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Carbon budget for the continental shelf of the Eastern United States

This study analyzes carbon fluxes in the Eastern US continental shelf, including inputs from land, air-sea exchange, sedimentary fluxes, and interfacial fluxes. The study also examines primary production, respiration, and net community production. The results provide insight into the carbon budget for this region.

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Carbon budget for the continental shelf of the Eastern United States

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  1. Carbon budget for the continental shelf of the Eastern United States R. Najjar, D. Butman, W.-J. Cai, M. Friedrichs, A. Mannino, P. Raymond, J. Salisbury, and D. Vandemark Ocean Carbon and Biogeochemistry Meeting July 20-24, 2009

  2. 500 m isobath

  3. Fluxes of interest • Inputs from land of DOC, POC, and DIC • Air-sea: Exchange of CO2, rainwater DOC • Sedimentary fluxes: POC deposition, DOC & DIC exchange • Shelf-break exchange: DIC, DOC, POC • Convention: >0 when input to water column Interfacial fluxes: Internal fluxes: • Primary production • Respiration • Net community production

  4. Input from land (1012 g C yr-1)

  5. East Coast DOC Sites 257 USGS gauging stations with DOC concentrations Watersheds delineated from the NHDPlus dataset Yields calculated using LOADEST model Will also look at POC, DIC & Alk

  6. Air-to-sea CO2 fluxes 1Recomputed by Fennel et al. (2008) using different areas. Global mean ~0.5 mol m-2 yr.

  7. Rainwater DOC fluxes • GoM, MAB precip. ~ 1 m yr-1 • [DOC] in rain ~ 50-100 mmol m-3 • Fluxes ~ 0.05 – 0.1 mol C m-2 yr-1 • Total flux to shelf ~ 0.28 ± 0.09 × 1012 g C yr-1

  8. Sediment-water interface (1012 g C yr-1)

  9. Cross-shelf exchange (1012 g C yr-1)

  10. USECoS Model fluxes from open ocean (1012 g C yr-1) M. Friedrichs analysis of NENA1 simulation, 2004-2006

  11. Water column primary production (0.2% of global primary production, global areal mean = 12 mol m-2 yr-1)

  12. f-ratios

  13. Respiration • SAB, about the same as primary production (Jiang et al. 2009) • Few measurements in MAB, GoM

  14. Shelf-wide budget (1012 g C yr-1) DIC & TOC > 5 CO2 2.1 ± 1.0 Atmosphere DOC in rain 0.28 ± 0.09 Land Prim. Prod.100 DOC ~ 8 Resp.? Export Prod.? DIC? POC? Water column POC Open Ocean DOC DIC Sediments

  15. Important but poorly known • Cross shelf water & C budgets • Estuarine/marsh processing of C • Water column respiration (SAB) • Shelf sediment fluxes (better on slope!)

  16. Thank you

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