From Global Warming Art
Complementary global network of long-term land-based temperature stations.
The Argo float network is an internationally managed system of ~3000 free-floating temperature and salinity sensors deployed throughout the oceans. These sensors communicate via satellite, drift on ocean currents, and have the ability to submerge to a depth of ~2 km to create vertical profiles.
The Argo network began in 1999 and greatly improves man's capacity to measure the global ocean. Prior to Argo, most large-scale, in situ climatology in the ocean was accomplished by attaching sensors to ships on a volunteer basis. However, this approach led to poor coverage away from major shipping lanes. Argo operates at a cost of ~$25,000 per float with an average lifetime of ~4 years per float.
This image was created by Robert A. Rohde by combining the Argo position records with the Blue Marble image of the Earth.
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