Opposing oceanic and atmospheric ENSO influences on the Ross Sea Region, Antarctica
Opposing oceanic and atmospheric ENSO influences on the Ross Sea Region, Antarctica
复制标题
海洋和大气 ENSO 对南极洲罗斯海地区的相反影响
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
P. Barrett
中科院分区：
文献类型：
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作者：
N. Bertler;T. Naish;P. A. Mayewski;P. Barrett
抽象。在这里，我们讨论的原因和影响相反的大气和海洋ENSO强迫在罗斯海，导致净变暖在东部罗斯海和净冷却在西部罗斯海在厄尔尼诺年。在拉尼娜年，情况正好相反。与拉尼娜时期相比，厄尔尼诺年的海洋ENSO效应导致约1 K的变暖，滞后3个月。在厄尔尼诺事件期间，大气ENSO效应导致阿蒙森海低压的转移和减弱，导致更冷的西南极气团进入罗斯海西部。我们发现，这种间接的ENSO效应在罗斯海西部比直接效应（~1 K）强约一个数量级（高达15 K），导致厄尔尼诺期间的净冷却和拉尼娜事件期间的净变暖。
Abstract. Here we discuss the cause and effect of opposing atmospheric and oceanic ENSO forcings in the Ross Sea, that lead to a net warming in the eastern Ross Sea and a net cooling in the western Ross Sea during El Nino years. During La Nina years the opposite is observed. The oceanic ENSO effect causes a ~1 K warming with a 3 month lag during El Nino years in comparison to La Nina time periods. During El Nino events, the atmospheric ENSO effect leads to a shift and weakening of the Amundsen Sea Low, causing enhanced import of colder West Antarctic air masses into the western Ross Sea. We find that this indirect ENSO effect is about one order of magnitude stronger (up to 15 K) in the western Ross Sea than the direct effect (~1 K), leading to a net cooling during El Nino and net warming during La Nina events.