Diurnal variability of heat fluxes over the coastal waters off Visakhapatnam during post-monsoon and winter seasons

Abstract

<smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="City"><smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="place">

Diurnal variability of heat fluxes in the coastal waters of Visakhapatnam has been studied during post-monsoon (Oct, 2006) and winter (Jan-Feb, 2007) seasons utilizing the surface meteorological data and radiation measurements on-board CRV Sagar Sukti and mechanized boats. Estimated values of short and long wave radiation are well comparable with the measured values. Latent (Q_LH) and sensible (Q_SH) heat fluxes are computed from bulk aerodynamic method. Total enthalpy (i.e. Q_LH+Q_SH) was 50-200W/m²and 10-200W/m²(on diurnal scale), during post monsoon and winter seasons respectively. The net heat exchange (Q_N) was 137W/m² and 92W/m² under the above seasons. Daily mean values of Bowen Ratio (B) in the study region varied between 0.02 and 0.14,. A simple relationship [(B=0.057(Ts-Ta)^0.89; N = 20; r = 0.82; significant at > 99% level)] between Bowen’s ratio (B) and sea-air temperature difference has been proposed for unstable conditions. High correlation (r = 0.87) is found between the values of Q_LH estimated and obtained from the above relationship.

</smarttagtype></smarttagtype>