{"refrec":{"BRefID":211483,"RR":"<b>Nechad, B.; Ruddick, K.</b> (2010). A model of diffuse attenuation of downwelling irradiance for ecosystem models, <b><i>in</i></b>: Frouin, R.J. <i>et al.</i> (Ed.) <i>Remote Sensing of the Coastal Ocean, Land, and Atmosphere Environment. Incheon, South Korea, October 13-14, 2010. Proceedings of SPIE, the International Society for Optical Engineering,</i> 7858. <a href=\"http://dx.doi.org/10.1117/12.872979\" target=\"_blank\">dx.doi.org/10.1117/12.872979</a>","BEntID":203405,"PublicFlag":1,"CheckedFlag":1,"wosflag":0,"vabbflag":null,"RefStringPartII":", <b><i>in</i></b>: Frouin, R.J. <i>et al.</i> <i>Remote Sensing of the Coastal Ocean, Land, and Atmosphere Environment. Incheon, South Korea, October 13-14, 2010. Proceedings of SPIE, the International Society for Optical Engineering,</i> 7858. <a href=\"https://dx.doi.org/10.1117/12.872979\" target=\"_blank\">https://dx.doi.org/10.1117/12.872979</a>","DocTypID":17,"DocType":"Book chapters","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Nechad, B.; Ruddick, K.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Nechad, B.; Ruddick, K.","Englishabstract":"Estimation of the underwater attenuation of light is important to ecosystem modellers, who require information on Photosynthetically Available Radiation (<i>PAR</i>), and on the euphotic depth for calculation of primary production. Characterisation of these processes can be achieved by determining the diffuse attenuation coefficient of <i>PAR, KPAR</i>. A review of bio-optical models of the spectral diffuse attenuation coefficient for downwelling irradiance, <i>K<sub>d</sub></i>, is presented and stresses the necessity for a better knowledge and parameterization of these coefficients. <br>In the second part of this work, radiative transfer simulations were carried out to model <i>K<sub>dZ1%</sub></i> the spectral diffuse attenuation of downwelling irradiance averaged over the euphotic depth <i>Z<sub>1%</sub></i> (depth where the downwelling irradiance is 1% of its surface value). This model takes into account the effects of varying sun zenith angle and cloud cover and needs absorption and backscattering coefficients (the inherent optical properties, IOPs) as input. It provides average and maximum relative errors of 1% and 5% respectively, for sun zenith angles [0°-50°] and of 1.7% and 12% respectively at higher sun zenith angles. A relationship was established between <i>K<sub>dZ1%</sub></i> at a single wavelength (590nm) and <i>KPAR</i> at <i>Z<sub>PAR1%</sub></i> (where <i>PAR</i> is 1% of its value at the surface) which allows for a direct expression of <i>KPAR<sub>ZPAR1%</sub></i> in terms of inherent optical properties, sun angle and cloudiness. This model provides estimates of <i>KPAR</i> within 25% (respectively 40%) relative errors respectively with a mean relative error less than 7% (respectively 9%) for sun zenith angles ranging from 0° to 50° (respectively higher than 50°). A similar method is applied to derive a model for the diffuse attenuation of photosynthetically usable radiation, <i>KPUR<sub>ZPUR1%</sub></i>, with similar performance.","AbstractOtherLang":null,"BibLvlCode":"AMS","StandardTitle":"A model of diffuse