2026-10-15T09:07:53Z https://oai.datacite.org/oai

doi:10.1594/pangaea.735745 2025-11-04T01:21:31Z PANGAEA PANGAEA.REPOSITORY

Geochemical and palynological results of IODP Hole 302-M0004A from Lomonosov Ridge, Arctic Ocean 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 PANGAEA 2010 Collected: 2004-08-27T00:00:00 Issued: 2010 doi:10.1038/ngeo668 igsn:10.58100/IBCR0302RHVS001 Exp302 CCGS Captain Molly Kool (Vidar Viking) Integrated Ocean Drilling Program / International Ocean Discovery Program (IODP) 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. Supplement to: 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 (2009): Warm and wet conditions in the Arctic region during Eocene Thermal Maximum 2. Nature Geosciences, 2, 777-780 en Collection Supplementary Publication Series of Datasets application/zip Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode