冷涡对过境台风的响应研究

利用多源卫星遥感资料及再分析资料,对台风泰利(Talim)对中尺度冷涡的影响进行了分析研究。结果表明,台风泰利过境中尺度冷涡时,冷涡显著增强。最大海面高度异常出现在冷涡中心区域,达到-32.7cm,最大海表温度降幅达到3℃以上,叶绿素平均浓度增长了10倍。通过计算冷涡海域的罗斯贝数、水体拉伸度和离散度等动力学参数,可以进一步发现,台风过境冷涡所在海域时,局地非地转效应和混合效应显著增强,罗斯贝数、水体拉伸和离散度均增加了2倍以上,最大水体拉伸度和离散度发生在冷涡南侧靠近台风路径的区域。本研究对深入理解涡-台风相互作用,以及由此产生的海洋生态环境效应具有重要的意义和作用。

RESPONSES OF COLD-CORE EDDY TO THE PASSAGE OF TYPHOON

Using multi-source satellite remote-sensing data and reanalysis data,we systematically investigated a mesoscale cold-core eddy response to Super Typhoon Talim in the Western North Pacific Ocean.Results indicate that the cold eddy was intensified during the passage of Typhoon Talim,and accompanied with maximum sea level anomaly(SLA)reduction of 32.7cm.Moreover,we observed the largest sea surface temperature(SST)drop by more than 3℃.By calculating the dynamic parameters of the cold vortex area,we discovered that both the local non-geostrophic effect and the mixing effect were significantly enhanced.In addition,the Rossby number,strain,and the instantaneous rate of separation(IROS)parameter increased by more than two times.The maximum strain and IROS parameter appeared in the area near the typhoon path in the southern side of the cold-core eddy.This study shall be significant for in-depth understanding of eddy-typhoon interaction and oceanic ecological environment effects.