| DOI: | 10.1175/JCLI-D-12-00001.1
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| Scopus记录号: | 2-s2.0-84867143429
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| 论文题名: | Large-scale control on the Patagonian climate |
| 作者: | Garreaud R.; Lopez P.; Minvielle M.; Rojas M.
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| 刊名: | Journal of Climate
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| ISSN: | 8948755
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| 出版年: | 2013
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| 卷: | 26, 期:1 | | 起始页码: | 215
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| 结束页码: | 230
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| 语种: | 英语
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| Scopus关键词: | Air temperature
; Annual cycle
; Austral summers
; Downslope
; Environmental records
; High Latitudes
; High-resolution numerical simulation
; Interannual time scale
; Large-scale circulation
; Local climate
; Main mode
; Meteorological station
; Near surface air temperature
; Patagonia
; Rainfall variability
; Reanalysis
; Remote regions
; South America
; Varying temperature
; Wind anomalies
; Zonal flows
; Zonal wind
; Climatology
; Mathematical models
; Climate control
; air temperature
; annual variation
; atmospheric circulation
; numerical model
; precipitation (climatology)
; regional climate
; zonal wind
; Patagonia
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| 英文摘要: | Patagonia, located in southern South America, is a vast and remote region holding a rich variety of past environmental records but a small number of meteorological stations. Precipitation over this region is mostly produced by disturbances embedded in the westerly flow and is strongly modified by the austral Andes. Uplift on the windward side leads to hyperhumid conditions along the Pacific coast and the western slope of the Andes; in contrast, downslope subsidence dries the eastern plains leading to arid, highly evaporative conditions. The authors investigate the dependence of Patagonia's local climate (precipitation and near-surface air temperature) year-to-year variability on large-scale circulation anomalies using results from a 30-yr-long high-resolution numerical simulation. Variations of the low-level zonal wind account for a large fraction of the rainfall variability at synoptic and interannual time scales. Zonal wind also controls the amplitude of the air temperature annual cycle by changing the intensity of the seasonally varying temperature advection. The main modes of year-to-year variability of the zonal flow over southern South America are also investigated. Year round there is a dipole between mid- and high latitudes. The node separating wind anomalies of opposite sign migrates through the seasons, leading to a dipole over Patagonia during austral summer and a monopole during winter. Reanalysis data also suggests that westerly flow has mostly decreased over northcentral Patagonia during the last four decades, causing a drying trend to the west of the Andes, but a modest increase is exhibited over the southern tip of the continent. © 2013 American Meteorological Society. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/52060
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| Appears in Collections: | 气候变化事实与影响
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作者单位: | Department of Geophysics, Universidad de Chile, Santiago, Chile
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| Recommended Citation: | |
Garreaud R.,Lopez P.,Minvielle M.,et al. Large-scale control on the Patagonian climate[J]. Journal of Climate,2013-01-01,26(1)
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