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 sim...
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ftcopernicus:oai:publications.copernicus.org:gmd76565 2023-05-15T13:55:28+02:00 Verification of the regional atmospheric model CCLM v5.0 with conventional data and lidar measurements in Antarctica Zentek, Rolf Heinemann, Günther 2020-04-06 application/pdf https://doi.org/10.5194/gmd-13-1809-2020 https://gmd.copernicus.org/articles/13/1809/2020/ eng eng doi:10.5194/gmd-13-1809-2020 https://gmd.copernicus.org/articles/13/1809/2020/ eISSN: 1991-9603 Text 2020 ftcopernicus https://doi.org/10.5194/gmd-13-1809-2020 2020-07-20T16:22:18Z 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. Text Antarc* Antarctic Antarctica Sea ice Weddell Sea Copernicus Publications: E-Journals Antarctic The Antarctic Weddell Weddell Sea Geoscientific Model Development 13 4 1809 1825 |
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Copernicus Publications: E-Journals |
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ftcopernicus |
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English |
description |
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. |
format |
Text |
author |
Zentek, Rolf Heinemann, Günther |
spellingShingle |
Zentek, Rolf Heinemann, Günther Verification of the regional atmospheric model CCLM v5.0 with conventional data and lidar measurements in Antarctica |
author_facet |
Zentek, Rolf Heinemann, Günther |
author_sort |
Zentek, Rolf |
title |
Verification of the regional atmospheric model CCLM v5.0 with conventional data and lidar measurements in Antarctica |
title_short |
Verification of the regional atmospheric model CCLM v5.0 with conventional data and lidar measurements in Antarctica |
title_full |
Verification of the regional atmospheric model CCLM v5.0 with conventional data and lidar measurements in Antarctica |
title_fullStr |
Verification of the regional atmospheric model CCLM v5.0 with conventional data and lidar measurements in Antarctica |
title_full_unstemmed |
Verification of the regional atmospheric model CCLM v5.0 with conventional data and lidar measurements in Antarctica |
title_sort |
verification of the regional atmospheric model cclm v5.0 with conventional data and lidar measurements in antarctica |
publishDate |
2020 |
url |
https://doi.org/10.5194/gmd-13-1809-2020 https://gmd.copernicus.org/articles/13/1809/2020/ |
geographic |
Antarctic The Antarctic Weddell Weddell Sea |
geographic_facet |
Antarctic The Antarctic Weddell Weddell Sea |
genre |
Antarc* Antarctic Antarctica Sea ice Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctica Sea ice Weddell Sea |
op_source |
eISSN: 1991-9603 |
op_relation |
doi:10.5194/gmd-13-1809-2020 https://gmd.copernicus.org/articles/13/1809/2020/ |
op_doi |
https://doi.org/10.5194/gmd-13-1809-2020 |
container_title |
Geoscientific Model Development |
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13 |
container_issue |
4 |
container_start_page |
1809 |
op_container_end_page |
1825 |
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1766262093664747520 |