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Chronological, geochemical and sedimentological data from a lake sediment record extracted from Lake L15 (GPS Lake) on Potter Peninsula, South Shetland Islands in 2011

The dataset comprises of lake site photos, data and multiproxy data from Lake L15 (aka GPS Lake), a small lake basin at 62.24057 S, 58.6776 W on Potter Peninsula, King George Island, South Shetland Islands. The data have been used to constrain deglaciation and glacier dynamics on Potter Peninsula.

Data for the Lake L15 (GPS Lake) sediment record consist of downcore measurements of chronology, geochemistry, and sedimentology proxy data collected from the depocentre in November 2011.

Data collected in this study were funded by: Centro de Investigaciones en Ciencias de la Tierra (CICTERRA), the Direccion Nacional del Antartico/Instituto Antartico Argentino (DNA/IAA) in the framework of the Project PICTA, 2011 - 0102, IAA "Geomorfologia y Geologia Glaciar del Archipielago James Ross e Islas Shetland del Sur, Sector Norte de la Peninsula Antartica"; the Alfred Wegener Institute (AWI) research program Polar regions and Coasts in a changing Earth System (PACES II); IMCONet (FP7 IRSES, action no. 318718); 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. We thank the crews of the Argentine research station "Carlini" and the adjoined German Dallmann-Labor (AWI) Laboratory, the Uruguayan research station "Artigas", the Russian Bellingshausen Station, the Chinese Great Wall Station, Base Presidente Eduardo Frei Montalva, the Brazilian Navy Almirante Maximiano, the UK Navy HMS Endurance and NERC/BAS James Clark Ross for logistical support during the 2006, 2011, 2014 and 2015 field seasons.

Simple

Alternate title
Polar Data Centre (PDC) record GB/NERC/BAS/PDC/01685
Date (Publication)
2023-08-03
Identifier
http://www.antarctica.ac.uk/dms/metadata.php?id= / GB/NERC/BAS/PDC/01685
Custodian
  British Antarctic Survey
High Cross, Madingley Road , Cambridge , CB3 0ET , UK
+44 (0)1223 221400
Originator
  NERC EDS UK Polar Data Centre - Roberts, S., Pearson, E., Czalbowski, T., Davies, S., Grosjean, M., Arcusa, S., & Perren, B.
High Cross, Madingley , Cambridge , CB3 0ET , UK
+44 (0)1223 221400
Maintenance and update frequency
unknown Unknown
Keywords
  • NDGO0001
NERC OAI Harvesting
  • NERC_DDC
GCMD Parameter Valids
  • EARTH SCIENCE > Paleoclimate > Land Records > Radiocarbon
  • EARTH SCIENCE > Paleoclimate > Land Records > Stratigraphic Sequence
  • EARTH SCIENCE > Solid Earth > Geomorphology > Glacial Landforms/Processes
BAS Free-text keywords
  • Deglaciation
  • South Shetland Islands
  • geomorphological mapping
  • glacial readvance
  • radiocarbon dating
  • stratigraphy
Use limitation
Data released under Open Government Licence V3.0: http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/.
Access constraints
otherRestrictions Other restrictions
Other constraints
Data released under Open Government Licence V3.0: http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/.
Metadata language
EnglishEnglish
Topic category
  • Geoscientific information
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Begin date
2011-11-01
End date
2011-11-30
Reference system identifier
OGP / urn:ogc:def:crs:EPSG::4326
Distribution format
Distributor
  Polar Data Centre - British Antarctic Survey
+44 (0)1223 221400
Protocol
http
Name
GET DATA
Function
download Download
Hierarchy level
dataset Dataset

Domain consistency

Measure identification
INSPIRE / Conformity_001

Conformance result

Date
Explanation
See the referenced specification
Pass
No
Statement

Chronology

Pb-210 age estimates were derived using the constant rate of supply (CRS) method (Appleby and Oldfield, 1978) and incorporated into Bayesian age-depth models. The prerequisite for the CRS model was not fulfilled because the flux of Pb-210 has changed through time and is not constant, but Pb-210 data are consistent with the radiocarbon ages that show sediment between 6 and 6.5 cm dates to 620 plus-minus 80 a cal BP, and 3-3.5 cm and 0-0.5 cm depth were deposited in the ''post-bomb'' (post-1950 CE) era, most likely between -40 - -44 cal yr BP (1990-1994 CE) The Cs-137 data are inconsistent with the Pb-210 CRS age model and it is possible that the steep increase in Cs-137 in the upper 2 cm relates to a Cs-137 ''soil reservoir'', which is leaching Cs-137 into the lake from snow or lake-ice melting.

Geochemistry and Sedimentology

ITRAX-XRF Raw count per second (cps) data were analysed using the Q-spec software v8.6.0 (Cox Analytical), with MSE values minimised to optimise the fit of ''as measured'' spectra to a modelled spectrum. Data are presented as percentages of the Total Scatter Normalised ratio sum (percent sigma TSN or, more simply, percent TSN, which are equivalent to percentages of the cps sum, or percent cps) to account for downcore variations in count rate, density, water and organic content. Data less than mean minus two-sigma kcps (mainly due to gaps in the core) and greater than MSE plus two-sigma (representing a poor fit between measured to modelled spectra) were filtered before analysis. ''Noisy'' elements were eliminated by comparing cps and using percent TSN thresholds of more than 0.1 percent mean and more than 0.5 percent maximum, and by examining autocorrelation profiles for each element. Elements are presented as natural log (log n or Ln) ratios.

File identifier
GB_NERC_BAS_PDC_01685 XML
Metadata language
EnglishEnglish
Hierarchy level
dataset Dataset
Date stamp
2023-08-03
Metadata standard name
NERC profile of ISO19115:2003
Metadata standard version
1.0
Point of contact
  British Antarctic Survey
+44 (0)1223 221400
Dataset URI
http://www.antarctica.ac.uk/dms/metadata.php?id=GB/NERC/BAS/PDC/01685
 
 

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