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Effects of integration time on in-water radiometric profiles

2018-03Journal article Open access
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dc.contributor.authorD'Alimonte, Davide
dc.contributor.authorZibordi, Giuseppe
dc.contributor.authorKajiyama, Tamito
dc.date.accessioned2018-12-07T14:53:37Z
dc.date.available2018-12-07T14:53:37Z
dc.date.issued2018-03
dc.description.abstractThis work investigates the effects of integration time on in-water downward irradiance E-d, upward irradiance E-u and upwelling radiance L-u profile data acquired with free-fall hyperspectral systems. Analyzed quantities are the subsurface value and the diffuse attenuation coefficient derived by applying linear and non-linear regression schemes. Case studies include oligotrophic waters (Case-1), as well as waters dominated by colored dissolved organic matter (CDOM) and non-algal particles (NAP). Assuming a 24-bit digitization, measurements resulting from the accumulation of photons over integration times varying between 8 and 2048ms are evaluated at depths corresponding to: 1) the beginning of each integration interval (FST); 2) the end of each integration interval (LST); 3) the averages of FST and LST values (AVG); and finally 4) the values weighted accounting for the diffuse attenuation coefficient of water (WGT). Statistical figures show that the effects of integration time can bias results well above 5% as a function of the depth definition. Results indicate the validity of the WGT depth definition and the fair applicability of the AVG one. Instead, both the FST and LST depths should not be adopted since they may introduce pronounced biases in E-u and L-u regression products for highly absorbing waters. Finally, the study reconfirms the relevance of combining multiple radiometric casts into a single profile to increase precision of regression products. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.
dc.identifier.doi10.1364/OE.26.005908
dc.identifier.issn1094-4087
dc.identifier.urihttp://hdl.handle.net/10400.1/11600
dc.language.isoeng
dc.peerreviewedyes
dc.publisherOptical Soc Amer
dc.subjectIrradiance Fluctuations
dc.subjectPolarized Reflectance
dc.subjectEuropean Seas
dc.subjectOcean
dc.subjectSurface
dc.subjectWaves
dc.subjectPressure
dc.subjectWind
dc.subjectSimulations
dc.subjectPerformance
dc.titleEffects of integration time on in-water radiometric profiles
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage5939
oaire.citation.issue5
oaire.citation.startPage5908
oaire.citation.titleOptics Express
oaire.citation.volume26
person.familyNameD'Alimonte
person.familyNameKajiyama
person.givenNameDavide
person.givenNameTamito
person.identifier.orcid0000-0001-7217-7057
person.identifier.orcid0000-0002-3148-9705
person.identifier.ridI-6531-2013
rcaap.rightsopenAccess
rcaap.typearticle
relation.isAuthorOfPublication8820679e-dc95-4070-b68f-b7bc79e4aff7
relation.isAuthorOfPublication648d8403-c7b7-4090-bb0d-fa63fe2c1f01
relation.isAuthorOfPublication.latestForDiscovery8820679e-dc95-4070-b68f-b7bc79e4aff7

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