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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/gmd-2019-141
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-2019-141
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: model evaluation paper 13 Aug 2019

Submitted as: model evaluation paper | 13 Aug 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).

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

Rolf Zentek and Günther Heinemann Rolf Zentek and Günther Heinemann
  • Department of Environmental Meteorology, University of Trier, Germany

Abstract. The non-hydrostatic 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. We prescribed 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, AWS over land and sea ice, 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. Differences in other regions were small. A comparison with measurements over the sea ice of the Weddell Sea by three AWS buoys for one 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 zero and a RMSE of 1–2 K for temperature and of 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 RMSE of ca. 2 m s−1. Overall CCLM shows a good representation of temperature and wind for the Weddell Sea region. These results encourage for further studies using CCLM data for the regional climate in the Antarctic at high resolutions and the study of atmosphere-ice-ocean interactions processes.

Rolf Zentek and Günther Heinemann
Interactive discussion
Status: open (until 08 Oct 2019)
Status: open (until 08 Oct 2019)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Rolf Zentek and Günther Heinemann
Data sets

CCLM simulation (Antarctica 2002–2016) – selected data R. Zentek and G. Heinemann https://doi.org/10.5281/zenodo.3355411

Model code and software

CCLM simulation (Antarctica 2002–2016) – model source codes and domain files R. Zentek and G. Heinemann https://doi.org/10.5281/zenodo.3355411

CCLM simulation (Antarctica 2002–2016) – scripts and configuration files R. Zentek and G. Heinemann https://doi.org/10.5281/zenodo.3339363

CCLM simulation (Antarctica 2002–2016) – analysis and plotting scripts R. Zentek and G. Heinemann https://doi.org/10.5281/zenodo.3361625

Rolf Zentek and Günther Heinemann
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Short summary
We used the climate model CCLM to simulate the Weddell Sea region with a resolutions of 15 and 5 km. By adjusting the turbulence parametrization a warm bias over the antarctic plateau was removed. For sea ice we found a temperature bias around 1 K and a wind speed bias of 1 m s−1. Comparisons of radio soundings showed a bias around zero and a RMSE of 1–2 K for temperature and of 3–4 m s−1 for wind speed. Comparison with wind Doppler Lidar yielded almost no bias and an RMSE of ca. 2 m s−1.
We used the climate model CCLM to simulate the Weddell Sea region with a resolutions of 15 and...
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