关键词: 热带气旋, 暖涡, 海?气相互作用, WRF-sbPOM

Abstract: The air-sea interaction between a tropical cyclone (TC) and an ocean warm core ring (WCR) is studied using a regional air-sea coupled model WRF-sbPOM (Weather Research and Forecasting-Stony Brook Parallel Ocean Model). A set of sensitivity experiments are carried out to examine the mutual response of the TC and the ocean without WCR and with a WCR placed on different locations alone the TC’s track. Model results reveal that the TC intensifies when it passes a WCR due to the fact that the sea surface temperature (SST) does not cool sharply because thick thermocline underneath the WCR suppresses the so-called negative feedback mechanism between the TC and the ocean. The degree of the TC intensification depends on the TC migration speed, TC strength, and the flow velocity of the WCR. The slow-moving TC intensifies sharply, while the fast-moving TC does not. Meanwhile, momentum is transferred from the TC to the ocean, interacting with WCR’s anticyclonic flow. The shape of the WCR evolves from circular to ellipse, with ocean heat content loss by 30% and kinetic energy loss by 60%.

Key words: tropical cyclone, warm core ring, air-sea interaction, WRF-sbPOM