Characteristics of Binary Tropical Cyclones Observed in the Western North Pacific for 62 Years (1951–2012)
Characteristics of Binary Tropical Cyclones Observed in the Western North Pacific for 62 Years (1951–2012)
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DOI：
10.1175/mwr-d-14-00331.1
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发表时间：
2015-05
影响因子：
3.2
通讯作者：
W. Jang;H. Chun
中科院分区：
文献类型：
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作者：
W. Jang;H. Chun
摘要利用最佳跟踪和再分析资料，研究了北太平洋西部（WNP） 62年来双热带气旋（tc）的统计和动力特征。共发生98例二元tc，年均1.58例。双tc的发生频率呈显著的年际变化，在20世纪60年代中期和90年代初出现了两个高峰。4 / 3（76.3%）的二元tc发生在7 - 9月，这与总体tc的高活跃季节一致。在总tc最大径迹密度的东面，二元tc的径迹密度相对较高。这一结果可能是由于二元和总tc之间的成因位置和环境导向流的差异。双tc具有极向转向流、较弱的垂直风切变和较高的海面温度，这些都导致tc寿命更长，从而增加了…
AbstractThe statistical and dynamical characteristics of binary tropical cyclones (TCs) observed in the western North Pacific (WNP) for 62 years (1951–2012) are investigated by using best track and reanalysis data. A total of 98 binary TCs occurred with an annual average of 1.58. The occurrence frequency of binary TCs shows significant year-to-year variations and there are two peaks in the mid-1960s and early 1990s. Three-fourths (76.3%) of the binary TCs occurred between July and September, which is consistent with the high activity season of TCs in general. A relatively higher track density for binary TCs is present to the east of the maximum track density for total TCs. This result is likely due to the differences in the locations of genesis and environmental steering flow between binary and total TCs. The poleward steering flow, weaker vertical wind shear, and warmer sea surface temperature are pronounced for binary TCs, and these result in a longer lifetime of TCs, which can increase the chances that...