Abstract
The Nansen Legacy paleo cruise was carried out from September 26 to October 20, 2018 with RV “Kronprins Haakon”. The cruise took place in the northern Barents Sea and the Nansen Basin, and it went through the sea ice to 83.3 N. The overriding objective of the cruise was to reconstruct the natural variability and range of sea ice cover and Atlantic Water through flow in the Barents Sea on longer time scales. During the cruise four ocean moorings were deployed in northwest Barents Sea, where one ARGO float was also deployed. Twelve “paleo stations” were identified using multibeam and sub bottom profilers. At these stations, short and long sediment cores were obtained. This cruise report gives an overview of methods used and samples taken.
Highlights
The Nansen Legacy paleo cruise is part of the Nansen Legacy project which is investigating climate and ecosystem change of the Barents Sea and adjacent Arctic Basin
The materials recovered here, together with the planned postcruise analysis, will enable assessment of the changes associated with prior intervals of diminished sea ice cover and higher temperatures than those experienced within the instrumental period
For NPAL14 and NPAL15 we present a comparison of the multicore and gravity core colour results
Summary
The Nansen Legacy paleo cruise was carried out from September 26 to October 20, 2018 with RV “Kronprins Haakon”. Twelve “paleo stations” were identified using multibeam and sub bottom profilers At these stations, short and long sediment cores were obtained securing the material necessary for analysis of living and fossil foraminiferal faunas in addition to fossil diatoms and dinocysts. Preliminary analysis of the sediment cores demonstrated that a good intra-station overlap was achieved between the multi and gravity cores. Pore water isotope data confirmed the good overlap achieved in recovery between the multi and gravity cores as both have similar (overlapping) pore water profiles with depth. There was additional time in the end of the cruise to carry out an unscheduled task, namely recovery of an additional Nansen ocean mooring at the Yermak Plateau. Its planned recovery on the previous cruise had not been possible due to bad weather
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