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Title: Diurnal variability of heat fluxes over the coastal waters off Visakhapatnam during post-monsoon and winter seasons
Authors: Ramu, Ch. Venkata
Bharathi, G
Sadhuram, Y
Prasad, K V S R
Keywords: Heat flux
Issue Date: Mar-2010
Publisher: CSIR
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<sub>LH</sub>) and sensible (Q<sub>SH</sub>) heat fluxes are computed from bulk aerodynamic method. Total enthalpy (i.e. Q<sub>LH</sub>+Q<sub>SH</sub>) was 50-200W/m<sup>2 </sup>and 10-200W/m<sup>2 </sup>(on diurnal scale), during post monsoon and winter seasons respectively. The net heat exchange (Q<sub>N</sub>) was 137W/m<sup>2</sup> and 92W/m<sup>2</sup> 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)<sup>0.89</sup>; 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<sub>LH</sub> estimated and obtained from the above relationship. </smarttagtype></smarttagtype>
Description: 128-135
ISSN: 0975-1033 (Online); 0379-5136 (Print)
Appears in Collections:IJMS Vol.39(1) [March 2010]

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