The Relationship between the North Atlantic Jet and Tropical Convection over the Indian and Western Pacific Oceans
The Relationship between the North Atlantic Jet and Tropical Convection over the Indian and Western Pacific Oceans
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DOI：
10.1175/2011jcli4203.1
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发表时间：
2011-12
影响因子：
4.9
通讯作者：
Jiacan Yuan;S. Feldstein;Sukyoung Lee;B. Tan
中科院分区：
文献类型：
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作者：
Jiacan Yuan;S. Feldstein;Sukyoung Lee;B. Tan
摘要：利用欧洲中期天气预报再分析中心 (ERA-40) 40 年数据研究了北大西洋冬季急流变率，其中变率由七个垂直高度上纬向风的第一个 EOF 定义。该 EOF 的主成分时间序列称为喷射指数。模式相关分析表明，急流指数比北大西洋涛动 (NAO) 更准确地描述了季节内北大西洋纬向风的变化。基于热带印度洋和西太平洋季内对流降水事件的一系列急流指数综合计算揭示了以下统计上显着的关系：1）负急流事件导致印度洋降水增加，2）正急流事件滞后于印度洋降水增强，3）正急流事件导致西太平洋降水增加，4）负急流事件滞后于西太平洋降水增强。
AbstractBoreal winter jet variability over the North Atlantic is investigated using 40-yr European Centre for Medium-Range Weather Forecasts Re-Analysis (ERA-40) data, where the variability is defined by the first EOF of the zonal wind on seven vertical levels. The principal component time series of this EOF is referred to as the jet index. A pattern correlation analysis indicates that the jet index more accurately describes intraseasonal North Atlantic zonal wind variability than does the North Atlantic Oscillation (NAO). A series of composite calculations of the jet index based on events of intraseasonal convective precipitation over the tropical Indian and western Pacific Oceans reveals the following statistically significant relationships: 1) negative jet events lead enhanced Indian Ocean precipitation, 2) positive jet events lag enhanced Indian Ocean precipitation, 3) positive jet events lead enhanced western Pacific Ocean precipitation, and 4) negative jet events lag enhanced western Pacific Ocean p...