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Mediterranean Sea level trends from long-period tide gauge time series

Acta Oceanologica Sinica 2020年第1期39卷 157-165页

作者： Haddad Mahdi taibi hebib Centre of Space Techniques Algerian Space Agency

The main purpose of this study is to highlight, on the basis of statistical tests, the significant long-term changes of the Mediterranean Sea level, through the analysis of historical tide gauge records. In this framework, 14 tide gauge monthly series selected from the Permanent Service of the Mean Sea Level(PSMSL) database were used. The search for the presence or not of trends within these series, that have a temporal coverage from 59 to 142 years, was carried out using the Mann-Kendall test and the Sen’s slope estimator. The obtained results show that the Split Rt Marjana series are the only ones which does not exhibit a significant trend. The other 13 series show significant increasing trends. This result seems sufficient to suppose the presence, in the past century, of a new climatic phase on the scale of the Mediterranean basin, where the rising sea level is one of the consequences.

关键词： sea level tidal heights trend analysis Mann-Kendall test Sen’s slope estimates

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Estimating trends of the Mediterranean Sea level changes from tide gauge and satellite altimetry data (1993-2015)

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Journal of Oceanology and Limnology 2019年第4期37卷 1176-1185页

作者： taibi hebib HADDAD Mahdi Centre of Space Techniques(CTS)

The impact of climate change on sea level has received a great deal of attention by scientists worldwide. In this context, the problem of sea levels on global and regional scales have been analyzed in a number of studies based on tide gauges observations and satellite altimetry measurements. This study focuses on trend estimates from 18 high-quality tide gauge stations along the Mediterranean Sea coast. The seasonal Mann-Kendall test was run at a 5% significance level for each of the 18 stations for the period of 1993-2015 (satellite altimetry era). The results of this test indicate that the trends for 17 stations were statistically significant and showed an increase (no significant trend was observed only at one station). The rates of sea level change for the 17 stations that exhibit significant trends, estimated using seasonal Sen's approach, range after correction for Vertical Land Motion (VLM) from 1.48 to 8.72 mm/a for the period 1993-2015. Furthermore, the magnitude of change at the location of each tide gauge station was estimated using the satellite altimetry measurements. Thus, the results obtained agree with those from the tide-gauge data analysis.

关键词： sea level tidal height satellite altimetry trend analysis Mann-Kendall test Sen's slope estimates

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