Synoptic Development of the Hanoi Heavy Rainfall Event of 30-31 October 2008: Multiple-Scale Processes
Synoptic Development of the Hanoi Heavy Rainfall Event of 30-31 October 2008: Multiple-Scale Processes
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DOI：
10.1175/mwr-d-11-00111.1
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发表时间：
2012-04-01
影响因子：
3.2
通讯作者：
Alpert, Jordan
中科院分区：
文献类型：
--
作者：
Chen, Tsing-Chang;Yen, Ming-Cheng;Alpert, Jordan
2008年10月30日至31日，越南河内发生的特大洪水（HRF）事件比越南其他事件发生得更靠北。在中纬-热带相互作用的背景下，用多尺度过程探讨了这一事件的成因。在中纬度地区，与河内事件有关的冷涌可以向西追溯到阿尔泰山和天山之间的背风气旋生成。该气旋发展成白令海爆发性气旋后，与河内HRF事件同时发生。10月26日，在菲律宾以南的热带地区，一股东风扰动、西里伯斯海已有的一个小型表面涡旋和东亚冷涌气流相互作用，形成了一股冷涌涡旋。该冷涌涡发展成气旋，与冷涌流的地面高压并列，并建立了从南海到河内的强潮湿东南风，帮助维持了HRF事件。对河内热带气旋南北纬向风和河内降水的谱分析表明，存在三个季风模态：30-60、12-24和5个季风模态。冷涌涡发展成HRF气旋与三个季风模态的同相建设性干扰相结合，而河内HRF事件的水文维持西北水汽通量进入河内这些季风模态。
The 30-31 October 2008 Hanoi, Vietnam, heavy rainfall-flood (HRF) event occurred unusually farther north than other Vietnam events. The cause of this event is explored with multiple-scale processes in the context of the midlatitude-tropical interaction. In the midlatitudes, the cold surge linked to the Hanoi event can be traced westward to the leeside cyclogenesis between the Altai Mountains and Tianshan. This cyclone developed into a Bering Sea explosive cyclone later, simultaneously with the occurrence of the Hanoi HRF event. In the tropics, a cold surge vortex formed on 26 October, south of the Philippines, through the interaction of an easterly disturbance, an already existing small surface vortex in the Celebes Sea, and the eastern Asian cold surge flow. This cold surge vortex developed into a cyclone, juxtaposed with the surface high of the cold surge flow, and established a strong moist southeasterly flow from the South China Sea to Hanoi, which helped maintain the HRF event. Spectral analysis of the zonal winds north and south of the Hanoi HRF cyclone and rainfall at Hanoi reveal the existence of three monsoon modes: 30-60, 12-24, and 5 clays. The cold surge vortex developed into an HRF cyclone in conjunction with the in-phase constructive interference of the three monsoon modes, while the Hanoi HRF event was hydrologically maintained by the northwestward flux of water vapor into Hanoi by these monsoon modes.