Summary of Abstract Submission

Abstract Submission No. IO50-08-0001PresentationPoster

HUMIC FLUORESCENCE RATIO AS PROXY FOR REMOTE SENSING REFLECTANCE BAND RATIO (R(412)/R(443)) FOR CDOM ESTIMATION AND APPLICATION OF PARTICLE BACK SCATTERING FOR POLLUTION MONITORING IN THE WESTERN BAY OF BENGAL

SUDARSANA RAO PANDI*1, G. Chiranjeevulu1, Nittala S. Sarma*1, Rayaprolu Kiran1, N.V.H.K. Chari1, B.Srinivas1

1 ANDHRA UNIVERSITY, INDIA

ABSTRACT :

The apparent optical properties (AOPs: Rrs, Kd) of the Visakhapatnam coastal water were investigated for a year (April 2014 to March 2015) using hyper spectral underwater radiometer. Observations were made and samples collected and analysed for hydrochemistry at 10 sampling stations in the coastal region. The IOPs namely phytoplankton absorption coefficient (aph) and back scattering coefficients (bbp) were estimated using quasi analytical algorithm (QAA) applied to the Rrs spectra (Lee et al., 2002). The Excitation emission matrix (EEM) spectra of Colour dissolved organic matter (CDOM) were run. Their PARAFAC analysis extracted four fluorescent components, three humic like (Marine humic (M) and UV humic like (A) and one protein like i.e., Tryptopan (T). The QAA based estimation of IOPs agrees with the in situ values (measured with the help of Spectrophotometer) with regard to the mean values but has not in general captured the extreme distributions. Chl-a (MeOH) vs a*ph (in situ) and a*ph (QAA) showed significant power relationship characteristic for micro plankton. The Rrs spectra are of 3 end member types corresponding to clear water (CDOM), PP & NAP. Case 1 signature has seen in February and March of 2014 and 2015. The FDOM fluorophore ratios i.e., marine humic to UV- humic (M/A) and marine humic to visible humic (M/C) ratios have emerged as marker for the Rrs band ratio (R(412)/R(443)). The bbp(555) versus aph(443) plot has clearly mapped particulate pollution pluming from the Visakhapatnam harbour.