Turbulent fluxes of momentum and heat over land in the High-Arctic summer: the influence of observation techniques
Different observation techniques for atmospheric turbulent fluxes of momentum and sensible heat were tested in a High-Arctic valley in Svalbard during two consecutive summers (June–August in 2010 and 2011). The gradient method (GM) and the bulk method (BM) have been compared to the more direct eddy...
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Norwegian Polar Institute
2014
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ftdoajarticles:oai:doaj.org/article:00159afb8633496a81ad022e747ce94b 2023-05-15T13:11:31+02:00 Turbulent fluxes of momentum and heat over land in the High-Arctic summer: the influence of observation techniques Anna Sjöblom 2014-06-01T00:00:00Z https://doi.org/10.3402/polar.v33.21567 https://doaj.org/article/00159afb8633496a81ad022e747ce94b EN eng Norwegian Polar Institute http://www.polarresearch.net/index.php/polar/article/download/21567/pdf_1 https://doaj.org/toc/1751-8369 1751-8369 doi:10.3402/polar.v33.21567 https://doaj.org/article/00159afb8633496a81ad022e747ce94b Polar Research, Vol 33, Iss 0, Pp 1-17 (2014) Turbulent fluxes Svalbard Arctic observation techniques surface energy budget Environmental sciences GE1-350 Oceanography GC1-1581 article 2014 ftdoajarticles https://doi.org/10.3402/polar.v33.21567 2022-12-31T11:44:16Z Different observation techniques for atmospheric turbulent fluxes of momentum and sensible heat were tested in a High-Arctic valley in Svalbard during two consecutive summers (June–August in 2010 and 2011). The gradient method (GM) and the bulk method (BM) have been compared to the more direct eddy covariance method (ECM) in order to evaluate if relatively robust and cheap instrumentation with low power consumption can be used as a means to increase the number of observations, especially at remote locations where instruments need to be left unattended for extended periods. Such campaigns increase knowledge about the snow-free surface exchange processes, an area which is relatively little investigated compared to snow-covered ground. The GM agreed closely to the ECM, especially for momentum flux where the two methods agree within 5%. For sensible heat flux, the GM produces, on average, approximately 40% lower values for unstable stratification and 67% lower for stable stratification. However, this corresponds to only 20 and 12 W m−2, respectively. The BM, however, shows a greater scatter and larger differences for both parameters. In addition to testing these methods, radiation properties were measured and the surface albedo was found to increase through the summer, from approximately 0.1 to 0.2. The surface energy budget shows that the sensible heat flux is usually directed upwards for the whole summer, while the latent heat flux is upwards in June, but becomes downward in July and August. Article in Journal/Newspaper albedo Arctic Polar Research Svalbard Directory of Open Access Journals: DOAJ Articles Arctic Svalbard Polar Research 33 1 21567 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Turbulent fluxes Svalbard Arctic observation techniques surface energy budget Environmental sciences GE1-350 Oceanography GC1-1581 |
spellingShingle |
Turbulent fluxes Svalbard Arctic observation techniques surface energy budget Environmental sciences GE1-350 Oceanography GC1-1581 Anna Sjöblom Turbulent fluxes of momentum and heat over land in the High-Arctic summer: the influence of observation techniques |
topic_facet |
Turbulent fluxes Svalbard Arctic observation techniques surface energy budget Environmental sciences GE1-350 Oceanography GC1-1581 |
description |
Different observation techniques for atmospheric turbulent fluxes of momentum and sensible heat were tested in a High-Arctic valley in Svalbard during two consecutive summers (June–August in 2010 and 2011). The gradient method (GM) and the bulk method (BM) have been compared to the more direct eddy covariance method (ECM) in order to evaluate if relatively robust and cheap instrumentation with low power consumption can be used as a means to increase the number of observations, especially at remote locations where instruments need to be left unattended for extended periods. Such campaigns increase knowledge about the snow-free surface exchange processes, an area which is relatively little investigated compared to snow-covered ground. The GM agreed closely to the ECM, especially for momentum flux where the two methods agree within 5%. For sensible heat flux, the GM produces, on average, approximately 40% lower values for unstable stratification and 67% lower for stable stratification. However, this corresponds to only 20 and 12 W m−2, respectively. The BM, however, shows a greater scatter and larger differences for both parameters. In addition to testing these methods, radiation properties were measured and the surface albedo was found to increase through the summer, from approximately 0.1 to 0.2. The surface energy budget shows that the sensible heat flux is usually directed upwards for the whole summer, while the latent heat flux is upwards in June, but becomes downward in July and August. |
format |
Article in Journal/Newspaper |
author |
Anna Sjöblom |
author_facet |
Anna Sjöblom |
author_sort |
Anna Sjöblom |
title |
Turbulent fluxes of momentum and heat over land in the High-Arctic summer: the influence of observation techniques |
title_short |
Turbulent fluxes of momentum and heat over land in the High-Arctic summer: the influence of observation techniques |
title_full |
Turbulent fluxes of momentum and heat over land in the High-Arctic summer: the influence of observation techniques |
title_fullStr |
Turbulent fluxes of momentum and heat over land in the High-Arctic summer: the influence of observation techniques |
title_full_unstemmed |
Turbulent fluxes of momentum and heat over land in the High-Arctic summer: the influence of observation techniques |
title_sort |
turbulent fluxes of momentum and heat over land in the high-arctic summer: the influence of observation techniques |
publisher |
Norwegian Polar Institute |
publishDate |
2014 |
url |
https://doi.org/10.3402/polar.v33.21567 https://doaj.org/article/00159afb8633496a81ad022e747ce94b |
geographic |
Arctic Svalbard |
geographic_facet |
Arctic Svalbard |
genre |
albedo Arctic Polar Research Svalbard |
genre_facet |
albedo Arctic Polar Research Svalbard |
op_source |
Polar Research, Vol 33, Iss 0, Pp 1-17 (2014) |
op_relation |
http://www.polarresearch.net/index.php/polar/article/download/21567/pdf_1 https://doaj.org/toc/1751-8369 1751-8369 doi:10.3402/polar.v33.21567 https://doaj.org/article/00159afb8633496a81ad022e747ce94b |
op_doi |
https://doi.org/10.3402/polar.v33.21567 |
container_title |
Polar Research |
container_volume |
33 |
container_issue |
1 |
container_start_page |
21567 |
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1766247798714400768 |