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首页> 外文期刊>Journal of hydrometeorology >Impacts of Large-Scale Soil Moisture Anomalies on the Hydroclimate of Southeastern South America
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Impacts of Large-Scale Soil Moisture Anomalies on the Hydroclimate of Southeastern South America

机译：大规模土壤水分异常对南美洲东南部水池的影响

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摘要

The La Plata basin (LPB), located in southeastern South America (SESA), is a region of significant socioeconomic importance, particularly for agriculture. This area of South America exhibits strong land-atmosphere coupling in the warm season. In this work, we evaluate the impact of large-scale soil moisture (SM) anomalies on regional-scale atmospheric conditions. Multivariate empirical orthogonal function (EOF) analysis is used to extract the dominant modes of joint variability of monthly averaged root-zone SM and 1-month-lagged precipitation from atmospheric reanalyses. We find that the dominant EOF pattern is consistent with a positive correlation between antecedent SM and precipitation, while the second dominant EOF pattern is consistent with a negative correlation between these variables. To evaluate causality, the effects of large-scale SM anomalies on atmospheric variables are examined using the Community Earth System Model (CESM). CESM simulations suggest that anomalously dry SM is initially collocated with decreased precipitation. Subsequent changes in the atmospheric circulation associated with a thermal low draw moisture into the region, eventually promoting increased precipitation. This study investigates the pathways through which SM anomalies modulate precipitation in this region. For this reason, this study has potential atmospheric prediction applications that could benefit the population and the socioeconomic well-being of this important region.
机译：拉普拉塔盆地（LPB）位于南美洲东南部（SESA），是一个具有重要社会经济意义的地区，尤其是对农业而言。南美洲的这一地区在暖季表现出强烈的陆气耦合。在这项工作中，我们评估了大规模土壤水分（SM）异常对区域尺度大气条件的影响。利用多变量经验正交函数（EOF）分析从大气再分析中提取月平均根区SM和滞后1个月降水量联合变化的主导模式。我们发现，主导EOF模式与前期SM和降水量之间的正相关一致，而第二主导EOF模式与这些变量之间的负相关一致。为了评估因果关系，使用社区地球系统模型（CESM）研究了大尺度SM异常对大气变量的影响。CESM模拟表明异常干燥的SM最初与降水量减少相匹配。与热低压相关的大气环流的后续变化将水分吸入该地区，最终促进降水增加。本研究调查了SM异常调节该地区降水的途径。因此，这项研究具有潜在的大气预测应用，可能有益于这一重要地区的人口和社会经济福祉。

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