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A Simulation Study of the Influence of Marine Characteristics on the Track and Intensity of Jiang-Huai Cyclones in April

Author: XuYingChun
Tutor: ZhuWeiJunï¼›WeiJianSu
School: Nanjing University of Information Engineering
Course: The climate system and global change
Keywords: Oceanic features Jianghuai cyclone Numerical Simulation
CLC: P458.121.1
Type: Master's thesis
Year: 2011
Downloads: 25
Quote: 0
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Abstract


In this paper, the WRF model and NCEP / NCAR global reanalysis data, select the appropriate parameters of live simulation program on April Jianghuai cyclone three representative examples. The simulation results reflect the trend of live Jianghuai cyclone moving trends and cyclone intensity, which also verify that the selected parameterization scheme has high credibility and Jianghuai cyclone of April has a strong ability to simulate. Oceanic features, respectively, on the basis of design for the space type of ocean properties and SST sensitivity test. Combination of the active area of ??the oceanic features April Jianghuai cyclone track and intensity Jianghuai cyclone into the sea. The marine ocean marine property into land property in the context of film contamination Jianghuai cyclone sensitive tests reflect from the actual ocean features, Marine property converted into three aspects of land properties and analog Regional Seas convert land property attributes explore ocean properties Jianghuai cyclone. The results showed that the conversion of ocean properties cyclone tracks southward cyclone intensity. SST sensitive test to reflect the impact of the spatial distribution of the temperature characteristics of the near Sea Jianghuai cyclone. April, nearly 60 years (1950 - 2009), after the commencement of the near sea-surface temperature data via EOF modal space distribution characteristics consistent distribution of sea surface temperature, and The second modal space distribution characteristics for the north and south of the sea surface temperature inversion type distribution. Near Sea temperature is mainly characterized by the spatial distribution pattern: consensus the colder-type, consistent warm type, North South warm cold type Southern cold north and warm type. Of climatological SST field as a reference to the object, when the the the cyclone moving path northerly near Sea temperature was consistent warm-type and South warm North cold distribution, cyclone intensity on the strong side, and the consistent warmer than the South warm North cold offshore SST spatial distribution of on the JAC cyclone impact is too large; the cyclone moving path southerly near Sea temperature was consistent the colder type with Southern cold north and warm type distribution, weak cyclone intensity and consistent colder the more southern cold North Warm Proximity Sea temperature spatial distribution the on the JAC cyclone impact is too large. In addition, by analyzing the vertical circulation field, water vapor flux, water vapor flux divergence, convective available potential energy and latent heat explore Jianghuai cyclone causes of the differences in the susceptibility testing of marine and sea temperature sensitive. By southerly airflow to the the vertical circulations field (800 hPa-600 hPa) is conducive to the development of Jianghuai cyclone, and increased cyclone moving northward component; low-level northerly flow inhibition Jianghuai cyclone's development, and increased cyclone southward moving component. When the cyclone is located in the vicinity of the Dabie Mountains, Jianghuai cyclone front of the moisture convergence zone in the direction of vapor flux mainly southwest direction, the main southeast direction into the sea; moisture convergence zone of the front side of the center of the cyclone is a cyclone a necessary condition for development. Low-level convective available potential energy (1000 hPa-700 hPa) on the strong side and the front side in the center of the cyclone is more conducive to the development of Jianghuai cyclone; cyclone center and the east side of the strong latent heat energy to play a catalytic role in the development of the cyclone.

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CLC: > Astronomy,Earth Sciences > Atmospheric science (meteorology ) > Weather Forecast > Weather analysis of the process > Profile analysis > Individual analysis > Analysis of the precipitation process > Analysis of torrential rain
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