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Goals: Present current estimates of carbon flux through aquatic and coastal systems.

Continental Coastal Interactions: Assessing carbon inventories and fluxes in watersheds, inland waters, and associated coastal margins: data sources and gaps David Butman , Jeremy Mathis, Rob Striegl. Goals: Present current estimates of carbon flux through aquatic and coastal systems.

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Goals: Present current estimates of carbon flux through aquatic and coastal systems.

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  1. Continental Coastal Interactions: Assessing carbon inventories and fluxes in watersheds, inland waters, and associated coastal margins: data sources and gapsDavid Butman, Jeremy Mathis, Rob Striegl Goals: • Present current estimates of carbon flux through aquatic and coastal systems. • Highlight uncertainties and data gaps in aquatic and coastal carbon cycle research. • Improve communication between the terrestrial, aquatic, and coastal carbon cycle science communities.

  2. Conterminous US Aquatic Carbon Totals (outward flux) • Terrestrial Forest NEP - observation/process based: • 19-21 g C m2 yr-1 (150-160 Tg C yr-1) Williams et al in prep (Jeff Masek Plenary) • Inversion models predict higher terrestrial sink

  3. Uncertainties and Data Needs • Common definitions of spatial domains, inland vs. estuarine vs coastal systems – (Terrestrial and Aquatic Communities). • Spatial data – lake areas, river surface areas, seasonal changes in area, wetland areas, inundation frequency and extent. • Observational Data – monitoring efforts must be maintained and improved, coastal (head of tide) chemical and flow data, wetland carbon observations.

  4. Questions raised: • How can we constrain uncertainties in aquatic flux estimates? • What are the sources of aquatic carbon and are these scale dependent? • Are the Great Lakes a net source or sink of CO2? • What are the effects of sea level rise on the mobilization of coastal carbon? • Can organic carbon export support the observed increase in pCO2 in the Bering Sea? • What efforts are underway to quantify permafrost contributions to aquatic carbon export? • Does the export of inorganic carbon as both DIC and pCO2 matter in terrestrial carbon accounting? • Can we improve our understanding both spatially and temporally of sources of aquatic and coastal carbon? • What is the role of disturbance and events (flooding, drought, hurricanes) on the aquatic and coastal carbon cycles) • Can we further refine the understanding of estuaries as sources of CO2 and continental shelves as sinks of CO2?

  5. Moving forward: • Continue to expand the community of aquatic and coastal carbon cycle scientists. • Seek Canadian and Mexican counterparts for NACP and OCB efforts • Increase and support efforts to measure aquatic and coastal carbon – (burial and atmospheric connections in particular). • Work to resolve temporally the inland aquatic carbon flux. • Continue to push for collaborative efforts to link the terrestrial and aquatic communities (NACP, OCB, cross disciplinary funding opportunities). • Attend today’s breakout session on terrestrial-aquatic-coastal carbon cycling integration.

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