Analysis of Tropical Cyclogenesis in the Western North Pacific for 2000 and 2001
Analysis of Tropical Cyclogenesis in the Western North Pacific for 2000 and 2001
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DOI：
10.1175/waf1013.1
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发表时间：
2007-08
影响因子：
2.9
通讯作者：
B. Fu;Tim Li;M. Peng;F. Weng
中科院分区：
文献类型：
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作者：
B. Fu;Tim Li;M. Peng;F. Weng
摘要利用高分辨率卫星资料和NCEP-NCAR再分析资料，分析了2000年和2001年台风季北太平洋西部34次热带气旋形成事件。在形成前阶段确定了三种类型的天气尺度扰动。它们是热带气旋能量弥散（TCEDs）、与预先存在的TCs无关的天气波列（SWTs）和东风波（EWs）。34例TC发生中，6例与tced相关，11例与swt相关，7例与EWs相关。本文的分析表明，TCED的发生取决于TC强度和背景气流，强气旋和弱背景东风更有可能诱发罗斯比波列。并不是所有的罗斯比波列都会形成新的TC。11例SWT中有4例由赤道混合罗斯-重力波触发。与EWs相关的气旋形成事件是通过向西移动来确定的。
Abstract High-resolution satellite data and NCEP–NCAR reanalysis data are used to analyze 34 tropical cyclone (TC) genesis events in the western North Pacific during the 2000 and 2001 typhoon seasons. Three types of synoptic-scale disturbances are identified in the pregenesis stages. They are tropical cyclone energy dispersions (TCEDs), synoptic wave trains (SWTs) unrelated to preexisting TCs, and easterly waves (EWs). Among the total 34 TC genesis cases, 6 are associated with TCEDs, 11 cases are associated with SWTs, and 7 cases are associated with EWs. The analyses presented herein indicate that the occurrence of a TCED depends on the TC intensity and the background flow, with stronger cyclones and weaker background easterlies being more likely to induce a Rossby wave train. Not all Rossby wave trains would lead to the formation of a new TC. Among the 11 SWT cases, 4 cases are triggered by equatorial mixed Rossby–gravity waves. Cyclogenesis events associated with EWs are identified by the westward propa...