Orbitally forced climate changes in the Tasman sector during the middle Eocene

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doi: 10.1016/j.palaeo.2009.06.023
Author(s): Warnaar, Jeroen; Bijl, Peter K.; Huber, Matthew; Sloan, Lisa; Brinkhuis, Henk; Rohl, Ursula; Sriver, Ryan; Visscher, Henk
Author Affiliation(s): Primary:
Utrecht University, Laboratory of Paleobotany and Palynology, Utrecht, Netherlands
Purdue University, United States
University of California, Santa Cruz, United States
Unversity of Bremen, Federal Republic of Germany
Volume Title: Palaeogeography, Palaeoclimatology, Palaeoecology
Source: Palaeogeography, Palaeoclimatology, Palaeoecology, 280(3-4), p.361-370. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0031-0182 CODEN: PPPYAB
Note: In English. 42 refs.; illus., incl. 1 table, sketch map
Summary: The influence of orbital precession on early Paleogene climate and ocean circulation patterns in the southeast Pacific region is investigated by combining environmental analyses of cyclic Middle Eocene sediments and palynomorph records recovered from ODP Hole 1172A on the East Tasman Plateau with climate model simulations. Integration of results indicates that in the marine realm, direct effects of precessional forcing are not pronounced, although increased precipitation/runoff could have enhanced dinoflagellate cyst production. On the southeast Australian continent, the most pronounced effects of precessional forcing were fluctuations in summer precipitation and temperature on the Antarctic Margin. These fluctuations resulted in vegetational changes, most notably in the distribution of Nothofagus (subgenus Brassospora). The climate model results suggest significant fluctuations in sea ice in the Ross Sea, notably during Austral summers. This is consistent with the influx of Antarctic heterotrophic dinoflagellates in the early part of the studied record. The data demonstrate a strong precessionally driven climate variability and thus support the concept that precessional forcing could have played a role in early Antarctic glaciation via changes in runoff and/or precipitation. Abstract Copyright (2009) Elsevier, B.V.
Year of Publication: 2009
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Australasia; Australia; Cenozoic; Climate change; Climate forcing; Dinoflagellata; Eastern Tasman Plateau; Eocene; General circulation models; Leg 189; Microfossils; Middle Eocene; ODP Site 1172; Ocean Drilling Program; Orbital forcing; Pacific Ocean; Paleo-oceanography; Paleoclimatology; Paleogene; Palynomorphs; Patterns; South Pacific; Southern Ocean; Southwest Pacific; Tasman Sea; Tasmania Australia; Tertiary; West Pacific
Coordinates: S435800 S435700 E1495600 E1495500
Record ID: 2009097827
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands