摘要
利用17年5个月的卫星高度计资料,探讨格陵兰岛附近海域海平面的季节变化和年际变化特征,结果表明,该区域海平面变化存在显著的季节信号和年际信号。近20a来,格陵兰岛附近海域海平面的平均上升速率为1.7mm/a,小于全球海平面的平均上升速率。该海域的海平面变化存在很强的区域性,通常多年平均海面高度异常(SSHA)大的海区,海平面上升速率也大;多年平均SSHA低的海区,海平面上升速率则较小。EOF分析表明第一模态为季节模态,整个海域第一空间模态的位相相同,说明该海域海平面的季节变化趋势是相同的。该区域的SSHA与海冰面积指数呈负相关,海平面的季节变化受海冰面积大小的影响显著。SSHA与经向风应力距平的低频分量具有很好的正相关性,与纬向风应力距平的低频分量具有不显著的负相关,说明该海域海平面的年际变化受风应力的影响显著。
On the basis of the 17 years and 5 months altimeter data, the interannual variation of sea level change in the seas near the Greenland are investigated. The results show that there are obvious seasonal and interannual variability of the sea level in this area. The rising rate in this area is 1.7mm/a, which is less than the average rate of global ocean. At different areas the variation is different, which means there is a larger rising velocity when the average of sea surface height anomaly is higher, and vice versa. The first EOF mode of sea surface height is seasonal mode. The whole area has the same phase, which sug- gests that the seasonal variations of the whole area are the same. Sea surface height anomaly and sea-ice area are negative correlation. The seasonal variation of the sea level in the seas near the Greenland is sig- nificantly affected by the sea-ice area. Correlative analysis shows that the low frequency components of SSHA have good positive correlation to meridional wind stress. It indicates that there is close relationship between the interannual variation of the sea level and the low frequency of wind stress.
出处
《中国海洋大学学报（自然科学版）》
CAS
CSCD
北大核心
2011年第10期10-16,共7页
Periodical of Ocean University of China
基金
国家自然科学基金项目(40806072)
国家科技支撑计划项目(2007BAC03A0606)资助
关键词
格陵兰岛附近海域
海面高度异常
年际变化
海冰面积
风应力
the seas near the Greenland
sea surface height anomaly
interannual variation
sea-ice arealwind stress
