| 摘要: |
| 本文研究和估计了1950～2010年不同太平洋年代际涛动(Pacific decadal oscillation, PDO)事件对北太平洋地区的海平面上升趋势所造成的影响。研究使用了SODA(Simple Ocean Data Assimilation)的海表面高度(sea surface height, SSH)数据资料, 通过多元线性回归方法, 分离了由PDO事件所引起的海表面高度变化(PDO-SSH), 以此分析PDO事件对海平面变化所造成的影响。结果表明, PDO-SSH所引起的海表面变化趋势的空间分布, 及其对区域海平面变化的遮掩效果, 和对应时期内PDO信号的振幅和周期有着紧密的关系。进一步的分析表明, PDO事件对北太平洋地区SSH变化所造成的影响是不均匀的, 在东西太平洋有着相反的变化趋势。1960～1989年, 具有较长数据时间长度的PDO信号对海平面变化的影响, 要强于高度计投入使用后的时期的表现, 而受其影响最重的海域出现在赤道西太平洋海域、阿留申群岛及北美沿岸地区, PDO-SSH在上述地区SSH的占比甚至高达60%。 |
| 关键词: 太平洋年代际涛动 区域海平面变化 海面高度 北太平洋 |
| DOI：10.11759/hykx20160322003 |
| 分类号: |
| 基金项目:国家自然科学基金项目(41376028); 国家重点基础研究发展973 计划(2012CB956000); 中国科学院百人计划(Y32109101L); 遥感科学国家重点实验室开放研究基金(OFSLRSS201504); 青岛市创业创新领军人才计划(13-CX-26); 国家自然科学基金-山东省-海洋科学研究中心联合资助项目(U1406401); 国家自然科学基金创新研究群体项目(41421005); 山东省自然科学基金(ZR2014DQ027) |
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| Quantification and evaluation of PDO influence on north Pacific SLR during 1950–2010 |
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LIU Chao,XU Yong-sheng
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| Abstract: |
| In this paper, the influence of different Pacific Decadal Oscillation (PDO) events are investigated and estimated during 1950–2010 in the North Pacific. Simple ocean data assimilation (SODA) sea surface height (SSH) data are used to separate PDO-induced SSH varieties (PDO-SSH) by applying the multiple linear regression method. Results show that the obtained PDO-SSH induced sea level rise and its obscure-effect are closely related to the amplitude and period of the corresponding PDO signal. Further analysis shows that the influence of PDO events in the North Pacific is not uniform, and an opposite sign is observed in the Eastern and Western Pacific. The long-term PDO signal during 1960 to 1989 has a stronger influence than the altimeter period, and the areas most influenced are the western equatorial Pacific, Aleutian Islands, and coast of North America, where PDO-SSH in these regions accounts for nearly 60% of observed SSH. |
| Key words: PDO (Pacific decadal oscillation) regional sea level SSH (sea surface height) North Pacific Ocean |
