2016 , Vol. 31 >Issue 4: 409 - 421
DOI: https://doi.org/10.11867/j.issn.1001-8166.2016.04.0409.
Case Comparing Study of Downstream Circulation Development during Typhoon Extratropical Transition
First author:Chen Hua(1971-), male, Jianshi County,Hubei Province, Associate Professor. Research areas include mesoscale atmospheric dynamics.E-mail:huach@nuist.edu.cn
Received date: 2015-12-30
Revised date: 2016-03-10
Online published: 2016-04-10
Supported by
Project supported by the National Natural Science Foundation of China “The effects of transforming typhoons on midlatitude jet and its downstream inpacts”(No.41175061)
Copyright
The interaction between extratropical transition process and the mid-latitude jet system stimulates the downstream development. In this paper, three typhoon cases were selected to study their downstream development mechanism through the analysis of the eddy kinetic energy budget and the idealized simulations. The results of Chen’s work to the Pacific region were examined. The results were consistent with the results of Chen’s Atlantic hurricane Case. ET downstream at the upper levels generated first eddies, and the disturbances triggered the low level eddy development. Then the upper and the lower coupled and formed a deep cyclone system throughout the whole troposphere. The ageostrophic geopotential flux promoted the formation and development of the downstream ridge from the typhoon. Vertical ageostrophic geopotential flux transferred energy from upper downward that convergence happened in lower, which stimulated the lower-level cyclone development. Simulation results showed that, in the process of ET, TC outflow transported low potential vorticity to mid-latitude jet, which enhanced the PV gradient and the baroclinic. Then, it is inspired the Rossby wave in the jet and propagated downstream. The formation of downstream ridge-trough couple and development of the further wave was the spread to the downstream through the Rossby wave.
Hua Chen , Ye Huo . Case Comparing Study of Downstream Circulation Development during Typhoon Extratropical Transition[J]. Advances in Earth Science, 2016 , 31(4) : 409 -421 . DOI: 10.11867/j.issn.1001-8166.2016.04.0409.
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