太平洋海平面变化特征及影响因素分析

顾小丽; 李培良

太平洋海平面变化特征及影响因素分析

中国海洋大学, 物理海洋实验室, 山东, 青岛, 266100

基金项目: 教育部科学技术重点项目(108159);国家自然科学基金资助项目(40506006;40676013);国家重点基础研究发展计划资助项目(2007CB411807);国家高技术研究发展计划(“863”计划)资助项目(2007AA0912012)

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出版历程
- 收稿日期: 2008-08-18
- 修回日期: 2008-12-30

Pacific sea level variations and its factors

Physical Oceanography Laboratory, Ocean University of China, Qingdao 266100, China

摘要

摘要: 采用经验模态分解法对太平洋沿岸验潮站的月平均海平面资料进行处理,结合T/P高度计资料、Church(2004)重构SSH资料、Ishii(2005)月均海温资料,研究太平洋海平面年际、年代际变化以及资料长度内海平面变化趋势。太平洋沿岸海平面总体呈上升趋势,平均上升速率为1.4 mm/a,趋势项分布有明显的区域性和纬度特征。ENSO对太平洋地区海平面年际变化有显著影响,海平面年际变化与Nino3指数在西(东)太平洋为负(正)相关,海平面年际变化与Nino3指数的相关性在热带太平洋最大,并随着纬度升高相关性减弱,且不同地区年际变化有滞后ENSO时间不等的最大相关。海平面年际变化与PDO指数在西(东)太平洋为负(正)相关,海平面与PDO的相关性分布有区域性和随时间演变特征。年代际变化对目前使用卫星高度计资料分析海平面长期趋势项的预测有直接影响,可能完全掩盖海平面长期变化趋势。
- 海平面变化 /
- 年际变化 /
- 年代际震荡 /
- ENSO
Abstract: Decomposing monthly sea level data at tide g auges along the coast of the Pacific Ocean in the EMD method,and combining with other data,the Pacific Ocean sea level's interannual and decadal oscillation were in vestigatel,as well as information on the sea level trends. Overall,the Pacific Ocean coastal sea level rises,with an average rate in 1.4mm/a,and shows highly non-uniform properties in geography. There are obvious interannual and decadal variability at the Pacific sea level. The interannual variations of the Pacific Ocean sea level oscillations are significantly affected by the ENSO. In the east Pacific Ocean the interannual sea level variability and Nino3 index are positive correlation,while negative correlations in the west Pacific Ocean. The correlation between both is significant in the tropical Pacific Ocean,and the correlation is weakened with latitude increasing. At different areas this correlation coefficient is different. In the west(east)Pacific Ocean sea level decadal variation performs significant negative(positive)correlation with the PDO index overall. The correlation between them is non-uniform geographically and evolves with time. Sea level decadal changes could lead to exactly the opposite sea level trend,due to decadal variation directim pact on the trends.
- sea level variations /
- interannual variation /
- decadal oscillation /
- ENSO

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参考文献(25)

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