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Eldrett, James S; Greenwood, David R; Harding, Ian C; Huber, Matthew (2007): Pollen abundances, and temperature and precipitation reconstruction for the Eocene to Oligocene transition in northern high latitudes. PANGAEA, https://doi.org/10.1594/PANGAEA.770704, Supplement to: Eldrett, JS et al. (2009): Increased seasonality through the Eocene to Oligocene transition in northern high latitudes. Nature, 459(7249), 969-973, https://doi.org/10.1038/nature08069

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Abstract:
A profound global climate shift took place at the Eocene-Oligocene transition (~33.5 million years ago) when Cretaceous/early Palaeogene greenhouse conditions gave way to icehouse conditions (Zachos et al., 2001, doi:10.1126/science.1059412; Coxall et al., 2005, doi:10.1038/nature03135; Lear et al., 2008, doi:10.1130/G24584A.1). During this interval, changes in the Earth's orbit and a long-term drop in atmospheric carbon dioxide concentrations (Pagani et al., 2005, doi:10.1126/science.1110063; Pearson and Palmer, 2000, doi:10.1038/35021000; DeConto and Pollard, 2003, doi:10.1038/nature01290) resulted in both the growth of Antarctic ice sheets to approximately their modern size (Coxall et al., 2005, doi:10.1038/nature03135; Lear et al., 2008, doi:10.1130/G24584A.1) and the appearance of Northern Hemisphere glacial ice (Eldrett et al., 2007, doi:10.1038/nature05591; Moran et al., 2006, doi:10.1038/nature04800). However, palaeoclimatic studies of this interval are contradictory: although some analyses indicate no major climatic changes (Kohn et al., 2004, doi:10.1130/G20442.1; Grimes et al., 2005, doi:10.1130/G21019.1), others imply cooler temperatures (Zanazzi et al., 2007, doi:10.1038/nature05551), increased seasonality (Ivany et al., 2000, doi:10.1038/35038044; Terry, 2001, doi:10.1016/S0031-0182(00)00248-0) and/or aridity (Ivany et al., 2000, doi:10.1038/35038044; Terry, 2001, doi:10.1016/S0031-0182(00)00248-0; Sheldon et al., 2002, doi:10.1086/342865; Dupont-Nivet et al., 2007, doi:10.1038/nature05516). Climatic conditions in high northern latitudes over this interval are particularly poorly known. Here we present northern high-latitude terrestrial climate estimates for the Eocene to Oligocene interval, based on bioclimatic analysis of terrestrially derived spore and pollen assemblages preserved in marine sediments from the Norwegian-Greenland Sea. Our data indicate a cooling of ~5 °C in cold-month (winter) mean temperatures to 0-2 °C, and a concomitant increased seasonality before the Oi-1 glaciation event. These data indicate that a cooling component is indeed incorporated in the d18O isotope shift across the Eocene-Oligocene transition. However, the relatively warm summer temperatures at that time mean that continental ice on East Greenland was probably restricted to alpine outlet glaciers.
Project(s):
Coverage:
Median Latitude: 70.181878 * Median Longitude: 0.480027 * South-bound Latitude: 66.941400 * West-bound Longitude: -6.450300 * North-bound Latitude: 75.489200 * East-bound Longitude: 6.946800
Date/Time Start: 1985-08-03T06:07:00 * Date/Time End: 1995-08-07T04:15:00
Event(s):
104-643A * Latitude: 67.715000 * Longitude: 1.033300 * Date/Time Start: 1985-08-03T06:07:00 * Date/Time End: 1985-08-08T01:45:00 * Elevation: -2780.0 m * Penetration: 565.2 m * Recovery: 458.29 m * Location: Norwegian Sea * Campaign: Leg104 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 62 cores; 565.2 m cored; 0 m drilled; 81.1 % recovery
151-913B * Latitude: 75.489200 * Longitude: 6.946800 * Date/Time Start: 1993-09-16T12:17:00 * Date/Time End: 1993-09-20T20:30:00 * Elevation: -3330.0 m * Penetration: 770.3 m * Recovery: 210.29 m * Location: North Greenland Sea * Campaign: Leg151 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 51 core; 491.3 m cored; 0 m drilled; 42.8 % recovery
162-985A * Latitude: 66.941400 * Longitude: -6.450300 * Date/Time Start: 1995-08-03T13:58:00 * Date/Time End: 1995-08-07T04:15:00 * Elevation: -2788.0 m * Penetration: 587.9 m * Recovery: 553.42 m * Location: Norwegian Sea * Campaign: Leg162 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 62 cores; 587.9 m cored; 0 m drilled; 94.1 % recovery
Size:
7 datasets

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