DOI: 10.1007/s00382-017-3858-8
Scopus记录号: 2-s2.0-85015692024
论文题名: Understanding the influence of orography on the precipitation diurnal cycle and the associated atmospheric processes in the central Andes
作者: Junquas C. ; Takahashi K. ; Condom T. ; Espinoza J.-C. ; Chavez S. ; Sicart J.-E. ; Lebel T.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2018
卷: 50, 期: 2018-11-12 起始页码: 3995
结束页码: 4017
语种: 英语
英文关键词: Central Andes
; Diurnal cycle
; Moisture flux
; Peru
; Precipitation
; WRF model
Scopus关键词: atmospheric modeling
; diurnal variation
; moisture flux
; orography
; precipitation assessment
; TRMM
; weather forecasting
; Amazon River
; Andes
; Apurimac Valley
; Peru
英文摘要: In the tropical Andes, the identification of the present synoptic mechanisms associated with the diurnal cycle of precipitation and its interaction with orography is a key step to understand how the atmospheric circulation influences the patterns of precipitation variability on longer time-scales. In particular we aim to better understand the combination of the local and regional mechanisms controlling the diurnal cycle of summertime (DJF) precipitation in the Northern Central Andes (NCA) region of Southern Peru. A climatology of the diurnal cycle is obtained from 15 wet seasons (2000–2014) of 3-hourly TRMM-3B42 data (0.25° × 0.25°) and swath data from the TRMM-2A25 precipitation radar product (5 km × 5 km). The main findings are: (1) in the NCA region, the diurnal cycle shows a maximum precipitation occurring during the day (night) in the western (eastern) side of the Andes highlands, (2) in the valleys of the Cuzco region and in the Amazon slope of the Andes the maximum (minimum) precipitation occurs during the night (day). The WRF (Weather Research and Forecasting) regional atmospheric model is used to simulate the mean diurnal cycle in the NCA region for the same period at 27 km and 9 km horizontal grid spacing and 3-hourly output, and at 3 km only for the month of January 2010 in the Cuzco valleys. Sensitivity experiments were also performed to investigate the effect of the topography on the observed rainfall patterns. The model reproduces the main diurnal precipitation features. The main atmospheric processes identified are: (1) the presence of a regional-scale cyclonic circulation strengthening during the afternoon, (2) diurnal thermally driven circulations at local scale, including upslope (downslope) wind and moisture transport during the day (night), (3) channelization of the upslope moisture transport from the Amazon along the Apurimac valleys toward the western part of the cordillera. © 2017, Springer-Verlag GmbH Germany. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109289
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Subdirección de Ciencias de la Atmósfera e hidrósfera (SCAH), Instituto Geofísico del Perú (IGP), Lima, Peru; Univ. Grenoble Alpes, IRD, CNRS, Grenoble INP, IGE, Grenoble, 38000, France
Recommended Citation:
Junquas C.,Takahashi K.,Condom T.,et al. Understanding the influence of orography on the precipitation diurnal cycle and the associated atmospheric processes in the central Andes[J]. Climate Dynamics,2018-01-01,50(2018-11-12)