Shevenell, Amelia E. et al. (2004): Middle Miocene Southern Ocean cooling and Antarctic cryosphere expansion

Leg/Site/Hole:
ODP 189
Identifier:
2005-032178
georefid
10.1126/science.1100061
doi
Creator:
Shevenell, Amelia E.
University of California at Santa Barbara, Department of Geological Sciences, Santa Barbara, CA, United States
author
Kennett, James P.
author
Lea, David W.
author
Identification:
Middle Miocene Southern Ocean cooling and Antarctic cryosphere expansion
2004
Science
American Association for the Advancement of Science, Washington, DC, United States
305
5691
1766-1770
Magnesium/calcium data from Southern Ocean planktonic foraminifera demonstrate that high-latitude ( approximately 55 degrees S) southwest Pacific sea surface temperatures (SSTs) cooled 6 degrees to 7 degrees C during the middle Miocene climate transition (14.2 to 13.8 million years ago). Stepwise surface cooling is paced by eccentricity forcing and precedes Antarctic cryosphere expansion by approximately 60 thousand years, suggesting the involvement of additional feedbacks during this interval of inferred low-atmospheric partial pressure of CO (sub 2) (p (sub CO2) ). (modif. j. abstr.)
English
Serial
Coverage:Geographic coordinates:
North:-42.3000
West:-180.0000East: 180.0000
South:-90.0000
Stratigraphy; alkaline earth metals; Antarctic ice sheet; Antarctica; calcite; calcium; carbon; carbon cycle; carbon dioxide; carbonates; Cenozoic; chemical ratios; climate change; climate forcing; cooling; Foraminifera; geochemical cycle; Globigerina; Globigerina bulloides; Globigerinacea; Globigerinidae; Invertebrata; isotope ratios; isotopes; Leg 189; magnesium; metals; Mg/Ca; microfossils; middle Miocene; Miocene; Neogene; O-18/O-16; ocean circulation; Ocean Drilling Program; orbital forcing; oxygen; paleo-oceanography; paleoclimatology; paleotemperature; Protista; Rotaliina; sea-surface temperature; Southern Ocean; stable isotopes; Tertiary;
.