attenuation of downwelling irradiance for ecosystem models","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2024-12-10 01:32:52.928458","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"diffuse attenuation coefficient of downwelling irradiance; average","OtherDescriptors":null,"Notes":null,"AnaPub":2010,"MonPub":null,"DateUpdate":"2012-01-30","DateCreate":"2011-12-22","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000287653300010","VABBcode":null,"OpenAcc":0,"DOI":"10.1117/12.872979"},"refs":null,"anarec":{"AnaID":211483,"PubliDate":2010,"Pagination":null,"XtraPublOfAnaID":null,"ISBN":"978-0-8194-8388-1","Volume":"7858","Issue":null,"BRefMon":210459,"BRefMonRR":"<b>Frouin, R.J. <i>et al.</i> (Ed.)</b> (2010). Remote Sensing of the Coastal Ocean, Land, and Atmosphere Environment. Incheon, South Korea, October 13-14, 2010. <i>Proceedings of SPIE, the International Society for Optical Engineering</i>, 7858. SPIE: Bellingham. ISBN 978-0-8194-8388-1. 308 pp.","BRefXtra":null,"BRefXtraRR":null,"SerBRefID":96927,"SerRR":"Proceedings of SPIE, the International Society for Optical Engineering. SPIE: Bellingham, WA.  ISSN 0277-786X; e-ISSN 1996-756X","StandardTitleSer":"Proceedings of SPIE, the International Society for Optical Engineering","ISSN":"0277-786X","AbbrevSer":"Proc. SPIE Int. Soc. Opt. Eng.","StandardTitleMon":"Remote Sensing of the Coastal Ocean, Land, and Atmosphere Environment. Incheon, South Korea, October 13-14, 2010","StartPage":null,"Pages":null,"ToPubliDate":null,"BRefBibLvlCode":"MS","SerNotes":null,"AutString":"Frouin, R.J. <i>et al.</i> (Ed.)"},"monrec":null,"serrec":null,"relations":null,"relationsRev":null,"addrec":null,"othpubs":null,"ownerships":null,"authors":[{"AutName":"Nechad","Firstname":"Bouchra","Initials":"B.","Affiliation":"Royal Belgian Inst Nat Sci RBINS, Management Unit N Sea Math Models MUMM, B-1200 Brussels, Belgium.","Discriminator":null,"CorporateFlag":0,"BEntID":203405,"AutID":141134,"OrderNr":1,"DegrID":null,"EditorFlag":0,"CorrespFlag":0,"IllustratorFlag":0,"ReviserFlag":0,"TranslatorFlag":0,"InsAcronym":"BMM","InsFSN":"Koninklijk Belgisch Instituut voor Natuurwetenschappen; Operationele Directie Natuurlijk Milieu; Beheerseenheid Mathematisch Model Noordzee en Schelde-estuarium","ORCID":null,"PersID":2781,"InsID":4691},{"AutName":"Ruddick","Firstname":"Kevin","Initials":"K.","Affiliation":"Royal Belgian Inst Nat Sci RBINS, Management Unit N Sea Math Models MUMM, B-1200 Brussels, Belgium.","Discriminator":null,"CorporateFlag":0,"BEntID":203405,"AutID":141135,"OrderNr":2,"DegrID":null,"EditorFlag":0,"CorrespFlag":0,"IllustratorFlag":0,"ReviserFlag":0,"TranslatorFlag":0,"InsAcronym":"BMM","InsFSN":"Koninklijk Belgisch Instituut voor Natuurwetenschappen; Operationele Directie Natuurlijk Milieu; Beheerseenheid Mathematisch Model Noordzee en Schelde-estuarium","ORCID":null,"PersID":2785,"InsID":4691}],"mapdetails":null,"datasets":null,"monographs":null,"monparts":null,"serparts":null,"BEntOpen":null,"BEntPrivate":null,"availability":[{"BInstID":231481,"LibID":36,"BRefID":211483,"EmbargoDate":null,"FullEmbargoDate":null,"PhysMedID":16,"hasOCRd":1,"ShelfLocCode":"231481","RFID":null,"PaidValue":null,"Medium":"Server","Description":null,"Acronym":"VLIZ","Library":"Vlaams