Surface water changes during transit from North Pole to Fram Strait


Contact
Michiel.Rutgers.v.d.Loeff [ at ] awi.de

Abstract

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.



Item Type
Conference (Invited talk)
Authors
Divisions
Primary Division
Programs
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Peer revision
Not peer-reviewed
Publication Status
Published
Event Details
Goldschmidt Conference, 18 Aug 2019 - 23 Aug 2019, Barcelona.
Eprint ID
50416
Cite as
Rutgers van der Loeff, M. , Casacuberta, N. , Wefing, A. M. , Laukert, G. , Bauch, D. , Paffrath, R. , Provost, C. , Karcher, M. , Meyer, H. , Schaffer, J. and Rabe, B. (2019): Surface water changes during transit from North Pole to Fram Strait , Goldschmidt Conference, Barcelona, 18 August 2019 - 23 August 2019 .


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