Tropical cyclogenesis induced by ITCZ breakdown in association with synoptic wave train over the western North Pacific
Tropical cyclogenesis induced by ITCZ breakdown in association with synoptic wave train over the western North Pacific
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ITCZ 分解引起的热带气旋生成与西北太平洋天气波列相关
DOI：
10.1002/asl2.452
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发表时间：
2013-10
影响因子：
3
通讯作者：
Chen, Wen
中科院分区：
文献类型：
--
作者：
Cao, Xi;Chen, Guanghua;Chen, Wen
与东太平洋和东大西洋相比，与热带辐合带(ITCZ)破裂有关的热带气旋发生在西北太平洋(WNP)上的记录较少。通过观测分析和数值模拟，研究了2006年夏季西北太平洋地区热带气旋发生的典型个例，即热带气旋是由天气尺度波列(SWT)与ITCZ破裂共同诱发的。观测分析表明，在ITCZ破裂前几天，一个西北-东南方向的SWT向西北方向发展并向西北方向传播。此外，通过对模拟结果的比较，揭示了SWT在ITCZ击穿中的作用。一方面，ITCZ区内的SWT增强了位涡，增强了经向位涡梯度，并产生了明显的位涡反转，有利于ITCZ的分解；另一方面，与ITCZ以北的SWT相关的反气旋环流异常可以减小经向PV波段的尺度，从而增大经向PV梯度，从而加速ITCZ的破裂。
Compared to the eastern Pacific and eastern Atlantic, tropical cyclogenesis associated with breakdown of the intertropical convergence zone (ITCZ) was less documented over the western North Pacific (WNP). A typical case in boreal summer 2006 over the WNP, in which tropical cyclogenesis is induced by ITCZ breakdown in association with synoptic‐scale wave train (SWT), is examined through observation analysis and numerical simulations. Observational analysis displays that a northwest–southeast‐oriented SWT developed and propagated northwestward several days prior to ITCZ breakdown. Furthermore, the comparisons of simulation results reveal the role of the SWT in ITCZ breakdown. On one hand, the SWT within the ITCZ region is conducive to break down the ITCZ by enhancing the potential vorticity (PV), strengthening the meridional PV gradient and producing an evident sign reversal of PV gradient. On the other hand, the anomalous anticyclonic circulation related to the SWT north of ITCZ can reduce the meridional scale of PV band and thus increase the meridional PV gradient to accelerate ITCZ breakdown.
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影响因子：
2.9
作者：
B. Fu;Tim Li;M. Peng;F. Weng
通讯作者：
B. Fu;Tim Li;M. Peng;F. Weng
影响因子：
3.1
作者：
T. Tsuda;T. Inoue;S. Kato;S. Fukao;D. Fritts;T. Vanzandt
通讯作者：
T. Tsuda;T. Inoue;S. Kato;S. Fukao;D. Fritts;T. Vanzandt
影响因子：
3.2
作者：
T. Yabe;R. Tanaka;T. Nakamura;F. Xiao
通讯作者：
T. Yabe;R. Tanaka;T. Nakamura;F. Xiao
影响因子：
3.1
作者：
D. Waliser;K. Lau;Jae-Hoon Kim
通讯作者：
D. Waliser;K. Lau;Jae-Hoon Kim
DOI：
10.1111/j.1600-0870.2009.00435.x
发表时间：
2010-01
期刊：
Tellus A: Dynamic Meteorology and Oceanography
影响因子：
--
作者：
Kyle D. Krouse;A. Sobel
通讯作者：
Kyle D. Krouse;A. Sobel