Simulation of Heavy Precipitation Associated with an Intense Western Disturbance over Western Himalayas
Tóm tắt
Northern India is comprised of complex Himalayan mountain ranges having different altitude and orientations. This highly variable terrain is responsible for complexity of the weather systems passing over the region. During winter season, large amount of precipitation is received in this region due to eastward moving low pressure synoptic weather systems called Western Disturbances (WDs). Such heavy precipitation over the region lead to landslides and trigger avalanches in snow bound regions. This causes heavy damage to properties and human lives and therefore poses a great natural hazard threat. In this study an attempt is made to simulate a heavy precipitation event associated with an intense WD using a state of the art mesoscale model. Some important model simulated fields are compared with verifying analysis. Precipitation and circulation features associated with the intense WD are well simulated by the model. Forecast errors indicate that the high resolution mesoscale model could simulate the weather associated with the WD with reasonable accuracy.
Tài liệu tham khảo
Anthes, R. A. and Warner, T. T.: 1978, Development of hydrodynamic models suitable for air pollution and other mesometeorological studies, Mon. Wea. Rev. 106, 1045–1078.
Azadi, M., Mohanty, U. C., Madan, O. P,. and Padmanabhamurtty, B.: 2001, Prediction of precipitation associated with a western disturbance using a high resolution regional model: role of parameterization of physical processes, Meteoro. Appli 7, 317–326.
Betts, A. K. and Miller, M. J.: 1986, A new convection adjustment scheme. Part II: Single column tests using GATE wave, BOBMEX, ALTEX and Arctic air mass data sets, Quart. J. Roy. Meteorol. Soc. 112, 693–709.
Dudhia, J., Gill, D., Guo, Y. R., Hansen, D., and Manning, K.: 1998, PSU/NCAR mesoscale modeling system tutorial class notes and user's guide: MM5 modeling system version 2. Available on the world wide web (URL:http://www.mmm.ucar.edu/mm5/doc.html).
Hong, S.-Y. and Pan, H.-L.: 1996, Nonlocal boundary layer vertical diffusion in a medium range forecast model, Mon. Wea. Rev. 124, 2322–2339.
Kalsi, S. R.: 1980, On some aspects of interaction between middle latitude westerlies and monsoon circulation, Mausam 38, 305–308.
Kalsi, S. R. and Haldar, S. R.: 1992, Satellite observations of interaction between tropics and mid latitude, Mausam 43, 59–64.
Mohanty, U. C., Madan, O. P., Rao, P. L. S., and Raju, P. V. S.: 1998, Meteorological fields associated with western disturbances in relation to glacier basins of western Himalayas during winterer season. Center for Atmospheric Sciences, Indian Institute of Technology, New Delhi, Technical report.
Pisharoty, S. and Desai, B. N.: 1956, Western disturbances and Indian weather, Indian J. Meteorol. Geophys. 7, 333–338.
Rao, Y. P. and Srinivasan, V.: 1969, Forecasting manual, Part II: Discussion of typical synoptic weather situation: Winter western disturbances and their associated feature, FMU report no III-1.1, issued by India meteorological Department, India.
Sashegyi, K. D. and Madala, R. V.: 1994, Initial conditions and boundary conditions, in R. A. Pielke and R. P. Pearce (eds.), Mesoscale Modeling of the Atmosphere, American Meteorological Society, pp 1–23.
Singh, M. S.: 1979, Westerly upper air troughs and development of western disturbances over India, Mausam 30(4), 405–414.