Preprints
https://doi.org/10.5194/gmd-2018-172
https://doi.org/10.5194/gmd-2018-172
Submitted as: model evaluation paper
 | 
05 Sep 2018
Submitted as: model evaluation paper |  | 05 Sep 2018
Status: this preprint was under review for the journal GMD. A final paper is not foreseen.

Impact of model resolution on Holocene climate simulations of the Northern Hemisphere

Axel Wagner, Gerrit Lohmann, and Matthias Prange

Abstract. This study demonstrates the dependence of simulated surface air temperatures on variations in grid resolution and resolution-dependent orography in simulations of the Mid-Holocene. A set of Mid-Holocene sensitivity experiments is carried out with the atmospheric general circulation model ECHAM5 forced with sea surface temperature and sea ice fields from coupled simulations. Each experiment was performed in two resolution modes: low (~ 3.75°, 19 vertical levels) and high (~ 1.1°, 31 vertical levels). Results are compared to respective preindustrial runs. It is found that the large-scale temperature anomalies for the Mid-Holocene (compared to the preindustrial) are significantly different in the low- and high-resolution versions. For boreal winter, differences are related to circulation changes caused by the response to thermal forcing in conjunction with orographic resolution. For summer, shortwave cloud radiative forcing emerges as the predominant factor. In summary, the simulated Mid-Holocene temperature differences (low versus high resolution) reveal a response that regionally exceeds the Mid-Holocene to preindustrial modelled temperature anomalies, and show partly reversed signs across the same geographical regions. Our results imply that climate change simulations sensitively depend on the chosen grid resolutions.

This preprint has been withdrawn.

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.
Axel Wagner, Gerrit Lohmann, and Matthias Prange

Interactive discussion

Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

Interactive discussion

Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
Axel Wagner, Gerrit Lohmann, and Matthias Prange
Axel Wagner, Gerrit Lohmann, and Matthias Prange

Viewed

Total article views: 2,143 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
1,645 421 77 2,143 68 73
  • HTML: 1,645
  • PDF: 421
  • XML: 77
  • Total: 2,143
  • BibTeX: 68
  • EndNote: 73
Views and downloads (calculated since 05 Sep 2018)
Cumulative views and downloads (calculated since 05 Sep 2018)

Viewed (geographical distribution)

Total article views: 1,943 (including HTML, PDF, and XML) Thereof 1,937 with geography defined and 6 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 22 May 2024
Download

This preprint has been withdrawn.

Short summary
This study demonstrates the dependence of simulated surface air temperatures on variations in grid resolution and resolution-dependent orography in simulations of the Mid-Holocene. A set of Mid-Holocene sensitivity experiments is carried out. The simulated Mid-Holocene temperature differences (low versus high resolution) reveal a response that regionally exceeds the Mid-Holocene to preindustrial modelled temperature anomalies, and show partly reversed signs across the same geographical regions.