A vertical propeller eddy-covariance method and its application to long-term monitoring of surface turbulent fluxes on the Greenland Ice Sheet
On the Greenland ice sheet, the sensible heat flux is the second largest source of energy for surface melt. Yet in atmospheric models, the surface turbulent heat fluxes are always indirectly estimated using a bulk turbulence parametrization, which needs to be constrained bylong-termandcontinuousobserv...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/408367 2023-12-03T10:23:19+01:00 A vertical propeller eddy-covariance method and its application to long-term monitoring of surface turbulent fluxes on the Greenland Ice Sheet Van Tiggelen, Maurice Smeets, Paul C. J. P. Reijmer, Carleen H. Van Den Broeke, Michiel R. Sub Dynamics Meteorology Marine and Atmospheric Research 2020-09 application/pdf https://dspace.library.uu.nl/handle/1874/408367 en eng 0006-8314 https://dspace.library.uu.nl/handle/1874/408367 info:eu-repo/semantics/OpenAccess Eddy covariance Greenland ice sheet Melt Roughness Sensible heat flux Article 2020 ftunivutrecht 2023-11-08T23:18:49Z On the Greenland ice sheet, the sensible heat flux is the second largest source of energy for surface melt. Yet in atmospheric models, the surface turbulent heat fluxes are always indirectly estimated using a bulk turbulence parametrization, which needs to be constrained bylong-termandcontinuousobservations.Unfortunately,suchobservationsarechallenging to obtain in remote polar environments, especially over ablating ice surfaces. We therefore test a classical eddy-covariance method, based on propeller anemometers and thermocouple measurements, to estimate the momentum and sensible heat fluxes on the Greenland ice sheet. To correct for the high-frequency attenuation, we experimentally derive the sensor frequency-response characteristics and evaluate the universal turbulence spectra on the ice sheet. We show that the corrected fluxes are accurate and that the sampling interval can be reduced to 4s to increase the system’s autonomy. To illustrate its potential, we apply the correction to one year of vertical propeller eddy-covariance measurements in the western ablation area of the ice sheet, and quantify the seasonal variability of the sensible heat flux and of the aerodynamic roughness length. 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 Roughness Sensible heat flux |
spellingShingle |
Eddy covariance Greenland ice sheet Melt Roughness Sensible heat flux Van Tiggelen, Maurice Smeets, Paul C. J. P. Reijmer, Carleen H. Van Den Broeke, Michiel R. A vertical propeller eddy-covariance method and its application to long-term monitoring of surface turbulent fluxes on the Greenland Ice Sheet |
topic_facet |
Eddy covariance Greenland ice sheet Melt Roughness Sensible heat flux |
description |
On the Greenland ice sheet, the sensible heat flux is the second largest source of energy for surface melt. Yet in atmospheric models, the surface turbulent heat fluxes are always indirectly estimated using a bulk turbulence parametrization, which needs to be constrained bylong-termandcontinuousobservations.Unfortunately,suchobservationsarechallenging to obtain in remote polar environments, especially over ablating ice surfaces. We therefore test a classical eddy-covariance method, based on propeller anemometers and thermocouple measurements, to estimate the momentum and sensible heat fluxes on the Greenland ice sheet. To correct for the high-frequency attenuation, we experimentally derive the sensor frequency-response characteristics and evaluate the universal turbulence spectra on the ice sheet. We show that the corrected fluxes are accurate and that the sampling interval can be reduced to 4s to increase the system’s autonomy. To illustrate its potential, we apply the correction to one year of vertical propeller eddy-covariance measurements in the western ablation area of the ice sheet, and quantify the seasonal variability of the sensible heat flux and of the aerodynamic roughness length. |
author2 |
Sub Dynamics Meteorology Marine and Atmospheric Research |
format |
Article in Journal/Newspaper |
author |
Van Tiggelen, Maurice Smeets, Paul C. J. P. Reijmer, Carleen H. Van Den Broeke, Michiel R. |
author_facet |
Van Tiggelen, Maurice Smeets, Paul C. J. P. Reijmer, Carleen H. Van Den Broeke, Michiel R. |
author_sort |
Van Tiggelen, Maurice |
title |
A vertical propeller eddy-covariance method and its application to long-term monitoring of surface turbulent fluxes on the Greenland Ice Sheet |
title_short |
A vertical propeller eddy-covariance method and its application to long-term monitoring of surface turbulent fluxes on the Greenland Ice Sheet |
title_full |
A vertical propeller eddy-covariance method and its application to long-term monitoring of surface turbulent fluxes on the Greenland Ice Sheet |
title_fullStr |
A vertical propeller eddy-covariance method and its application to long-term monitoring of surface turbulent fluxes on the Greenland Ice Sheet |
title_full_unstemmed |
A vertical propeller eddy-covariance method and its application to long-term monitoring of surface turbulent fluxes on the Greenland Ice Sheet |
title_sort |
vertical propeller eddy-covariance method and its application to long-term monitoring of surface turbulent fluxes on the greenland ice sheet |
publishDate |
2020 |
url |
https://dspace.library.uu.nl/handle/1874/408367 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_relation |
0006-8314 https://dspace.library.uu.nl/handle/1874/408367 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1784271421193584640 |