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   dcterms:identifier "key-message-16-4";
   gcis:findingNumber "16.4"^^xsd:string;
   gcis:findingStatement "Expanded monitoring, more complete syntheses of available observations, and extension of existing model capabilities are required to provide more reliable coastal carbon budgets, projections of future states of the coastal ocean, and quantification of anthropogenic carbon contributions."^^xsd:string;
   gcis:isFindingOf <>;
   gcis:isFindingOf <>;

## Properties of the finding:
   gcis:descriptionOfEvidenceBase "The underlying motivation for constructing complete carbon budgets for coastal waters is that permanent burial of carbon in coastal sediments and export of carbon from coastal waters to the deep ocean both remove anthropogenic carbon from the atmospheric reservoir. The relevant carbon flux in this context is the burial or export of anthropogenic carbon, not total burial or export. Only total fluxes can be observed directly. Distinction between anthropogenic fluxes and the natural background has not been attempted in regional observational or modeling studies, because more comprehensive accounting than is available for carbon fluxes and improved modeling capabilities would be needed. The study by Bourgeois et al. (2016) is the first to estimate coastal anthropogenic carbon uptake in a global model. The estimated net air-sea exchange of CO<sub>2</sub> from this global model is reported for a regional decomposition of the EEZs of the United States, Canada, and Mexico in Table 16.3. The model simulates a net uptake of CO<sub>2</sub> in North American coastal waters that is of similar magnitude to estimates of organic carbon burial and riverine carbon input, but the latter two numbers are uncertain because they are each taken from one individual study and not corroborated by multiple references. However, the similar magnitudes of these numbers illustrate that current coastal carbon budgets are uncertain and that constraining just the air-sea gas exchange will not be sufficient to quantify the export of anthropogenic carbon by coastal processes."^^xsd:string;
   gcis:newInformationAndRemainingUncertainties "This report’s synthesis of the current literature shows that the magnitudes of several significant components of coastal carbon budgets are currently uncertain."^^xsd:string;

   a gcis:Finding .

## This finding cites the following entities:

   prov:wasDerivedFrom <>.