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Influence of the boundary layer height on the global air-sea surface fluxes
Rosenstiel School of Marine and Atmospheric Science, University of Miami, USA. (AWEP)
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
2009 (English)In: Climate Dynamics, ISSN 0930-7575, E-ISSN 1432-0894, Vol. 33, no 1, 33-44 p.Article in journal (Refereed) Published
Abstract [en]

Results from large-eddy simulations and field measurements have previously shown that the velocity field is influenced by the boundary layer height, z (i) , during close to neutral, slightly unstable, atmospheric stratification. During such conditions the non-dimensional  wind profile, phi (m) , has been found to be a function of both z/L and  z (i) /L. At constant z/L, phi (m) decreases with decreasing boundary layer height. Since phi (m) is directly related to the parameterizations of the air-sea surface fluxes, these results will  have an influence when calculating the surface fluxes in weather and climate models. The global impact of this was estimated using re-analysis data from 1979 to 2001 and bulk parameterizations. The   results show that the sum of the global latent and sensible mean heat  fluxes increase by 0.77 W m(-2) or about 1% and the mean surface stress   increase by 1.4 mN m(-2) or 1.8% when including the effects of the boundary layer height in the parameterizations. However, some regions show a larger response. The greatest impact is found over the tropical   oceans between 30A degrees S and 30A degrees N. In this region the  boundary layer height influences the non-dimensional wind profile during extended periods of time. In the mid Indian Ocean this results in an increase of the mean annual heat fluxes by 2.0 W m(-2) and an increase of the mean annual surface stress by 2.6 mN m(-2).

Place, publisher, year, edition, pages
2009. Vol. 33, no 1, 33-44 p.
Keyword [en]
Boundary layer height, ERA-40, Latent heat flux, Momentum flux, Sensible heat flux
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:uu:diva-111328DOI: 10.1007/s00382-008-0411-9ISI: 000266266500003OAI: oai:DiVA.org:uu-111328DiVA: diva2:280499
Available from: 2009-12-10 Created: 2009-12-10 Last updated: 2017-12-12Bibliographically approved

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Sahlée, ErikSmedman, Ann-SofiHögström, Ulf

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