AN ANALYSIS OF MONTBLEX DATA ON HEAT AND MOMENTUM FLUX AT JODHPUR

Parameterization of sensible heat and momentum fluxes as inferred from an analysis of tower observations archived during MONTBLEX-90 at Jodh pur is proposed, both in terms of standard exchange coefficients C-H a nd C-D respectively and also according to free convection scaling. Bot h coefficients increase rapidly at low winds (the latter more strongly ) and with increasing instability. All the sensible heat flux data at Jodhpur (wind speed at 10m <(U)over bar (10)>, < 8ms(-1)) also obey fr ee convection scaling, with the flux proportional to the '4/3' power o f an appropriate temperature difference such as that between 1 and 30 m. Furthermore, for <(U)over bar (10)> < 4 ms(-1) the momentum flux di splays a linear dependence on wind speed.