10Be surface exposure age data from Mt Murphy, Marie Byrd Land, Antarctica

This dataset comprises 52 cosmogenic 10Be surface exposure ages and associated analytical data from quartz-bearing rocks from Mount Murphy and surrounding nunataks in Marie Byrd Land, Antarctica. The samples - glacial erratics and bedrock - were collected between 2006 and 2016 by Joanne Johnson, Stephen Roberts and James Smith (British Antarctic Survey), in order to determine timing and duration of ice sheet thinning in the Amundsen Sea sector of the West Antarctic Ice Sheet, specifically thinning of Pope Glacier. The data are published and interpreted in the following paper:

Johnson, J.S., Roberts, S.J., Rood, D.H., Pollard, D., Schaefer, J.M., Whitehouse, P.L., Ireland, L.C., Lamp, J.L., in review. Deglaciation of Pope Glacier implies widespread early Holocene ice sheet thinning in the Amundsen Sea sector of Antarctica. Earth & Planetary Science Letters. doi: xxxxx

This data forms part of the ANiSEED project ('Amundsen Sea Embayment Exposure Dating'), funded by the Natural Environment Research Council (grants NE/K012088/1 and NE/K011278/1).

Date (Creation): 2019-08-12

Date (Revision): 2019-08-12

Date (Publication): 2019-08-12

Date (released): 2019-08-12

Edition: 1.0

Unique resource identifier: https://doi.org/10.5285/63bbaf4f-fe53-45a8-b2b5-d41adcf3d35f

Codespace: doi

Unique resource identifier: GB/NERC/BAS/PDC/01225

Codespace: https://data.bas.ac.uk/

Unique resource identifier: NE/K012088/1

Codespace: award

Unique resource identifier: NE/K011278/1

Codespace: award

Other citation details: Please cite this item as: Johnson, J., Roberts, S., Rood, D., Schaefer, J., & Smith, J. (2019). 10Be surface exposure age data from Mt Murphy, Marie Byrd Land, Antarctica (Version 1.0) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/63bbaf4f-fe53-45a8-b2b5-d41adcf3d35f

Credit: No credit.

Status: Completed

Point of contact

Organisation name	Individual name	Electronic mail address	Role
British Antarctic Survey, Natural Environment Research Council, UK Research & Innovation	Johnson, Joanne S.		Author
British Antarctic Survey, Natural Environment Research Council, UK Research & Innovation	Roberts, Stephen J.		Author
Imperial College London	Rood, Dylan H.		Author
Lamont-Doherty Earth Observatory, Columbia University	Schaefer, Joerg M.		Author
British Antarctic Survey, Natural Environment Research Council, UK Research & Innovation	Smith, James A.		Author
NERC EDS UK Polar Data Centre		PDCServiceDesk@bas.ac.uk	Point of contact

Maintenance and update frequency: As needed

Maintenance note: Completed

Global Change Master Directory (GCMD) Science Keywords

Theme

10Be
Antarctica
Mount Murphy
Pope Glacier
exposure age

Place

central Amundsen Sea Embayment Antarctica
Pope Glacier Antarctica
Mount Murphy Antarctica
Turtle Rock Antarctica
Icefall Nunatak Antarctica
Dorrel Rock Antarctica
Notebook Cliffs Antarctica
Kay Peak Antarctica

GEMET - INSPIRE themes, version 1.0

Access constraints: Other restrictions

Other constraints: no limitations to public access

Access constraints: Other restrictions

Other constraints: no limitations

Use constraints: License

Other constraints: Open Government Licence v3.0

Use constraints: Other restrictions

Other constraints: This data is governed by the NERC Data Policy: https://www.ukri.org/who-we-are/nerc/our-policies-and-standards/nerc-data-policy/

Use constraints: Other restrictions

Other constraints: This data is governed by the NERC data policy and supplied under Open Government Licence v.3

Use constraints: Other restrictions

Other constraints: No restrictions apply.

