Date (Creation)

2017-11-13

Date (Revision)

2017-11-13

Date (Publication)

2017-11-13

Date (released)

2017-11-13

Edition

None

Unique resource identifier

https://doi.org/10.5285/abbe3bbb-fb2b-416b-9ba2-12a0f914bac8

Codespace

doi

Unique resource identifier

GB/NERC/BAS/PDC/01041

Codespace

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

Other citation details

Please cite this item as: Goldberg, D., & Snow, K. (2017). Transient marine ice sheet response to temporally varying forcing (Version None) [Data set]. Polar Data Centre; British Antarctic Survey, Natural Environment Research Council; Cambridge, CB3 0ET, UK.. https://doi.org/10.5285/abbe3bbb-fb2b-416b-9ba2-12a0f914bac8

Credit

No credit.

Status

Completed

Point of contact

Organisation name	Individual name	Electronic mail address	Role
The Australian National University	Snow, Kate		Author
University of Edinburgh	Goldberg, Daniel		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

• EARTH SCIENCE > Cryosphere > Glaciers/Ice Sheets > Glacier Thickness/Ice Sheet Thickness

Theme

• coupled modelling

• cryosphere

• grounding line

• ice sheet variability

• ice shelves

GEMET - INSPIRE themes, version 1.0

• Elevation

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

Data released under Open Government Licence V3.0:

Unique resource identifier

url

Codespace

url

Association Type

Cross reference

Unique resource identifier

url

Codespace

url

Association Type

Cross reference

Spatial representation type

Text, table

Language

English

Character set

UTF8

Topic category

• Environment
• Oceans

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

Hierarchy level

Dataset

Statement

Methodology:

The data is 'raw' output of the Massachusetts Institute of Technology general circulation model (MITgcm; mitgcm.org). In each model run the diagnostics tool output yearly the temporal average of various diagnostics, including those provided, over the preceding year. The runs were done using version c66j, with the addition of the changes described in Snow K et al (2017, Geophys Research Letters) as well as Jordan J et al (2017, JGR-Oceans, doi:10.1002/2017JC013251). All relevant parameters given in the supplement of Snow K et al (2017, Geophys Research Letters).

The files are in Network Common Dataform (netcdf) format. A model output is provided for each experiment. There are 4 different types of experiment:

COUPLED: output from synchronously coupled runs

UNCOUPLED_SYM: ice model-only with a transversely symmetric depth-dependent parameterised melt as detailed in Snow K et al (2017, Geophys Research Letters)

UNCOUPLED_ASYM: ice model-only with a transversely asymmetric depth-dependent parameterised melt as detailed in Snow K et al (2017, Geophys Research Letters)

SLOW: ice model-only with a transversely symmetric depth-dependent parameterised melt as detailed in Snow K et al (2017, Geophys Research Letters), and elevated basal drag and in order to yield a slower-flowing ice sheet and shelf

A different file exists for each experiment with naming convention [EXPT TYPE]_[PERIOD_IN_YEARS]_YEAR.nc, with the addition of a single file for each expt type: [EXPT_TYPE]_CONST_FORCING.nc in which all external forcing is time-independent.

Dimensions of these files are:

X (orthogonal horizontal coordinate in meters)

Y (orthogonal horizontal coordinate in meters)

time (years)

NB: as detailed in Snow K et al (2017, Geophys Research Letters), the domain is idealised and an f-plane is used for Coriolis force, so the domain can be rotated without loss of generality.

Fields are:

double THICKNESS(time, Y, X) - the ice thickness (floating and grounded) in meters

double MELTRATE(time, Y, X) - the melt/freeze rate in meters ice per year (positive where melting)

double HEIGHT_ABOVE_FLOAT(time, Y, X) - the portion of the ice column greater than the maximum floating thickness (calculated as double MASK(time, Y, X)) - a file indicating the parts of the domain that actually represent the computational domain (ignores walls, etc). Equal to 1 where there is ice sheet or shelf, 0 where there is open ocean, and -1 outside of the physical domain.

One additional file is provided with dimensions X,Y only, detailing the bedrock elevation: BED.nc.

Data quality:

No "cleaning" was involved. The accuracy is subject to the ability of the model to approximate the differential equations solved, and the ability of the differential equations solved to represent reality, both of which issues have been discussed extensively in the literature (e.g. Durran et al (1999), Numerical Methods for Fluid Dynamics:with Applications in Geophysics, Springer).

Metadata

File identifier

abbe3bbb-fb2b-416b-9ba2-12a0f914bac8 XML

Metadata language

English

Character set

UTF8

Hierarchy level

Dataset

Hierarchy level name

dataset

Date stamp

2017-11-13

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