Instituut voor de Zee","DutchTerm":"Open Marien Archief","URL":null,"ClassifID":235,"Classification":"Open Marine Archive","ReqLink":null,"ClassifTypID":5,"URLLocation":"https://www.vliz.be/imisdocs/publications/","SubDir":0,"InternalReq":0,"LoggedInReq":0,"Disclaimer":"Disclaimer_OMA","DutchDisclaimer":null,"FileFormat":".pdf","FileDescr":"pdf","InsPub":1,"InsID":36,"FileFormID":6,"LendableFlag":1,"PublicFlag":1,"orderLib":"A","Notes":null,"AccConID":null,"AccessConstraint":null,"LicURL":null}],"litstyles":null,"thespers":null,"arch2discl":null,"SERpubls":null,"MONpubls":[{"PublName":"SPIE","Place":"Bellingham"}],"pictures":[],"thestermsPath":null,"thestermsASFA":null,"taxtermsASFA":null,"geotermsASFA":null,"collections":[{"Collection":"OMA - Open Marien Archief","ShortName":"OMA"}],"conf":null,"proj":[{"ProID":2612,"Acronym":"BELCOLOUR-2","ProStandardTitle":"BELCOLOUR-2 : Optical remote sensing of marine, coastal and inland waters","BYear":2006,"BMonth":12,"EYear":2011,"EMonth":11,"FP7Code":null,"RelID":null,"Relation":null,"DutchTerm":null}],"Physdatasets":null,"spcols":{"222":{"SpName":"BMB - Belgische Mariene Bibliografie","SpColID":222,"ParSpColID":null,"TopParID":null,"ShortName":"BMB","URLLocation":null,"LibID":36,"OpenRepoFlag":null,"SpTypID":null,"TopParIDNotWebsite":null,"SpColPath":"BMB"},"221":{"SpName":"OMA - Open Marien Archief","SpColID":221,"ParSpColID":null,"TopParID":null,"ShortName":"OMA","URLLocation":null,"LibID":36,"OpenRepoFlag":1,"SpTypID":null,"TopParIDNotWebsite":null,"SpColPath":"OMA"}},"doi":null,"publs":null,"serparttypes":null,"monauthors":[{"AutName":"Frouin","Initials":"R.J.","CorporateFlag":0,"BEntID":202383,"AutID":64847,"OrderNr":1,"DegrID":null,"EditorFlag":1,"CorrespFlag":0,"IllustratorFlag":0,"ReviserFlag":0,"TranslatorFlag":0,"AutStrTrunc":"Frouin, R.J. <i>et al.</i> (Ed.)"},{"AutName":"Rhyong Yoo","Initials":"H.","CorporateFlag":0,"BEntID":202383,"AutID":137707,"OrderNr":2,"DegrID":null,"EditorFlag":1,"CorrespFlag":0,"IllustratorFlag":0,"ReviserFlag":0,"TranslatorFlag":0,"AutStrTrunc":"Frouin, R.J. <i>et al.</i> (Ed.)"},{"AutName":"Won","Initials":"J.-S.","CorporateFlag":0,"BEntID":202383,"AutID":137708,"OrderNr":3,"DegrID":null,"EditorFlag":1,"CorrespFlag":0,"IllustratorFlag":0,"ReviserFlag":0,"TranslatorFlag":0,"AutStrTrunc":"Frouin, R.J. <i>et al.</i> (Ed.)"}],"MParts":null,"SParts":null,"hLibs":null,"langs":[{"BEntID":203405,"AbstractFlag":0,"LangID":15,"LangCode":"en","Lang":"English","DutchTerm":"Engels","LangCodeExtended":"eng"}],"urls":[{"URL":"https://dx.doi.org/10.1117/12.872979","externalID":"10.1117/12.872979","URLTypeCode":"DOI","URLID":20357,"URLTypID":13,"URLType":"DOI","URLPrefix":"http://dx.doi.org/"}],"thesterms":null,"taxterms":null,"geoterms":null,"othterms":null,"asfacodes":null,"asfa2codes":null,"thestermsFRIS":null,"taxtermsFRIS":null,"geotermsFRIS":null,"othtermsFRIS":null,"resmessage":"","complete":1,"sessions":{"newSesName":"Lyssens, Liesbeth, L.","newSesDate":{"date":"2011-12-22 20:32:15.553000","timezone_type":3,"timezone":"Europe/Brussels"},"updSesName":"Bouchti, Zohra, Z.","updSesDate":{"date":"2012-01-30 13:39:48.753000","timezone_type":3,"timezone":"Europe/Brussels"}}}