西北太平洋热带气旋极端事件对比分析
Comparative analysis of extreme events of tropical cyclones in the Northwest Pacific Ocean
王照华 1吴克俭 1赵栋梁1
作者信息
- 1. 中国海洋大学海洋与大气学院,山东青岛 266100
- 折叠
摘要
本文选取 2004年和 2017年西北太平洋生成的热带气旋开展研究,两个年份的热带气旋数量和登陆数量基本一致,但登陆地点分别集中在华东、华南两个不同位置,且气旋累积能量相差极大.对热带气旋的路径模式、登陆地点、强度及相关环境因素的研究发现,西北太平洋热带气旋活动受区域性海表面温度异常、厄尔尼诺-南方涛动以及青藏高原积雪异常的影响较强.热带气旋的生成数量在区域性海表面温度高的海域明显增多,其生成位置的变化又会使路径模式发生改变,最后改变登陆地点和频率.青藏高原积雪通过积雪面积大小来影响副热带高压的强度和位置,进而影响热带气旋的路径模式,最终改变登陆地点和频率.由于大陆的阻挡,生成位置远离(靠近)大陆的热带气旋的气旋累积能量偏高(低),同时偏好弧线型路径模式(寿命长)的热带气旋的气旋累积能量偏高,偏好直线型路径模式(寿命短)的热带气旋的气旋累积能量偏低.气旋累积能量与热带气旋的生成位置、路径模式的年际变化有一定的联系.
Abstract
Two tropical cyclone(TC)events generated in the Northwest Pacific(WNP)in 2004 and 2017 were selected to study their track patterns,landfall locations,intensities and related environmental factors.The number of TCs and the number of landfalls were basically the same in these two years,but the landfall locations(east and south China,respectively)and accumulated cyclone energy(ACE)were different.The results showed that the WNP TCs were strongly influenced by regional sea surface temperature(SST)anomalies,El Niño-Southern Oscillation(ENSO)and snow cover on Qinghai and Tibetan Plateau(QTPSC)anomalies.The number of TCs in the regional high SST areas increased,and the TC track patterns changed with their generation locations,which ultimately alter the landfall locations and frequencies.QTPSC affected the intensity and location of the subtropical high systems through the SC level,which in turn changed their track patterns,landfall locations and frequencies.Due to the blockage of the mainland of China,the ACE of TCs generated far(near)away from the mainland was on the high(low)side.Moreover,TCs with high ACE usually had curved track patterns and longer lifetimes,while TCs with low ACE had flat track patterns and shorter lifetimes.Additionally,ACE was associated with interannual variations of TC generation locations and track patterns.
关键词
热带气旋/路径模式/登陆地点/气旋累积能量Key words
tropical cyclone/track pattern/landfall location/accumulated cyclone energy引用本文复制引用
基金项目
国家自然科学基金项目(42176018)
国家自然科学基金项目(41876010)
崂山实验室科技创新项目(LSKJ202202401)
中国留学基金委(201806330006)
出版年
2024
NETL
NSTL
万方数据