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Bulk Exchange Coefficient for Humidity at Sea during Unstable and Neutral Conditions: A Re-evaluation based on new Field Data
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Air and Water Science. Air and water sciences. (Meteorology)
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.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Air and Water Science.
2006 (English)Conference paper, Published paper (Other academic)
Abstract [en]

Analysis of the neutral exchange coefficient for latent heat, CEN, based on measurements from the Östergarnsholms site in the Baltic Sea has been made.

CEN was found to be constant with wind speed during periods with an air-sea temperature difference, ΔT, larger than 3 K. However, for smaller ΔT it was demonstrated that CEN increased dramatically with wind speed.

Through calculations with the spray-flux model of Andreas (2004) it was shown that spray-effects on the turbulent fluxes are relatively small. It was concluded that the increase of the exchange coefficients is due to dynamic effects.

With the aid of spectral analysis it was demonstrated that there is a link between the strong increase of the exchange coefficients and the turbulence structure. During high winds and small ΔT, surface layer scale eddies gain importance on the turbulent transport of latent and sensible heat, at the expense of the larger scale eddies.

The increase in CEN was found to be closely connected to a similar increase in the roughness length for humidity, z0q. It was demonstrated that this value deviated strongly from the z0q values calculated with surface renewal theory during high wind speeds and small ΔT. This result was taken as an indication of the failure of surface renewal theory for wind speeds above 10 ms-1. It is suggested that this is a result from the increasing importance of wave breaking with a possible link to changes in the turbulence structure.

References

Andreas, E. L, 2004: A bulk air-sea flux algorithm for high-wind, spray conditions, Version 2.0. Preprints, 13th Conf. on Interactions of the Sea and Atmosphere, Portland, ME, 9-13 August 2004, Amer. Meteor. Soc., CD-ROM P1.5, 8 pp.

Place, publisher, year, edition, pages
2006.
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:uu:diva-83220OAI: oai:DiVA.org:uu-83220DiVA: diva2:111127
Conference
14th Conference on Interaction of the Sea and Atmosphere, Atlanta, USA, January 27 - February 03, 2006
Available from: 2006-10-24 Created: 2006-10-24 Last updated: 2013-10-14Bibliographically approved

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http://ams.confex.com/ams/Annual2006/techprogram/paper_98075.htm

Authority records BETA

Sahlée, ErikSmedman, Ann-SofiHögström, UlfRutgersson, Anna

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