DOI: 10.1002/joc.5341
论文题名: Intra-seasonal rainfall variability in the Amazon basin related to large-scale circulation patterns: a focus on western Amazon–Andes transition region
作者: Paccini L. ; Espinoza J.C. ; Ronchail J. ; Segura H.
刊名: International Journal of Climatology
ISSN: 8998418
出版年: 2018
卷: 38, 期: 5 起始页码: 2386
结束页码: 2399
语种: 英语
英文关键词: Andes
; winds circulation
; circulation patterns
; Intra-seasonal variability
; western Amazon
Scopus关键词: Chirp modulation
; Climatology
; Conformal mapping
; Rain
; Remote sensing
; Self organizing maps
; Wind
; Atmospheric circulation
; Atmospheric circulation patterns
; Circulation patterns
; Information concerning
; Intra-seasonal variabilities
; Large-scale circulation patterns
; Neural network techniques
; western Amazon
; Rain gages
英文摘要: This study aims to relate the intra-seasonal rainfall variability over the Amazon basin to atmospheric circulation patterns (CPs), with particular attention to extreme rainfall events in the Amazon–Andes region. The CPs summarize the intra-seasonal variability of atmospheric circulation and are defined using daily low-level winds from the ERA-Interim (1.5° × 1.5°) reanalysis for the 1979–2014 period. Furthermore, observational data of precipitation and high-resolution TRMM 3B42 (∼25 km), 2A25 PR (∼5 km) and CHIRPS (∼5 km) data products are related to the CPs throughout the Amazon basin. Nine CPs are determined using a hybrid method that combines a neural network technique (self-organizing maps, SOM) and hierarchical ascendant classification. The CPs are characterized by a specific cycle with alternative transitions and a duration of 14 days on average. This configuration initially results in northerly winds to southerly winds towards the northern or eastern Amazon basin. The related rainfall suggests that it is driven mainly by CP dynamics. In addition, we demonstrate a good agreement amongst the four rainfall data sets: observed precipitation, TRMM 3B42, TRMM 2A25 PR and CHIRPS. Furthermore, special attention is given to the Amazon–Andes transition region. Over this region, two particular CPs (CP4 and CP5) are identified as the key contributors of maximum and minimum daily rainfall, respectively. Thus, during the dry season, 40.8% (11.4%) of the CP5 (CP4) days demonstrate rainfall of less than 1 mm day−1, while during the wet season, 6.2% (14.6%) of the CP5 (CP4) days show rainfall amounts higher than the seasonal 90th percentile (10.4 mm day−1). This study provides additional information concerning the intra-seasonal circulation variability in Amazonia and demonstrates the value of using remote sensing precipitation data in this region as a tool for forecast in areas lacking observable information. © 2017 Royal Meteorological Society Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/116943
Appears in Collections: 气候减缓与适应
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作者单位: Instituto Geofísico del Perú (IGP), Subdirección de Ciencias de la Atmósfera e Hidrósfera (SCAH), Peru; Université Paris Diderot, Sorbonne Paris Cité, UMR Locean (Sorbonne Universités- UPMC-, CNRS, IRD, MNHN), France; IGE (Univ. Grenoble Alpes, IRD, CNRS, Grenoble INP), France
Recommended Citation:
Paccini L.,Espinoza J.C.,Ronchail J.,et al. Intra-seasonal rainfall variability in the Amazon basin related to large-scale circulation patterns: a focus on western Amazon–Andes transition region[J]. International Journal of Climatology,2018-01-01,38(5)