Premium
Effect of air‐sea coupling on the frequency distribution of intense tropical cyclones over the northwestern Pacific
Author(s) -
Ogata Tomomichi,
Mizuta Ryo,
Adachi Yukimasa,
Murakami Hiroyuki,
Ose Tomoaki
Publication year - 2015
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2015gl066774
Subject(s) - entrainment (biomusicology) , sea surface temperature , climatology , tropical cyclone , atmospheric sciences , environmental science , general circulation model , ocean general circulation model , mixed layer , oceanography , geology , climate change , physics , rhythm , acoustics
Abstract Effect of air‐sea coupling on the frequency distribution of intense tropical cyclones (TCs) over the northwestern Pacific (NWP) region is investigated using an atmosphere and ocean coupled general circulation model (AOGCM). Monthly varying flux adjustment enables AOGCM to simulate both subseasonal air‐sea interaction and realistic seasonal to interannual sea surface temperature (SST) variability. The maximum of intense TC distribution around 20–30°N in the AGCM shifts equatorward in the AOGCM due to the air‐sea coupling. Hence, AOGCM reduces northward intense TC distribution bias seen in AGCM. Over the NWP, AOGCM‐simulated SST variability is large around 20–30°N where the warm mixed layer becomes shallower rapidly. Active entrainment from subsurface water over this region causes stronger SST cooling, and hence, TC intensity decreases. These results suggest that air‐sea coupling characterized by subsurface oceanic condition causes more realistic distribution of intense TCs over the NWP.