摘要
选择了12个个例,分析了冷涡区域海表面温度(sea surface temperature,SST)对热带气旋(tropical cyclone,TC)的响应。在TC的影响下,冷涡区域SST降低的最大值在2.7—9.15℃,冷涡平均降温1.35—5.89℃。冷涡SST降低与TC移动速度有很好的反向关联,移动速度越慢,冷涡SST降低越多。冷涡SST降低与TC平均最大风速有较好的正向关联,最大风速越大,冷涡SST降低越多。TC对冷涡的能量改变起着重要的作用,TC经过冷涡后,冷涡的动能(eddy kinetic energy,EKE)、有效重力位能(available gravitational potential energy,AGPE)有明显增长,并且EKE的增长小于AGPE的增长。TC作用前后EKE、AGPE的增长与冷涡区域SST降低的平均呈正向关联,表明在TC的影响下,冷涡的EKE、AGPE的改变能够反映SST降低的程度,或者说SST降低的多少能够反映冷涡EKE、AGPE改变的程度。
We chose 12 cases to analyze the responses of sea surface temperature （SST） in cord-core eddies to tropical cyclones （TCs）. The maximum SST reduction in the cold-core eddy regions ranged from 2.7 to 9.15℃, while the mean SST reduction of the cold-core eddy regions was 1.35-5.89℃. The inverse correlation between the SST reduction in the cold-core eddy region and the moving speed of TC was studied using these 12 cases： the slower the moving speed of TC was, the more reduction the SST in the cold-core eddy region had. And there was a positive correlation between the SST reduction in the cold-core eddy region and the mean maximum wind speed of the TC： the weaker the mean maximum wind speed was, the less the SST decreased. Under the influence of TC, the eddy kinetic energy （EKE） and available gravitational potential energy （AGPE） of core-core eddies obviously increased, and the AGPE increased more than the EKE. The change of EKE （AGPE） after the TC passed to that before the TC correlated well with the average SST cooling in the cold-core eddy region, which reflects that under the influence of TC, the increases of EKE and AGPE can be used as indicators for the SST cooling in the cold-core eddy region.
出处
《热带海洋学报》
CAS
CSCD
北大核心
2013年第2期47-54,共8页
Journal of Tropical Oceanography
基金
国家重点基础研究发展计划项目(2013CB430303)
中国科学院重要方向性项目(KZCX2-YW-226)
国家自然科学基金项目(U1033002
40906009)
关键词
热带气旋
冷涡
上层海洋响应
tropical cyclone
cold-core eddy
response of the upper ocean
