Untersuchungen zur räumlich verteilten Modellierung des fühlbaren Wärmestroms über Schnee in einem komplexen Gelände
Measurements as well as lot of General Circulation Models (GCM) simulations indicate an increase in air temperature especially for polar regions. In order to improve the quality of GCM predictions for these regions it is necessary to achieve a good parameterization of the energy exchange between atm...
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ftunivbasel:oai:edoc.unibas.ch:133 2023-05-15T12:59:54+02:00 Untersuchungen zur räumlich verteilten Modellierung des fühlbaren Wärmestroms über Schnee in einem komplexen Gelände Arck, Martin Scherer, Dieter Parlow, Eberhard Nagel, Peter 2004 application/pdf http://edoc.unibas.ch/diss/DissB_6916 https://edoc.unibas.ch/133/ https://edoc.unibas.ch/133/1/DissB_6916.pdf https://doi.org/10.5451/unibas-003396478 deu ger https://edoc.unibas.ch/133/1/DissB_6916.pdf Arck, Martin. Untersuchungen zur räumlich verteilten Modellierung des fühlbaren Wärmestroms über Schnee in einem komplexen Gelände. 2004, Doctoral Thesis, University of Basel, Faculty of Science. doi:10.5451/unibas-003396478 urn:urn:nbn:ch:bel-bau-diss69165 info:eu-repo/semantics/openAccess Thesis NonPeerReviewed 2004 ftunivbasel https://doi.org/10.5451/unibas-003396478 2023-03-05T06:45:26Z Measurements as well as lot of General Circulation Models (GCM) simulations indicate an increase in air temperature especially for polar regions. In order to improve the quality of GCM predictions for these regions it is necessary to achieve a good parameterization of the energy exchange between atmosphere and snow, because the high latitudes are snow covered for as many as nine months. During snowmelt period sensible heat flux plays an important role for energy input into the snow especially in periods of warm air advection, which are frequently accompanied by inversions. During the snowmelt periods in 1995 and 1998, Eddy-Covariance and profile measurements of wind speed and air temperature were carried out in the Kärkevagge, a valley in the Abisko Mountains in Swedish Lapland. Sensible heat flux was calculated by the Profile- and Bulk-method and compared to the directly-measured sensible heat flux. The Profile- and the Bulk-method gave reliable results as long as all data were measured within the surface layer and radiation errors for air-temperature data were small. The Bulk-method yielded better results than the profile method in periods with high values of upwelling shortwave radiation. All measurements conducted outside the surface layer, which was frequently shallow in 1998, were unusable for the Profile-method. Similarly, the Eddy-Covariance-method produced unreliable results if the instrument was operating outside the surface layer. In such a case, however, the Bulk-method produced at least a minimal estimate for the sensible heat flux. None of the methods yielded reasonable results for all meteorological conditions. These aspects should be noted when seeking new methods to improve the calculation of sensible heat flux not only in GCMs. The area distributions of air temperature and wind speed, which are not simply related to topographic parameters, were analyzed for the area of Kärkevagge, because sensible heat flux depends on the vertical temperature gradient and the turbulence in the surface layer. ... Thesis Abisko Lapland University of Basel: edoc Abisko ENVELOPE(18.829,18.829,68.349,68.349) Kärkevagge ENVELOPE(18.310,18.310,68.402,68.402) |
institution |
Open Polar |
collection |
University of Basel: edoc |
op_collection_id |
ftunivbasel |
language |
German |
description |
Measurements as well as lot of General Circulation Models (GCM) simulations indicate an increase in air temperature especially for polar regions. In order to improve the quality of GCM predictions for these regions it is necessary to achieve a good parameterization of the energy exchange between atmosphere and snow, because the high latitudes are snow covered for as many as nine months. During snowmelt period sensible heat flux plays an important role for energy input into the snow especially in periods of warm air advection, which are frequently accompanied by inversions. During the snowmelt periods in 1995 and 1998, Eddy-Covariance and profile measurements of wind speed and air temperature were carried out in the Kärkevagge, a valley in the Abisko Mountains in Swedish Lapland. Sensible heat flux was calculated by the Profile- and Bulk-method and compared to the directly-measured sensible heat flux. The Profile- and the Bulk-method gave reliable results as long as all data were measured within the surface layer and radiation errors for air-temperature data were small. The Bulk-method yielded better results than the profile method in periods with high values of upwelling shortwave radiation. All measurements conducted outside the surface layer, which was frequently shallow in 1998, were unusable for the Profile-method. Similarly, the Eddy-Covariance-method produced unreliable results if the instrument was operating outside the surface layer. In such a case, however, the Bulk-method produced at least a minimal estimate for the sensible heat flux. None of the methods yielded reasonable results for all meteorological conditions. These aspects should be noted when seeking new methods to improve the calculation of sensible heat flux not only in GCMs. The area distributions of air temperature and wind speed, which are not simply related to topographic parameters, were analyzed for the area of Kärkevagge, because sensible heat flux depends on the vertical temperature gradient and the turbulence in the surface layer. ... |
author2 |
Scherer, Dieter Parlow, Eberhard Nagel, Peter |
format |
Thesis |
author |
Arck, Martin |
spellingShingle |
Arck, Martin Untersuchungen zur räumlich verteilten Modellierung des fühlbaren Wärmestroms über Schnee in einem komplexen Gelände |
author_facet |
Arck, Martin |
author_sort |
Arck, Martin |
title |
Untersuchungen zur räumlich verteilten Modellierung des fühlbaren Wärmestroms über Schnee in einem komplexen Gelände |
title_short |
Untersuchungen zur räumlich verteilten Modellierung des fühlbaren Wärmestroms über Schnee in einem komplexen Gelände |
title_full |
Untersuchungen zur räumlich verteilten Modellierung des fühlbaren Wärmestroms über Schnee in einem komplexen Gelände |
title_fullStr |
Untersuchungen zur räumlich verteilten Modellierung des fühlbaren Wärmestroms über Schnee in einem komplexen Gelände |
title_full_unstemmed |
Untersuchungen zur räumlich verteilten Modellierung des fühlbaren Wärmestroms über Schnee in einem komplexen Gelände |
title_sort |
untersuchungen zur räumlich verteilten modellierung des fühlbaren wärmestroms über schnee in einem komplexen gelände |
publishDate |
2004 |
url |
http://edoc.unibas.ch/diss/DissB_6916 https://edoc.unibas.ch/133/ https://edoc.unibas.ch/133/1/DissB_6916.pdf https://doi.org/10.5451/unibas-003396478 |
long_lat |
ENVELOPE(18.829,18.829,68.349,68.349) ENVELOPE(18.310,18.310,68.402,68.402) |
geographic |
Abisko Kärkevagge |
geographic_facet |
Abisko Kärkevagge |
genre |
Abisko Lapland |
genre_facet |
Abisko Lapland |
op_relation |
https://edoc.unibas.ch/133/1/DissB_6916.pdf Arck, Martin. Untersuchungen zur räumlich verteilten Modellierung des fühlbaren Wärmestroms über Schnee in einem komplexen Gelände. 2004, Doctoral Thesis, University of Basel, Faculty of Science. doi:10.5451/unibas-003396478 urn:urn:nbn:ch:bel-bau-diss69165 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5451/unibas-003396478 |
_version_ |
1766130069748580352 |