RRS Discovery arrived at South Georgia on 2 November 2017 as part of the AMT4SentinelFRM voyage (first image). South Georgia has an epic history – in 1914 Sir Ernest Shackleton set sail for the island on Endurance from the UK. He reached the Wedell Sea in 1915 where upon pack ice closed in on the ship and wrecked it. Shackleton and five other men managed to flee the ship and reach the southern coast of South Georgia. From there they launched a rescue operation to save the remaining 28 sailors who had fled the ship to Elephant Island. In 1922, Shackleton planned to return to Grytviken, but prior to the voyage he suffered a heart attack and died. His grave and that of his right hand man during the voyage, Frank Wild, reside in the cemetery at Grytviken (second image). Why did the RRS Discovery undertake such a risky voyage? One of the reasons is that the South Atlantic Gyre and the Southern Subtropical Convergence zone are difficult to access and sparsely sampled. Projects such as the Copernicus AMT4SentinelFRM enable the collection of vital data for providing quality assurance of products from the Copernicus Sentinel missions. After verifying the accuracy of these products, the data are used to monitor the ocean, this blue planet that we depend on for food and for regulating our atmosphere.
The third image is an example of the satellite imagery that the AMT4SentinelFRM mission is trying to calibrate and validate (CAL/VAL). It is an advanced very-high-resolution radiometer (AVHRR) sea-surface temperature median composite on 18–24 October 2017. The South Subtropical Convergence Zone is demarked from the Southern Gyre by the green band of 15C water.
#RRSDiscovery #Discovert #boat #SouthGeorgia #AMT4SentinelFRM #Copernicus #SentinelMissions #Sentinel #calibration #validation #verification #ocean #EpicHistory #SirErnestShackleton #Shackleton #Endurance #WedellSea #RescueOperation #ElephantIsland #Grytviken
, #FrankWild #GreatExplorers
Images 1-2: Plymouth Marine Laboratory (PML)
Image 3: Satellite imagery provided by Silvia Pardo, National Earth Observation Data Archive and Analysis Service