| A NUMERICAL STUDY ON THE INFLUENCE OF WIND FIELDS AT UPPER LEVELS IN THE MEIYU PERIOD ON THE DEVELOPMENT OF LOW LEVEL JET AND MESOSCALE SYSTEMS |
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| 作者姓名： | 翟国庆 高坤 孙淑清 |
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| 作者单位： | Department of Geography Hangzhou University，Hangzhou 310028，Department of Geography，Hangzhou University，Hangzhou 310028，Institute of Atmospheric Physics，Chinese Academy of Sciences，Beijing 100080 |
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| 基金项目： | This work was supported by the National Natural Science Foundation of China under the auspices of Project Contract No.49335061. |
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| 摘 要： | Using a mesoscale model,a numerical study on a heavy rainfall case occurring in theChangjiang-Huaihe River Basin is made in this paper.The influence of the intensity ofnortheasterly wind in front of the Qinghai-Xizang high at upper level on the low level wind fieldand development of mesoscale systems as well as heavy rainfall is investigated.The model wellreproduced the heavy rainfall process and the weather systems associated.And it indicates that thestrong northeasterly flow around the high at upper troposphere will bring about not only thestrengthening of low level southeasterly wind,but also the appearance of shear-line and mesoscalevortex at low level.The coupling of northerly wind at upper level and southerly wind at lowerlevel constructs a vertical indirect circulation which is most favourable for the development ofconvective motions.Its ascending branch in the shear-line area is very strong and shows apronounced mesoscale characteristic.
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A NUMERICAL STUDY ON THE INFLUENCE OF WIND FIELDS AT UPPER LEVELS IN THE MEIYU PERIOD ON THE DEVELOPMENT OF LOW LEVEL JET AND MESOSCALE SYSTEMS |
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| Zhai Guoqing Gao Kun.A NUMERICAL STUDY ON THE INFLUENCE OF WIND FIELDS AT UPPER LEVELS IN THE MEIYU PERIOD ON THE DEVELOPMENT OF LOW LEVEL JET AND MESOSCALE SYSTEMS[J].Acta Meteorologica Sinica,1998(1). |
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| Authors: | Zhai Guoqing Gao Kun |
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| Institution: | Zhai Guoqing Gao Kun Department of Geography,Hangzhou University,Hangzhou 310028
Sun Shuqing Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100080 |
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| Abstract: | Using a mesoscale model,a numerical study on a heavy rainfall case occurring in the Changjiang-Huaihe River Basin is made in this paper.The influence of the intensity of northeasterly wind in front of the Qinghai-Xizang high at upper level on the low level wind field and development of mesoscale systems as well as heavy rainfall is investigated.The model well reproduced the heavy rainfall process and the weather systems associated.And it indicates that the strong northeasterly flow around the high at upper troposphere will bring about not only the strengthening of low level southeasterly wind,but also the appearance of shear-line and mesoscale vortex at low level.The coupling of northerly wind at upper level and southerly wind at lower level constructs a vertical indirect circulation which is most favourable for the development of convective motions.Its ascending branch in the shear-line area is very strong and shows a pronounced mesoscale characteristic. |
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| Keywords: | heavy rainfall on Meiyu front coupling of high and low level winds numerical experiments |
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