| EXPERIMENTAL STUDY ON A DYNAMIC ASYMMETRICAL TYPHOON INITIALIZATION SCHEME BASED ON 4D-VAR |
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| 作者姓名： | 袁 炳 费建芳 王云峰 韩月琪 |
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| 作者单位： | Institute of Meteorology, PLA University of Science and Technology, Nanjing 211101 China |
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| 基金项目： | Natural Science Foundation of China，Specialized Projects of Public Welfare Industry(Meteorological Sector)(GYH，973 Program of National Key Foundamental Research and Development |
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| 摘 要： | 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.
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EXPERIMENTAL STUDY ON A DYNAMIC ASYMMETRICAL TYPHOON INITIALIZATION SCHEME BASED ON 4D-VAR |
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| YUAN Bing,FEI Jian-fang,WANG Yun-feng and HAN Yue-qi.EXPERIMENTAL STUDY ON A DYNAMIC ASYMMETRICAL TYPHOON INITIALIZATION SCHEME BASED ON 4D-VAR[J].Journal of Tropical Meteorology,2010,16(4):363-371. |
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| Authors: | YUAN Bing FEI Jian-fang WANG Yun-feng and HAN Yue-qi |
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| Institution: | Institute of Meteorology, PLA University of Science and Technology, Nanjing 211101 China |
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| Abstract: | 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 als... |
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| Keywords: | numerical weather prediction typhoon initialization scheme 4D-Var asymmetrical typhoon simulation of typhoon track and intensity |
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