[9月15日] 波特兰州立大学David Jay教授学术报告

Secular Changes in Pacific Tides

报告人：Prof.David A. Jay, Department of Civil and Environmental Engineering, Portland State University, USA (2007- )

Ph.D. in Physical Oceanography, Department of Oceanography, University of Washington （1987）

时间：9月15日（星期四）上午8:30-9:30

地点：曾呈奎楼A-205

Abstract

Global sea level rise is well documented. However, changes in high waters, including the tidal contribution, are sometimes more relevant than GSL rise. Analyses show thatK₁and M₂amplitudes (|K₁| and |M₂|) are increasing throughout the Eastern Pacific, except for |M₂| in the Gulf of Panama. North of 18ºN, |K₁| and |M₂| are both growing at 2.2% century^-1. The mean increase in total tidal amplitude (0.59mmyr^-1) is less than the present GSL rise (1.7mmyr^-1). However, mean sea level is nearly constant in the NE Pacific, so tidal evolution plays a major regional role in changes in high water levels. The spatial pattern of tidal evolution suggests the influence of large-scale processes, and the similarity in spatial patterns for |K₁| and |M₂| excludes mechanisms with strong frequency dependence. Increasing tidal amplitudes may impact ocean mixing, nutrient supply, primary production, fisheries, and coastal erosion.

Extension of this analysis to the entire Pacific Ocean is underway, with an expanded constituent set. A major part of our effort has been directed toward expanding the available data set by recovery of historic data, investigating the causes of decadal-scale fluctuations in tidal properties, and evaluating the role of harbor development in tidal evolution. Preliminary results for these efforts will be presented.

邀请人：胡建宇hujy@xmu.edu.cn

联系人：刘辉huiliu@xmu.edu.cn

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