McKay, Robert M; Naish, Tim R; Carter, Lionel; Riesselman, Christina R; Dunbar, Robert G; Winter, Diane M; Sjunneskog, Charlotte; Sangiorgi, Francesca; Warren, Courtney E; Pagani, Mark; Schouten, Stefan; Willmott, Verónica; Levy, Richard H; DeConto, Robert M; Powell, Ross (2012): (Table S1) Diatom abundance according to ice cycles in ANDRILL AND1-1B drill core [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.816030, Supplement to: McKay, RM et al. (2012): Antarctic and Southern Ocean influences on Late Pliocene global cooling. Proceedings of the National Academy of Sciences of the United States of America, 109(17), 6423-6428, https://doi.org/10.1073/pnas.1112248109
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Abstract:
The influence of Antarctica and the Southern Ocean on Late Pliocene global climate reconstructions has remained ambiguous due to a lack of well-dated Antarctic-proximal, paleoenvironmental records. Here we present ice sheet, sea-surface temperature, and sea ice reconstructions from the ANDRILL AND-1B sediment core recovered from beneath the Ross Ice Shelf. We provide evidence for a major expansion of an ice sheet in the Ross Sea that began at ~3.3 Ma, followed by a coastal sea surface temperature cooling of ~2.5°C, a stepwise expansion of sea ice, and polynya-style deep mixing in the Ross Sea between 3.3 and 2.5 Ma. The intensification of Antarctic cooling resulted in strengthened westerly winds and invigorated ocean circulation. The associated northward migration of Southern Ocean fronts has been linked with reduced Atlantic Meridional Overturning Circulation by restricting surface water connectivity between the ocean basins, with implications for heat transport to the high latitudes of the North Atlantic. While our results do not exclude low-latitude mechanisms as drivers for Pliocene cooling, they indicate an additional role played by southern high-latitude cooling during development of the bipolar world.
Project(s):
Coverage:
Latitude: -77.889440 * Longitude: 167.089320
Date/Time Start: 2006-10-31T00:00:00 * Date/Time End: 2006-12-26T00:00:00
Minimum DEPTH, sediment/rock: 151.30 m * Maximum DEPTH, sediment/rock: 459.24 m
Event(s):
AND1-1B (AND-1B) * Latitude: -77.889440 * Longitude: 167.089320 * Date/Time Start: 2006-10-31T00:00:00 * Date/Time End: 2006-12-26T00:00:00 * Elevation: -917.0 m * Recovery: 1284.85 m * Campaign: MIS (McMurdo Ice Shelf) * Basis: McMurdo Station * Method/Device: Drilling/drill rig (DRILL) * Comment: Drilled through shelf ice, thickness of ice ~82 m
Comment:
A minimum of 300 valves were counted in each sample at a magnification of 600×. A magnification of 1,000× was used to confirm species identifications. For centric diatoms, a specimen was counted as 'one' if the central area and a portion of the margin could be identified, or if at least one-half of the valve was preserved. For pennate diatoms, each identifiable apex was counted as 'one-half', and the total count for each species was divided by two before relative abundance percentages were calculated. Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 2 | Cycles | Cycles | # | McKay, Robert M | ice cycle number | |
| 3 | Actinocyclus actinochilus | A. actinochilus | % | McKay, Robert M | Counting, diatoms | sea ice group |
| 4 | Fragilariopsis curta | F. curta | % | McKay, Robert M | Counting, diatoms | sea ice group |
| 5 | Fragilariopsis cylindrus | F. cylindrus | % | McKay, Robert M | Counting, diatoms | sea ice group |
| 6 | Fragilariopsis obliquecostata | F. obliquecostata | % | McKay, Robert M | Counting, diatoms | sea ice group |
| 7 | Fragilariopsis ritscheri | F. ritscheri | % | McKay, Robert M | Counting, diatoms | sea ice group |
| 8 | Fragilariopsis sublinearis | F. sublinearis | % | McKay, Robert M | Counting, diatoms | sea ice group |
| 9 | Porosira pseudodenticulata | P. pseudodenticulata | % | McKay, Robert M | Counting, diatoms | sea ice group |
| 10 | Stellarima microtrias | S. microtrias | % | McKay, Robert M | Counting, diatoms | sea ice group |
| 11 | Thalassiosira antarctica | T. antarctica | % | McKay, Robert M | Counting, diatoms | sea ice group |
| 12 | Thalassiosira tumida | T. tumida | % | McKay, Robert M | Counting, diatoms | sea ice group |
| 13 | Fragilariopsis kerguelensis | F. kerguelensis | % | McKay, Robert M | Counting, diatoms | polar open ocean and seasonal sea ice tolerant |
| 14 | Rhizosolenia spp. | Rhizosolenia spp. | % | McKay, Robert M | Counting, diatoms | pointed group; polar open ocean and seasonal sea ice tolerant |
| 15 | Rouxia antarctica | R. antarctica | % | McKay, Robert M | Counting, diatoms | polar open ocean and seasonal sea ice tolerant |
| 16 | Thalassiosira lentiginosa | T. lentiginosa | % | McKay, Robert M | Counting, diatoms | polar open ocean and seasonal sea ice tolerant |
| 17 | Thalassiosira oliverana | T. oliverana | % | McKay, Robert M | Counting, diatoms | polar open ocean and seasonal sea ice tolerant |
| 18 | Thalassiothrix antarctica | T. antarctica | % | McKay, Robert M | Counting, diatoms | polar open ocean and seasonal sea ice tolerant |
| 19 | Trichotoxon reinboldii | T. reinboldii | % | McKay, Robert M | Counting, diatoms | polar open ocean and seasonal sea ice tolerant |
| 20 | Stellarima stellaris | S. stellaris | % | McKay, Robert M | Counting, diatoms | subantarctic |
| 21 | Thalassionema nitzschioides | T. nitzschioides | % | McKay, Robert M | Counting, diatoms | subantarctic |
| 22 | Shionodiscus tetraoestrupii | S. tetraoestrupii | % | McKay, Robert M | Counting, diatoms | including S. oestrupii; subantarctic |
| 23 | Chaetoceros spp. | Chaetoceros spp. | % | McKay, Robert M | Counting, diatoms | |
| 24 | Diatoms indeterminata | Diatoms indet | % | McKay, Robert M | Counting, diatoms |
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Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
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