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Sluijs, Appy; Schouten, Stefan; Donders, Timme H; Schoon, Petra L; Röhl, Ursula; Reichart, Gert-Jan; Sangiorgi, Francesca; Kim, Jung-Hyun; Sinninghe Damsté, Jaap S; Brinkhuis, Henk (2010): Geochemical and palynological results of IODP Hole 302-M0004A from Lomonosov Ridge, Arctic Ocean. PANGAEA,, Supplement to: Sluijs, A et al. (2009): Warm and wet conditions in the Arctic region during Eocene Thermal Maximum 2. Nature Geosciences, 2, 777-780,

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Several episodes of abrupt and transient warming, each lasting between 50,000 and 200,000 years, punctuated the long-term warming during the Late Palaeocene and Early Eocene (58 to 51 Myr ago) epochs**1,2. These hyperthermal events, such as the Eocene Thermal Maximum 2 (ETM2) that took place about 53.5 Myr ago**2, are associated with rapid increases in atmospheric CO2 content. However, the impacts of most events are documented only locally**3,4. Here we show, on the basis of estimates from the TEX86' proxy, that sea surface temperatures rose by 3-5 °C in the Arctic Ocean during the ETM2. Dinoflagellate fossils demonstrate a concomitant freshening and eutrophication of surface waters, which resulted in euxinia in the photic zone. The presence of palm pollen implies**5 that coldest month mean temperatures over the Arctic land masses were no less than 8 °C, in contradiction of model simulations that suggest hyperthermal winter temperatures were below freezing**6. In light of our reconstructed temperature and hydrologic trends, we conclude that the temperature and hydrographic responses to abruptly increased atmospheric CO2 concentrations were similar for the ETM2 and the better-described Palaeocene-Eocene Thermal Maximum**7,8, 55.5 Myr ago.
Latitude: 87.866580 * Longitude: 136.177350
Date/Time Start: 2004-08-27T00:00:00 * Date/Time End: 2004-08-27T00:00:00
302-M0004A (ACEX-M4A) * Latitude: 87.866580 * Longitude: 136.177350 * Date/Time: 2004-08-27T00:00:00 * Elevation: -1287.9 m * Penetration: 427.9 m * Recovery: 85.91 m * Location: Arctic Ocean * Campaign: Exp302 (Arctic Coring Expedition, ACEX) * Basis: Vidar Viking * Device: Drilling/drill rig (DRILL)
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