THE HEAT SOURCE OF THE FOEHN
Abstract: Twelve years of upper air data and surface observations across Iceland are used to investigate the connection between the difference of surface air temperature upstream and downstream of the Icelandic highlands and several parameters of the airflow, such as precipitation, static stability...
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Croatian meteorological society; info@meteohmd.hr
2005
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fthrcak:oai:hrcak.srce.hr:64696 2023-05-15T16:47:36+02:00 THE HEAT SOURCE OF THE FOEHN Ólafsson, Haraldur; Háskóli Íslands (University of Iceland), Veðurstofa Íslands (Icelandic Meteorological Office) and Rannsóknastofa í veðurfræði (Institute for Meteorological Research); haraldur@vedur.is 2005-12-15 pdf http://hrcak.srce.hr/64696 http://hrcak.srce.hr/file/96968 en eng Croatian meteorological society; info@meteohmd.hr http://hrcak.srce.hr/64696 http://hrcak.srce.hr/file/96968 The papers of this Journal are free of charge for personal or educational use, with respect of copyright of authors and publisher. Croatian meteorological journal (nikolic@cirus.dhz.hr); Vol.40 No.40 foehn;latent heat;upstream precipitation;downstream heating;Nh/U inverse Froude number;Iceland text 2005 fthrcak 2012-10-27T15:58:16Z Abstract: Twelve years of upper air data and surface observations across Iceland are used to investigate the connection between the difference of surface air temperature upstream and downstream of the Icelandic highlands and several parameters of the airflow, such as precipitation, static stability and wind speed. The data does not support the well-known concept of the heat of the foehn being a result of latent heating. In the winter, warm air, descending from above the upstream boundary layer appears to be responsible for the downslope heating. There is little correlation between the upstream wind speed and the upstream-downstream temperature difference. This is explained by weak winds contributing to low level upstream blocking and descent from upper levels in the lee, while strong winds contribute directly to vertical mixing through mechanical turbulence. The annual cycle of temperature difference between the upstream and the downstream slopes indicates that in the summer, solar heating over the downstream slopes is responsible for a substantial part of the heating of the foehn. Text Iceland Hrčak - Portal of scientific journals of Croatia |
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Open Polar |
collection |
Hrčak - Portal of scientific journals of Croatia |
op_collection_id |
fthrcak |
language |
English |
topic |
foehn;latent heat;upstream precipitation;downstream heating;Nh/U inverse Froude number;Iceland |
spellingShingle |
foehn;latent heat;upstream precipitation;downstream heating;Nh/U inverse Froude number;Iceland Ólafsson, Haraldur; Háskóli Íslands (University of Iceland), Veðurstofa Íslands (Icelandic Meteorological Office) and Rannsóknastofa í veðurfræði (Institute for Meteorological Research); haraldur@vedur.is THE HEAT SOURCE OF THE FOEHN |
topic_facet |
foehn;latent heat;upstream precipitation;downstream heating;Nh/U inverse Froude number;Iceland |
description |
Abstract: Twelve years of upper air data and surface observations across Iceland are used to investigate the connection between the difference of surface air temperature upstream and downstream of the Icelandic highlands and several parameters of the airflow, such as precipitation, static stability and wind speed. The data does not support the well-known concept of the heat of the foehn being a result of latent heating. In the winter, warm air, descending from above the upstream boundary layer appears to be responsible for the downslope heating. There is little correlation between the upstream wind speed and the upstream-downstream temperature difference. This is explained by weak winds contributing to low level upstream blocking and descent from upper levels in the lee, while strong winds contribute directly to vertical mixing through mechanical turbulence. The annual cycle of temperature difference between the upstream and the downstream slopes indicates that in the summer, solar heating over the downstream slopes is responsible for a substantial part of the heating of the foehn. |
format |
Text |
author |
Ólafsson, Haraldur; Háskóli Íslands (University of Iceland), Veðurstofa Íslands (Icelandic Meteorological Office) and Rannsóknastofa í veðurfræði (Institute for Meteorological Research); haraldur@vedur.is |
author_facet |
Ólafsson, Haraldur; Háskóli Íslands (University of Iceland), Veðurstofa Íslands (Icelandic Meteorological Office) and Rannsóknastofa í veðurfræði (Institute for Meteorological Research); haraldur@vedur.is |
author_sort |
Ólafsson, Haraldur; Háskóli Íslands (University of Iceland), Veðurstofa Íslands (Icelandic Meteorological Office) and Rannsóknastofa í veðurfræði (Institute for Meteorological Research); haraldur@vedur.is |
title |
THE HEAT SOURCE OF THE FOEHN |
title_short |
THE HEAT SOURCE OF THE FOEHN |
title_full |
THE HEAT SOURCE OF THE FOEHN |
title_fullStr |
THE HEAT SOURCE OF THE FOEHN |
title_full_unstemmed |
THE HEAT SOURCE OF THE FOEHN |
title_sort |
heat source of the foehn |
publisher |
Croatian meteorological society; info@meteohmd.hr |
publishDate |
2005 |
url |
http://hrcak.srce.hr/64696 http://hrcak.srce.hr/file/96968 |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
Croatian meteorological journal (nikolic@cirus.dhz.hr); Vol.40 No.40 |
op_relation |
http://hrcak.srce.hr/64696 http://hrcak.srce.hr/file/96968 |
op_rights |
The papers of this Journal are free of charge for personal or educational use, with respect of copyright of authors and publisher. |
_version_ |
1766037686621044736 |