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Vol.11, NO.4, 2000

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Article Navigation > Journal of Applied Meteorological Science > 2000 > 11(4): 392-399

Wang Wen, Chang Linsheng. Numerical study of transversal wave instability for the '96.1' snowstorm event. J Appl Meteor Sci, 2000, 11(4): 392-399.

Citation:

Wang Wen, Chang Linsheng. Numerical study of transversal wave instability for the "96.1" snowstorm event. J Appl Meteor Sci, 2000, 11(4): 392-399.

Wang Wen, Chang Linsheng. Numerical study of transversal wave instability for the '96.1' snowstorm event. J Appl Meteor Sci, 2000, 11(4): 392-399.

Citation:

Wang Wen, Chang Linsheng. Numerical study of transversal wave instability for the "96.1" snowstorm event. J Appl Meteor Sci, 2000, 11(4): 392-399.

NUMERICAL STUDY OF TRANSVERSAL WAVE INSTABILITY FOR THE "96.1" SNOWSTORM EVENT

Department of Atmospheric Sciences, Lanzhou University, Lanzhou 730000

Received Date: 1999-09-13
Rev Recd Date: 1999-11-23
Publish Date: 2000-11-30

Abstract

Using the output data of an MM4 mesoscale numerical model which fairly well simulated the developing structure and the evolution of the "96.1" snow storm event over the Qinghai-Xizang Plateau, a nonlinear transversal wave instability model and simulation system is developed to validate the formation mechanism of the snow storm process. The results show that the fields of vertical velocity are coincident with not only with those of the stream function, but also with the observations. It indicates that the transversal wave instability is substantially a formation mechanism for the occurrence of the "96.1" snow storm.
- Tibetan snow storm;
- Transversal wave instability;
- Numerical simulation

Figures and Tables

图 1 流函数的初始场 (单位: m²·s^-1)

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图 2 线性横波型不稳定理想试验J场 (a) 2h (b) 36 h (单位: m²·s^-1)

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图 3 线性横波型不稳定理想试验w′场 (a) 10^-2cm·s^-1; (b) cm·s^-1

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图 4 非线性横波型不稳定理想试验w场 (单位: m²·s^-1)

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图 5 1996年1月16日08:00～17日08:00 (a) 和16日08:00～18日08:00 (b) 暴雪降水量 (mm)

(双虚线分别是16日20:00 (a) 和17日08 (b) 500 hPa切变线)

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图 6 “96.1”暴雪过程MM4模拟500 hPa流场 (a) 16日20:00 (b) 17日08:00

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图 7 1月15日20:00为初值的横波不稳定模拟试验J场 (a) 6h (b) 12h

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图 8 1月15日20:00为初值的横波不稳定模拟试验垂直运动场 (a) 6h (b) 12h

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图 9 1月16日20:00为初值的横波不稳定模拟J场 (a) 6h (b) 12h

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References

[1]	邓远平, 程麟生, 张小玲.三相云显式降水方案和"96.1"暴雪成因的中尺度数值模拟.高原气象, (待发表).
[2]	王文, 程麟生."96.1"高原暴雪过程湿对称不稳定的数值研究.高原气象, 2000, 19 (2):219~240. http://www.cnki.com.cn/Article/CJFDTOTAL-GYQX200002000.htm
[3]	王文, 程麟生."96.1"高原暴雪过程湿对称不稳定的诊断分析.兰州大学学报.(待发表).
[4]	张可苏.斜压气流的中尺度稳定性Ⅱ.横波型不稳定.气象学报, 1988, 46:385~392. http://www.cnki.com.cn/Article/CJFDTOTAL-QXXB198804000.htm
[5]	张可苏.大气动力学模式的比较研究.中国科学, 1980, 3:277~287. http://www.cnki.com.cn/Article/CJFDTOTAL-JAXK198003006.htm

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