Air-sea bulk transfer coefficients in diabatic conditions |
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| Authors: | Junsei Kondo |
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| Institution: | (1) Geophysical Institute, Faculty of Science, Tohoku University, Sendai, Japan |
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| Abstract: | On the basis of recent data for the roughness Reynolds number of the sea surface, and using the Owen-Thomson theory on the transfers of heat and mass between a rough surface and the flow above it, the bulk transfer coefficients of the sea surface have been estimated. For a reference height of 10 m, the neutral-lapse transfer coefficient for water vapor is larger by only a few percent than that for sensible heat. When the wind speed at the 10-m height is u
10>3 m s–1, the coefficient for sensible heat C
H
is larger by about 10% than that for momentum C
D
. For u
10<5 m s–1, however, the value of C
D
exceeds the value of C
H
, and for u
10=15 m s–1 it is shown that C
H
 0.8C
D
. It may be also proposed that 103
C
D
=1.11 to 1.70, 103
C
E
=1.18 to 1.30, and 103
C
H
=1.15 to 1.26 for a range of u
10=4 to 20 m s–1. A plot of diabatic transfer coefficients versus wind speed is obtained by using a parameter of the sea-air temperature difference. For practical purposes, the coefficients are approximated by empirical formulae. |
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| Keywords: | |
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