ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 42 Issue 3 > 2016,42(3):305-313. DOI:10.7519/j.issn.1000-0526.2016.03.005 Prev Next
Analysis on Causes for the Severe Rainfall in Northeastern Zhejiang Induced by Typhoon ChanHom (1509)
- Article
- Figures
- Metrics
- Preview PDF
- Reference
- Related
- Cited by
- Materials
Abstract:
This paper analyzes the cause of the extremely heavy rainfall in northeastern Zhejiang induced by Typhoon ChanHom (1509) from 10 to 11 July 2015 by using conventional observation, AWS data, satellite and NECP reanalysis data. The results show that under the effect of the special terrain in northeast of Zhejiang, strong intensity and wild impaction of ChanHom meeting with the longtime northeast airflow contributed for this heavy rain process. During the early stage of the ChanHom impact, this area was in a state of convective instability. Besides, the abundant water vapor, lowlevel convergence and upperlevel divergence provided a beneficial condition for the heavy rainfall. In the rainstorm areas, the MPV1 changed from negative to positive at low level, leading to an increase of vertical vorticity. The longtime maintenance of the high θse energy region at 925 hPa also benefited the updraft. The longtime transportation of water vapor was not only favorable for ChanHom’s maintenance, but also beneficial to the formation of the heavy rainfall. There was a positive correlation of 6-12 h in advance for the increasing and decreasing of the heavy rainfall with the vapor transportation, surface convergence zone and θse at 925 hPa. And the special topography enhanced the heavy rainfall supported by the northeast airflow because of the effects of the upslope and terrain convergence, which were formed by the trumpetshaped terrain of Hangzhou Bay, Siming Mountain, elongated northeastsouthwest Xiangshan Harbor and its southern mountains.
Keywords:
Project Supported:
Clc Number:
Mobile website
