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首页> 外文期刊>Paleoceanography >High-Resolution Modeling of ENSO-Induced Precipitation in the Tropical Andes: Implications for Proxy Interpretation
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High-Resolution Modeling of ENSO-Induced Precipitation in the Tropical Andes: Implications for Proxy Interpretation

机译：热带andes中肠道沉淀的高分辨率建模：对代理解释的影响

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Sediment records from Lake Pallcacocha, Ecuador, have been interpreted as proxies of El Ni?o-Southern Oscillation (ENSO) variability, owing to increased precipitation in the area during El Ni?o events. However, the lake's watershed receives precipitation from processes arising from both the eastern and western Andes, where ENSO has different impacts; this has led to ambiguity in observed regional ENSO signals and has consequently challenged the suitability of the lake's records as ENSO proxies. Here, a mesoscale weather prediction model is used to investigate the regional circulation dynamics and precipitation response during different ENSO events, namely, Eastern Pacific (EP), Central Pacific (CP), coastal El Ni?o (COA), and La Ni?a (LN). The region receives more accumulated precipitation during COA and LN compared to EP and CP events. However, during EP and COA events, the region is prone to extreme precipitation associated with convective bursts originating from the Pacific. During CP and LN, moisture originates from the Atlantic and may reach the area as broader-scale less-intense precipitation. Statistical analysis of modeled precipitation reveals consistency between the number of threshold-exceeding precipitation events in the high Andean elevations and the number of events identified in the late Holocene Pallcacocha record. These results illustrate the importance of considering ENSO flavors when interpreting paleoclimate proxies, highlight the role of COA events in understanding eastern Pacific proxy records, and support the hypothesis that Holocene changes in the number of events recorded in the lake sediment may indicate a change in the relative frequency of ENSO flavors.
机译：来自厄瓜多尔湖Pallcacocha湖的沉积物记录被解释为EL NI的代理（ENSO）可变性，因为在EL NI的情况下，该区域的降水量增加了。然而，湖的流域从东部和西部和西部和西部的过程中获得降水，其中enso有不同的影响;这导致了观察到的区域ENSO信号中的模糊性，因此挑战了湖泊记录作为ENSO代理的适用性。在这里，Mescle天气预报模型用于调查不同ENSO事件的区域循环动态和降水反应，即东太平洋（EP），中央太平洋（CP），沿海El Ni？O（CoA）和La Ni？ a（ln）。与EP和CP事件相比，该区域在COA和LN期间接收更累计的降水。然而，在EP和COA事件期间，该地区容易与来自太平洋的对流爆发相关的极度降水。在CP和LN期间，水分起源于大西洋，并可能达到该地区，以较宽较宽较小的降水。模型降水的统计分析揭示了高中升高的阈值沉淀事件的数量与全新世普科科科记录晚期鉴定的事件数量之间的一致性。这些结果说明了在解释古古镇代理时考虑enso口味的重要性，突出COA事件在了解东部太平洋代理记录时的作用，并支持湖泊沉积物中记录的事件数量的全新世变化可能表明变化Enso Flavors的相对频率。

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