Warm water pool influence on a tropical cyclogenesis in an aqua planet experiment
Abstract
In order to investigate tropical depressions (TDs), an aqua planet experiment was performed with the use of an AGCM at high resolution of T319L24 (about 40km grid interval around the equator). Among 8 types excess of sea surface temperatures (SSTs) proposed by Neale and Hoskins (2000), two of them with equatorial 3K warm anomalous SST produced tropical TDs. Observed isolated vortex-like patterns appeared in the distribution of precipitation around the tropics and the central surface pressure of some TDs deepened enough to be called a topical cyclone, i.e., below 980hPa against 1016hPa environment.
The experiment implies that the existence of the warm SST anomaly with a certain magnitude and pattern contribute to formation/development TDs. The experiment simplified conditions of an idealized APE is useful to explaining global climate/seasonal change and tropical cyclogenesis. We will talk the frequency of TD genesis, and relationship between genesis locations and SST patterns. The investigation using an aqua planet experiment of warm anomalous SST may have implication to understanding typhoons in the Western North Pacific in the real world.- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2005
- Bibcode:
- 2005AGUFM.A12C..04Y
- Keywords:
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- 0315 Biosphere/atmosphere interactions (0426;
- 1610);
- 0545 Modeling (4255);
- 1610 Atmosphere (0315;
- 0325);
- 3314 Convective processes;
- 4255 Numerical modeling (0545;
- 0560)