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Open AccessFeature PaperArticle

Steric Sea Level Changes from Ocean Reanalyses at Global and Regional Scales

1
Centre for Maritime Research and Experimentation, 19126 La Spezia SP, Italy
2
Helmholtz-Zentrum Geesthacht Centre for Materials and Coastal Research (HZG), 21502 Geesthacht, Germany
3
National Centre for Atmospheric Science, Department of Meteorology, University of Reading, Reading RG6 6AH, UK
4
State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China
5
Institute of Marine Sciences, National Research Council of Italy, 00133 Rome, Italy
*
Author to whom correspondence should be addressed.
Water 2019, 11(10), 1987; https://doi.org/10.3390/w11101987
Received: 31 July 2019 / Revised: 7 September 2019 / Accepted: 10 September 2019 / Published: 24 September 2019
(This article belongs to the Special Issue Past, Present and Future Trends in Sea Level Change)
Sea level has risen significantly in the recent decades and is expected to rise further based on recent climate projections. Ocean reanalyses that synthetize information from observing networks, dynamical ocean general circulation models, and atmospheric forcing data offer an attractive way to evaluate sea level trend and variability and partition the causes of such sea level changes at both global and regional scales. Here, we review recent utilization of reanalyses for steric sea level trend investigations. State-of-the-science ocean reanalysis products are then used to further infer steric sea level changes. In particular, we used an ensemble of centennial reanalyses at moderate spatial resolution (between 0.5 × 0.5 and 1 × 1 degree) and an ensemble of eddy-permitting reanalyses to quantify the trends and their uncertainty over the last century and the last two decades, respectively. All the datasets showed good performance in reproducing sea level changes. Centennial reanalyses reveal a 1900–2010 trend of steric sea level equal to 0.47 ± 0.04 mm year−1, in agreement with previous studies, with unprecedented rise since the mid-1990s. During the altimetry era, the latest vintage of reanalyses is shown to outperform the previous ones in terms of skill scores against the independent satellite data. They consistently reproduce global and regional upper ocean steric expansion and the association with climate variability, such as ENSO. However, the mass contribution to the global mean sea level rise is varying with products and its representability needs to be improved, as well as the contribution of deep and abyssal waters to the steric sea level rise. Similarly, high-resolution regional reanalyses for the European seas provide valuable information on sea level trends, their patterns, and their causes. View Full-Text
Keywords: ocean syntheses; historical reanalyses; data assimilation; steric sea level; sea level rise ocean syntheses; historical reanalyses; data assimilation; steric sea level; sea level rise
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Storto, A.; Bonaduce, A.; Feng, X.; Yang, C. Steric Sea Level Changes from Ocean Reanalyses at Global and Regional Scales. Water 2019, 11, 1987.

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