FN Archimer Export Format
PT J
TI Plateaus and jumps in the atmospheric radiocarbon record – potential origin and value as global age markers for glacial-to-deglacial paleoceanography, a synthesis
BT 
AF Sarnthein, Michael
   Küssner, Kevin
   Grootes, Pieter M.
   Ausin, Blanca
   Eglinton, Timothy
   Muglia, Juan
   Muscheler, Raimund
   Schlolaut, Gordon
AS 1:1;2:2;3:3;4:4,8;5:8;6:5;7:6;8:7;
FF 1:;2:;3:;4:;5:;6:;7:;8:;
C1 Institute of Geosciences, University of Kiel, Olshausenstr. 40, 24098 Kiel, Germany
   Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Department for Marine Geology, 27570 Bremerhaven, Germany
   Institute of Ecosystem Research, University of Kiel, Olshausenstr. 40, 24098 Kiel, Germany
   Geology Department, University of Salamanca, Plaza de los Caldos, 37008 Salamanca, Spain
   Centro para el Estudio de los Sistemas Marinos, CONICET, 2915 Boulevard Brown, U9120ACD, Puerto Madryn, Argentina
   Quaternary Sciences, Department of Geology Lund University, Sölvegatan 12, 22362 Lund, Sweden
   Climate Dynamics and Landscape Evolution, GFZ German Centre for Geosciences, Telegrafenberg, 14473 Potsdam, Germany
   Geological Institute, ETH Zürich, Sonneggstr. 5, 8092 Zurich, Switzerland
C2 UNIV KIEL, GERMANY
   INST A WEGENER, GERMANY
   UNIV KIEL, GERMANY
   UNIV SALAMANCA, SPAIN
   CONICEY, ARGENTINA
   UNIV LUND, SWEDEN
   GFZ, GERMANY
   ETH ZURICH, SWITZERLAND
IN DOAJ
IF 4.295
TC 7
UR https://archimer.ifremer.fr/doc/00665/77699/79779.pdf
   https://archimer.ifremer.fr/doc/00665/77699/79780.pdf
   https://archimer.ifremer.fr/doc/00665/77699/79781.pdf
   https://archimer.ifremer.fr/doc/00665/77699/79782.pdf
LA English
DT Article
CR IMAGES V LEG 1-MD114
   IMAGES V LEG 4-MD114
   IMAGES V LEG 5
   MD 122 / WEPAMA
   MD 126 / MONA
   MD 168 / AMOCINT (IMAGES XVII)
   MD159 / PACHIDERME
   VT 90 / SOUC
BO Marion Dufresne
AB Changes in the geometry of ocean meridional overturning circulation (MOC) are crucial in controlling past changes of climate and the carbon inventory of the atmosphere. However, the accurate timing and global correlation of short-term glacial-to-deglacial changes of MOC in different ocean basins still present a major challenge. The fine structure of jumps and plateaus in atmospheric and planktic radiocarbon (14C) concentration reflects changes in atmospheric 14C production, ocean–atmosphere 14C exchange, and ocean mixing. Plateau boundaries in the atmospheric 14C record of Lake Suigetsu, now tied to Hulu Cave U∕Th model ages instead of optical varve counts, provide a stratigraphic “rung ladder” of up to 30 age tie points from 29 to 10 cal ka for accurate dating of planktic oceanic 14C records. The age differences between contemporary planktic and atmospheric 14C plateaus record the global distribution of 14C reservoir ages for surface waters of the Last Glacial Maximum (LGM) and deglacial Heinrich Stadial 1 (HS-1), as documented in 19 and 20 planktic 14C records, respectively. Elevated and variable reservoir ages mark both upwelling regions and high-latitude sites covered by sea ice and/or meltwater. 14C ventilation ages of LGM deep waters reveal opposed geometries of Atlantic and Pacific MOC. Like today, Atlantic deep-water formation went along with an estuarine inflow of old abyssal waters from the Southern Ocean up to the northern North Pacific and an outflow of upper deep waters. During early HS-1, 14C ventilation ages suggest a reversed MOC and ∼1500-year flushing of the deep North Pacific up to the South China Sea, when estuarine circulation geometry marked the North Atlantic, gradually starting near 19 ka. High 14C ventilation ages of LGM deep waters reflect a major drawdown of carbon from the atmosphere. The subsequent major deglacial age drop reflects changes in MOC accompanied by massive carbon releases to the atmosphere as recorded in Antarctic ice cores. These new features of MOC and the carbon cycle provide detailed evidence in space and time to test and refine ocean models that, in part because of insufficient spatial model resolution and reference data, still poorly reproduce our data sets. 
PY 2020
PD DEC
SO Climate Of The Past
SN 1814-9324
PU European Geosciences Union
VL 16
IS 6
UT 000603351300003
BP 2547
EP 2571
DI 10.5194/cp-16-2547-2020
ID 77699
ER

EF