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Observations of summer turbulent surface fluxes in a High Arctic fjord
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
2014 (English)In: Quarterly Journal of the Royal Meteorological Society, ISSN 0035-9009, E-ISSN 1477-870X, Vol. 140, 666-675 p.Article in journal (Refereed) Published
Abstract [en]

The summer atmospheric boundary layer over a fjord in the High Arctic has beeninvestigated during three consecutive years (2008–2010). Measurements of turbulentsurface layer fluxes of momentum and sensible heat using a sonic anemometer and slowresponseinstruments were taken from a tower on the coast of Isfjorden, Svalbard, andanalysed for seasonal variability and differing fetch conditions. The results resembled theatmospheric boundary layer characteristics previously found for ice-free winter conditions.The momentum flux was usually directed downwards, but for low wind speeds there was apossible contribution of swell, giving an upward directed momentum flux. The cross-windcomponent of the momentum flux sometimes contributed significantly to the total flux. Thesensible heat flux was very dependent on the origin of air, whether it had a long over-waterfetch, or originated from land areas with or without glaciers. In addition to non-stationarityof the flow due to the influence of the fjord’s shape and its surrounding topography, lowwind speeds questioned the validity of the Monin–Obukhov similarity theory, whereas theover-water fetch and off-wind angle were of minor importance. Moreover, some results,especially the off-wind angle, were very sensitive to how the raw data were treated, inparticular which coordinate rotation method was employed, the double rotation or theplanar fit method.

Place, publisher, year, edition, pages
2014. Vol. 140, 666-675 p.
Keyword [en]
marine atmospheric boundary layer; surface layer; Svalbard; Monin–Obukhov similarity theory; sonic anemometer; topographic effects; coordinate rotation and tilt correction
National Category
Meteorology and Atmospheric Sciences
Research subject
URN: urn:nbn:se:uu:diva-240354DOI: 10.1002/qj.2167OAI: oai:DiVA.org:uu-240354DiVA: diva2:776354
Available from: 2015-01-07 Created: 2015-01-07 Last updated: 2015-01-07

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