Geoscience Reference
In-Depth Information
Table 1: Overview of the model used in the present study
Model
WRF 3.2.1
Horizontal resolution and time
Two nested domain 27 km, 9 km with 120 sec,
step and vertical levels
40 sec, 27 levels
Initial conditions
1200 UTC of 23rd May 2009
Time interval of data output
1 h
Cumulus scheme
1. Kain Fritsch 2 (KF) 2. Betts-Miller-Janjic
(BMJ)
3. Grell-Devenyi (GD) 4. New Grell (G3)
PBL scheme
1. YSU 2. Mellor-Yamada Janjic (MYJ)
3. Quasi-Normal Scale Elimination (QNSE)
4. MY Nakanishi and Niino closure 2.5
(MYNN2)
5. MYNN closure 3.0 (MYNN3)
Microphysics scheme
1. WSM3 (SM) 2. Ferrier (SM) 3. Lin (SM)
4. WSM6 (SM) 5. Goddard-GCE (DM)
6. WDM6 (DM) 7. Thomson (DM)
8. Morrison (DM)
Radiation
SW-Dudhia and LW-RRTM
3. Results and Discussions
The results obtained of the numerical experiments are presented and discussed
in this section in two stages.
Sensitivity to convection and PBL parameterization schemes
The results of numerical experiments conducted in the first stage are discussed
here, though results of nine experiments are presented in the figures because
of restriction on size of the manuscript. Figures 1(a) and (b) show the model
simulated track of tropical cyclone Aila with four convection schemes with
YSU PBL scheme (fixed) and five PBL schemes with G3 convection (fixed)
respectively along with the IMD best-fit track. The simulated tracks of the
cyclone closely followed the observed track throughout the simulation period
with the simulated tracks to the right of the IMD best-fit track. The track of the
storm is slightly better simulated by the model with BMJ-YSU (cumulus-PBL)
combination with average displacement error of 111 km during the whole period
of the model integration. The average displacement error in track prediction
during the whole period of model integration varies in the range of 8-22 km
with the use of various convection schemes and 9-21 km varies with use of
different PBL schemes. This indicates that the model simulated tracks are
equally sensitive to PBL and cumulus convection parameterization schemes.
The vector displacement, landfall time and landfall position errors in the model
simulations are also calculated.
 
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