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June 12 2011

Satellite to map ocean salt levels launched

An example of 8 days of aquarius sea surface salinity (sss) data.The US space agency early yesterday launched a satellite to observe salt levels on the surface of the world’s oceans and measure how changes in salinity may be linked to the future climate.

The $US400 million ($A380 million) Aquarius/SAC-D spacecraft, a partnership with Argentina, will aim to map the entire open ocean every seven days from 657 kilometres above the Earth, producing monthly estimates that show how salt levels change over time and location.

”Data from this mission will advance our understanding of the ocean,” said Michael Freilich, director of NASA’s Earth Science Division in Washington.

NASA said the three-year mission would be ”the most detailed summary of conditions ever undertaken”.

via Satellite to map ocean salt levels launched.

Here are some details from the NASA site ( about as to why:

The research-related goals of Aquarius include a better understanding of:

  • The water cycle – 86% of global evaporation and 78% of global precipitation occur over the ocean; thus SSS is the key variable for understanding how fresh water input and output affects ocean dynamics
  • Ocean circulation - With temperature, salinity determines seawater density and buoyancy, driving the extent of ocean stratification, mixing, and water mass formation
  • Climate – As computer models evolve, Aquarius will provide the essential SSS data needed to link the two major components of the climate system: the water cycle and ocean circulation


Reposted fromSigalontech Sigalontech

April 06 2010

Trop de sel !

En 2008, Pierre Meneton, chercheur à l’Inserm, estimait que la consommation de sel en France – qui atteint 10 à 12 grammes par personne et par jour – était trois ou quatre fois supérieure aux besoins, et responsable chaque année d’au moins 75 000 accidents cardio-vasculaires. Selon lui, l’excès est principalement lié au sel contenu dans les produits préparés industriellement. Le « New England Journal of Medicine » vient de publier les travaux d’épidémiologistes appartenant à trois grandes universités américains (San Francisco, Stanford et ­Columbia), qui aboutissent à la même conclusion. Les chercheurs ont repris un modèle de calculs statistiques et mathématiques validés permettant des prévisions fiables dans le domaine ­cardio-vasculaire. Chez les Américains, consommant la même quantité de sel que les Français, une réduction de 3 grammes par jour permettrait de ­diminuer le nombre de nouveaux cas par an d’atteintes coronariennes de 60 000, d’AVC de 120 000, d’infarctus du myocarde de 99 000 à 54 000. Avec 1 gramme de sel en moins par jour, le bénéfice est divisé par trois.

Reposted fromScheiro Scheiro
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