Vertical Fluxes of Momentum Sensible Heat and Water Vapour During the Air Mass Transformation Experiment (AMTEX) 1974

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Abstract
Vertical fluxes of momentum, sensible heat and water vapour were determined during the 1974 Air Mass Transformation Experiment at 3 sites using the eddy correlation and spectral density techniques. The paper describes these fluxes in terms of the bulk transfer coefficients during the cold air outbreak occurring between February 23rd and 28th. The evidence suggests an increase of the neutral drag coefficient (referred to 10m) with wind speed, to a value of 2×10-3 for wind speed approaching 15m s-1, whilst the ‘neutral’ heat and w.v. transfer coefficients remain approximately constant at 1.5×10.3 over the wind speed range 4-15m s-1. The mean sensible and latent heat fluxes for this 5 day period, based on data from Tarama-jima and Miyakojima were 11 mw cm-2 and 55 mw cm-2 (226 langleys day-1 and 1130 langleys day-1) respectively. The implied Bowen ratio of 0.20 is consistent with the measured sea surface temperature of 21°C, in agreement with the work of Priestley and Taylor (1972).

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