Toward understanding shelfbasin interactions: seasonal variability in the oxygen isotope composition

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Toward understanding shelf-basin interactions
seasonal variability in the oxygen isotope
composition of Arctic waters in conjunction with
other tracers
L.W. Cooper (University of Tennessee, Knoxville,
lcooper1_at_utk.edu ) R. Benner (University of South
Carolina, Columbia, benner_at_biol.sc.edu ) L.A.
Codispoti (University of Maryland Center for
Environmental Science, Cambridge,
codispot_at_hpl.umces.edu ) V. Kelly (University of
Maryland Center for Environmental Science,
Cambridge, vkelly_at_hpl.umces.edu ) J.W. McClelland
(Marine Biological Laboratory, Woods Hole,
jmcclelland_at_mbl.edu ) B. J. Peterson (Marine
Biological Laboratory, Woods Hole,
peterson_at_mbl.edu ) R. Holmes (Marine Biological
Laboratory, Woods Hole, rholmes_at_mbl.edu ) J.M.
Grebmeier (University of Tennessee, Knoxville,
jgrebmei_at_utk.edu ) XV International Symposium on
Marine Geology, Moscow, 17-21 November 2003
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Decline of salinity is due to sea ice melt
transport linked to ice algal bloom
Much less wind influence d18O change reflecting
water mass change smaller than sea ice melt signal
Water pumped through the ice from 3-4 m, Little
Diomede Island, April 2003
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"Biogeochemical Tracers in Arctic Rivers
Linking the Pan-Arctic Watershed to the Arctic
Ocean" (the "PARTNERS" project) Contacts
Bruce Peterson, Woods Hole, (peterson_at_mbl.edu)
Max Holmes, Woods Hole (rholmes_at_mbl.edu) Alexande
r Zhulidov, Rostov-on Don, Russia
(zhulidov_at_ncbcppi.rnd.runnet.ru) Slava Gordeev,
Moscow (gordeev_at_geo.sio.rssi.ru) Igor
Shiklomanov, St. Petersburg (ishiklom_at_zb3627.spb.e
du)
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Sea ice melt versus runoff sources of freshwater
PurpleMay-June GreenJuly-August
SBI data, 2002
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Dissolved organic materials versus d18O and
salinity
Brine injection
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Silicate (Bering Sea inflow marker) versus d18O
and salinity
Brine injection
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Denitrification marker N N(N-16P 2.90 µmol
kg-1) 0.87 Gruber and Sarmiento, 1997 Global
Biogeochem. Cycles 11 235-266
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River runoff held offshore over deep water
32.5
29.8
May-June 2002
33.6
Salinity
Sea ice melt on inshore surface
25.8
27.8
Brine-injected shelf water
33.0
33.2
Barrow Canyon section
July-August 2002
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River runoff held offshore over deep water
May-June 2002
July-August 2002
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May-June 2002
July-August 2002