摘要
采用一种海面高度异常(Sea Level Anomaly,SLA)对热带气旋响应的合成分析方法,即根据热带气旋的路径位置和运动方向对海面高度异常进行插值、旋转和平均,得到不同热带气旋强度下,以热带气旋最佳路径点为原点的海面高度异常场。利用该方法,基于Aviso卫星高度计数据和中国气象局热带气旋最佳路径数据,得到了1993-2018年期间西北太平洋海面高度异常对热带气旋响应的特征。结果表明:热带气旋过境对海面高度有显著的影响,在热带气旋到达时刻的7 d之前,海面高度已经开始下降,海面高度异常变化较小;热带气旋经过时,路径中心海面高度明显降低,其右侧海面高度升高;在热带气旋经过6~7 d之后,海面高度降到最低值,随后缓慢升高。热带气旋经过海面时,其风速和移动速度对海面高度变化均有不同程度影响。随着风速增大,海面高度降低值也会增大。风速大于51.0 m/s时海面高度最大降幅达10.93 cm。热带气旋移动速度越慢,对海面高度影响越大。移动速度小于5 km/h时,海面高度最大降幅为19.79 cm。
A composing analytical method,which includes interpolation of sea level anomaly(SLA)field centered at the best track of tropical cyclones(TCs)and rotation of SLA field according to the propagation directions of TCs,was used to analyze the response of SLA to TCs.Responses of SLA to TCs in Northwest Pacific Ocean from 1993 to 2018 were analyzed with the composing analytical method based on Aviso altimetry dataset and CMA’s tropical cyclone database.The results show that the TCs have significant impact on the distribution and evolution of SLA.The SLA started to turn to negative 7 days before TCs’arrival.When TCs arrive,the sea level at the center of TCs decreased significantly,and the sea level on the right side of tropical cyclone tracks increased.The sea level decreased to its lowest value in 6—7 days after TCs’arrival,then rise slowly after that.Both the TC strength and translation speed can affect the spatial and temporal variation of sea level.Stronger TCs can result in lower sea levels.The maximum decrease of sea level can reach 10.93 cm for super Typhoon(wind speed greater than 51.0 m/s).Analysis also showed that,the slower the TCs move,the greater the impacts the TCs have on sea level.The maximum decrease in sea level is 19.79 cm when the translation speed of TCs is less than 5 km/h.
作者
王雪
蒋暑民
戴德君
马洪余
WANG Xue;JIANG Shu-min;DAI De-jun;MA Hong-yu(First Institute of Oceanography,MNR,Qingdao 266061,China;Laboratory for Regional Oceanography and Numerical Modeling,Pilot National Laboratory for Marine Science and Technology(Qingdao),Qingdao 266237,China;Key Laboratory of Marine Science and Numerical Modeling,MNR,Qingdao 266061,China)
出处
《海洋科学进展》
CAS
CSCD
北大核心
2022年第1期1-12,共12页
Advances in Marine Science
基金
国家重点研发计划项目——“两洋一海”区域超高分辨率多圈层耦合短期数值预报系统研制(2017YFC1404000)
国家自然科学基金项目——基于海上观测平台的海洋飞沫通量观测研究(42076014)
山东省支持青岛海洋科学与技术试点国家实验室重大科技专项课题——“两洋一海”海洋环境业务化预报及示范应用(2018SDKJ0106-2)。
关键词
西北太平洋
海面高度异常
热带气旋
Northwest Pacific Ocean
sea level anomaly
tropical cyclone
