A Comparative Study on Performance of Analysis Nudging and 3DVAR in Simulation of a Heavy Rainfall Event Using WRF Modeling System
Open Access
- 23 August 2012
- journal article
- Published by Hindawi Limited in ISRN Meteorology
- Vol. 2012, 1-21
- https://doi.org/10.5402/2012/523942
Abstract
The present study focuses on the performance-based comparison of simulations carried out using nudging (NUD) technique and three-dimensional variational (3DVAR) data assimilation system (3DV) of a heavy rainfall event occurred during 25–28 June 2005 along the west coast of India. The Indian conventional and nonconventional observations are used in the 3DV experiment. Three numerical experiments are conducted using WRF modeling system, the model is integrated upto 54 hours from the initial time 0000 UTC of 25 June 2005. It is noticed that the meteorological parameters are improved in the resulting high-resolution analyses prepared by NUD and 3DV compared to without data assimilation experiment (i.e., called CNTL experiment). However, after the successful inclusion of observations using the 3DVAR data assimilation technique, the model is able to simulate better structure of the convective organization as well as prominent synoptic features associated with the mid-tropospheric cyclones (MTC) than the NUD experiment and well correlated with the observations. The simulated location and intensity of rainfall is also improved in 3DV simulation as compared with other experiments. Similar results are noticed in the root mean squar errors, correlation coefficients, and Equitable Threat Scores between TRMM and model simulated rainfall for all the three experiments.Keywords
This publication has 12 references indexed in Scilit:
- Impact of Doppler weather radar data on numerical forecast of Indian monsoon depressionsQuarterly Journal of the Royal Meteorological Society, 2010
- The role of land surface processes on the mesoscale simulation of the July 26, 2005 heavy rain event over Mumbai, IndiaGlobal and Planetary Change, 2009
- The effect of satellite and conventional meteorological data assimilation on the mesoscale modeling of monsoon depressions over IndiaArchiv für Meteorologie, Geophysik und Bioklimatologie Serie A, 2008
- Mesoscale simulation of an extreme rainfall event over Mumbai, India, using a high‐resolution MM5 modelMeteorlogical Applications, 2007
- The Impact of Different WRF Model Physical Parameterizations and Their Interactions on Warm Season MCS RainfallWeather and Forecasting, 2005
- A Three-Dimensional Variational Data Assimilation System for MM5: Implementation and Initial ResultsMonthly Weather Review, 2004
- Use of Four-Dimensional Data Assimilation in a Limited-Area Mesoscale Model. Part I: Experiments with Synoptic-Scale DataMonthly Weather Review, 1990
- The Minneapolis Flash Flood: Meteorological Analysis and Operational ResponseWeather and Forecasting, 1990
- A Case Study of Excessive Rainfall Centered Around Wellsville, New York, 20–21 June 1972Monthly Weather Review, 1978
- Mid-Tropospheric Cyclones of the Southwest MonsoonJournal of Applied Meteorology, 1970