Mercury in the North Atlantic and Arctic Oceans - results of the 2014 GEOTRACES GEOVIDE & 2015 GEOTRACES TransArc II cruises
Mercury in the North Atlantic and Arctic Oceans - results of the 2014 GEOTRACES GEOVIDE & 2015 GEOTRACES TransArc II cruises
Abstract:
We will present the combined results of the French GEOTRACES GEOVIDE
cruise in the North Atlantic Ocean and the 2015 German GEOTRACES cruise
TransArc II in the central Arctic Ocean. Research vessel "Pourquoi pas?"
sailed on May 15th from Lisbon to Greenland to arrive in Newfoundland on
June 30th 2014, and icebreaker "Polarstern" sailed on August 17th from
Tromsoe to explore the Nansen, the Amundsen and the Makarov basins, to
arrive in Bremerhaven on October 15th 2015. Total mercury was sampled
using ultra-trace clean rosettes and determined on board. In the Atlantic
Ocean, surface waters of the Gulf Stream are cooled down as they travel
north, and mix at the same time with waters exiting the Arctic Ocean via
Fram Strait. These cool and dense surface waters dive to depth in the
Greenland and Labrador seas. The North Atlantic Ocean predominantly
receives Hg via atmospheric deposition from Europe and North America where
industrial Hg emissions peaked in the 1970s. The Hg inputs to the Arctic
Ocean are less well-constrained if not unknown. The current debate opposes
a primary atmospheric with a river-dominated scenario. We find consistent
surface depleted profiles in the North Atlantic Ocean, while we
exclusively observe surface enrichments in the Arctic Ocean, at all
sampling stations. We will make use of the combined data sets of both
cruises to investigate how climate may impact Hg marine biogeochemical
cycle, how anthropogenic Hg makes its way into the deep ocean and whether
the temporal evolution of emissions is traceable in water masses of
different ages. We will also put our new observations in context with
recent numerical model evaluations.