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Wave flow simulations over Arctic leads
Stockholm University, Faculty of Science, Department of Meteorology .
Stockholm University, Faculty of Science, Department of Meteorology .
Department of Geophysics, Faculty of Science, Zagreb, Croatia.
2005 (English)In: Boundary-layer Meteorology, ISSN 0006-8314, E-ISSN 1573-1472, Vol. 117, no 2, 259-273 p.Article in journal (Refereed) Published
Abstract [en]

We investigate the flow over Arctic leads using a mesoscale numerical model, typical of both summer and winter, under idealised conditions. We find that Arctic leads may be the source of standing atmospheric internal gravity waves during both seasons. The summertime wave may be compared with the wave generated by a small ridge, though with the phase reversed. The mechanism for exciting the wave is found to be the internal boundary layer developing due to horizontal variations in surface temperature and roughness length. During the more exploratory wintertime simulations, with substantial temperature difference between the lead and the ice surface, we find that secondary circulations and intermittent wave-breaking may occur. The effects of the lead appear far downstream.

Place, publisher, year, edition, pages
2005. Vol. 117, no 2, 259-273 p.
Keyword [en]
Arctic, Gravity waves, Ice leads, Intermittent and elevated turbulence, Wave-breaking
National Category
Meteorology and Atmospheric Sciences
Research subject
Meteorology
Identifiers
URN: urn:nbn:se:su:diva-24078DOI: 10.1007/s10546-004-1427-2OAI: oai:DiVA.org:su-24078DiVA: diva2:196695
Note
Part of urn:nbn:se:su:diva-6585Available from: 2007-02-01 Created: 2007-02-01 Last updated: 2017-12-13Bibliographically approved
In thesis
1. On the Arctic Boundary Layer: From Turbulence to Climate
Open this publication in new window or tab >>On the Arctic Boundary Layer: From Turbulence to Climate
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The boundary layer is the part of the atmosphere that is in direct contact with the ground via turbulent motion. At mid-latitudes the boundary layer is usually one or a few kilometers deep, while in the Arctic it is much more shallow, typically a few hundred meters or less. The reason is that here the absolute temperature increases in the lowest kilometer, making the boundary layer semi-permanently stably stratified. The exchange of heat, momentum and tracers between the atmosphere, ocean and ground under stable stratification is discussed from an observational, modeling and climate-change point of view. A compilation of six observational datasets, ordered by the Richardson number (rather than the widely used Monin-Obukhov length) reveals new information about turbulence in the very stably stratified regime. An essentially new turbulence closure model, based on the total turbulent energy concept and these observational datasets, is developed and tested against large-eddy simulations with promising results. The role of mesoscale motion in the exchange between the atmosphere and surface is investigated both for observations and in idealized model simulations. Finally, it is found that the stably stratified boundary layer is more sensitive to external surface forcing than its neutral and convective counterparts. It is speculated that this could be part of the explanation for the observed Arctic amplification of climate change.

Place, publisher, year, edition, pages
Stockholm: Meteorologiska institutionen (MISU), 2007. 165 p.
Keyword
Atmospheric boundary layers, Turbulence, Stable stratification, Gravity waves, Mesoscale motion, Arctic climate
National Category
Meteorology and Atmospheric Sciences
Research subject
Atmospheric Sciences
Identifiers
urn:nbn:se:su:diva-6585 (URN)91-7155-373-8 (ISBN)
Public defence
2007-02-23, De Geersalen, Geovetenskapens hus, Svante Arrhenius väg 8 A, Stockholm, 10:00
Opponent
Supervisors
Available from: 2007-02-01 Created: 2007-02-01Bibliographically approved

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