Unique resource identifier: url

Codespace: url

Association Type: Cross reference

Unique resource identifier: url

Codespace: url

Association Type: Cross reference

Unique resource identifier: doi

Codespace: doi

Association Type: Cross reference

Unique resource identifier: url

Codespace: url

Association Type: dependency

Unique resource identifier: url

Codespace: url

Association Type: Cross reference

Spatial representation type: Text, table

Language: English

Character set: UTF8

Topic category

Climatology, meteorology, atmosphere
Geoscientific information

Begin date: 2013-01-01

End date: 2017-12-31

Vertical extent

Minimum value: 160.0

Maximum value: 893.0

Vertical CS

No information provided.

Vertical datum

No information provided.

Supplemental Information: It is recommended that careful attention be paid to the contents of any data, and that the author be contacted with any questions regarding appropriate use. If you find any errors or omissions, please report them to polardatacentre@bas.ac.uk.

Title: European Petroleum Survey Group (EPSG) Geodetic Parameter Registry

Date (Publication): 2008-11-12

Cited responsible party

Organisation name	Individual name	Electronic mail address	Role
European Petroleum Survey Group		EPSGadministrator@iogp.org	Publisher

Unique resource identifier: urn:ogc:def:crs:EPSG::3031

Version: 6.18.3

Distributor

Distributor contact

Organisation name	Individual name	Electronic mail address	Role
NERC EDS UK Polar Data Centre		PDCServiceDesk@bas.ac.uk	Distributor

Distributor format

Name	Version
text/csv

Units of distribution: bytes

Transfer size: 7168

OnLine resource

Protocol	Linkage	Name
WWW:LINK-1.0-http--link	https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=63bbaf4f-fe53-45a8-b2b5-d41adcf3d35f	Get Data

Hierarchy level: Dataset

Statement: Methodology:

The dataset comprises 52 exposure ages from 3 sets of samples. 3 samples were collected in 2006 by Joanne Johnson (using helicopter support from RV Polarstern cruise ANT-XXXIII-4), and are published in Johnson et al., 2008. They have been recalculated here for consistency. The remaining 49 exposure ages are from samples collected in 2010 (by James Smith using helicopter support from RV Polarstern cruise ANT-XXVII-3) and in 2015-16 by Joanne Johnson and Stephen Roberts (supported by NERC grants NE/K012088/1 and NE/K011278/1).

Samples from the surfaces of glacial erratics and bedrock were collected in the field using hand-held rock saw and chisel. These were then prepared at Lamont-Doherty Earth Observatory cosmogenic nuclide laboratory (USA) using procedures developed for high-sensitivity 10Be exposure dating. Analysis of 10Be/9Be ratios in each sample was undertaken by: PRIME lab, Purdue University, USA; the Center for Accelerator Mass Spectrometry (CAMS), Lawrence Livermore National Laboratory, USA; and Scottish Universities Environmental Research Centre (SUERC) AMS Laboratory. 10Be backgrounds were corrected with procedural blanks (a 9Be carrier-only sample that is processed alongside and identically to the samples), that ranged from < 1,000 to ~150,000 total 10Be atoms. Corrections were between <1 % to ~2.5 %. The 10Be exposure ages were then calculated using Version 3 of the online cosmogenic nuclide exposure age calculator hosted at https://hess.ess.washington.edu/. Topographic shielding was determined using the associated online geometric shielding calculator, v. 1.1. Zero erosion and a quartz density of 2.7 g cm-3 were assumed for all age calculations. The 10Be exposure ages in this dataset are reported using the LSDn scaling scheme of Lifton et al., 2014 (doi: 10.1016/j.epsl.2013.10.052), alongside the global 10Be production rate (PGLOBAL).

More details on sample processing and exposure age calculations are provided in the referenced publications.

Data collection:

Software: Version 3 of the online cosmogenic nuclide exposure age calculator hosted at https://hess.ess.washington.edu/.

Version 1.1. of the online geometric shielding calculator hosted at https://hess.ess.washington.edu/.

Metadata

File identifier: 63bbaf4f-fe53-45a8-b2b5-d41adcf3d35f XML

Metadata language: English

Character set: UTF8

Hierarchy level: Dataset

Hierarchy level name: dataset

Date stamp: 2019-08-12

Metadata standard name: ISO 19115 Geographic Information - Metadata

Metadata standard version: ISO 19115:2003(E)

Metadata author

Organisation name	Individual name	Electronic mail address	Role
NERC EDS UK Polar Data Centre		polardatacentre@bas.ac.uk	Point of contact

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