Author(s): David Schrder; Timo Vihma; Agathe Kerber; Burghard Brummer; Amelie Kirchgner
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Abstract: Turbulent surface fluxes were measured at heights between 9 and 35 m by the German Falcon research aircraft over the marginal ice zone (MIZ) of the northern Baltic Sea and the Fram Strait. Applying the bulk formulas and the stability functions to the measurements, the roughness lengths for momentum z, sensible heat z, and latent heat z were calculated. As mean values over a wide range of sea ice conditions we obtain: z =5·10 m, zT= 1 · 10 m, and z = 1 · 10 m. An average ratio of z /z ≈ 10 was observedover the range of 10 m< z < 10 m and differs from previously published resultsover compact sea ice (10 < z /z < 10). However, our z /z ratio approximatelyagrees with observations over heterogeneous land surfaces. Flux parameterizations based on commonly used roughness lengths ratios (z =z =z) overestimate the surface heat fluxes compared to our measurements by more than 100%.
Year: 2002