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Chinta, Sandeep
- Hybrid Assimilation on a Parameter-Calibrated Model to Improve the Prediction of Heavy Rainfall Events during the Indian Summer Monsoon
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Authors
Affiliations
1 Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai 600 036, IN
2 National Centre for Medium Range Weather Forecasting, A-50, Sector 62, Noida 201 309, IN
3 Divecha Centre for Climate Change, Indian Institute of Science, Bengaluru 560 012, IN
1 Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai 600 036, IN
2 National Centre for Medium Range Weather Forecasting, A-50, Sector 62, Noida 201 309, IN
3 Divecha Centre for Climate Change, Indian Institute of Science, Bengaluru 560 012, IN
Source
Current Science, Vol 124, No 6 (2023), Pagination: 693-703Abstract
Heavy rainfall events during the Indian summer monsoon cause landslides and flash floods resulting in a significant loss of life and property every year. The exactness of the model physics representation and initial conditions is critical for accurately predicting these events using a numerical weather model. The values of parameters in the physics schemes influence the accuracy of model prediction; hence, these parameters are calibrated with respect to observation data. The present study examines the influence of hybrid data assimilation on a parameter-calibrated WRF model. Twelve events during the period 2018–2020 were simulated in this study. Hybrid assimilation on the WRF model significantly reduced the model prediction error of the variables: rainfall (18.04%), surface air temperature (7.91%), surface air pressure (5.90%) and wind speed at 10 m (27.65%) compared to simulations with default parameters without assimilation.Keywords
Heavy Rainfall Events, Hybrid Assimilation, Numerical Weather Model, Parameter Calibration, Summer Monsoon.Full Text
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