globalchange  > 影响、适应和脆弱性
DOI: 10.1007/s00382-017-3994-1
Scopus记录号: 2-s2.0-85032835531
论文题名:
Seasonal cycle of precipitation variability in South America on intraseasonal timescales
作者: Vera C.S.; Alvarez M.S.; Gonzalez P.L.M.; Liebmann B.; Kiladis G.N.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2018
卷: 51, 期:2018-05-06
起始页码: 1991
结束页码: 2001
语种: 英语
英文关键词: OLR ; SACZ ; Subseasonal ; Teleconnections
Scopus关键词: longwave radiation ; Madden-Julian oscillation ; precipitation (climatology) ; seasonal variation ; spatial distribution ; teleconnection ; South America
英文摘要: The seasonal cycle of the intraseasonal (IS) variability of precipitation in South America is described through the analysis of bandpass filtered outgoing longwave radiation (OLR) anomalies. The analysis is discriminated between short (10–30 days) and long (30–90 days) intraseasonal timescales. The seasonal cycle of the 30–90-day IS variability can be well described by the activity of first leading pattern (EOF1) computed separately for the wet season (October–April) and the dry season (May–September). In agreement with previous works, the EOF1 spatial distribution during the wet season is that of a dipole with centers of actions in the South Atlantic Convergence Zone (SACZ) and southeastern South America (SESA), while during the dry season, only the last center is discernible. In both seasons, the pattern is highly influenced by the activity of the Madden–Julian Oscillation (MJO). Moreover, EOF1 is related with a tropical zonal-wavenumber-1 structure superposed with coherent wave trains extended along the South Pacific during the wet season, while during the dry season the wavenumber-1 structure is not observed. The 10–30-day IS variability of OLR in South America can be well represented by the activity of the EOF1 computed through considering all seasons together, a dipole but with the stronger center located over SESA. While the convection activity at the tropical band does not seem to influence its activity, there are evidences that the atmospheric variability at subtropical-extratropical regions might have a role. Subpolar wavetrains are observed in the Pacific throughout the year and less intense during DJF, while a path of wave energy dispersion along a subtropical wavetrain also characterizes the other seasons. Further work is needed to identify the sources of the 10–30-day-IS variability in South America. © 2017, Springer-Verlag GmbH Germany.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109124
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: Departamento de Ciencias de la Atmósfera y los Océanos, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina; Centro de Investigaciones del Mar y la Atmósfera (CIMA), Instituto Franco-Argentino del Clima y sus Impactos (UMI-IFAECI)/CNRS, CONICET-Universidad de Buenos Aires, Buenos Aires, Argentina; Department of Meteorology, University of Reading, Reading, United Kingdom; National Centre for Atmospheric Science, University of Reading, Reading, United Kingdom; CIRES, University of Colorado Boulder, Boulder, CO, United States; Physical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO, United States

Recommended Citation:
Vera C.S.,Alvarez M.S.,Gonzalez P.L.M.,et al. Seasonal cycle of precipitation variability in South America on intraseasonal timescales[J]. Climate Dynamics,2018-01-01,51(2018-05-06)
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