The response of tropical cyclones (TCs) and their rainfall to increases in sea surface temperature (SST) is explored with the Community Atmosphere Model, version 5, in an idealized aquaplanet set-up with globally-uniform SSTs.
- Anthropogenic climate change is increasing SSTs, and understanding how TC rainfall responds to SST increases is important to predict future changes in TC rainfall and associated hazards
- This work develops a methodology to break down TC precipitation increases into thermodynamic and dynamic components, which can be applied to more realistic model simulations and observations
- Idealized aquaplanet simulations are run with globally-uniform SSTs ranging from 295-305 K
- As SST warms, the TC counts decrease while the average intensity and outer size of the storms increase
- TC precipitation rates increase with SST, and for extreme precipitation, about 67% came from increases in atmospheric moisture while about 20% came from an increase in TC intensity