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SUMMARY:Modeling dissolved Pb concentrations in the Western Arctic Ocean: 
 the continued legacy of anthropogenic pollution - Birgit Rogalla (British 
 Antarctic Survey)
DTSTART:20251008T130000Z
DTEND:20251008T140000Z
UID:TALK236695@talks.cam.ac.uk
CONTACT:Katherine Turner
DESCRIPTION:Over the last century\, the supply of Pb by anthropogenic poll
 ution has strongly exceeded the natural supply to the atmosphere\, alterin
 g its cycling and resulting in serious human health consequences\, and mak
 ing its way into the oceans. The Arctic Ocean\, while remote\, has not bee
 n isolated from the impacts of Pb pollution. Over the past decade\, observ
 ational campaigns associated with the GEOTRACES program have greatly expan
 ded our knowledge of Pb cycling in the Arctic Ocean and have identified th
 at at present\, dissolved Pb (dPb) concentrations in the Arctic Ocean are 
 considered low. Nevertheless\, Pb isotope signatures suggest that anthropo
 genic pollution impacts the Arctic Ocean. Building on the new wealth of ob
 servations\, we developed the first three-dimensional model simulating dPb
  in Inuit Nunangat\, the Western Arctic Ocean\, to assess our current unde
 rstanding of Pb cycling\, quantify the role of anthropogenic pollution\, a
 nd to use dPb as a tracer of circulation of Atlantic and Pacific water mas
 ses. With simulations from 2002-2021\, we find that current and historical
  anthropogenic pollution account for at least 28% of dPb addition to the W
 estern Arctic Ocean. Advected water from the Pacific and North Atlantic Oc
 eans convey elevated pollution-derived dPb concentrations to the Arctic an
 d play a key role\, contributing 43% to the annual dPb budget. Lastly\, us
 ing dPb as tracer\, we track the seasonal extension of warm Atlantic Water
  along the West Greenland shelf where it is a potential source of heat to 
 marine-terminating glaciers\, and we trace occasional dense overflows of A
 tlantic Water into the deep Baffin Bay interior. 
LOCATION:BAS Seminar Room 2
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