DOI: 10.1002/joc.5185
论文题名: Impacts of different ENSO flavors and tropical Pacific convection variability (ITCZ, SPCZ) on austral summer rainfall in South America, with a focus on Peru
作者: Sulca J. ; Takahashi K. ; Espinoza J.-C. ; Vuille M. ; Lavado-Casimiro W.
刊名: International Journal of Climatology
ISSN: 8998418
出版年: 2018
卷: 38, 期: 1 起始页码: 420
结束页码: 435
语种: 英语
英文关键词: Andes
; atmospheric teleconnections
; ENSO
; ITCZ
; Peru
; rainfall
; South America
; SPCZ
Scopus关键词: Atmospheric pressure
; Climatology
; Coastal zones
; Fighter aircraft
; Nickel
; Oceanography
; Oscillating flow
; Regression analysis
; Tropics
; Andes
; Atmospheric teleconnections
; ENSO
; ITCZ
; Peru
; South America
; SPCZ
; Rain
; air-sea interaction
; El Nino
; El Nino-Southern Oscillation
; intertropical convergence zone
; oceanic convection
; precipitation (climatology)
; rainfall
; sea surface temperature
; summer
; teleconnection
; Andes
; Bolivia
; Brazil
; Pacific Ocean
; Pacific Ocean (Central)
; Pacific Ocean (East)
; Pacific Ocean (Tropical)
; Paraguay
; Peru
英文摘要: El Niño in the eastern and central Pacific has different impacts on the rainfall of South America, and the atmospheric pathways through the South Pacific Convergence Zone (SPCZ) and Inter-Tropical Convergence Zone (ITCZ) are poorly understood. To address this, we performed linear regression analysis of E (eastern Pacific) and C (central Pacific) indices of sea surface temperature (SST), as well as precipitation indices for the SPCZ and ITCZ, with gridded precipitation and reanalysis data sets during the austral summer (December–February) for the 1980–2016 period. Positive C induces dry anomalies along the tropical Andes and northern South America (NSA), while wet anomalies prevail over southeastern South America (SESA). Moreover, it produces wet conditions in the northwestern Peruvian Amazon. In contrast, positive E enhances wet conditions along the coasts of Ecuador and northern Peru associated with the southward displacement of the eastern Pacific ITCZ and induces dry conditions in Altiplano, Amazon basin, and northeastern Brazil (NEB). Both El Niño Southern Oscillation (ENSO) indices are associated with weakened upper-level easterly flow over Peru, but it is more restricted to the central and southern Peruvian Andes with positive E. Both SPCZ indices, the zonal position of the SPCZ and its latitudinal displacement, suppress rainfall along western Peruvian Andes when are positive, but the latter also inhibits rainfall over the Bolivian Altiplano. They are also linked to upper-level westerly wind anomalies overall of Peru, but these anomalies do not extend as far south in the first. The southward displacement of the eastern Pacific ITCZ also induces wet anomalies in SESA while dry anomalies prevail over NEB, the western Amazon basin, and Bolivia. Oppositely, the southward displacement of the central Pacific ITCZ induces dry anomalies in NEB and along the northern coast of Peru; while wet anomalies occur mainly in eastern Brazil, Paraguay, and Bolivia through an enhancement of the low level jet. © 2017 Royal Meteorological Society Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/117158
Appears in Collections: 气候减缓与适应
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作者单位: Subdireccion de Ciencias de la Atmósfera e Hidrología, Instituto Geofisico del Perú, Lima, Peru; Department of Atmospheric and Environmental Sciences, University at Albany-SUNYNY, United States; Servicio Nacional Meteorologia e Hidrologia (SENAMHI), Lima, Peru
Recommended Citation:
Sulca J.,Takahashi K.,Espinoza J.-C.,et al. Impacts of different ENSO flavors and tropical Pacific convection variability (ITCZ, SPCZ) on austral summer rainfall in South America, with a focus on Peru[J]. International Journal of Climatology,2018-01-01,38(1)