Japan Geoscience Union Meeting 2016

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International Session (Oral)

Symbol A (Atmospheric and Hydrospheric Sciences) » A-CG Complex & General

[A-CG06] Multi-scale ocean-atmosphere interaction in the tropics

Tue. May 24, 2016 9:00 AM - 10:30 AM 202 (2F)

Convener:*Tomoki Tozuka(Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo), Tangdong Qu(University of Hawaii at Manoa), Takuya Hasegawa(Japan Agency for Marine-Earth Science and Technology), Motoki Nagura(Japan Agency for Marine-Earth Science and Technology), Hiroki Tokinaga(Disaster Prevention Research Institute/Hakubi Center, Kyoto Univesity), Ayako Seiki(Japan Agency for Marine-Earth Science and Technology), Masamichi Ohba(Central Research Institute of Electric Power Industry (CRIEPI), Environmental Science Research Laboratory), Chair:Tangdong Qu(University of Hawaii at Manoa), Takuya Hasegawa(Japan Agency for Marine-Earth Science and Technology)

10:00 AM - 10:15 AM

[ACG06-05] The role of tropical Atlantic SST anomalies in modulating western North Pacific tropical cyclone genesis

*Dachao Jin1,2, Liwei Huo2, Saji Hameed1, Pinwen Guo2 (1.University of Aizu, 2.Nanjing university of Information Science & Technology)

Keywords:Climate, tropical Atlantic SSTA, western North Pacific, tropical cyclone genesis

The connection between north tropical Atlantic (NTA) sea surface temperature (SST) anomalies and tropical cyclone (TC) genesis over the western North Pacific (WNP) and associated physical mechanisms are investigated in this study.We demonstrate a remarkable negative correlation ofWNP TC genesis frequency with the (preceding) boreal spring NTA SST anomalies. Our analysis suggests that major factors for TC genesis including distributions of large-scale vorticity and midtropospheric humidity are rendered unfavorable by remote teleconnections while barotropic energy conversion from the large-scale flow is suppressed. As shown in recent studies, the remote teleconnection from the Atlantic is sustained and enhanced throughout the typhoon season through local air-sea interactions. These results suggest that boreal spring NTA SST anomaly could be a new predictor for the seasonal WNP TC activity.