MetUM and HIRHAM5 simulations of summer near-surface temperatures over Antarctica from 1979 to 2019

High-resolution hindcasts (1979-2019) of summer climate over Antarctica using the UK Met Office Unified Model (MetUM) and HIRHAM5 were conducted at the British Antarctic Survey and Danish Meteorological Institute, respectively. The hindcasts are conducted for summer 1979-2018, i.e., from December 1979 to February 2019, for December, January, February (DJF). This dataset consists of near-surface temperature output from these hindcasts at a temporal resolution of every 3 hrs. The hindcasts are contributions to the COordinated Regional Downscaling EXperiment (CORDEX) project. Both models are run over Antarctic CORDEX domains, which encompass all of Antarctica and some of the surrounding ocean, at a horizontal grid spacing of around 12 km. The near-surface temperatures are used to estimate regional surface melt "potential" over Antarctic ice shelves as a function of summertime temperature extremes and identify regions of potentially enhanced "hotspots" of melt potential based on the occurrence (and magnitude) of various temperatures.

Funding was provided by the European Union's Horizon 2020 research and innovation framework programme under Grant agreement no. 101003590 (PolarRES)

Date (Creation): 2022-09-07

Date (Revision): 2022-09-07

Date (Publication): 2022-09-07

Date (released): 2022-09-07

Edition: 1.0

Unique resource identifier: https://doi.org/10.5285/05f8bd4b-97b1-43d0-a1c6-66aea7021aaf

Codespace: doi

Unique resource identifier: GB/NERC/BAS/PDC/01662

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

Other citation details: Please cite this item as: Orr, A., Boberg, F., & Phillips, T. (2022). MetUM and HIRHAM5 simulations of summer near-surface temperatures over Antarctica from 1979 to 2019 (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/05f8bd4b-97b1-43d0-a1c6-66aea7021aaf

Credit: No credit.

Status: Completed

Point of contact

Organisation name	Individual name	Electronic mail address	Role
British Antarctic Survey	Orr, Andrew		Author
Danish Meteorological Institute	Boberg, Fredrik		Author
British Antarctic Survey	Phillips, Tony		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

HIRHAM5
MetUM
Polar CORDEX
high-resolution atmospheric modelling
hindcast

Place

Antarctica

GEMET - INSPIRE themes, version 1.0

Atmospheric conditions

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 supplied under Open Government Licence v3.0

Use constraints: Other restrictions

Other constraints: None

Unique resource identifier: doi

Codespace: doi

Association Type: Cross reference

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

Climatology, meteorology, atmosphere

Begin date: 1979-12-01

End date: 2019-02-28

Vertical extent

Minimum value: 2.0

Maximum value: 2.0

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

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application/netcdf

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WWW:LINK-1.0-http--link	https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=05f8bd4b-97b1-43d0-a1c6-66aea7021aaf	Get Data

Units of distribution: bytes

Transfer size: 15032385536

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WWW:LINK-1.0-http--link	https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=05f8bd4b-97b1-43d0-a1c6-66aea7021aaf	Get Data

Hierarchy level: Dataset

Statement: Methodology:

The UK Met Office Unified Model (known as MetUM) uses the GA6 (Global Atmosphere 6.0; Walters et al., 2017) configuration of version 11.1, which is suitable for grid scales of 10 km or coarser. The HIRHAM5 model combines the physics of the ECHAM5 general circulation model and the hydrostatic dynamical core of the HIRLAM7 numerical weather prediction model (Christensen et al., 2007). The MetUM (HIRHAM5) uses 70 (31) vertical levels in the atmosphere. The ice mask used by both models is derived from Advanced Very High-Resolution Radiometer (AVHRR) data from the period 1992 to 1993 at a resolution of 1 km.

Both models are run over Antarctic CORDEX domains from December 1979 to February 2019 at grid spacing of around 12 km, with the MetUM (HIRHAM5) grid consisting of 392 x 504 (406 x 542) grid points. Initial and boundary conditions for both models are supplied by ERA-Interim reanalysis data. The MetUM hindcast uses a frequent re-initialization approach, consisting of twice-daily 24 hr forecasts. Output at T+12, T+15, T+18, and T+21 hr from each of the forecasts is concatenated together to form a seamless series of 3-hourly model outputs, with the earlier output discarded as spin-up. The HIRHAM5 hindcast uses a long-term continuous integration approach, with no nudging.

Christensen, O. B., M. Drews, J. H. Christensen, K. Dethloff, K. Ketelsen, I. Hebestadt, and A. Rinke, 2007: The HIRHAM regional climate model, Version 5 (beta), Danish Climate Centre, Danish Meteorological Institute, Danish Meteorological Institute, Technical Report. ISSN 1399-1388

Walters, D., I. Boutle, M. Brooks, T. Melvin, R. Stratton, S. Vosper, H. Wells, K. Williams, N. Wood, T. Allen, A. Bushell, D. Copsey, P. Earnshaw, J. Edwards, M. Gross, S. Hardiman, C. Harris, J. Heming, N. Klingaman, R. Levine, J. Manners, G. Martin, S. Milton, M. Mittermaier, C. Morcrette, T. Riddick, M. Roberts, C. Sanchez, P. Selwood, A. Stirling, C. Smith, D. Suri, W. Tennant, P. L. Vidale, J. Wilkinson, M. Willett, S. Woolnough, and P. Xavier, 2017: The Met Office Unified Model Global Atmosphere 6.0/6.1 and JULES Global Land 6.0/6.1 configurations. Geosci. Model. Dev., 10, 1487-1520, https://doi.org/10.5194/gmd-10-1487-2017.

Data quality:

Summer daily maximum temperatures derived from both the MetUM and HIRHAM5 hindcasts were compared in a statistical analysis with observations from twenty weather stations situated either on or close to Antarctic ice shelves. This comparison showed that the MetUM simulated temperatures were characterised by a) a cold bias for fifteen out of the twenty stations, which for ten of the stations was less than 1 K, b) a root-mean-square-error of 2-3 K, and c) a correlation from 0.62-0.91. The HIRHAM5 summer daily maximum temperatures typically have a larger cold bias, larger root-mean-square-error, and lower correlation than the MetUM results. The relatively good performance of the MetUM (and to a lesser extent HIRHAM5) suggests that daily maximum temperatures over Antarctic ice shelves derived from these model outputs are broadly representative of actual conditions.

Metadata

File identifier: 05f8bd4b-97b1-43d0-a1c6-66aea7021aaf XML

Metadata language: English

Character set: UTF8

Hierarchy level: Dataset

Hierarchy level name: dataset

Date stamp: 2022-09-07

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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