TY - SER ID - sluijs2010gapr T1 - Geochemical and palynological results of IODP Hole 302-M0004A from Lomonosov Ridge, Arctic Ocean AU - Sluijs, Appy AU - Schouten, Stefan AU - Donders, Timme H AU - Schoon, Petra L AU - Röhl, Ursula AU - Reichart, Gert-Jan AU - Sangiorgi, Francesca AU - Kim, Jung-Hyun AU - Sinninghe Damsté, Jaap S AU - Brinkhuis, Henk PY - 2010/03/26/ T2 - 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, https://doi.org/10.1038/NGEO668 PB - PANGAEA DO - 10.1594/PANGAEA.735745 UR - https://doi.org/10.1594/PANGAEA.735745 N2 - 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. ER -