Optical proxies for terrestrial dissolved organic matter in estuaries and coastal waters

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dc.contributor.authorOsburn, Christopher L.
dc.contributor.authorBoyd, Thomas J.
dc.contributor.authorMontgomery, Michael T.
dc.contributor.authorBianchi, Thomas
dc.contributor.authorCoffin, Richard B.
dc.contributor.authorPaerl, Hans W.
dc.creator.orcidhttp://orcid.org/0000-0002-9334-4202en_US
dc.creator.orcidhttp://orcid.org/0000-0002-2890-7160en_US
dc.creator.orcidhttp://orcid.org/0000-0002-3068-2933en_US
dc.creator.orcidhttp://orcid.org/0000-0002-3812-9008en_US
dc.creator.orcidhttps://orcid.org/0000-0002-9334-4202
dc.creator.orcidhttps://orcid.org/0000-0002-2890-7160
dc.creator.orcidhttps://orcid.org/0000-0002-3068-2933
dc.creator.orcidhttps://orcid.org/0000-0002-3812-9008
dc.creator.orcidhttps://orcid.org/0000-0002-9334-4202
dc.creator.orcidhttps://orcid.org/0000-0002-2890-7160
dc.creator.orcidhttps://orcid.org/0000-0002-3068-2933
dc.creator.orcidhttps://orcid.org/0000-0002-3812-9008http://orcid.org/0000-0002-9334-4202
dc.creator.orcidhttp://orcid.org/0000-0002-2890-7160
dc.creator.orcidhttp://orcid.org/0000-0002-3068-2933
dc.creator.orcidhttp://orcid.org/0000-0002-3812-9008
dc.date.accessioned2022-03-23T18:20:13Z
dc.date.available2022-03-23T18:20:13Z
dc.date.issued2016-01-20
dc.description.abstractDissolved organic matter (DOM) absorbance and fluorescence were used as optical proxies to track terrestrial DOM fluxes through estuaries and coastal waters by comparing models developed for several coastal ecosystems. Key to using these optical properties is validating and calibrating them with chemical measurements, such as lignin-derived phenols—a proxy to quantify terrestrial DOM. Utilizing parallel factor analysis (PARAFAC), and comparing models statistically using the OpenFluor database (http://www.openfluor.org) we have found common, ubiquitous fluorescing components which correlate most strongly with lignin phenol concentrations in several estuarine and coastal environments. Optical proxies for lignin were computed for the following regions: Mackenzie River Estuary, Atchafalaya River Estuary (ARE), Charleston Harbor, Chesapeake Bay, and Neuse River Estuary (NRE) (all in North America). The slope of linear regression models relating CDOM absorption at 350 nm (a350) to DOC and to lignin, varied 5–10-fold among systems. Where seasonal observations were available from a region, there were distinct seasonal differences in equation parameters for these optical proxies. The variability appeared to be due primarily to river flow into these estuaries and secondarily to biogeochemical cycling of DOM within them. Despite the variability, overall models using single linear regression were developed that related dissolved organic carbon (DOC) concentration to CDOM (DOC = 40 ± 2 × a350 + 138 ± 16; R2 = 0.77; N = 130) and lignin (Σ8) to CDOM (Σ8 = 2.03 ± 0.07 × a350 − 0.47 ± 0.59; R2 = 0.87; N = 130). This wide variability suggested that local or regional optical models should be developed for predicting terrestrial DOM flux into coastal oceans and taken into account when upscaling to remote sensing observations and calibrations.en_US
dc.description.sponsorshipThe following agencies are thanked for their financial support: Strategic Environmental Research and Development Program, ER-1431 and ER-2124 (MM, CO); North Carolina Department of Environment and Natural Resources, Contracts #4443 and #5371 (HP, CO); and the Lower Neuse Basin Association (HP).en_US
dc.identifier.citationOsburn, C.L., Boyd, T.J., Montgomery, M.T., Bianchi, T.S., Coffin, R.B. and Paerl, H.W., 2016. Optical proxies for terrestrial dissolved organic matter in estuaries and coastal waters. Frontiers in Marine Science, 2, p.127.en_US
dc.identifier.doihttps://doi.org/10.3389/fmars.2015.00127
dc.identifier.urihttps://hdl.handle.net/1969.6/90313
dc.language.isoen_USen_US
dc.publisherFrontiersen_US
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectcdom absorbanceen_US
dc.subjectcdom fluorescenceen_US
dc.subjectdissolved organic matter (dom)en_US
dc.subjectligninen_US
dc.subjectcarbon stable isotopesen_US
dc.titleOptical proxies for terrestrial dissolved organic matter in estuaries and coastal watersen_US
dc.typeArticleen_US

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