Observed and Parameterized Roughness Lengths for Momentum and Heat Over Rough Ice Surfaces
Turbulent heat fluxes, that is, the sensible heat flux and latent heat flux, are important sources/sinks of energy for surface melt over glaciers and ice sheets. Therefore, credible simulations of for example, future Greenland Ice Sheet mass loss need an accurate description of these fluxes. However...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/426907 2023-07-23T04:19:31+02:00 Observed and Parameterized Roughness Lengths for Momentum and Heat Over Rough Ice Surfaces van Tiggelen, Maurice Smeets, Paul Tijm - Reijmer, Carleen van den Broeke, Michiel Van As, Dirk Box, Jason E. Fausto, Robert S. Sub Dynamics Meteorology Marine and Atmospheric Research 2023-01-27 application/pdf https://dspace.library.uu.nl/handle/1874/426907 en eng 2169-897X https://dspace.library.uu.nl/handle/1874/426907 info:eu-repo/semantics/OpenAccess eddy covariance Greenland ice sheet melt events roughness sensible heat flux surface fluxes Geophysics Earth and Planetary Sciences (miscellaneous) Space and Planetary Science Atmospheric Science Article 2023 ftunivutrecht 2023-07-02T03:53:38Z Turbulent heat fluxes, that is, the sensible heat flux and latent heat flux, are important sources/sinks of energy for surface melt over glaciers and ice sheets. Therefore, credible simulations of for example, future Greenland Ice Sheet mass loss need an accurate description of these fluxes. However, the parameterization of surface turbulent heat fluxes in climate models requires knowledge about the surface roughness lengths for momentum, heat and moisture, which are currently either unknown or tuned to indirect observations. In this study we take advantage of a large data set of eddy covariance observations acquired during multiple years and at multiple sites over the Greenland Ice Sheet. These in-situ observations are used to develop an improved parameterization for the roughness length for momentum, and update the parameterization for the roughness lengths for heat and moisture over rough ice surfaces. The newly derived parameterizations are implemented in a surface energy balance model that is used to compute surface melt. Sensitivity experiments confirm the high sensitivity of surface melt to the chosen roughness length models. The new parameterization models the sensible heat flux to within 10 W m−2, and the cumulative ice ablation within 10% at three out of four sites. Two case studies demonstrate the important contribution of the turbulent heat fluxes to surface ablation. The presented roughness parameterizations can be implemented in climate models to improve the physical representation of surface roughness over rough snow and ice surfaces, which is expected to improve the modeled turbulent heat fluxes and thus surface melt. Article in Journal/Newspaper Greenland Ice Sheet Utrecht University Repository Greenland |
institution |
Open Polar |
collection |
Utrecht University Repository |
op_collection_id |
ftunivutrecht |
language |
English |
topic |
eddy covariance Greenland ice sheet melt events roughness sensible heat flux surface fluxes Geophysics Earth and Planetary Sciences (miscellaneous) Space and Planetary Science Atmospheric Science |
spellingShingle |
eddy covariance Greenland ice sheet melt events roughness sensible heat flux surface fluxes Geophysics Earth and Planetary Sciences (miscellaneous) Space and Planetary Science Atmospheric Science van Tiggelen, Maurice Smeets, Paul Tijm - Reijmer, Carleen van den Broeke, Michiel Van As, Dirk Box, Jason E. Fausto, Robert S. Observed and Parameterized Roughness Lengths for Momentum and Heat Over Rough Ice Surfaces |
topic_facet |
eddy covariance Greenland ice sheet melt events roughness sensible heat flux surface fluxes Geophysics Earth and Planetary Sciences (miscellaneous) Space and Planetary Science Atmospheric Science |
description |
Turbulent heat fluxes, that is, the sensible heat flux and latent heat flux, are important sources/sinks of energy for surface melt over glaciers and ice sheets. Therefore, credible simulations of for example, future Greenland Ice Sheet mass loss need an accurate description of these fluxes. However, the parameterization of surface turbulent heat fluxes in climate models requires knowledge about the surface roughness lengths for momentum, heat and moisture, which are currently either unknown or tuned to indirect observations. In this study we take advantage of a large data set of eddy covariance observations acquired during multiple years and at multiple sites over the Greenland Ice Sheet. These in-situ observations are used to develop an improved parameterization for the roughness length for momentum, and update the parameterization for the roughness lengths for heat and moisture over rough ice surfaces. The newly derived parameterizations are implemented in a surface energy balance model that is used to compute surface melt. Sensitivity experiments confirm the high sensitivity of surface melt to the chosen roughness length models. The new parameterization models the sensible heat flux to within 10 W m−2, and the cumulative ice ablation within 10% at three out of four sites. Two case studies demonstrate the important contribution of the turbulent heat fluxes to surface ablation. The presented roughness parameterizations can be implemented in climate models to improve the physical representation of surface roughness over rough snow and ice surfaces, which is expected to improve the modeled turbulent heat fluxes and thus surface melt. |
author2 |
Sub Dynamics Meteorology Marine and Atmospheric Research |
format |
Article in Journal/Newspaper |
author |
van Tiggelen, Maurice Smeets, Paul Tijm - Reijmer, Carleen van den Broeke, Michiel Van As, Dirk Box, Jason E. Fausto, Robert S. |
author_facet |
van Tiggelen, Maurice Smeets, Paul Tijm - Reijmer, Carleen van den Broeke, Michiel Van As, Dirk Box, Jason E. Fausto, Robert S. |
author_sort |
van Tiggelen, Maurice |
title |
Observed and Parameterized Roughness Lengths for Momentum and Heat Over Rough Ice Surfaces |
title_short |
Observed and Parameterized Roughness Lengths for Momentum and Heat Over Rough Ice Surfaces |
title_full |
Observed and Parameterized Roughness Lengths for Momentum and Heat Over Rough Ice Surfaces |
title_fullStr |
Observed and Parameterized Roughness Lengths for Momentum and Heat Over Rough Ice Surfaces |
title_full_unstemmed |
Observed and Parameterized Roughness Lengths for Momentum and Heat Over Rough Ice Surfaces |
title_sort |
observed and parameterized roughness lengths for momentum and heat over rough ice surfaces |
publishDate |
2023 |
url |
https://dspace.library.uu.nl/handle/1874/426907 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_relation |
2169-897X https://dspace.library.uu.nl/handle/1874/426907 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1772182706300387328 |