Swann, George E A; Pike, Jennifer; Snelling, Andrea M; Leng, Melanie J; Williams, Maria C (2013): Diatom isotope data from ODP Hole 178-1098A for the last deglaciation (12.2-12.8 ka BP) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.857259, Supplement to: Swann, GEA et al. (2013): Seasonally resolved diatom d18O records from the West Antarctic Peninsula over the last deglaciation. Earth and Planetary Science Letters, 364, 12-23, https://doi.org/10.1016/j.epsl.2012.12.016
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Abstract:
Understanding the response of the Antarctic ice sheets during the rapid climatic change that accompanied the last deglaciation has implications for establishing the susceptibility of these regions to future 21st Century warming. A unique diatom d18O record derived from a high-resolution deglacial seasonally laminated core section off the west Antarctic Peninsula (WAP) is presented here. By extracting and analysing single species samples from individual laminae, season-specific isotope records were separately generated to show changes in glacial discharge to the coastal margin during spring and summer months. As well as documenting significant intra-annual seasonal variability during the deglaciation, with increased discharge occurring in summer relative to spring, further intra-seasonal variations are apparent between individual taxa linked to the environment that individual diatom species live in. Whilst deglacial d18O are typically lower than those for the Holocene, indicating glacial discharge to the core site peaked at this time, inter-annual and inter-seasonal alternations in excess of 3 per mil suggest significant variability in the magnitude of these inputs. These deglacial variations in glacial discharge are considerably greater than those seen in the modern day water column and would have altered both the supply of oceanic warmth to the WAP as well as regional marine/atmospheric interactions. In constraining changes in glacial discharge over the last deglaciation, the records provide a future framework for investigating links between annually resolved records of glacial dynamics and ocean/climate variability along the WAP.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: -64.862060 * Longitude: -64.207850
Date/Time Start: 1996-03-12T15:30:00 * Date/Time End: 1998-03-12T23:15:00
Minimum Elevation: -1012.0 m * Maximum Elevation: -1012.0 m
Event(s):
178-1098A * Latitude: -64.862060 * Longitude: -64.207850 * Date/Time Start: 1996-03-12T15:30:00 * Date/Time End: 1998-03-12T23:15:00 * Elevation: -1012.0 m * Penetration: 45.9 m * Recovery: 45.78 m * Location: Drake Passage * Campaign: Leg178 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 7 cores; 45.9 m cored; 0 m drilled; 99.7 % recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Sample code/label | Sample label | Swann, George E A | DSDP/ODP/IODP sample designation | ||
| 2 | AGE | Age | ka BP | Swann, George E A | Geocode | |
| 3 | Lamina type | Lamina type | Swann, George E A | |||
| 4 | Diatoms, δ18O | Diatoms δ18O | ‰ SMOW | Swann, George E A | Mass spectrometer, Finnigan, MAT 253 | Spring d18O, CRS (Chaetoceros spp. resting spores) |
| 5 | Diatoms, δ18O | Diatoms δ18O | ‰ SMOW | Swann, George E A | Mass spectrometer, Finnigan, MAT 253 | Spring d18O, >10 µm fraction |
| 6 | Diatoms, δ18O | Diatoms δ18O | ‰ SMOW | Swann, George E A | Mass spectrometer, Finnigan, MAT 253 | Summer d18O, <15 µm fraction |
| 7 | Diatoms, δ18O | Diatoms δ18O | ‰ SMOW | Swann, George E A | Mass spectrometer, Finnigan, MAT 253 | Summer d18O, Thalassiosira antarctica resting spores |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
273 data points