Shevenell, Amelia E; Kennett, James P; Lea, David W (2004): Sea surface temperature reconstruction for the middle Miocene Southern Ocean [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.772059, Supplement to: Shevenell, AE et al. (2004): Middle Miocene Southern Ocean cooling and Antarctic cryosphere expansion. Science, 305(5691), 1766-1770, https://doi.org/10.1126/science.1100061
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Abstract:
Magnesium/calcium data from Southern Ocean planktonic foraminifera demonstrate that high-latitude (~55°S) southwest Pacific sea surface temperatures (SSTs) cooled 6° to 7°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 ~60 thousand years, suggesting the involvement of additional feedbacks during this interval of inferred low-atmospheric partial pressure of CO2 (pCO2). Comparing SSTs and global carbon cycling proxies challenges the notion that episodic pCO2 drawdown drove this major Cenozoic climate transition. SST, salinity, and ice-volume trends suggest instead that orbitally paced ocean circulation changes altered meridional heat/vapor transport, triggering ice growth and global cooling.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -47.825340 * Median Longitude: 147.580775 * South-bound Latitude: -48.499950 * West-bound Longitude: 146.049800 * North-bound Latitude: -47.150730 * East-bound Longitude: 149.111750
Date/Time Start: 2000-03-31T08:30:00 * Date/Time End: 2000-04-14T21:00:00
Event(s):
189-1170A * Latitude: -47.150730 * Longitude: 146.049800 * Date/Time Start: 2000-03-31T08:30:00 * Date/Time End: 2000-04-03T05:45:00 * Elevation: -2704.7 m * Penetration: 464.3 m * Recovery: 379.87 m * Location: Indian Ocean * Campaign: Leg189 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 52 cores; 464.3 m cored; 0 m drilled; 81.8 % recovery
189-1171C * Latitude: -48.499950 * Longitude: 149.111750 * Date/Time Start: 2000-04-13T15:45:00 * Date/Time End: 2000-04-14T21:00:00 * Elevation: -2147.8 m * Penetration: 274.8 m * Recovery: 245.58 m * Location: South Pacific Ocean * Campaign: Leg189 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 31 core; 274.8 m cored; 0 m drilled; 89.4 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
Download Data
Datasets listed in this publication series
- Shevenell, AE; Kennett, JP; Lea, DW (2004): (Table S2) Mg/Ca ratios of Globigerina bulloides from ODP Hole 189-1170A. https://doi.org/10.1594/PANGAEA.772055
- Shevenell, AE; Kennett, JP; Lea, DW (2004): (Table S1) Mg/Ca and stable oxygen isotope ratios of Globigerina bulloides from ODP Hole 189-1171C. https://doi.org/10.1594/PANGAEA.772054