Argo (oceanografi)

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Argo er et observationssystem af jordens verdenshave som giver realtidsdata til anvendelse indenfor klima-, vejr-, oceanografi- og fiskeriforskning. [1][2] [3] [4] Argo består af mere end 3000 små, frit drivende robotsonder i verdenshavene. Sonderne dykker ned til 2 km og flyder hver 10. dag op til overfladen. På vejen op måler sonderne vandets ledningsevne og temperaturprofil. Fra disse data beregnes salinitet og massefylde. Dataene sendes til forskere via satellit. Dataene er frit tilgængelige for alle, uden restriktioner. Det oprindelige projektmål, at søsætte 3.000 sonder, blev nået i november 2007.


Internationalt samarbejde[redigér | redigér wikikode]

Argo programmet er et samarbejde mellem 50 forsknings- og operationelleagenturer fra 26 lande, med USA bidragende med over halvdelen af udgifterne (status december 2004). Argo er en komponent af Integrated Ocean Observing System.

Dataresultater[redigér | redigér wikikode]

Josh Willis fra NASAs Jet Propulsion Laboratory har tidligere rapporteret at Argo systemet ikke har vist nogen havopvarmning siden det startede i 2003. "There has been a very slight cooling, but not anything really significant," har Willis udtalt. [5]

Men efter at målefejl er blevet fjernet fra måledataene, viser det sig at verdenshavene faktisk er blevet varmere siden 2003. [6]

Her er en graf baseret på Argo måledata frem til 2008/2009. [7]

Kilder[redigér | redigér wikikode]

  1. Welcome to the Argo home page
  2. Argo Begins Systematic Global Probing of the Upper Oceans Toni Feder, Phys. Today 53, 50 (2000), DOI:10.1063/1.1292477
  3. Richard Stenger (September 19, 2000). "Flotilla of sensors to monitor world's oceans". CNN. http://archives.cnn.com/2000/NATURE/09/19/ocean.sensors/index.html. Hentet 2007-10-28. 
  4. Nature: Artefacts in ocean data hide rising temperatures
  5. NPR report
  6. Nasa.gov: November 5, 2008 Correcting ocean cooling Citat: "...According to the float data on his computer screen, almost the entire Atlantic Ocean had gone cold. Unless you believe The Day After Tomorrow, Willis jokes, impossibly cold...side 3 “First, I identified some new Argo floats that were giving bad data...He was supposed to fly to Colorado that weekend to give a talk on “ocean cooling” to prominent climate researchers. Instead, he’d be talking about how it was all a mistake...What we found was that ocean heating was larger than scientists previously thought, and so the contribution of thermal expansion to sea level rise was actually 50 percent larger than previous estimates.”...“but also because the problems with the newest Argo data—the problems that Josh Willis found as well as other problems we have identified—haven’t been totally solved. For the most recent years [2003-2007], the sea level budget once again does not close. Our team is still working on that problem.”..."
  7. argo.ucsd.edu: How well is Argo able to observe global ocean changes? Global change observations. Ocean temperature and heat content

Eksterne henvisninger[redigér | redigér wikikode]

Koordinater: 38° 4′ N, 155° 3′ V