Impact of surface characteristics on flow over a mesoscale mountain
Dynamical downscaling of atmospheric flow over Iceland has revealed that prominent downslope accelerated flows are not merely extreme events, but rather constitute a strong climatological signal over the larger ice caps. Ice caps are characterised by smooth and cold surfaces and both of these proper...
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crwiley:10.1002/qj.2302 2024-06-02T08:07:50+00:00 Impact of surface characteristics on flow over a mesoscale mountain Jonassen, Marius O. Ágústsson, Hálfdán Ólafsson, Haraldur 2014 http://dx.doi.org/10.1002/qj.2302 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fqj.2302 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/qj.2302 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Quarterly Journal of the Royal Meteorological Society volume 140, issue 684, page 2330-2341 ISSN 0035-9009 1477-870X journal-article 2014 crwiley https://doi.org/10.1002/qj.2302 2024-05-03T11:08:32Z Dynamical downscaling of atmospheric flow over Iceland has revealed that prominent downslope accelerated flows are not merely extreme events, but rather constitute a strong climatological signal over the larger ice caps. Ice caps are characterised by smooth and cold surfaces and both of these properties have previously been found to enhance downslope flows. In this article, we investigate the response of downslope accelerated flow over Hofsjökull in Central Iceland to an increase in surface roughness and a change in surface temperature corresponding to the effect of melting Hofsjökull's ice cap. We do so by exploring the flow over Hofsjökull for a summertime case by means of several numerical sensitivity experiments. In the experiments, we find a stronger downslope flow acceleration with than without the ice cap. While an increased surface roughness distinctly dampens the downslope flow, the effect of changing the surface temperature is minimal. This study is both of general relevance through its exploration of factors affecting downslope acceleration of stably stratified flow and also of interest because glaciers diminish rapidly in a changing climate. Article in Journal/Newspaper Hofsjökull Ice cap Iceland Wiley Online Library Quarterly Journal of the Royal Meteorological Society 140 684 2330 2341 |
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Wiley Online Library |
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English |
description |
Dynamical downscaling of atmospheric flow over Iceland has revealed that prominent downslope accelerated flows are not merely extreme events, but rather constitute a strong climatological signal over the larger ice caps. Ice caps are characterised by smooth and cold surfaces and both of these properties have previously been found to enhance downslope flows. In this article, we investigate the response of downslope accelerated flow over Hofsjökull in Central Iceland to an increase in surface roughness and a change in surface temperature corresponding to the effect of melting Hofsjökull's ice cap. We do so by exploring the flow over Hofsjökull for a summertime case by means of several numerical sensitivity experiments. In the experiments, we find a stronger downslope flow acceleration with than without the ice cap. While an increased surface roughness distinctly dampens the downslope flow, the effect of changing the surface temperature is minimal. This study is both of general relevance through its exploration of factors affecting downslope acceleration of stably stratified flow and also of interest because glaciers diminish rapidly in a changing climate. |
format |
Article in Journal/Newspaper |
author |
Jonassen, Marius O. Ágústsson, Hálfdán Ólafsson, Haraldur |
spellingShingle |
Jonassen, Marius O. Ágústsson, Hálfdán Ólafsson, Haraldur Impact of surface characteristics on flow over a mesoscale mountain |
author_facet |
Jonassen, Marius O. Ágústsson, Hálfdán Ólafsson, Haraldur |
author_sort |
Jonassen, Marius O. |
title |
Impact of surface characteristics on flow over a mesoscale mountain |
title_short |
Impact of surface characteristics on flow over a mesoscale mountain |
title_full |
Impact of surface characteristics on flow over a mesoscale mountain |
title_fullStr |
Impact of surface characteristics on flow over a mesoscale mountain |
title_full_unstemmed |
Impact of surface characteristics on flow over a mesoscale mountain |
title_sort |
impact of surface characteristics on flow over a mesoscale mountain |
publisher |
Wiley |
publishDate |
2014 |
url |
http://dx.doi.org/10.1002/qj.2302 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fqj.2302 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/qj.2302 |
genre |
Hofsjökull Ice cap Iceland |
genre_facet |
Hofsjökull Ice cap Iceland |
op_source |
Quarterly Journal of the Royal Meteorological Society volume 140, issue 684, page 2330-2341 ISSN 0035-9009 1477-870X |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/qj.2302 |
container_title |
Quarterly Journal of the Royal Meteorological Society |
container_volume |
140 |
container_issue |
684 |
container_start_page |
2330 |
op_container_end_page |
2341 |
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1800752973515587584 |