Nonlocality of Tropical Cyclone Activity in Idealized Climate Simulations

• DOI: 10.1002/2017ms001084
• Publication Date: 2017-12-13T14:52:58Z
• Authors: T. Frisius; S. M. A. Abdullah
• Keywords: Tropical cyclogenesis; Cyclogenesis; Anomaly (physics)

Abstract The response of tropical cyclone activity in the predicted warmer future climate is still a topic scientific research. However, by nonlocality hypothesis, depends rather on relative than absolute sea surface temperature (SST). This hypothesis investigated through idealized experiments performed with global atmospheric model PlaSim. includes prescribed SST and adopts spectral resolution T170 for resolving cyclones. An land‐sea configuration two oceans continents has been used to study mechanism. sensitivity WARMBASIN COLDBASIN include positive negative anomaly 2.5 K northeastern basin. control run similar all four ocean basins while experiment simulates striking local increase they nearly vanish other three basins. weaker opposite way reduction nonlocal increase. Analysis well‐known cyclogenesis indices shows that could be explained vorticity, humidity, upper tropospheric changes only vorticity agreement COLDBASIN. anomalies determine presence or absence steady state large‐scale low at location where cyclones favorably form. modified an SST‐induced change Walker‐like planetary circulation.