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Determining sea level change in the German Bight

机译:确定德国海岸线的海平面变化

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摘要

Regional mean sea level changes in the German Bight are considered. Index time series derived from 15 tide gauge records are analysed. Two different methods for constructing the index time series are used. The first method uses arithmetic means based on all available data for each time step. The second method uses empirical orthogonal functions. Both methods produce rather similar results for the time period 1924-2008. For this period, we estimate that regional mean sea level increased at rates between 1.64 and 1.74 mm/year with a 90% confidence range of 0.28 mm/year in each case. Before 1924, only data from a few tide gauges are available with the longest record in Cuxhaven ranging back till 1843. Data from these tide gauges, in particular from Cuxhaven, thus receive increasingly more weight when earlier years are considered. It is therefore analysed to what extent data from Cuxhaven are representative for the regional sea level changes in the German Bight. While this cannot be clarified before 1924, it is found that this is not the case from 1924 onwards when changes in Cuxhaven can be compared to that derived from a larger data set. Furthermore, decadal variability was found to be substantial with relatively high values towards the end of the analysis period. However, these values are not unusual when compared to earlier periods.
机译:考虑了德国湾的区域平均海平面变化。分析了从15条潮汐仪记录中得到的指数时间序列。使用两种不同的方法来构建索引时间序列。第一种方法基于每个时间步的所有可用数据使用算术平均值。第二种方法使用经验正交函数。两种方法在1924-2008年期间产生的结果都非常相似。在此期间,我们估计区域平均海平面以每年1.64到1.74毫米之间的速度增长,在每种情况下90%的置信区间为0.28毫米/年。在1924年之前,只有少数潮汐仪的数据可用,其历史可追溯到1843年,是库克斯港的最长记录。因此,考虑到较早的年份,这些潮汐仪(尤其是库克斯港)的数据将越来越重要。因此,分析了库克斯港的数据在多大程度上代表了德国海岸线的区域海平面变化。尽管无法在1924年之前弄清这一点,但发现从1924年起情况并非如此,当时可以将Cuxhaven的变化与从更大的数据集获得的变化进行比较。此外,发现在分析期末,年代际变化很大,值较高。但是,与早期相比,这些值并不罕见。

著录项

  • 来源
    《Ocean Dynamics》 |2011年第12期|p.2037-2050|共14页
  • 作者单位

    Institute for Coastal Research, Helmholtz-Zentrum Geesthacht, Max-Planck-Str. 1, 21502 Geesthacht, Germany;

    Institute for Coastal Research, Helmholtz-Zentrum Geesthacht, Max-Planck-Str. 1, 21502 Geesthacht, Germany;

    Research Institute for Water and Environment, University of Siegen, Paul-Bonatz-Str. 9-11, 57076 Siegen, Germany;

    Research Institute for Water and Environment, University of Siegen, Paul-Bonatz-Str. 9-11, 57076 Siegen, Germany;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    regional mean sea level changes; german bight; reconstruction methods; data homogenisation; accelerating sea level rise;

    机译:区域平均海平面变化;德国湾重建方法;数据同质化;加速海平面上升;

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