Eastern Patagonia Seasonal Precipitation: Influence of Southern Hemisphere Circulation and Links with Subtropical South American Precipitation
Eastern Patagonia Seasonal Precipitation: Influence of Southern Hemisphere Circulation and Links with Subtropical South American Precipitation
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东巴塔哥尼亚季节性降水：南半球环流的影响及其与南美副热带降水的联系
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
R. Compagnucci
中科院分区：
文献类型：
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作者：
A. Berman;Gabriel Silvestri;R. Compagnucci
巴塔哥尼亚东部是南美洲最南端的地区，位于安第斯山脉以东，本文研究了巴塔哥尼亚东部季节降水的某些方面。结果表明，中北部地区，南部大陆区，最南端的岛屿是三个独立的区域的季节性降水，他们每个人都与特定的大气环流模式。中北部地区的降水量与南美洲南部安第斯山脉以东广大地区的降水量在四季中有显著的相关。这一地区降水的增强（减少）与该地区西风气流的减弱（增强）有关。南美大陆南部地区春、夏、秋三季的降水与南美副热带地区降水的偶极型有着密切的联系。与副热带偶极子有关的低层和高层大气环流异常也能对热带气旋的形成起重要作用。
AbstractSome aspects of the seasonal precipitation over eastern Patagonia, the southernmost area of South America east of the Andes Cordillera, are examined in this paper. Results indicate that the central-north areas, the southern continental region, and the southernmost islands are three independent regions of seasonal precipitation, and that each of them is associated with specific patterns of atmospheric circulation. Precipitation over the central-north region is significantly related to the precipitation over a wide area of southern South America east of the Andes during the four seasons. Enhanced (reduced) precipitation over this area is associated with weakened (intensified) westerly flow in the region. Precipitation over the southern continental area has a close connection with the dipolar pattern of precipitation over subtropical South America during spring, summer, and autumn. The anomalies of atmospheric circulation at low and upper levels associated with the subtropical dipole are also able to...