Reconstruction of Mediterranean coastal sea level at different timescales based on tide gauge records

IF 4.1 3区地球科学 Q2 METEOROLOGY & ATMOSPHERIC SCIENCES

Ocean Science Pub Date : 2022-12-16 DOI:10.5194/os-18-1781-2022

J. Ramos-Alcántara, D. Gomis, G. Jordà

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引用次数: 3

Abstract

Abstract. A coastal sea level reconstruction based on tide gauge observations is developed and applied to the western basin of the Mediterranean sea. The reconstructions are carried out in four frequency bands and are based on an optimal interpolation method in which the correlation between tide gauge data and all coastal points has been determined from the outputs of a numerical model. The reconstructions for frequencies lower than 1 month use monthly observations from the Permanent Service for Mean Sea Level (PSMSL) database and cover the period from 1884 to 2019. For the reconstruction of higher frequencies, hourly observations from the Global Extreme Sea Level Analysis (GESLA-2) dataset are used and cover from 1980 to 2015. Total sea level is retrieved with high accuracy from the merging of the different frequency bands. Results of a cross-validation test show that independent tide gauge series are highly correlated with the reconstructions. Moreover, they correlate significantly better with the reconstructions than with altimetry data in all frequency bands, and therefore the reconstruction represents a valuable contribution to the attempts of recovering coastal sea level. The obtained reconstructions allow us to characterize the coastal sea level variability, estimate coastal sea level trends along the entire coastline, and examine the correlation between western Mediterranean coastal sea level and the main North Atlantic climate indices. The limitations and applicability of the method to other regions are also discussed.

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基于潮汐计记录的地中海沿岸不同时间尺度海平面重建

摘要提出了一种基于测潮观测的沿海海平面重建方法，并将其应用于地中海西部海盆。重建工作在四个频带进行，并基于一种最优插值方法，其中潮汐计数据与所有海岸点之间的相关性是由数值模型的输出确定的。频率低于1个月的重建使用平均海平面常设服务(PSMSL)数据库的月度观测数据，覆盖时间为1884年至2019年。对于更高频率的重建，使用了全球极端海平面分析(GESLA-2)数据集的每小时观测数据，覆盖时间为1980年至2015年。通过不同频带的合并，可以获得高精度的总海平面。交叉验证结果表明，独立的潮量具序列与重建结果高度相关。此外，它们与重建数据的相关性明显优于与所有频段的高度计数据的相关性，因此重建对恢复沿海海平面的尝试做出了有价值的贡献。重建结果使我们能够描述沿海海平面的变化特征，估计整个海岸线的沿海海平面趋势，并检查西地中海沿海海平面与北大西洋主要气候指数之间的相关性。本文还讨论了该方法在其他地区的局限性和适用性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Ocean Science 地学-海洋学

CiteScore

5.90

自引率

6.20%

发文量

审稿时长

6-12 weeks

期刊介绍： Ocean Science (OS) is a not-for-profit international open-access scientific journal dedicated to the publication and discussion of research articles, short communications, and review papers on all aspects of ocean science: experimental, theoretical, and laboratory. The primary objective is to publish a very high-quality scientific journal with free Internet-based access for researchers and other interested people throughout the world. Electronic submission of articles is used to keep publication costs to a minimum. The costs will be covered by a moderate per-page charge paid by the authors. The peer-review process also makes use of the Internet. It includes an 8-week online discussion period with the original submitted manuscript and all comments. If accepted, the final revised paper will be published online. Ocean Science covers the following fields: ocean physics (i.e. ocean structure, circulation, tides, and internal waves); ocean chemistry; biological oceanography; air–sea interactions; ocean models – physical, chemical, biological, and biochemical; coastal and shelf edge processes; paleooceanography.