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印度洋—西太平洋对流涛动的季节内特征

张净雯 李建平 李艳杰

张净雯, 李建平, 李艳杰. 印度洋—西太平洋对流涛动的季节内特征[J]. 大气科学, 2015, 39(2): 221-234. doi: 10.3878/j.issn.1006-9895.1403.13296
引用本文: 张净雯, 李建平, 李艳杰. 印度洋—西太平洋对流涛动的季节内特征[J]. 大气科学, 2015, 39(2): 221-234. doi: 10.3878/j.issn.1006-9895.1403.13296
ZHANG Jingwen, LI Jianping, LI Yanjie. Intraseasonal Characteristics of the Indo-West Pacific Convection Oscillation[J]. Chinese Journal of Atmospheric Sciences, 2015, 39(2): 221-234. doi: 10.3878/j.issn.1006-9895.1403.13296
Citation: ZHANG Jingwen, LI Jianping, LI Yanjie. Intraseasonal Characteristics of the Indo-West Pacific Convection Oscillation[J]. Chinese Journal of Atmospheric Sciences, 2015, 39(2): 221-234. doi: 10.3878/j.issn.1006-9895.1403.13296

印度洋—西太平洋对流涛动的季节内特征

doi: 10.3878/j.issn.1006-9895.1403.13296
基金项目: 国家自然科学基金重点项目41030961, 91437216, 国家自然科学青年基金项目41205034

Intraseasonal Characteristics of the Indo-West Pacific Convection Oscillation

  • 摘要: 本文利用30~60天带通滤波资料, 考察了不同季节印度洋—西太平洋区域对流活动季节内尺度变率的主要模态, 发现在不同季节赤道东印度洋(5°S~10°N, 70°E~100°E)和西北太平洋(5°N~20°N, 110°E~160°E)对流活动均存在反相变化的关系, 将之称为季节内尺度的印度洋—西太平洋对流涛动(Indo-West Pacific Convection Oscillation), 简称IPCO。对IPCO两极子区域对流活动进行超前滞后相关分析, 发现IPCO事件形成—发展—消亡的生命周期是由对流活动季节内振荡及其传播造成的。对流扰动首先在赤道中西印度洋形成, 随后逐渐向东发展变强, 在其继续变强的过程中将分两支传播:一支由赤道印度洋向北传播, 至印度半岛南部后逐渐减弱消失;另一支沿赤道继续东传, 在海洋大陆受到抑制, 快速越过海洋大陆到达赤道西太平洋后又开始发展变强, 随后北传至西北太平洋区域逐渐减弱, 最终至我国长江流域中下游到日本区域消失。将这一过程划分为8个位相, 详细分析了不同位相对应的环流场和降水场特征, 最后给出了IPCO事件演化示意图。
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  • 收稿日期:  2013-10-30
  • 修回日期:  2014-03-25

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