title: Episodic release of CO2from the high-latitude North Atlantic Ocean during the last 135 kyr.
abstract: Antarctic ice cores document glacial-interglacial and millennial-scale variability in atmospheric pCO2over the past 800 kyr. The ocean, as the largest active carbon reservoir on this timescale, is thought to have played a dominant role in these pCO2fluctuations, but it remains unclear how and where in the ocean CO2was stored during glaciations and released during (de)glacial millennial-scale climate events. The evolution of surface ocean pCO2in key locations can therefore provide important clues for understanding the ocean's role in Pleistocene carbon cycling. Here we present a 135-kyr record of shallow subsurface pCO2and nutrient levels from the Norwegian Sea, an area of intense CO2uptake from the atmosphere today. Our results suggest that the Norwegian Sea probably acted as a CO2source towards the end of Heinrich stadials HS1, HS4 and HS11, and may have contributed to the increase in atmospheric pCO2at these times.
authors.affiliation: CAGE-Centre for Arctic Gas Hydrate, Environment and Climate, Department of Geosciences, UiT The Arctic University of Norway, 9037 Tromsø, Norway.|Department of Geology, Faculty of Science, Beni-Suef University, Beni-Suef 62511, Egypt.
authors.forename: Mohamed M
authors.identifier: 0000-0002-9475-0974
authors.initials: MM
authors.lastname: Ezat
authors.affiliation: CAGE-Centre for Arctic Gas Hydrate, Environment and Climate, Department of Geosciences, UiT The Arctic University of Norway, 9037 Tromsø, Norway.
authors.forename: Tine L
authors.initials: TL
authors.lastname: Rasmussen
authors.affiliation: Department of Earth and Environmental Sciences and Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York 10964, USA.
authors.forename: Bärbel
authors.initials: B
authors.lastname: Hönisch
authors.affiliation: Institute of Marine Environmental Sciences (MARUM), University of Bremen, Klagenfurterstrasse 2-4, D-28359 Bremen, Germany.
authors.forename: Jeroen
authors.initials: J
authors.lastname: Groeneveld
authors.affiliation: Department of Earth and Environmental Sciences and Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York 10964, USA.
authors.forename: Peter
authors.initials: P
authors.lastname: deMenocal