Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Mediterranean meteorological tide has increased by over a millimetre a year since 1989

24.11.2014

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.


This is Les Rotes beach in Denia (Alicante, Spain).

Credit: Echiner1

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.


References:

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!
Further information:
http://www.fecyt.es/fecyt/home.do

Further reports about: African Climate Dynamics GOS Mediterranean Ocean long-term sea level

More articles from Earth Sciences:

nachricht NASA's AIM observes early noctilucent ice clouds over Antarctica
05.12.2016 | NASA/Goddard Space Flight Center

nachricht GPM sees deadly tornadic storms moving through US Southeast
01.12.2016 | NASA/Goddard Space Flight Center

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Shape matters when light meets atom

Mapping the interaction of a single atom with a single photon may inform design of quantum devices

Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...

Im Focus: Novel silicon etching technique crafts 3-D gradient refractive index micro-optics

A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.

Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...

Im Focus: Quantum Particles Form Droplets

In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.

“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...

Im Focus: MADMAX: Max Planck Institute for Physics takes up axion research

The Max Planck Institute for Physics (MPP) is opening up a new research field. A workshop from November 21 - 22, 2016 will mark the start of activities for an innovative axion experiment. Axions are still only purely hypothetical particles. Their detection could solve two fundamental problems in particle physics: What dark matter consists of and why it has not yet been possible to directly observe a CP violation for the strong interaction.

The “MADMAX” project is the MPP’s commitment to axion research. Axions are so far only a theoretical prediction and are difficult to detect: on the one hand,...

Im Focus: Molecules change shape when wet

Broadband rotational spectroscopy unravels structural reshaping of isolated molecules in the gas phase to accommodate water

In two recent publications in the Journal of Chemical Physics and in the Journal of Physical Chemistry Letters, researchers around Melanie Schnell from the Max...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

ICTM Conference 2017: Production technology for turbomachine manufacturing of the future

16.11.2016 | Event News

Innovation Day Laser Technology – Laser Additive Manufacturing

01.11.2016 | Event News

#IC2S2: When Social Science meets Computer Science - GESIS will host the IC2S2 conference 2017

14.10.2016 | Event News

 
Latest News

High-precision magnetic field sensing

05.12.2016 | Power and Electrical Engineering

Construction of practical quantum computers radically simplified

05.12.2016 | Information Technology

NASA's AIM observes early noctilucent ice clouds over Antarctica

05.12.2016 | Earth Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>