Surface water changes during transit from North Pole to Fram Strait
ORCID: https://orcid.org/0000-0003-1393-3742, Casacuberta, Núria, Wefing, Anne-Marie, Laukert, Georgi, Bauch, D., Paffrath, Ronja, Provost, Christine, Karcher, Michael
ORCID: https://orcid.org/0000-0002-9587-811X, Meyer, Hanno
ORCID: https://orcid.org/0000-0003-4129-4706, Schaffer, Janin
ORCID: https://orcid.org/0000-0002-1395-7851 and Rabe, Benjamin
ORCID: https://orcid.org/0000-0001-5794-9856
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Ice drift recorded by ice buoys show a relatively direct pathway of ice from the North Pole to Fram Strait. An ice tethered buoy deployed in 2015 during GEOTRACES section GN04 at 89°N was recovered in August 2016 at 76°43N in Fram Strait during GEOTRACES section GN05. Does the surface water follow a similar pathway? Tracer data collected during these two expeditions are used to investigate to what extent the water in the East Greenland Current (EGC) can be considered a downstream extension of the Transpolar Drift (TPD) at the North Pole. The reduction of 228Ra activities and 129I/236U ratios in the EGC compared to the TPD can be explained either by a much longer (order 3-4 years) travel time than suggested by the ice drift, or by admixture of surface waters from other, presumably Pacific sources. The pathways followed by surface water in a coupled sea-ice-ocean model suggest that the transit of surface water is indeed much more erratic and time consuming than the transit of ice. We will discuss whether N/P ratios or Nd isotopes give evidence for a change in the contribution of Pacific waters.
ORCID: https://orcid.org/0000-0003-1393-3742, Casacuberta, Núria, Wefing, Anne-Marie, Laukert, Georgi, Bauch, D., Paffrath, Ronja, Provost, Christine, Karcher, Michael
ORCID: https://orcid.org/0000-0002-9587-811X, Meyer, Hanno
ORCID: https://orcid.org/0000-0003-4129-4706, Schaffer, Janin
ORCID: https://orcid.org/0000-0002-1395-7851 and Rabe, Benjamin
ORCID: https://orcid.org/0000-0001-5794-9856
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PS > 100
