CDOM and FDOM full-depth Nisken\u00a0profiles from\u00a0high-resolution surveys of DOM optical properties conducted during the R\/V Melville cruise\u00a0MV1310 in the Gulf of Alaska (August 4\u201321, 2013).\u00a0 CDOM and FDOM (w\/5 EEMS\/PARAFAC components).<\/p>\n
This dataset page provides data access for optical data in a data table with\u00a0select wavelengths and specific calculations.\u00a0 Text files containing each CDOM spectra for every scan used in the optical data table calculations are available in a zip file in the \"Data Files\" section on this page. [Note 2020-08-17, access to optical data table is pending]<\/p>\n
Data processing:<\/p>\n
Fluorescent DOM processing and PARAFAC modeling: Post-processing EEM spectra to correct and calibrate the spectra was conducted following Murphy et al. (2010) and included four steps: (1) manufacturer-provided spectral correction parameters were applied to each EEM, (2) inner filter effects were corrected for sample EEMs following Lakowicz (2013), (3) spectra were normalized to the MQ Raman peak area at an excitation wavelength of 350 nm, and (4) MQ Raman and Rayleigh scatter signals were removed using an interpolation method following protocols developed by Bahram et al. (2006). Fluorescence intensities (FI) are herein reported in Raman Units (RU).
\n A total of 518 samples were pooled for PARAFAC analysis using the DOMFluor toolbox in MATLAB (Stedmon and Bro, 2008). These included survey samples taken directly from vertical profile casts (N = 504) and from shipboard irradiations (see section 2.2) to capture potential components from photo-degraded EEMs measurements (N = 14). Due to higher fluorescent intensities in surface waters relative to deep samples, all EEM spectra were first normalized to unit intensity (i.e., individual fluorescence intensity maxima for each sample was set to 1.0) prior to the modeling process (Murphy et al., 2008). PARAFAC was then applied to the scaled EEM spectra and the model was constructed and further validated using split-half analysis. Once the modeling process was complete, fluorescence intensities were multiplied by their maximum intensities to obtain actual, non-normalized fluorescence intensities for each component in a given sample.<\/p>\n
CDOM processing: <\/p>\n
Baseline corrections for CDOM absorbance spectra were made by subtracting an offset value that corrects for scattering and refractive index differences between seawater and the MQ blank as described in Reader and Miller (2011). Our capillary waveguide produced a small, reproducible optical resonance (~0.002 m-1) centered close to zero absorbance at the longer wavelengths typically used for blank corrections (e.g., 700\u2013800 nm).
\n We chose to determine our offset value by fitting the raw absorbance spectra between 630 and 640 nm with a nonlinear fitting routine (\u201cnlinfit\u201d function, MATLAB\u00ae 2016 Statistics Toolbox; MathWorks, MA) to (Reader and Miller, 2011): A = Fe-s\u03bb + O
\nwhere A is the CDOM absorbance, F is a fitting parameter, S is the spectral slope coefficient, and O is a specific offset value obtained for each sample. We then calculated the corrected CDOM absorbance spectrum by normalizing the raw absorbance spectrum using this offset value and converting to a Napierian absorption coefficient spectrum according to: ag(\u03bb) = 2.303 x A(\u03bb) \/ L
\nwhere ag(\u03bb) (m-1) is the Napierian absorption coefficient of CDOM at wavelength \u03bb, A(\u03bb) (unitless) is the offset-corrected CDOM absorbance at \u03bb, and L (m) is the pathlength (0.922 m).
\n The specific ultraviolet absorbance (SUVA254, L mg-1 m-1) can be calculated by dividing ag(254) by the DOC concentration (Weishaar et al., 2003), reported by Hansell and associated with this project as cited above. The CDOM spectral slope coefficient (S) for the spectral range 275\u2013295 nm, hereafter referred to as S275-295, can be determined by calculating the slope of the log-transformed linear regression over the wavelength interval of 275\u2013295 nm (Helms et al., 2008).<\/p>\n
BCO-DMO data manager processing notes:
\n* Spectra text files attached to Dataset Landing page in the "Data Files" section
\n* Optical data table is not yet available from this page, communicating with data submitter about parameter descriptions and content.<\/p><\/div>","@type":"rdf:HTML"}],"http:\/\/purl.org\/dc\/terms\/identifier":[{"@value":"820932","@type":"xsd:int"}],"http:\/\/purl.org\/dc\/terms\/title":[{"@value":"Gulf of Alaska DOM Optics"}],"http:\/\/purl.org\/dc\/terms\/date":[{"@value":"2020-08-14T12:47:26-04:00","@type":"xsd:dateTime"}],"http:\/\/purl.org\/dc\/terms\/created":[{"@value":"2020-08-14T12:47:26-04:00","@type":"xsd:dateTime"}],"http:\/\/purl.org\/dc\/terms\/modified":[{"@value":"2020-08-17T15:45:27-04:00","@type":"xsd:dateTime"}],"http:\/\/rdfs.org\/ns\/void#inDataset":[{"@id":"http:\/\/www.bco-dmo.org\/"}],"http:\/\/ocean-data.org\/schema\/namedGraph":[{"@value":"urn:bcodmo:dataset:820932","@type":"xsd:token"}],"http:\/\/ocean-data.org\/schema\/osprey_page":[{"@id":"https:\/\/www.bco-dmo.org\/dataset\/820932"}],"http:\/\/ocean-data.org\/schema\/identifier":[{"@value":"_:Identifier820932"}],"http:\/\/ocean-data.org\/schema\/datasetTitle":[{"@value":"CDOM and FDOM full-depth Nisken profiles from high-resolution surveys of DOM optical properties conducted during the R\/V Melville cruise MV1310 in the Gulf of Alaska (August 4\u201321, 2013)","@language":"en-US"}],"http:\/\/ocean-data.org\/schema\/abstract":[{"@value":"","@language":"en-US"}],"http:\/\/purl.org\/dc\/terms\/rights":[{"@id":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"http:\/\/ocean-data.org\/schema\/deprecated":[{"@value":"false","@type":"xsd:boolean"}],"http:\/\/ocean-data.org\/schema\/temporalExtent":[{"@value":"_:temporalExtent820932"}],"http:\/\/ocean-data.org\/schema\/spatialCoverage":[{"@value":"_:spatialCoverage820932"}],"http:\/\/purl.org\/dc\/terms\/bibliographicCitation":[{"@value":"Miller, W., Medeiros, P. 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