Repository logo
 
Publication

Light absorption by particulate and dissolved organic matter in coastal and oceanic off the South west coast of Europe: a contribution to MERIS sensor validation

2010-09-20Conference object Restricted
Simple item page
dc.contributor.authorGoela, Priscila
dc.contributor.authorCristina, Sónia
dc.contributor.authorIcely, John
dc.contributor.authorNewton, Alice
dc.date.accessioned2013-04-18T12:43:52Z
dc.date.available2013-04-18T12:43:52Z
dc.date.issued2010-09-20
dc.description.abstractThe two variable components of light absorption, which are important contributors to the correct adjustments of ocean colour algorithms, are considered and discussed in this study, conducted in the Southwest coast of Portugal; these are particulate absorption – separated into phytoplankton and non-algal particles absorption, and coloured dissolved organic matter absorption, expressed in terms of their coefficients – ap(), aph(), anap() and aCDOM(), respectively. This study is part of a global effort to collect data to validate marine products of MERIS, the ENVISAT ocean colour sensor, as contracted by European Space Agency (ESA). Particulate absorptions were determined with Transmittance-Reflectance approach, using NaClO bleaching to remove phytoplankton contribution to the total particulate matter absorption spectra; YSBPA absorption coefficient was assessed according to MERIS validation protocols. Phytoplankton absorption coefficients were transformed into specific coefficients – a*ph(), normalizing it with respect to chlorophyll a concentrations determined both by HPLC and spectrophotometric methods. Results show that the absorption of light by particulate matter is almost totally dependent on the phytoplankton, with no significant contribution from non-algal particles (mean contribution of 10% to total particulate absorption), both in coastal and oceanic waters, emphasising the dominance of case 1-type waters. Specific chlorophyll absorption coefficients show significant fluctuations between seasons and stations, ranging from 0.007 to 0.09 at 678 nm; however, a good correlation between ap(443) and ap at other MERIS equivalent wavelengths was found. Particulate matter has generally more weight than dissolved matter absorption in the total absorption budget. These results may contribute to improve and correct regional ocean colour algorithms.por
dc.identifier.otherAUT: ANE00265;
dc.identifier.urihttp://hdl.handle.net/10400.1/2667
dc.language.isoengpor
dc.peerreviewedyespor
dc.titleLight absorption by particulate and dissolved organic matter in coastal and oceanic off the South west coast of Europe: a contribution to MERIS sensor validationpor
dc.typeconference object
dspace.entity.typePublication
oaire.citation.conferencePlaceAnchorage, Alaska, U.S.A.por
oaire.citation.endPage10por
oaire.citation.startPage1por
oaire.citation.titleOcean Optics Conference XXpor
person.familyNameGoela
person.familyNameCristina
person.familyNameIcely
person.familyNameNewton
person.givenNamePriscila
person.givenNameSónia
person.givenNameJohn
person.givenNameAlice
person.identifier333937
person.identifier.ciencia-idB713-3911-1803
person.identifier.ciencia-id6F13-1247-B2B7
person.identifier.orcid0000-0001-9786-1269
person.identifier.orcid0000-0002-5716-9750
person.identifier.orcid0000-0002-9114-8283
person.identifier.orcid0000-0001-9286-5914
person.identifier.scopus-author-id55957312000
person.identifier.scopus-author-id6506626316
person.identifier.scopus-author-id7201391894
rcaap.rightsrestrictedAccesspor
rcaap.typeconferenceObjectpor
relation.isAuthorOfPublication4017dcea-9040-43b3-8389-851e29d2dccb
relation.isAuthorOfPublicationc667b6f1-a4fa-4519-be5a-26e6b98f4ce7
relation.isAuthorOfPublicationd8d4a6eb-57ae-440b-99b9-5f981d237cdf
relation.isAuthorOfPublication636c0a22-6cf2-4324-a704-64777269e97d
relation.isAuthorOfPublication.latestForDiscoveryd8d4a6eb-57ae-440b-99b9-5f981d237cdf

Files

Original bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
7- Goela et al 2010 - Alaska.pdf
Size:
137.04 KB
Format:
Adobe Portable Document Format
Download

Collections

FCT2-Artigos (em revistas ou actas indexadas)
CIM2-Artigos (em revistas ou actas indexadas)