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首页> 外文期刊>Climate dynamics >Role of the global oceans and land-atmosphere interaction on summertime interdecadal variability over northern Argentina
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Role of the global oceans and land-atmosphere interaction on summertime interdecadal variability over northern Argentina

机译：全球海洋和陆地-大气相互作用对阿根廷北部夏季年代际变率的作用

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摘要

This study uses experiments with an atmospheric general circulation model (AGCM) to address the role of the oceans and the effect of land-atmosphere coupling on the predictability of summertime rainfall over northern Argentina focusing on interdecadal time scales during 1901-2006. Ensembles of experiments where the AGCM is forced with historical sea surface temperature (SST) in the global, Pacific and tropical-North Atlantic domains are used. The role of land-atmosphere interaction is assessed comparing the output of simulations with active and climatological soil moisture. A maximum covariance analysis between precipitation and SST reveals the impact of the Pacific Decadal Oscillation, the Atlantic Multi-decadal Oscillation and the equatorial-tropical South Atlantic on rainfall over northern Argentina. Model simulations further show that while the dominant influence comes from the Pacific basin, the Atlantic influence can explain a large transition from dry to wet decades over northern Argentina during the beginning of the 1970s. Analysis of anomalies before and after the transition reveals an upper level anticyclonic circulation off the Patagonian coast with barotropic structure. This circulation enhances the moisture transport and convergence in northern Argentina and, together with enhanced evaporation, increased the rainfall after 1970. The SST pattern is dominated by cold conditions in the equatorial Atlantic and warm eastern Pacific and South Atlantic. We also found that land-atmosphere interaction leads to a representation of the long term rainfall evolution over northern Argentina that is closer to the observed one. Moreover, it leads to a smaller dispersion among ensemble members, thus resulting in a larger signal-to-noise ratio.
机译：这项研究使用大气总环流模型（AGCM）进行的实验来研究海洋的作用以及陆-气耦合对阿根廷北部夏季降水可预测性的影响，重点是年代际时间尺度（1901-2006年）。使用了在全球，太平洋和热带北大西洋区域中，AGCM受到历史海面温度（SST）强迫的实验集合。通过将模拟输出与活跃的和气候的土壤湿度进行比较，评估了土地-大气相互作用的作用。降水和海表温度之间的最大协方差分析揭示了太平洋年代际振荡，大西洋多年代际振荡和赤道南大西洋对阿根廷北部降水的影响。模型模拟进一步表明，尽管主要影响力来自太平洋盆地，但大西洋的影响力可以解释1970年代初阿根廷北部从干旱到潮湿几十年的巨大转变。过渡前后的异常分析显示，巴塔哥尼亚沿岸有正压构造的高层反气旋环流。这种循环增强了阿根廷北部的水汽输送和汇聚，并增加了蒸发，增加了1970年以后的降雨。SST模式主要是赤道大西洋，温暖的东太平洋和南大西洋的寒冷条件。我们还发现，陆地与大气之间的相互作用导致了阿根廷北部长期降雨演变的一种表现，这与观测到的更为接近。而且，这导致合奏部件之间的色散较小，从而导致较大的信噪比。

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  • 来源
    《Climate dynamics》 |2014年第8期|1733-1753|共21页
  • 作者

    Marcelo Barreiro; Nicolas Diaz; Madeleine Renom;

  • 作者单位

    Unidad de Ciencias de la Atmosfera, Instituto de Fisica, Facultad de Ciencias, Universidad de la Republica, Igua 4225, 11400 Montevideo, Uruguay;

    Unidad de Ciencias de la Atmosfera, Instituto de Fisica, Facultad de Ciencias, Universidad de la Republica, Igua 4225, 11400 Montevideo, Uruguay;

    Unidad de Ciencias de la Atmosfera, Instituto de Fisica, Facultad de Ciencias, Universidad de la Republica, Igua 4225, 11400 Montevideo, Uruguay;

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  • 正文语种 eng
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  • 关键词

    Northern Argentina; Interdecadal; Rainfall variability; Land-atmosphere interaction; Predictability;

    机译：阿根廷北部;年代际降雨变化;陆地-大气相互作用;可预测性;

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