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Nuevas tecnologías para el seguimiento de la acidificación marina en el espacio natural Costa del Garraf April 19, 2012

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Fuente: Fundación Biodiversidad

El proyecto propuesto desarrollará sistemas específicos para la medición de pH marino y CO2 atmosférico en la Costa del Garraf.

El aumento del contenido de CO2 en la atmósfera debido a las actividades antrópicas está provocando, a través del efecto invernadero y debido a que buena parte del CO2 emitido está siendo absorbido por los mares y océanos, una progresiva acidificación de sus aguas, lo cual tiene efectos devastadores para muchos organismos marinos.

Los sistemas de medición del pH marino y el CO2 atmosférico se implementarán en el observatorio OBSEA que, por sus características únicas, es especialmente idóneo para la toma de medidas en continuo a altas frecuencias de los diferentes parámetros de interés de una forma integrada.

Se pretende así optimizar el conjunto de observaciones que se están realizando a lo largo de la costa catalana y que, adecuadamente coordinados, pueden dar lugar a una sólida base de datos de utilidad para los estudios de cambio climático.

Los objetivos específicos son:

  • Creación de un observatorio marino para la monitorización del cambio climático, ubicado en Colls-Miralpeix, tomando como punto de partida el observatorio submarino OBSEA.
  • Estudio de los cambios químicos en el agua de mar debidos al aumento del CO2 antropogénico. Se propone desarrollar un medidor de pH que, junto con la pCO2 (presión parcial de CO2 en el agua), son las únicas variables del sistema del CO2 en agua de mar medibles en la actualidad con sistemas autónomos.
  • Para complementar las medidas de pH, se propone instalar un medidor de CO2 en la estación meteorológica de superficie, integrada dentro del portal del observatorio OBSEA.
  • Alcanzar protocolos de integración de sensores y lograr una gestión de calidad.

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Ocean acidification gets deep in the Mediterranean Sea! April 13, 2012

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Source: MedSeA

Scientists within the MedSeA project have been examining the concentration of human-produced carbon, taken from Mediterranean field measurements, which is high and unusually penetrating deeper waters. Typically ocean acidification (pH decrease) affects the sea surface but this work has identified evidence of pH decrease throughout the water column, with the effect being more prominent in the NW Mediterranean Sea. Due to the complexity and high variability of the Mediterranean basin, ocean acidification will have different regional impacts, such as in regions where projections of (winter and summer) sea surface temperature are likely to increase up to 2oC by the year 2050, if rates of anthropogenic CO2 emissions continue at today’s rate.

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Ongoing ocean acidification research and impacts on southern Atlantic Ocean and Mediterranean Sea December 21, 2011

Posted by euccmed in Mediterranean News, Research&Projects.
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By Magdalena A K Muir, EUCC Advisory Board

Today carbon dioxide is increasing in the atmosphere faster than land and oceans can absorb it,  and the average acidity of the oceans has increased . Two ongoing European projects on Ocean Acidification EPOCA (European project on ocean acidification) and MedSeA (The European Mediterranean Sea Acidification in a changing climate) consider these issues forEuropes. Jean-Pierre Gattuso, research scientist at the Laboratoire d’océanographie de Villefranche (CNRS/UPMC) is EPOCA’s co-ordinator and a member of the scientific steering committeee of MedSeA. In a recent interview, he discusses ocean acidification for all of Europe’s seas and oceans, whether the Arctic Ocean, the Atlantic Ocean or theMediterranean Sea. Highlights and research efforts for theMediterranean Seaare provided below:

Ocean acidification is a very recent science, so difficult to predict  the future of the southern Atlantic Ocean and Mediterranean Seain high CO2 conditions. In the Mediterranean, Posidonia oceanica, which is using CO2 for photosynthesis, so when it has more CO2 it grows faster and it benefits from higher CO2 levels, in contrast with most of the other algae and plants which use bicarbonate.The main negative aspect is for calcifiers. As ocean acidification proceeds, carbonate becomes less  abundant, so carbonate concentration in water limits the precipitation of calcium carbonate, and organisms have a harder time to make their shells and skeletons. In parallel, water becomes more  corrosive, with greater damage to shells and skeleton. Some organisms are becoming  fragile as they dissolve faster than their shell is built. There is a clear need for research on these biogeochemical impacts, and EU is leading through the work of EPOCA and  MedSeA.

Ocean acidification is progressing faster in colder water because gas is more soluble in cold water and dissolves faster. As CO2 increases in the atmosphere and goes into the water, the corrosiveness of water or the impact of the increasing acidity appears first in the polar oceans and later in temperate and tropical seas such as theMediterranean Sea. TheArcticis a hot spot for ocean acidification as it is for global warming and sea ice melting. EPOCA has done a lot of work in the Arctic both in terms of chemistry and of biological response.  Biologically, even if  ocean acidification progresses slower in temperate and tropical waters, the combination of ocean acidification and warm temperature is a bad recipe for  Mediterranean coral reefs. In EPOCA, ocean acidification work is occurring along the coasts ofFrance,SpainandPortugal, and the Canary current close to the Canary islands, with comparitive work in the Gulf of California, the PacificOcean andFiji. Within MedSeA, other research is conducted. For example, in Corsica andCrete, a mesocosm experiments are conducted where impacts of different CO2 levels on large enclosures water and marine organisms over 6 to 8 week periods. The Institut de Ciencies del Mar, CSIC,Barcelona,  is measuring the response of commercial mollusks to ocean acidification levels in the sea and in lab conditions. MedSeA translates research obtained in the lab and the sea, with socio-economic partners translating biological and biogeochemical information into socio-economic impacts.

A complete text of the interview is found at:

http://www.youris.com/Environment/Interviews/JeanPierre_Gattuso__To_Face_The_Negative_Effects_Of_Ocean_Acidification_A_LargeScale_Solution_Is_Inevitable.kl

Further information available at the websites of two EU projects on ocean acidification:

European project on ocean acidification: http://www.epoca-project.eu/

The European Mediterranean Sea Acidification in a changing climate: http://medsea-project.eu/

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