the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Evaluating intense precipitation in high-resolution numerical model over a tropical island: impact of model horizontal resolution
Abstract. A test of sensitivity to the model grid spacing for extreme rainfall simulation is carried out for the tropical island of La Réunion, which holds several world records of precipitation. An extreme rain event occurring during the moist season in 2011 is selected to study the numerical model behavior at four horizontal resolutions: 4 km, 2 km, 1 km and 500 m. The assessment based on raingauge network shows that the performance of daily rain simulation increases as reducing the model grid spacing from 4 km to 1 km. The spatial variability of 24 h rainfall is well captured by the simulation at 1 km and 500 m resolution. However, refining the resolution from 1 km to 500 m has little impact on the model performance compared to the 1 km run. Diagnosis analysis and numerical experiment reveal that only the 1 km and 500 m grid spacings are able to simulate a cold pool located near the coastal area of the island. This cold pool triggers the thermal lifting and creates convergence between the prevailing moist flow and offshore land breeze. The observed precipitation, air temperature and wind get good agreements with these simulated features. However, this cold pool is missed in the 4 km and 2 km simulations. Our study highlights the important role of air mixing with microphysical processes at 1 km scale in simulating such intense precipitations.
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RC C1275: 'Review paper: “Evaluating intense precipitation in high-resolution numerical model over a tropical island: impact of model horizontal resolution” by Yu et al.', Anonymous Referee #3, 02 Jul 2014
- AC C2133: 'Response to the Reviewer 3', Nan YU, 23 Sep 2014
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RC C1732: 'Referee Comment', Anonymous Referee #4, 29 Jul 2014
- AC C2139: 'Response to the Reviewer 4', Nan YU, 23 Sep 2014
- AC C2147: 'Reply to the Editor', Nan YU, 23 Sep 2014
- AC C2326: 'Revised version and modifications', Nan YU, 22 Oct 2014
-
RC C1275: 'Review paper: “Evaluating intense precipitation in high-resolution numerical model over a tropical island: impact of model horizontal resolution” by Yu et al.', Anonymous Referee #3, 02 Jul 2014
- AC C2133: 'Response to the Reviewer 3', Nan YU, 23 Sep 2014
-
RC C1732: 'Referee Comment', Anonymous Referee #4, 29 Jul 2014
- AC C2139: 'Response to the Reviewer 4', Nan YU, 23 Sep 2014
- AC C2147: 'Reply to the Editor', Nan YU, 23 Sep 2014
- AC C2326: 'Revised version and modifications', Nan YU, 22 Oct 2014
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Cited
5 citations as recorded by crossref.
- The orographic effect of Reunion Island on tropical cyclone track and intensity D. Barbary et al. 10.1002/asl.882
- Microscale anthropogenic pollution modelling in a small tropical island during weak trade winds: Lagrangian particle dispersion simulations using real nested LES meteorological fields R. Cécé et al. 10.1016/j.atmosenv.2016.05.028
- Evaluation of the Performance of the WRF Model in a Hyper-Arid Environment: A Sensitivity Study R. Abida et al. 10.3390/atmos13060985
- Response of the WRF model to different resolutions in the rainfall forecast over the complex Peruvian orography A. Moya-Álvarez et al. 10.1007/s00704-019-02782-3
- Regionalizing Rainfall at Very High Resolution over La Réunion Island Using a Regional Climate Model B. Morel et al. 10.1175/MWR-D-14-00009.1