A new database developed by the University of Cantabria (Spain) provides data on sea level variation due to atmospheric changes in the south of Europe between 1948 and 2009. Over the last two decades sea levels have increased in the Mediterranean basin.
"The meteorological sea level or meteorological tide component is the variation of the sea level as a result of atmospheric changes or more specifically, changes in the atmospheric pressure and the wind at the sea surface," Alba Cid explains to SINC, Alba being the lead author of the study published in the journal 'Climate Dynamics' which analyses 62 years' worth of data for this sea level component.
Cid and her team at the Environmental Hydraulics Institute at the University of Cantabria (Spain) have generated two (long-term and high resolution) time series for meteorological tides in the Atlantic and Mediterranean basins in the south of Europe and the Canary Islands.
In total, they have analysed the trends from 1948 to 2009, reflected in a new Global Ocean Surges (GOS) database. The simulation tool used is the numeric Regional Ocean Modelling System (ROMS) developed by the University of Rutgers (USA).
The results are very different depending on the period. "The trends from 1948 to 1989 are very small and negative in all of the area analysed, which means that the meteorological tide has decreased during this time period," points out Cid.
On the African coast of the Atlantic, the Adriatic coast and the north-east of the Eastern basin, the meteorological component to sea level has decreased by 0.35 millimetres for every year during this period. The trends are weaker on the Spanish coast of the north Atlantic and along the African coast in the Eastern basin of the Mediterranean.
However, over the last two decades, from 1989 to 2009, the trends are positive, or rather sea levels have increased, and to a greater degree. The tides present values of less than 0.5 mm per year in the Atlantic basin and more than 1 mm a year in several areas of the Mediterranean coast.
The GOS database also differentiates between summer and winter in each time series. According to the study, the trends observed in winter are negative in the areas analysed. The decrease in sea levels is more obvious (1mm per year) in the centre of the Mediterranean and the Adriatic Sea.
The sea level rises in summer, especially in the North Atlantic, the Spanish coast of the Mediterranean and the Tunisian coast. "Although negative trends of 0.3 mm a year can also be observed during this season along the African coast of the Atlantic," the researchers highlight from the study.
Hourly data for 62 years
To validate the results of the numerical simulations, the researchers have compared the data generated every hour from 1948 to 2009 in 58 coastal locations in Spain, Portugal, France, Italy and the Canary Islands, with real data measured by tide gauges and satellites. "The results have allowed us to calculate these long-term trends," adds Cid.
From this work and the data described in the article, the investigators are now analysing the most extreme levels and their relation to climate patterns, such as for example the North Atlantic oscillation (NAO). "We will shortly be publishing an article with the results obtained," concludes the lead author.
Alba et al. "A high resolution hindcast of the meteorological sea level component for Southern Europe: the GOS dataset" Climate Dynamics 43 (7-8): 2167-2184 october 2014 DOI: 10.1007/s00382-013-2041-0
SINC | EurekAlert!
Diving robots find Antarctic seas exhale surprising amounts of carbon dioxide in winter
16.08.2018 | National Science Foundation
Diving robots find Antarctic winter seas exhale surprising amounts of carbon dioxide
15.08.2018 | University of Washington
There are currently great hopes for solid-state batteries. They contain no liquid parts that could leak or catch fire. For this reason, they do not require cooling and are considered to be much safer, more reliable, and longer lasting than traditional lithium-ion batteries. Jülich scientists have now introduced a new concept that allows currents up to ten times greater during charging and discharging than previously described in the literature. The improvement was achieved by a “clever” choice of materials with a focus on consistently good compatibility. All components were made from phosphate compounds, which are well matched both chemically and mechanically.
The low current is considered one of the biggest hurdles in the development of solid-state batteries. It is the reason why the batteries take a relatively long...
New design tool automatically creates nanostructure 3D-print templates for user-given colors
Scientists present work at prestigious SIGGRAPH conference
Most of the objects we see are colored by pigments, but using pigments has disadvantages: such colors can fade, industrial pigments are often toxic, and...
Scientists at the University of California, Los Angeles present new research on a curious cosmic phenomenon known as "whistlers" -- very low frequency packets...
Scientists develop first tool to use machine learning methods to compute flow around interactively designable 3D objects. Tool will be presented at this year’s prestigious SIGGRAPH conference.
When engineers or designers want to test the aerodynamic properties of the newly designed shape of a car, airplane, or other object, they would normally model...
Researchers from TU Graz and their industry partners have unveiled a world first: the prototype of a robot-controlled, high-speed combined charging system (CCS) for electric vehicles that enables series charging of cars in various parking positions.
Global demand for electric vehicles is forecast to rise sharply: by 2025, the number of new vehicle registrations is expected to reach 25 million per year....
17.08.2018 | Event News
08.08.2018 | Event News
27.07.2018 | Event News
21.08.2018 | Materials Sciences
20.08.2018 | Information Technology
20.08.2018 | Life Sciences