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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 (aquarius.nasa.gov) 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

January 21 2010

Instrument des Tages (144): Die Meeresorgel von Zadar

Dort, wo die kroatische Stadt Zadar ins Meer grenzt, sind seit 2005 eine Anzahl dicker, schwarzer Röhren entland des Uferwegs zu sehen und vor allem zu hören. Es sind die 35 Pfeifen der Meeresorgel von Zadar. Das Instrument wird von der Brandung gespielt. Das Wasser schiebt Luft durch die unterschiedlich großen Röhren, deren Klang sich zu eigentümlichen Akkorden und dissonanten Melodien verbindet.

Das Video ist nicht wirklich anschaulich, auch wenn man die Orgelröhren gelegentlich erkennen kann. Es ist aber als Hörbeispiel brauchbar:


(Gefunden bei weburbanist)

Ähnliche Instrumente gibt es auch in San Francisco und im britischen Blackpool.

Und hier die → Instrumente des Tages Numero 1 bis 143.



Reposted fromglaserei glaserei
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