SUPERCELL
Splitting Supercell
-
As a result of simulating the external supercell case with WRF, the cell was separated and moved after a certain period of time. The purpose of this study is to analyze the strength and precipitation of each cell when and after separation of supercells.
Point1. Timing and Intensity of Splitted Supercell
01
W (XY Plane)
The upper graph shows W at a specific altitude continuously over time as an xy plot, and the lower graph shows W averaged over time as an xy plot.
The above graph shows that the supercell separates into two cells and moves. In the case of 5km, where the initial radius is the smallest, the updraft of cells that separate and move to the left gradually weakens over time. On the other hand, in cases where the initial radius is large, it can be seen that the strength of updraft is maintained even if the separated cell moves.
02
W (YZ Plane)
This is a YZ plane graph of W according to the initial radius setting value. It shows the WRF modeling results between 10 and n minutes.
When supercells are observed over time in the YZ plane, the cells actually separate and move based on the center. Through the graph above, you can check the cell splitting time according to the initial radius. It can be seen that the larger the initial radius, the faster the storm grows and the faster the separation time.
03
Vorticity of Splitted Supercell
The above graphs are xy plots showing the vertical mean of the vorticity according to the initial radius at 30min, 60min, and 90min timesteps, respectively.
Anticyclone(-) and cyclone(+) can be presented through vorticity at each time step. At the beginning of supercell creation (30 min), only one cyclone-anticyclone pair exists, but as time passes, it separates into two pairs and moves. Additionally, in the early stages of formation, the cyclone is superior to the anticyclone, but as the supercell separates into two and moves, the strength of the anticyclone becomes more dominant.
Point 2. Cloud and Rain of Splitted Supercell
01
QCLOUD & QRAIN (YZ Plane)
The above graph is the YZ plane graph of QCLOUD and QRAIN according to the initial radius setting value. This is the modeling result between 10 and n minutes.
It can be seen that the cell is separated into two and moves through the vertical distribution of the cloud mixing ratio and liquid water mixing ratio. In addition, even after the cells are separated, the QCLOUD and QRAIN of each cell are different as they move, and the larger the initial radius, the higher the liquid water content is even after splitting.
Conclusion