Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1007/s00382-018-4590-8 |
New insights into the rainfall variability in the tropical Andes on seasonal and interannual time scales | |
Segura, Hans1; Junquas, Clementine1; Carlo Espinoza, Jhan1,2; Vuille, Mathias3; Jauregui, Yakelyn R.4; Rabatel, Antoine1; Condom, Thomas1; Lebel, Thierry1 | |
2019-07-01 | |
发表期刊 | CLIMATE DYNAMICS |
ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2019 |
卷号 | 53页码:405-426 |
文章类型 | Article |
语种 | 英语 |
国家 | France; Peru; USA |
英文摘要 | In this study, we analyze the atmospheric mechanisms associated with the main rainfall patterns in the tropical Andes (20 degrees S-1*DEG;N) on seasonal and interannual time scales. Using a homogeneous and high spatial resolution precipitation data set (0.05 degrees x0.05 degrees) at monthly time step (CHIRPS; 1981-2016), in-situ precipitation from 206 rain-gauge stations, power spectrum and EOF analysis, we identify three Andean regions characterized by specific seasonal and interannual rainfall modes: the equatorial Andes (EA, 5 degrees S-1*DEG;N), the transition zone (TZ, 8 degrees S-5*DEG;S) and the southern tropical Andes (STA, 20 degrees S-8*DEG;S). On seasonal time scales, the main mode of precipitation in the EA and STA are characterized by a unimodal regime, while the TZ is represented by a bimodal regime. The EA and the TZ share the same wet season in the February-April period, which is associated with a weakened Walker Cell, the southerly position of the Intertropical Convergence Zone (ITCZ) and a strong westward humidity transport from the equatorial Amazon. This latter mechanism and a reduced elevation of the Andes are associated with the October-November wet season in the TZ. The presence of the Bolivian High and the northward extension of the Low Level Jet are associated with the precipitation over Andean regions between 20 degrees S and 8 degrees S in the December-March period. On interannual time scales, extreme monthly wet events (EMWE) in the STA (TZ) are related to convection over the western (equatorial) Amazon during the December-March (February-April) period, showing an atmospheric relationship between the Amazon and the Andes. Extreme monthly dry events (EMDE) in the TZ and in the EA during the February-April period are related to a strengthened Walker Cell, especially in the eastern Pacific. In addition, EMWE (EMDE) in the EA are associated with an anomalous southward (northward) displaced eastern PacificITCZ. Moreover, we find a relationship between precipitation at higher elevations in the Andes north of 10 degrees S and easterly winds at 200 hPa during February-April EMWE. Finally, extreme monthly events in the EA (STA) are related to sea surface temperature anomalies in the western (central) equatorial Pacific. |
英文关键词 | Tropical Andes Precipitation EOF analysis Atmospheric mechanisms Seasonal and interannual variability |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000471722400024 |
WOS关键词 | MONSOON ; WALKER ; TRENDS ; HADLEY ; ENSO |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/184379 |
专题 | 气候变化 |
作者单位 | 1.Univ Grenoble Alpes, CNRS, UMR 5001, IRD,G INP,IGE, F-38000 Grenoble, France; 2.IGP, Lima, Peru; 3.SUNY Albany, Dept Atmospher & Environm Sci, Albany, NY 12222 USA; 4.Univ Washington, Dept Atmospher Sci, Seattle, WA 98195 USA |
推荐引用方式 GB/T 7714 | Segura, Hans,Junquas, Clementine,Carlo Espinoza, Jhan,et al. New insights into the rainfall variability in the tropical Andes on seasonal and interannual time scales[J]. CLIMATE DYNAMICS,2019,53:405-426. |
APA | Segura, Hans.,Junquas, Clementine.,Carlo Espinoza, Jhan.,Vuille, Mathias.,Jauregui, Yakelyn R..,...&Lebel, Thierry.(2019).New insights into the rainfall variability in the tropical Andes on seasonal and interannual time scales.CLIMATE DYNAMICS,53,405-426. |
MLA | Segura, Hans,et al."New insights into the rainfall variability in the tropical Andes on seasonal and interannual time scales".CLIMATE DYNAMICS 53(2019):405-426. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论