Relationship between Korean Drought and North Pacific Oscillation in May

被引：0
作者：
Choi, Ki-Seon [1 ]
Kim, Do-Woo [1 ]
Lee, Ji-Sun [1 ]
Byun, Hi-Ryong [1 ]
机构：
[1] Pukyong Natl Univ, Dept Environm Atmospher Sci, Daeyeon 3-Dong, Busan 608737, South Korea
来源：
ATMOSPHERE-KOREA | 2009年 / 19卷 / 01期
关键词：
North Pacific Oscillation Index; effective drought index; western North Pacific high; sea surface temperature; sea ice concentration;
D O I：
暂无
中图分类号：
P4 [大气科学（气象学）];
学科分类号：
0706 ; 070601 ;
摘要：
A strong negative correlation has been detected between the North Pacific Oscillation Index (NPI) and the Effective Drought Index (EDI) in May over Korea. In May of positive NPI year, anomalous patterns caused a drought in Korea as follows: the anomalous south-low, north-high low-level pressure patterns in the northeast and southeast of Korea have strengthened the anomalous northerlies to Korea. In addition, these anomalous northerlies have prevented western North Pacific (WNP) high from moving northward. As a result, anomalous descending flows have strengthened in the mid-latitude region in East Asia. In the WNP, the anomalous south-high, north-low sea surface temperature (SST) has been widely distributed, which has strengthened anomalous south-low, north-high low-level pressure patterns. These anomalous characteristics of pressure and SST patterns observed in May of positive NPI years have already been detected in previous winter (December-February) and early spring (March, April). In addition, the anomalous negative sea ice concentration in the North Pacific during two seasons has strengthened the anomalous anticyclonic circulation in the same region and in turn made a contribution to formation of anomalous south-low, north-high pressure patterns in May.
引用
收藏
页码：67 / 78
页数：12
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