西北太平洋不同区域海平面变化特征分析

The Analysis of Sea Level Variation in Northwest Pacific

重点研究西北太平洋长期验潮站海平面变化的季节、年际和年代际变化特征。所选站点多年平均变化速率为1.71mm/a。结果表明,近岸区、大洋沿岸区、大洋区主要周期均为12个月;近岸区、大洋沿岸区、大洋区部分低纬度站点存在6个月周期;所有站点都存在明显的年际和年代际周期信号;中高纬度地区年代际信号强于年际信号,热带地区年际信号强于年代际信号;近岸区、大洋沿岸区、大洋区站点年际和年代际变化具有明显的地域性;热带地区受ENSO影响强于中高纬度地区,热带大洋区受ENSO影响强于大洋沿岸区,热带大洋沿岸区受ENSO影响强于近岸区;受PDO影响较明显的站点位于25°N～40°N的中纬度地区。1993—2010年间,近岸区、大洋沿岸区、大洋区验潮站、大洋区T/P的主要周期均为12个月,但变化速率和季节变化振幅各不同,大洋区验潮站滞后其他区近1个月达到极值。

This study focuses on the similarities and differences of sea level variation in near-shore area,coastal area,and oceanic area in Northwest Pacific.The characteristics of seasonal,inter-annual and decadal changes are various.The trend is generally rising,and the mean rising rate is 1.71mm/year.As for the main period of SLA,Near-shore Area,Coastal Area,and Oceanic Area are all 12-month in the low lattitude area.The influence of ENSO is stronger in Tropical region than that in middle and High latitude region.For the propical region,the influence of ENSO is the strongest in the oceanic,then the coastal area,and the weakest is the near-shore area： The gauge station which locates at middle lattitude between 25°N and 40°N is obvions influeneed by PDO.From 1993 to 2010,the main period of near-shore area,coastal area,and oceanic area is 12-month,but the variety of rate and annual amplitude are different.Oceanic Area（gauge station）reaches the extremum about one month later than other areas.