Southern Ocean and Antarctic Peninsula temperatures during critical climate transitions of the Cenozoic constrained by clumped isotope thermometry

Author(s): Dill, R.; Eagle, Rob; Henry, D.; Praskin, S.; Mering, John A.; Petryshyn, V. A.; Priyadarshi, Antra; Rycroft, Lydia; Vollmer, T. D.; Chea, Yungwing; Dix, Jamie; Aguilar, Alejandro; Supakkul, Kev; Tran, B.; Lipel, Z.; Flores, S.; Riesselman, C. R.; Taviani, Marco; Marenssi, S.; Harwood, D. M.; Lunt, D. J.; Valdes, P. J.; Meckler, A. Nele; Tripati, A.
Author Affiliation(s): Primary:
University of California Los Angeles, Department of Earth, Planetary, and Space Sciences, Los Angeles, CA, United States
Other:
Imperial College London, United Kingdom
Colleyville Heritage High School, United States
Westlake High School, United States
North Hollywood High School, United States
University of Otago, New Zealand
CNR, Institute of Marine Science, Italy
Instituto Antártico Argentino, Argentina
University of Nebraska Lincoln, United States
University of Bristol, United Kingdom
Swiss Federal Institute of Technology, Switzerland
Volume Title: AGU 2014 fall meeting
Source: American Geophysical Union Fall Meeting, Vol.2014; American Geophysical Union 2014 fall meeting, San Francisco, CA, Dec. 15-19, 2014. Publisher: American Geophysical Union, Washington, DC, United States
Note: In English
Summary: The Southern Ocean and Antarctica play fundamental roles in the global climate system. These polar regions are a major area for the net loss of heat to space. Ice storage on Antarctica also influences the global water cycle. Through upwelling of deep waters, the Southern Ocean is an important regulator of atmospheric CO2. To better constrain the evolution of paleoclimate in this region over major climate transitions of the Cenozoic, we estimated ocean temperatures using clumped isotope thermometry. Clumped isotope thermometry is a thermodynamically-based stable isotope thermometer that can be used to constrain temperatures previously estimated using other paleothermometers (which in turn leads to constraints on ice volume), as it allows the exclusion of water isotope composition from temperature estimates (unlike the δ18O thermometer). We previously have published calibrations for foraminifera and mollusks, two of the major archives used in this study. Critical transitions investigated include the Eocene-Oligocene boundary and the Middle Miocene Climate Transition. Study sites include Seymour Island (Antarctic Peninsula), ANDRILL (Southern McMurdo Sounds), Ocean Drilling Program (ODP) Sites 689/690 (Weddell Sea), and ODP 744 (Kerguelen Plateau). Results will be compared to GCM output.
Year of Publication: 2014
Research Program: ODP Ocean Drilling Program
Key Words: 07 Marine Geology and Oceanography; Antarctic Peninsula; Antarctica; Cenozoic; Leg 113; Maud Rise; ODP Site 689; ODP Site 690; Ocean Drilling Program; Paleoclimatology; Southern Ocean; Weddell Sea
Coordinates: S643101 S643100 E0030600 E0030559
S650938 S650937 E0011218 E0011218
Record ID: 2015117258
Copyright Information: GeoRef, Copyright 2017 American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States