摘要
利用1993~2004年卫星高度计TP/Jason-1和ERS/ENVISAT提供的海平面异常(SLA)融合数据,分析了黑潮延伸区12年来的平均海平面异常的变化特征及中尺度涡的分布规律。研究表明,在黑潮延伸区海平面异常(SLA)呈递增趋势,年平均上升率为8.89mm/a,显著性周期是1年、0.5年和6年;黑潮延伸区的海平面异常和海表面温度异常的低频分量与Nino3指数具有较高的相关性。这说明,黑潮延伸区的海平面变化和海表面温度与厄尔尼诺事件密切相关,都受到黑潮变化的密切影响。在日本东部的黑潮延伸区,中尺度涡自东向西移动,寿命约为1年,移动速度大约是10经度/年。气旋涡和反气旋涡的面积呈现几乎同步增减的规律,均呈年周期变化,上半年少,下半年多。在1997~1998年,黑潮延伸区内中尺度涡的面积显著减小,并且正好对应于Nino3指数极大值出现的年份。因此,黑潮延伸区内中尺度涡的数量和强度也与厄尔尼诺事件密切相关。
The characteristics of sea level anomaly (SLA) and mesoscale eddies during 1993- 2004 year in the Kuroshio extension region are analyzed using altimetry data detected by TP/ Jason-1 and ERS/ENVISAT. It is found that the mean sea level anomaly of Kuroshio extension region in this period has a linear raise with a rate of 8.89mm/a, and has the most significant period with 1 year.0.5 year and 6 years. The correlation between the low-frequency components of SLA/SSTa in the Kuroshio extension region and Nino3 index is high, which indicates that SLA/SSTa in the Kuroshio extension region is closely related with the E1 Ni o event, and are both remarkably affected by the Kuroshio. In the ocean east of Japan, the mesoscale eddies moved from east to west with a life time of about 1 year, and a longitudinal speed in about 10 degrees/year. Clockwise eddies and anti-clockwise eddies nearly occupy even area, which fluctuates with a period of one year, reaches a minimum during the first half year and a maximum during the latter half year. In 1997-1998, the mesoscale eddies in the Kuroshio extension region decreased evidently; meanwhile the maximum appeared in the low-frequency components of Nino3 index. Therefore, The number and intensity of mesoscale eddies, in the Kuroshio extension region, are closely related with the E1 Nino phenomena.
出处
《海洋湖沼通报》
CSCD
北大核心
2007年第1期14-23,共10页
Transactions of Oceanology and Limnology
基金
国家高技术研究发展规划项目(2001AA6330802001AA633030)资助