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Latitudes

During this mission in the Austral and Cook Islands, we have covered more miles than any other Global Reef Expedition mission. During this month we will have surveyed 8 different islands in two countries and the Golden Shadow will cover 1650 nautical miles (1900 miles, 3056 km).

The Golden Shadow at the harbor in Rarotonga
The Golden Shadow at the harbor in Rarotonga

During this mission we will have started just outside of the tropics in Raivavae and moved slowly north the entire mission. Many will know that it gets colder the further away from the equator you get, and water temperatures are the same. So as we move from one place to the next the divers are happy to be further north and in warmer waters. The coldest we have recorded was 25.05 degrees (77.09 F) and the warmest so far has been 28.63 (83.53 F). That may not seem like a huge change in water temperatures, but it makes a big difference to the divers, and it also makes a big difference to the coral reefs! While there are cold water corals, the majority of hard corals like warm water temperatures and that is why you find them in the tropics.

This graph shows that the water temperatures around each island have gotten warmer the further we move north
This graph shows that the water temperatures around each island have gotten warmer the further we move north

 

(Photo 1 Erwan Delrieu-Trottin)

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