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Verification of the regional atmospheric model CCLM v5.0 with conventional data and lidar measurements in Antarctica

  • The nonhydrostatic regional climate model CCLM was used for a long-term hindcast run (2002–2016) for the Weddell Sea region with resolutions of 15 and 5 km and two different turbulence parametrizations. CCLM was nested in ERA-Interim data and used in forecast mode (suite of consecutive 30 h long simulations with 6 h spin-up). We prescribed the sea ice concentration from satellite data and used a thermodynamic sea ice model. The performance of the model was evaluated in terms of temperature and wind using data from Antarctic stations, automatic weather stations (AWSs), an operational forecast model and reanalyses data, and lidar wind profiles. For the reference run we found a warm bias for the near-surface temperature over the Antarctic Plateau. This bias was removed in the second run by adjusting the turbulence parametrization, which results in a more realistic representation of the surface inversion over the plateau but resulted in a negative bias for some coastal regions. A comparison with measurements over the sea ice of the Weddell Sea by three AWS buoys for 1 year showed small biases for temperature around ±1 K and for wind speed of 1 m s−1. Comparisons of radio soundings showed a model bias around 0 and a RMSE of 1–2 K for temperature and 3–4 m s−1 for wind speed. The comparison of CCLM simulations at resolutions down to 1 km with wind data from Doppler lidar measurements during December 2015 and January 2016 yielded almost no bias in wind speed and a RMSE of ca. 2 m s−1. Overall CCLM shows a good representation of temperature and wind for the Weddell Sea region. Based on these encouraging results, CCLM at high resolution will be used for the investigation of the regional climate in the Antarctic and atmosphere–ice–ocean interactions processes in a forthcoming study.

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Metadaten
Author:Rolf ZentekORCiD, Günther HeinemannORCiD
URN:urn:nbn:de:hbz:385-1-16500
DOI:https://doi.org/10.5194/gmd-13-1809-2020
Parent Title (English):Geoscientific Model Development
Publisher:Copernicus Publications
Place of publication:Göttingen
Document Type:Article
Language:English
Date of completion:2020/04/06
Date of publication:2020/04/06
Publishing institution:Universität Trier
Contributing corporation:The publication was funded by the Open Access Fund of Universität Trier and the German Research Foundation (DFG)
Release Date:2021/09/02
GND Keyword:Antarktis; Klima; Meteorologische Messung; Modell; Satellitenfernerkundung
Issue / no.:13/4
Number of pages:17
First page:1809
Last page:1825
Institutes:Fachbereich 6
Dewey Decimal Classification:9 Geschichte und Geografie / 91 Geografie, Reisen / 910 Geografie, Reisen
Licence (German):License LogoCC BY: Creative-Commons-Lizenz 4.0 International

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