Parameter Abbreviation Description Potential and units indicator of: The relative Organic matter Carbon δ13C concentration source isotopes of the carbon (‰) isotope 13C compared to the more abundant isotope 12C, expressed relative to the carbon isotopic composition of a standard (VPDB). The relative Organic matter Nitrogen δ15N concentration source isotopes of the nitrogen (‰) isotope 15N compared to the more abundant isotope 14N, expressed relative to the nitrogen isotope composition of atmospheric nitrogen gas. Total TOC TOC and TN Organic matter organic refer to the concentration carbon and amount of TN organic Total carbon and nitrogen total nitrogen (%) in sediments respectively. Surface OC:SA TOC Organic matter area concentrations concentration normalised normalised to the specific TOC surface area (mg m-2) (SA) of sediments. Organic matter Carbon to Calculated nitrogen from the ratio source and of TOC to TN. quality ratios
Parameter and units Abbreviation Description Potential indicator of: Carbon isotopes (‰) δ13C The relative concentration of the carbon isotope 13C compared to the more abundant isotope 12C, expressed relative to the carbon isotopic composition of a standard (VPDB). Organic matter source Nitrogen isotopes (‰) δ15N The relative concentration of the nitrogen isotope 15N compared to the more abundant isotope 14N, expressed relative to the nitrogen isotope composition of atmospheric nitrogen gas. Organic matter source Total organic carbon and Total nitrogen (%) TOC TN TOC and TN refer to the amount of organic carbon and total nitrogen in sediments respectively. Organic matter concentration Surface area normalised TOC (mg m-2) OC:SA TOC concentrations normalised to the specific surface area (SA) of sediments. Organic matter concentration Carbon to nitrogen ratios Calculated from the ratio of TOC to TN. Organic matter source and quality
Rec2017_006.docx