气象2017，Vol.43Issue(4)：443-449,7.DOI:10.7519/j.issn.1000-0526.2017.04.006
黑潮延伸体区域海表温度锋的季节变化对北太平洋风暴轴的影响
Seasonal Variation of Kuroshio Extension SST Front and Its Influence on the Pacific Storm Track
摘要
Abstract
By using NOAA daily optimum interpolation sea surface temperature (SST) data and NCEP/ NCAR daily atmospheric reanalysis data,this paper analyzes the seasonal variation of Kuroshio Extension SST front and its influence on the Pacific storm track.The results show that the seasonal variation of the SST front position is weak,but its strength has significantly strong seasonal variation,and the strength of Pacific storm track has a coordinated change with the strength of SST front in Kuroshio Extension.The SST front is the strongest in winter,enhancing the baroclinicity of the atmosphere above it.The baroclinic energy conversions from mean available potential energy to eddy available potential energy and from eddy available potential energy to eddy kinetic energy are increased in the Kuroshio Extension region,where the baroclinic eddies are generated more frequently,absorbing energy from the background mean flow during the process of moving downward along with west wind,and,finally,strengthening the Pacific storm track and anchoring the central axis of the storm track above the Kuroshio Extension region.The SST front is very weak in summer,weakening the baroclinicity of the atmosphere above.The baroclinic energy conversions from mean available potential energy to eddy available potential energy and from eddy available potential energy to eddy kinetic energy are greatly reduced,and baroclinic eddies are generated less frequently,weakening the Pacific storm track,and making the strength center move to central Pacific,located northward.关键词
黑潮延伸体/海表温度锋/季节变化/北太平洋风暴轴Key words
Kuroshio Extension/SST front/seasonal variation/Pacific storm track分类
天文与地球科学引用本文复制引用
刘明洋,李崇银,谭言科,俞兆文..黑潮延伸体区域海表温度锋的季节变化对北太平洋风暴轴的影响[J].气象,2017,43(4):443-449,7.基金项目
国家重点基础研究发展计划(973计划)(2013CB956203)及国家自然科学基金项目(41490642和41475070)共同资助 （973计划）
