On the interannual variability of the Bonin high associated with the East Asian summer monsoon rain
On the interannual variability of the Bonin high associated with the East Asian summer monsoon rain
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DOI：
10.1007/s00382-006-0169-x
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发表时间：
2006-07
期刊：
影响因子：
4.6
通讯作者：
K. Ha;Sun‐Seon Lee
中科院分区：
文献类型：
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作者：
K. Ha;Sun‐Seon Lee
为了研究小笠原高压对半岛附近东亚夏季风年际变化的影响，分析了小笠原高压的脉动及其与遥相关型的关系。影响东亚夏季风年际强度的主要因素是博宁高压的中心位置，而不是其中心气压。随着时间的推移，多达12个谐波可以用来重建小笠原高压，展示其季节内变化。博宁高压的年际变化与西藏高压的年际变化相关。这种相关性是占主导地位的东亚夏季风的开始时间，但不是它的撤退。最主要的遥相关型是4月份的西太平洋涛动（WPO），它依赖于小笠原高压的年际变化。在长期的变化，WPO和小笠原高压之间的相关性似乎有助于东亚夏季风的撤退阶段，这本身增加自20世纪70年代中期。此外，自20世纪70年代以来，5月的WPO和西藏相关标志着东亚夏季风的开始而不是撤退。自1970年代中期以来这种高度相关的模式可能是厄尔尼诺现象的结果。
In order to assess how the Bonin high affects interannual variability of the East Asian summer monsoon (EASM) around the Korean Peninsula, the pulsation of the Bonin high and its association with teleconnection patterns was examined. The major factor for the interannual intensity of the EASM is the center position of the Bonin high rather than its center pressure. Up to 12 harmonics over time can be used to reconstruct the Bonin high, demonstrating its intraseasonal variation. The interannual variability of the Bonin high correlates with the Tibet high. This correlation is dominant for the EASM onset time, though not its retreat. The primary teleconnection pattern, reliant up on the interannual variability of the Bonin high, is the Western Pacific oscillation (WPO) in April. In relation to long-term variability, the correlation between the WPO and the Bonin high appears to contribute to the retreat stage of the EASM, which has itself increased since the mid-1970s. Furthermore, the WPO in May and the Tibet correlation has marked the onset rather than the retreat of the EASM since the 1970s. This highly correlated pattern since the mid-1970s may be the result of El Niño.