Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1007/s00382-017-3994-1 |
Seasonal cycle of precipitation variability in South America on intraseasonal timescales | |
Vera, Carolina S.1,2; Alvarez, Mariano S.1,2; Gonzalez, Paula L. M.3,4; Liebmann, Brant5,6; Kiladis, George N.6 | |
2018-09-01 | |
发表期刊 | CLIMATE DYNAMICS |
ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2018 |
卷号 | 51页码:1991-2001 |
文章类型 | Article |
语种 | 英语 |
国家 | Argentina; England; USA |
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. |
英文关键词 | Subseasonal OLR SACZ Teleconnections |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000442433200022 |
WOS关键词 | TROPICAL EXTRATROPICAL INTERACTIONS ; SUMMER PRECIPITATION ; COLD SEASON ; ANOMALIES ; WAVES ; CIRCULATION ; OSCILLATION |
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/35613 |
专题 | 气候变化 |
作者单位 | 1.Univ Buenos Aires, Fac Ciencias Exactas & Nat, Dept Ciencias Atmosfera & Oceanos, Buenos Aires, DF, Argentina; 2.Univ Buenos Aires, CONICET, CIMA,CNRS, Inst Franco Argentino Clima & Impactos,UMI,IFAECI, Buenos Aires, DF, Argentina; 3.Univ Reading, Dept Meteorol, Reading, Berks, England; 4.Univ Reading, Natl Ctr Atmospher Sci, Reading, Berks, England; 5.Univ Colorado, CIRES, Boulder, CO 80309 USA; 6.NOAA, Phys Sci Div, Earth Syst Res Lab, Boulder, CO USA |
推荐引用方式 GB/T 7714 | Vera, Carolina S.,Alvarez, Mariano S.,Gonzalez, Paula L. M.,et al. Seasonal cycle of precipitation variability in South America on intraseasonal timescales[J]. CLIMATE DYNAMICS,2018,51:1991-2001. |
APA | Vera, Carolina S.,Alvarez, Mariano S.,Gonzalez, Paula L. M.,Liebmann, Brant,&Kiladis, George N..(2018).Seasonal cycle of precipitation variability in South America on intraseasonal timescales.CLIMATE DYNAMICS,51,1991-2001. |
MLA | Vera, Carolina S.,et al."Seasonal cycle of precipitation variability in South America on intraseasonal timescales".CLIMATE DYNAMICS 51(2018):1991-2001. |
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