DOI: 10.5194/cp-12-1681-2016
Scopus记录号: 2-s2.0-84983738745
论文题名: The South American monsoon variability over the last millennium in climate models
作者: Rojas M. ; Arias P.A. ; Flores-Aqueveque V. ; Seth A. ; Vuille M.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2016
卷: 12, 期: 8 起始页码: 1681
结束页码: 1691
语种: 英语
Scopus关键词: anticyclone
; atmospheric circulation
; climate modeling
; Little Ice Age
; Medieval Warm Period
; monsoon
; paleoclimate
; precipitation (climatology)
; proxy climate record
; rainfall
; reconstruction
; subtropical region
; temperature anomaly
; troposphere
; Atlantic Ocean
; Atlantic Ocean (South)
; South America
英文摘要: In this paper we assess South American monsoon system (SAMS) variability in the last millennium as depicted by global coupled climate model simulations. High-resolution proxy records for the South American monsoon over this period show a coherent regional picture of a weak monsoon during the Medieval Climate Anomaly and a stronger monsoon during the Little Ice Age (LIA). Due to the small external forcing during the past 1000 years, model simulations do not show very strong temperature anomalies over these two specific periods, which in turn do not translate into clear precipitation anomalies, in contrast with the rainfall reconstructions in South America. Therefore, we used an ad hoc definition of these two periods for each model simulation in order to account for model-specific signals. Thereby, several coherent large-scale atmospheric circulation anomalies are identified. The models feature a stronger monsoon during the LIA associated with (i) an enhancement of the rising motion in the SAMS domain in austral summer; (ii) a stronger monsoon-related upper-tropospheric anticyclone; (iii) activation of the South American dipole, which results in a poleward shift of the South Atlantic Convergence Zone; and (iv) a weaker upper-level subtropical jet over South America. The diagnosed changes provide important insights into the mechanisms of these climate anomalies over South America during the past millennium. © 2016 Author(s). 资助项目: FONDECYT, Fondo Nacional de Desarrollo Científico y Tecnológico
; FONDECYT, Fondo Nacional de Desarrollo Científico y Tecnológico
; FONDECYT, Fondo Nacional de Desarrollo Científico y Tecnológico
; FONDECYT, Fondo Nacional de Desarrollo Científico y Tecnológico
; NOAA, National Oceanic and Atmospheric Administration
; NSF, National Science Foundation
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/48982
Appears in Collections: 气候变化与战略
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Recommended Citation:
Rojas M.,Arias P.A.,Flores-Aqueveque V.,et al. The South American monsoon variability over the last millennium in climate models[J]. Climate of the Past,2016-01-01,12(8)