21st Conference on Climate Variability and Change


Simulations of present-day tropical cyclone climatology and their temporal variability associated with ENSO with a 20-km-mesh high-resolution AGCM

Hiroyuki Murakami, AESTO/MRI, Tsukuba, Ibaraki, Japan; and J. Yoshimura and B. Wang

A 25-year, present-day climate simulation with the 20-km-mesh high resolution Japan Meteorological Agency (JMA) and Meteorological Research Institute (MRI) Atmospheric General Circulation Model (AGCM) was conducted using the observational global sea-surface temperature and sea-ice concentration as lower boundary conditions.

Simulated tropical cyclones(TCs) were evaluated using best-track data in terms of seasonal variability of genesis position, trends of interannual genesis frequency, and influences of the El NiNo-Southern Oscillation (ENSO) on TC activity over the North Western Pacific basin. The result indicate that the AGCM realistically simulates general features of genesis locations and their seasonal variability. The AGCM also shows strong TC activity in El Nino years, associated with a southeastward shift of genesis positions, a longer duration, and a strong maximum wind speed.

These results indicate that, given lower boundary conditions, the general features of variability of TC activity can be simulated with a high-resolution AGCM.

extended abstract  Extended Abstract (1.1M)

Poster Session 4, Tropical cyclones and monsoons - posters
Tuesday, 13 January 2009, 9:45 AM-11:00 AM, Hall 5

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