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首页> 外文期刊>Journal of Climate >Interannual Shift of the Tropical Upper-Tropospheric Trough and Its Influence on Tropical Cyclone Formation over the Western North Pacific
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Interannual Shift of the Tropical Upper-Tropospheric Trough and Its Influence on Tropical Cyclone Formation over the Western North Pacific

机译：北太平洋西部热带上对流层槽的年际变化及其对热带气旋形成的影响

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摘要

The east-west migration of the tropical upper-tropospheric trough (TUTT) on the interannual time scale and its influence on tropical cyclone (TC) formation over the western North Pacific (WNP) is investigated in this study. Climatologically, the TUTT can be identified from 100 to 400 hPa with a relative vorticity maximum between 150 and 200 hPa. In addition to the strong westerly vertical wind shear in the south flank of the TUTT, this study shows that the cold-core system is associated with low relative humidity and subsidence to the east of the trough axis. As a result, the TC formation is enhanced (suppressed) in the eastern portion of the WNP when the TUTT shifts eastward (westward) on the interannual time scale. The interannual TUTT shift is closely associated with the SST anomalies in the central and eastern tropical Pacific or ENSO phases. The warm (cold) phase of ENSO corresponds to the eastward (westward) shift of the TUTT. The physical factors found to be responsible for the influence of ENSO on TC formation can be associated with the east-west shift of the TUTT. It is shown that the interannual variations of TC formation in the eastern part of the WNP basin are closely associated with the east-west shift of the TUTT due to the associated environmental conditions that are generally not favorable for TC formation.
机译：本文研究了热带对流层高低谷（TUTT）在年际尺度上的东西向迁移及其对北太平洋西部（WNP）热带气旋（TC）形成的影响。在气候学上，TUTT可以在100至400 hPa的范围内被识别，相对涡度最大值在150至200 hPa之间。除了在TUTT的南翼强西风垂直切变外，这项研究还表明，冷芯系统还与较低的相对湿度和低谷轴东部的沉降有关。结果，当TUTT在年际时间尺度上向东（西移）时，WNP东部的TC形成得到增强（抑制）。年中TUTT偏移与中部和东部热带太平洋或ENSO阶段的SST异常密切相关。 ENSO的暖（冷）相对应于TUTT的东移（西移）。发现造成ENSO对TC形成影响的物理因素可能与TUTT的东西向移动有关。结果表明，由于相关的环境条件通常不利于TC的形成，WNP盆地东部地区TC的年际变化与TUTT的东西向变化密切相关。

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