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The evolution of hollow symmetric-PV tower during the landfall of typhoon Mujigae(2015)

Frontiers of Earth Science 2019年第4期13卷 817-828页

作者： Baofeng JIAO Lingkun RAN Xinyong SHEN Key Laboratory of Meteorological Disaster Ministry of EducationNanjing University of Information Science and TechnologyNanjing 210044China Joint International Research Laboratory of Climate and Environment Change Nanjing University of Information Science and TechnologyNanjing 210044China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science and TechnologyNanjing 210044China Institute of Atmospheric Physics Chinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100029China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519082China

The evolution of typhoon Mujigae(2015)during the landfall period is determined using potential vorticity(PV)based on a high-resolution numerical *** heating from deep moist convections in the eyewall produces a hollow PV tower extending from the lower troposphere to the middle *** the potential temperature and wind fields could be highly asymmetric during landfall,the fields are divided into symmetric and asymmetric ***,PV is split into three parts:symmetric PV,first-order asymmetric PV,and quadratic-order asymmetric *** calculating the azimuth mean,the first-order term *** symmetric PV is at least one order of magnitude larger than the azimuthal mean quadratic-order term,nearly accounting for the mean ***,the symmetric PV tendency equation is derived in cylindrical *** budget terms include the symmetric heating term,flux divergence of symmetric PV advection due to symmetric flow,flux divergence of partial first-order PV advection due to asymmetric flow,and the conversion term between the symmetric PV and quadratic-order asymmetric *** diagnostic results indicate that the symmetric heating term is responsible for the hollow PV tower generation and *** symmetric flux divergence largely offsets the symmetric heating contribution,resulting in a horizontal narrow ring and vertical extension *** conversion term contribution is comparable to the mean term contributions,while the contribution of the partial first-order PV asymmetric flux divergence is apparently *** conversion term implicitly contains the combined effects of processes that result in asymmetric *** term tends to counteract the contribution of symmetric terms before landfall and favor horizontal PV mixing after landfall.

关键词： landfall typhoon potential vorticity hollow PV tower asymmetric features

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Numerical Study on Impact of the Boundary Layer Fluxes over Wetland on Sustention and Rainfall of landfalling Tropical Cyclones

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Acta meteorologica Sinica 2007年第1期21卷 34-46页

作者：李英陈联寿 State Key Laboratory of Severe Weather Chinese Academy of Meteorological Sciences

Numerical studies have been carried out to investigate the sustention and intensification of typhoon Nina （7503）, and the impacts of saturated wetland on the sustention and rainfall of tropical cyclone （TC） over land through sensitivity experiments, using the PSU/NCAR non-hydrostatic mesoscale model MM5v3 and its TC bogus scheme. The results show that the vertical transfer of fluxes in the boundary layer over saturated wetland has significant influence on the intensity, structure, and rainfall of a landfalling TC. The latent heating flux and the sensible heating flux are both favourable for TC sustaining and intensification on which the latent heating transfer is more favourable than the sensible heating transfer. They are also favourable for the maintenance of the spiral structure, and have an evident effect on the distribution of TC rainfall. The momentum flux weakens the TC vortex wind fields significantly, and is the dominant factor to dissipate and fill in a low pressure system, while it increases the local precipitation induced by a typhoon.

关键词： wetland boundary layer fluxes landfall typhoon numerical experiments

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COMPARATIVE ANALYSIS OF THE INTENSITY AND DISTRIBUTION OF HEAVY RAINS IN ZHEJIANG PROVINCE CAUSED BY typhoonS HAITANG AND MATSA

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Journal of Tropical Meteorology 2007年第2期13卷 141-144页

作者：张建海诸晓明王丽华 Meteorological Bureau of Shaoxing city

Study was carried out on two landfall typhoons Haitang and Matsa, which affected Zhejiang province seriously in 2005. Firstly, the similarity and difference between the two typhoon-induced heavy rains were compared and it was pointed out that both of them brought strong large-scale precipitation and the maximum centers of rainfall were located on the north side of the landfall site. Making landfall on Fujian, Haitang was weaker than Matsa in intensity but surpassed it in rainfall. Then with focus on intensity, moving speed, structure of typhoon, circulation and terrain, the two typhoon-related heavy rains were compared and analyzed. Results show that the asymmetrical distribution of rainfall was closely related to the structure of typhoons themselves, moisture transportation and mesoscale terrain. In contrast to the south side, the north side was hotter and wetter and water vapor was also more abundant. The phenomenon of more rainfall induced by Haitang was in connection with the following reasons. Invading cold air led to rainfall increases, weakened dynamic field and slower movement both benefited precipitation. For the last part, the cold characteristic of air mass over Zhejiang was also a favorable factor for the rain.

关键词： landfall typhoon intensity of precipitation distribution of rainfall comparison and analysis

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