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dc.contributor.authorVishnu, P.S.
dc.contributor.authorShaju, S.S.
dc.contributor.authorTiwari, Surya Prakash
dc.contributor.authorMenon, Nandini
dc.contributor.authorNashad, M.
dc.contributor.authorJoseph, C. Ajith
dc.contributor.authorRaman, Mini
dc.contributor.authorHatha, Mohamed
dc.contributor.authorPrabhakaran, M.P.
dc.contributor.authorMohandas, A.
dc.date.accessioned2017-12-17T13:48:01Z
dc.date.available2017-12-17T13:48:01Z
dc.date.issued2017-12-15
dc.identifier.citationVishnu PS, Shaju SS, Tiwari SP, Menon N, Nashad M, et al. (2018) Seasonal variability in bio-optical properties along the coastal waters off Cochin. International Journal of Applied Earth Observation and Geoinformation 66: 184–195. Available: http://dx.doi.org/10.1016/j.jag.2017.12.002.
dc.identifier.issn0303-2434
dc.identifier.doi10.1016/j.jag.2017.12.002
dc.identifier.urihttp://hdl.handle.net/10754/626390
dc.description.abstractStrong seasonal upwelling, downwelling, changes in current patterns and the volume of freshwater discharge from Cochin Estuary defines the coastal waters off Cochin. These coastal waters were investigated through monthly sampling efforts during March 2015 to February 2016 to study the seasonal and spatial variability in bio-optical properties for the four different seasons mainly Spring Inter Monsoon (SIM), South West Monsoon (SWM), Fall Inter Monsoon (FIM) and Winter Monsoon (WM). The Barmouth region is the meeting place where freshwater from Cochin Estuary directly enters to the sea through a single narrow outlet, was dominated by highly turbid waters during the entire period of study. Among the four seasons, chlorophyll a (Chl_a) concentration showed a high value during SWM, ranged from 2.90 to 11.66 mg m−3 with an average value of 6.56 ± 3.51 mg m−3. During SIM the distribution of coloured dissolved organic matter (CDOM) is controlled by decomposition of phytoplankton biomass and the river discharge, whereas during SWM the temporal distribution of CDOM is controlled only by river discharge. The highest value for CDOM spectral slope (SCDOM) was observed during SWM, ranged from 0.013 to 0.020 nm−1 with an average value of 0.015 ± 0.002 nm−1. During WM, the high SCDOM with lower aCDOM (443) indicates the photo-degradation affects the absorption characteristics of CDOM. The observed nonlinearity between Chl_a and the ratio of phytoplankton absorption aph (443)/aph (670) indicating the packaging effect and changes in the intercellular composition of pigments. During the study period, aph (670) was strongly correlated with Chl_a than aph (443), which explains the accessory pigment absorption dominating more than Chl_a in the blue part of the spectrum. Similarly, the results obtained from seasonal bio-optical data indicating that Chl_a significantly contributes light attenuation of the water column during SIM, whereas detritus (ad) significantly contributes light attenuation during SIM and WM. During the study period, the relative absorption of detritus materials dominates the relative absorption of phytoplankton and CDOM at 443, 555 and 670 nm wavelengths.
dc.description.sponsorshipThis study was funded by Space Application Centre (SAC), Indian Space Research Organization (ISRO), Ahmedabad. Second author thanks Partnership for Observation of Global Oceans (POGO) Secretariat, PML, UK for the fellowship during the study period. We thank the Department of Marine Biology, Microbiology and Biochemistry, Cochin University of Science and Technology (CUSAT) and Director, Nansen Environmental Research Centre (NERCI), India for the facilities provided. We are grateful to the staff of trawler Santa Cruz for the free help during the sampling period. We are thankful to Dominic Ricky Fernandez for the valuable assistance in current computation. We are grateful to the anonymous reviewers for their valuable comments, which helped to improve the structure and content of this paper.
dc.publisherElsevier BV
dc.relation.urlhttp://www.sciencedirect.com/science/article/pii/S0303243417302787
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in International Journal of Applied Earth Observation and Geoinformation. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in International Journal of Applied Earth Observation and Geoinformation, [, , (2017-12-15)] DOI: 10.1016/j.jag.2017.12.002 . © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectSouthwest monsoon
dc.subjectBio-optical properties
dc.subjectPigment packaging
dc.subjectPhytoplankton
dc.subjectCoastal waters off Cochin
dc.titleSeasonal variability in bio-optical properties along the coastal waters off Cochin
dc.typeArticle
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Division
dc.contributor.departmentRed Sea Research Center (RSRC)
dc.identifier.journalInternational Journal of Applied Earth Observation and Geoinformation
dc.eprint.versionPost-print
dc.contributor.institutionDepartment of Marine Biology, Microbiology and Biochemistry, School of Marine Sciences, Cochin University of Science and Technology (CUSAT), Cochin, 682016, India
dc.contributor.institutionNansen Environmental Research Centre (India) (NERCI), 6A Oxford Business Centre, Cochin, 682016, India
dc.contributor.institutionFishery Survey of India, Port Blair Base, Phoenix Bay Jetty, PB-744101, Andaman and Nicobar Islands, India
dc.contributor.institutionSpace Application Centre(SAC), Indian Space Research Organization (ISRO), Ahmedabad, 300015, India
dc.contributor.institutionDepartment of Fishery Hydrography, School of FRM&HT, KUFOS, Cochin, 682056, Kerala, India
dc.contributor.institutionNational Centre for Aquatic Animal Health, PB No. 2341, Cochin University of Science and Technology Cochin, 682 016, Kerala, India
kaust.personTiwari, Surya Prakash
dc.date.published-online2017-12-15
dc.date.published-print2018-04


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