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Performance Evaluation of GPU-Based WRF Model in Simulating a Unique Tropical Cyclone of Arabian Sea: A Case Study of VSCS Vayu

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Title Performance Evaluation of GPU-Based WRF Model in Simulating a Unique Tropical Cyclone of Arabian Sea: A Case Study of VSCS Vayu
 
Creator Mukherjee, Pubali
Ramakrishnan, Balaji
 
Subject WRF
GFS
NCEP
SST
Nudging
Cyclone Vayu
GPP
 
Description 309-325
Tropical cyclone (TC) Vayu developed from a low-pressure system on 9 June 2019 near the West coast of India. It
underwent rapid intensification (RI) to a very severe cyclonic storm (VSCS) before weakening into a deep depression on 17
June 2019 with a unique track. The present study aims to evaluate the performance of the GPU-WRF model in simulating
the unique tropical cyclone Vayu when initialized with different meteorological boundary conditions and the effect of input
of time-varying SST data, the track, and the cyclone's intensity. The study also aims to investigate the cyclone's synoptic
parameters during its development and intensification. Four simulations are conducted with GFS and NCEP-FNL data with
and without SST input. The four-dimensional data assimilation analysis technique, the fdda analysis nudging scheme, was
used on the GFS data with SST input, which showed a significant improvement in track and intensity. The system skirting
the Gujrat coastline on 13 June is skillfully captured. Given the appreciable improvement of track and intensity with GFS
data using nudging, further investigation of the cyclone's synoptic parameters is done on the same. Overall, comparing the
simulated dynamics with the ERA-5 dataset indicated that the model simulated a stronger TC. WRF can skillfully simulate a
well-delineated eye wall at the matured stage (wind speed >40 m/s). An anomalously high mid-tropospheric relative
humidity (RH) (~90%) is indicated at the developing stage, indicating the onset of RI, during which the system showed RH
~100% at the mid-troposphere. On 14 June, when the system reached VSCS, the simulated storm's low-level relative
vorticity was ~359.93 × 10 –5 s-1, whereas ERA-5's was ~175.39 × 10 –5 s-1only.The simulated storm cyclone energy
(9.35×104 knts2) was lower than the observed (11.54 ×104 knts2). The significance of the results obtained from the study is
that the model can skillfully simulate the track and intensity of an Arabian Sea TC and capture TC Vayu's cyclogenesis. The
study also provides insight into the cyclone's synoptic parameters, such as mid-tropospheric relative humidity, low-level
relative vorticity, and cyclone energy, during its development and intensification. The study's findings can be useful in
improving the accuracy of tropical cyclone forecasting and enhancing our understanding of the physical processes involved
in their formation and intensification for the Arabian Sea region.
 
Date 2023-05-25T08:46:05Z
2023-05-25T08:46:05Z
2023-05
 
Type Article
 
Identifier 0975-0959 (Online); 0301-1208 (Print)
http://nopr.niscpr.res.in/handle/123456789/61946
https://doi.org/10.56042/ijpap.v61i5.71257
 
Language en
 
Publisher NIScPR-CSIR,India
 
Source IJPAP Vol.61(05) [May 2023]