首页|EXPERIMENTAL STUDY ON A DYNAMIC ASYMMETRICAL TYPHOON INITIALIZATION SCHEME BASED ON 4D-VAR

EXPERIMENTAL STUDY ON A DYNAMIC ASYMMETRICAL TYPHOON INITIALIZATION SCHEME BASED ON 4D-VAR

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Axisymmetric bogus vortexes at sea level are usually used in the traditional bogus data assimilation(BDA)scheme.In the traditional scheme,the vortex could not accurately describe the specific characteristics of a typhoon,and the evolving real typhoon is forced to unreasonably adapt to this changeless vortex.For this reason,an asymmetrical typhoon bogus method with information blended from the analysis and the observation is put forward in this paper,in which the impact of the Subtropical High is also taken into consideration.With the fifth-generation Penn State/NCAR Mesoscale Model(MM5)and its adjoint model,a four-dimensional variational data assimilation(4D-Var)technique is employed to build a dynamic asymmetrical BDA scheme to assimilate different asymmetrical bogus vortexes at different time.The track and intensity of six summer typhoons much influenced by the Subtropical High are simulated and the results are compared.It is shown that the improvement in track simulation in the new scheme is more significant than that in the traditional scheme.Moreover,the periods for which the track cannot be simulated well by the traditional scheme can be improved with the new scheme.The results also reveal that although the simulated typhoon intensity in the new scheme is generally weaker than that in the traditional scheme,this trend enables the new scheme to simulate,in the later period,closer-to-observation intensity than the traditional scheme.However,despite the fact that the observed intensity has been largely weakened,the simulated intensity at later periods of the BDA schemes is still very intensive,resulting in overly development of the typhoon during the simulation.The limitation to the simulation effect of the BDA scheme due to this condition needs to be further studied.

numerical weather predictiontyphoon initialization scheme4D-Varasymmetrical typhoonsimulation of typhoon track and intensity

YUAN Bing、FEI Jian-fang、WANG Yun-feng、HAN Yue-qi

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Institute of Meteorology, PLA University of Science and Technology, Nanjing 211101 China

国家自然科学基金国家自然科学基金国家自然科学基金Specialized Projects of Public Welfare Industry(Meteorological Sector)973 Program of National Key Foundamental Research and Development

108710994080504640830958GYHQX2007-6-152009CB421502

2010

10.3969/j.issn.1006-8775.2010.04.008

热带气象学报(英文版)
中国气象局广州热带海洋气象研究所

热带气象学报(英文版)

SCI
影响因子：0.169
ISSN：1006-8775
年,卷(期)：2010.16(4)
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