气候变化领域集成服务门户(CCPortal): Assessment of Tidal Range Changes in the North Sea From 1958 to 2014

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DOI	10.1029/2020JC016456
	Assessment of Tidal Range Changes in the North Sea From 1958 to 2014
	Jänicke L.; Ebener A.; Dangendorf S.; Arns A.; Schindelegger M.; Niehüser S.; Haigh I.D.; Woodworth P.; Jensen J.
发表日期	2021
ISSN	21699275
卷号	126 期号:1
英文摘要	We document an exceptional large-spatial scale case of changes in tidal range in the North Sea, featuring pronounced trends between −2.3 mm/yr at tide gauges in the United Kingdom and up to 7 mm/yr in the German Bight between 1958 and 2014. These changes are spatially heterogeneous and driven by a superposition of local and large-scale processes within the basin. We use principal component analysis to separate large-scale signals appearing coherently over multiple stations from rather localized changes. We identify two leading principal components (PCs) that explain about 69% of tidal range changes in the entire North Sea including the divergent trend pattern along United Kingdom and German coastlines that reflects movement of the region’s semidiurnal amphidromic areas. By applying numerical and statistical analyses, we can assign a baroclinic (PC1) and a barotropic large-scale signal (PC2), explaining a large part of the overall variance. A comparison between PC2 and tide gauge records along the European Atlantic coast, Iceland, and Canada shows significant correlations on time scales of less than 2 years, which points to an external and basin-wide forcing mechanism. By contrast, PC1 dominates in the southern North Sea and originates, at least in part, from stratification changes in nearby shallow waters. In particular, from an analysis of observed density profiles, we suggest that an increased strength and duration of the summer pycnocline has stabilized the water column against turbulent dissipation and allowed for higher tidal elevations at the coast. © 2020. The Authors.
英文关键词	amphidromes; empirical orthogonal function (EOF); Kriging; North Sea; stratification; tidal range
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186507
作者单位	Research Institute for Water and Environment, University of Siegen, Siegen, Germany; Centre for Coastal Physical Oceanography, Old Dominion University, Norfolk, United States; Faculty of Agricultural and Environmental Sciences, University of Rostock, Rostock, Germany; Institute of Geodesy and Geoinformation (IGG), University of Bonn, Bonn, Germany; School of Ocean and Earth Science, University of Southampton, Southampton, United Kingdom; National Oceanography Centre, Liverpool, United Kingdom
推荐引用方式 GB/T 7714	Jänicke L.,Ebener A.,Dangendorf S.,et al. Assessment of Tidal Range Changes in the North Sea From 1958 to 2014[J],2021,126(1).
APA	Jänicke L..,Ebener A..,Dangendorf S..,Arns A..,Schindelegger M..,...&Jensen J..(2021).Assessment of Tidal Range Changes in the North Sea From 1958 to 2014.Journal of Geophysical Research: Oceans,126(1).
MLA	Jänicke L.,et al."Assessment of Tidal Range Changes in the North Sea From 1958 to 2014".Journal of Geophysical Research: Oceans 126.1(2021).