, Springer-Verlag Berlin Heidelberg.
资助项目: JAMSTEC, Japan Agency for Marine-Earth Science and Technology ; NOAA, Japan Agency for Marine-Earth Science and Technology ; NASA, Japan Agency for Marine-Earth Science and Technology
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54958
Appears in Collections:过去全球变化的重建

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作者单位: Laboratoire d’Océanographie et du Climat, Expérimentations et Approches Numériques (LOCEAN), Institut de Recherche pour le Développement (IRD), Institut Pierre-Simon Laplace (IPSL), Université Pierre et Marie Curie (UPMC), Paris, France; International Pacific Research Center (IPRC), School of Ocean and Earth Science and Technology (SOEST), University of Hawaii at Manoa, Honolulu, HI, United States; Department of Geophysics (DGEO), Universidad de Concepcion (UdeC), Avda. Esteban Iturra s/n, Barrio Universitario, Casilla 160-C, Concepción, Chile; Laboratoire de Météorologie Dynamique (LMD), IPSL, UPMC, Paris, France; Instituto Geofisico del Peru (IGP), Lima, Peru; IRD/UJF-Grenoble 1/CNRS/G-INP, LTHE UMR 5564, Grenoble, France

Recommended Citation:
Belmadani A.,Echevin V.,Codron F.,et al. What dynamics drive future wind scenarios for coastal upwelling off Peru and Chile?[J]. Climate Dynamics,2013-01-01,43(2017-07-08)
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