2026-04-04T01:45:19Z https://oai.datacite.org/oai

doi:10.1594/pangaea.858994 2024-07-20T14:42:32Z PANGAEA PANGAEA.REPOSITORY

22 PANGAEA.REPOSITORY 10.1594/PANGAEA.858994 Warny, Sophie Sophie Warny 0000-0002-3451-040X Askin, R A R A Askin Hannah, Mike J Mike J Hannah Mohr, Barbara A R Barbara A R Mohr Raine, J Ian J Ian Raine 0000-0001-5294-2102 Harwood, David M David M Harwood 0000-0002-9449-2127 Florindo, Fabio Fabio Florindo 0000-0002-6058-9748 PANGAEA 2009 Core DEPTH, sediment/rock Palynomorpha Nothofagidites spp. Podocarpidites sp. Palynomorpha, terrestrial Algae, freshwater Pyxidinopsis braboi Operculodinium centrocarpum Drilling/drill rig SMS McMurdo Station Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas (SPP1158) 2007-10-10T12:00:00/2007-11-30T12:00:00 Supplementary Dataset 10.1130/G30139A.1 348 data points text/tab-separated-values Creative Commons Attribution 3.0 Unported An exceptional triple palynological signal (unusually high abundance of marine, freshwater, and terrestrial palynomorphs) recovered from a core collected during the 2007 ANDRILL (Antarctic geologic drilling program) campaign in the Ross Sea, Antarctica, provides constraints for the Middle Miocene Climatic Optimum. Compared to elsewhere in the core, this signal comprises a 2000-fold increase in two species of dinoflagellate cysts, a synchronous five-fold increase in freshwater algae, and up to an 80-fold increase in terrestrial pollen, including a proliferation of woody plants. Together, these shifts in the palynological assemblages ca. 15.7 Ma ago represent a relatively short period of time during which Antarctica became abruptly much warmer. Land temperatures reached 10 °C (January mean), estimated annual sea-surface temperatures ranged from 0 to 11.5 °C, and increased freshwater input lowered the salinity during a short period of sea-ice reduction. Another version of this data can be found at http://www.geosociety.org/pubs/ft2009.htm with number 2009235. Supplement to: Warny, Sophie; Askin, R A; Hannah, Mike J; Mohr, Barbara A R; Raine, J Ian; Harwood, David M; Florindo, Fabio (2009): Palynomorphs from a sediment core reveal a sudden remarkably warm Antarctica during the middle Miocene. Geology, 37(10), 955-958 165.276765 -77.758141 McMurdo Sound German Research Foundation https://doi.org/10.13039/501100001659 5472008 Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas