Typhoon Noguri(0801) caused a torrential rain event after landfall at East Hainan and West Guangdong. Based on the observational data, NCEP reanalysis data and the kinetic energy budget of divergent wind, the large-scale circulation and the transfer of kinetic energy were analyzed. The results show that: The heavy rain event is the result of the interaction between the Noguri remnant and its environmental systems. The strong low-level southeastern jet from the West Pacific together with the weakened southwestern jet linking with Typhoon Noguri after landfall keeps the strong transfer of moisture to the east of Guangdong, and the variation of kinetic energy of divergent wind indicates the details of the process. The convergence effect of kinetic energy flux which is induced by the variation of the intensity of low-level jets and the convergence fields, is the main source of kinetic energy of divergent wind over the heavy rain band. Furthermore, the updraft of warm air in southeaster jet and the downdraft of cold air in southeastern jet result in the transfer of baroclinic available potential energy to kinetic energy of divergent wind. Cold air plays an important role in the two processes. Besides, the variation of heavy rain between the East Guangdong and near the landing site is mostly due to the difference of the atmospheric stratification, even though the low level divergence is close within these two places.
CHENG Zhengquan
,
LIN Liangxun
,
LIU Yan
,
YANG Guojie
. Analysis on the Wind Kineticof Divergence Energy of Torrential Rain in East Guangdong Associated with Typhoon Noguri[J]. Plateau Meteorology, 2014
, 33(2)
: 557
-566
.
DOI: 10.7522/j.issn.1000-0534.2013.00019
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