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首页> 外文期刊>Climate dynamics >Summer precipitation variability over South America on long and short intraseasonal timescales
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Summer precipitation variability over South America on long and short intraseasonal timescales

机译：长期内和短期内南美洲夏季降水变化

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摘要

A dipole pattern in convection between the South Atlantic convergence zone and the subtropical plains of southeastern South America characterizes summer intraseasonal variability over the region. The dipole pattern presents two main bands of temporal variability, with periods between 10 and 30 days, and 30 and 90 days; each influenced by different large-scale dynamical forcings. The dipole activity on the 30-90-day band is related to an eastward traveling wavenumber-1 structure in both OLR and circulation anomalies in the tropics, similar to that associated with the Madden-Julian oscillation. The dipole is also related to a teleconnection pattern extended along the South Pacific between Australia and South America. Conversely, the dipole activity on the 10-30-day band does not seem to be associated with tropical convection anomalies. The corresponding circulation anomalies exhibit, in the extratropics, the structure of Rossby-like wave trains, although their sources are not completely clear.
机译：南大西洋收敛带和南美东南部亚热带平原之间的对流偶极子模式表征了该地区夏季的季节内变化。偶极子图呈现两个主要的时间变化带，周期在10到30天之间，以及30到90天之间。每个都受到不同的大规模动力的影响。在30-90天波段的偶极子活动与OLR中的向东行波数结构和热带的环流异常有关，类似于与Madden-Julian振荡有关的活动。偶极子也与澳大利亚和南美之间沿南太平洋延伸的遥相关模式有关。相反，在10-30天波段的偶极子活动似乎与热带对流异常无关。在温带中，相应的环流异常表现出类似Rossby的波列结构，尽管其来源尚不完全清楚。

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  • 来源
    《Climate dynamics》 |2014年第8期|1993-2007|共15页
  • 作者

    Paula L. M. Gonzalez; Carolina S. Vera;

  • 作者单位

    International Research Institute for Climate and Society, Columbia University, 61 Route 9W, 202b Monell, Palisades, NY 10964, USA;

    Centro de Investigaciones del Mar y la Atmosfera (CIMA/CONICET-UBA), DCAO/FCEN, UMI IFAECI/CNRS 2do piso, Pabellon Ⅱ, Ciudad Universitaria, 1428 Buenos Aires, Argentina;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Summer precipitation; Intraseasonal variability; South America; SASS; MJO;

    机译：夏季降水;季节内变化;南美洲;SASS;MJO;

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