Abstract:
The dataset comprises reconstructed temperature and tephra deposits age data from Yanou Lake, Fildes Peninsula, King George Island, South Shetland Islands. Data are calibrated to the 2020 radiocarbon calibration curves. The Antarctic and global glycerol dialkyl glycerol tetraether (GDGT) lipid biomarker temperature calibration are included. GDGT MSAT (mean summer air temperature) data was obtained by recalibrating the Pearson et al. (2011) global and Foster et al. (2016) Antarctic lake surface GDGT MSAT datasets. This dataset includes updates with new calibration of data originally published in Roberts et al. (2017).
These revisions were funded as part of the IMCONet (FP7 IRSES, action no. 318718) program led by Doris Abele (AWI); the Natural Environment Research Council (NERC/BAS-CGS Grant no.81); the NERC/BAS science programmes CACHE-PEP: Natural climate variability - extending the Americas palaeoclimate transect through the Antarctic Peninsula to the pole and GRADES-QWAD: Quaternary West Antarctic Deglaciations.
Keywords:
South Shetland islands, radiocarbon dating, stratigraphy, temperature reconstruction, tephra
Short doi: 10/jzr5
| Access Constraints: | No restrictions apply |
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| Use Constraints: | This data is governed by the NERC data policy http://www.nerc.ac.uk/research/sites/data/policy/ and supplied under Open Government Licence v.3 http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/. Use the following reference: Roberts, S., Pearson, E., Gabriel, I., Blockley, S., Foster, L.(2023). Reconstructed temperature and tephra deposit age data from Yanou Lake, Fildes Peninsula, South Shetland Islands, northern Antarctic Peninsula. (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/621cf434-1517-4b36-887d-4285315af695 |
| Creation Date: | 2023-02-21 |
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| Dataset Progress: | Complete |
| Dataset Language: | English |
| ISO Topic Categories: |
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| Parameters: |
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| Personnel: | |
| Name | UK Polar Data Centre |
| Role(s) | Metadata Author |
| Organisation | British Antarctic Survey |
| Name | Dr Stephen J Roberts |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Name | Emma J Pearson |
| Role(s) | Investigator |
| Organisation | Newcastle University |
| Name | Imogen Gabriel |
| Role(s) | Investigator |
| Organisation | Royal Holloway |
| Name | Simon Blockley |
| Role(s) | Investigator |
| Organisation | Royal Holloway |
| Name | Louise Foster |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Parent Dataset: | N/A |
| Reference: | Blaauw M and Christen JA. (2011) Flexible paleoclimate age-depth models using an autoregressive gamma process. Bayesian Analysis 6: 457-474. Heredia Barion, P., Roberts, S.J., Spiegel, C., et al. (2023). Holocene deglaciation and glacier readvances on the Fildes Peninsula, King George Island, NW Antarctic Peninsula. The Holocene. https://doi.org/10.1177/09596836231157059 Heredia Barion, P.A., Strelin, J.A., Roberts, S.J., et al. (2022). The impact of Holocene deglaciation and glacial dynamics on the landscapes and geomorphology of Potter Peninsula, King George Island (Isla 25 Mayo), NW Antarctic Peninsula. Frontiers in Earth Science https://doi.org/10.3389/feart.2022.1073075 Pearson EJ, Juggins S, Talbot HM, Weckstrom J, Rosen P, Ryves DB, et al. (2011) A lacustrine GDGT-temperature calibration from the Scandinavian Arctic to Antarctic: Renewed potential for the application of GDGT-paleothermometry in lakes. Geochimica et Cosmochimica Acta 75: 6225-6238. Roberts SJ, Monien P, Foster LC, Loftfield J, Hocking EP, Schnetger B, et al. (2017) Past penguin colony responses to explosive volcanism on the Antarctic Peninsula. Nature Communications 8: 14914. Foster LC, Pearson EJ, Juggins S, Hodgson DA, Saunders KM, Verleyen E, et al. (2016) Development of a regional glycerol dialkyl glycerol tetraether (GDGT)-temperature calibration for Antarctic and sub-Antarctic lakes. Earth and Planetary Science Letters 433: 370-379. |
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| Quality: | RMSE = 2.45±1.44 °C and 1.74±1.44 °C for global calibration temperature reconstructions and Antarctic/revised global+Antarctic calibration temperature reconstructions | |
| Lineage: | Glycerol dialkyl glycerol tetraether (GDGT) analysis of freshwater-brackish sediments from Yanou Lake dating to c. 6 ka was used to reconstruct mean summer air temperature (MSAT) and MSAT anomaly profiles (relative to the pre-industrial mean 1-0.25 cal. ka BP; RMSE = 2.45 degrees C; Pearson et al., 2011; Foster et al., 2016; Roberts et al., 2017). The published GDGT palaeotemperature reconstructions for Yanou Lake in Roberts et al. (2017) overestimated MSAT for data older than 2000 years due to a lack of data at the upper end of the Foster et al. (2016) Antarctic calibration dataset. Therefore, we constructed a new MSAT anomaly profile by combining GDGT-MSAT data from the global (Pearson et al., 2011) and Antarctic (Foster et al., 2016) GDGT calibration datasets and applied a new regression model based on the same compounds used in both (Juggins pers. comm). This produced a revised mean MSAT anomaly of 0.06 +/- 1.50 degrees C for the last 6,000 years of the Yanou Lake record, which is of a similar magnitude to the James Ross Island ice core mean annual temperature anomaly of 0.01 plus/minus 0.35 degrees C in the same period. Revised modelled ages for tephra deposits in the Yanou Lake record were produced using 2020 calibration curves and Bayesian age-depth modelling in BACON v. 2.5 in R (Blaauw and Christen, 2011). |
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| Temporal Coverage: | |
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| Start Date | 2007-11-01 |
| End Date | 2016-11-30 |
| Spatial Coverage: | |
| Latitude | |
| Southernmost | -62.22072 |
| Northernmost | -62.22072 |
| Longitude | |
| Westernmost | -58.95985 |
| Easternmost | -58.95985 |
| Altitude | |
| Min Altitude | N/A |
| Max Altitude | N/A |
| Depth | |
| Min Depth | N/A |
| Max Depth | N/A |
| Location: | |
| Location | South Shetland Islands |
| Detailed Location | Fildes Peninsula, South Shetland Islands |
| Distribution: | |
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| Distribution Media | N/A |
| Distribution Size | 15 files, 18 MB |
| Distribution Format | N/A |
| Fees | N/A |
| Data Storage: | Age_depth_model folder - input and output txt and csv files for age-depth modelling runs from the Yanou Lake record GDGT_data folder - containing a Yanou_GDGT_new_calibration.csv file containing original GDGT-MSAT temperature and temperature anomaly reconstructions for Yanou Lake from Roberts et al. (2017), labelled Foster2016, with revised GDGT-MSAT temperature and temperature anomaly reconstructions, labelled NewANT+GLOBAL. Data have been updated to the new Yanou Lake 2020 age-depth model Tephra data folder containing the following files YAN_M5_Sh20_tephra_chronostratigraphy.csv - revised age data for subaquatic moss and tephra deposits in the Yanou Lake record YAN_M5_Sh20_tephra_min_max_ages.csv - revised age data tephra deposits in the Yanou Lake record EPMA_db.csv - new compilation of major element tephra shard geochemistry from South America and the Antarctic used for data analysis and comparison tephra data from to the Yanou Lake record |