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A manda H yde , U niversity o f N ew H ampshire (UNH)

A M ultiyear A ssessment o f B iological P erturbations o f C O 2 i n t he N ortheast C hannel o f t he G ulf o f M aine. A manda H yde , U niversity o f N ew H ampshire (UNH).

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A manda H yde , U niversity o f N ew H ampshire (UNH)

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  1. A Multiyear Assessment of Biological Perturbations of CO2 in the Northeast Channel of the Gulf of Maine Amanda Hyde, University of New Hampshire (UNH) Co-authors: Douglas Vandemark (UNH), Shawn Shellito (UNH), Joseph Salisbury (UNH), James Irish (UNH), Michael DeGrandpre (University of Montana)

  2. outline • Motivation • Controls on CO2 and pCO2 • Northeast Channel – Unique Dataset • Buoy N Instrument Cluster • QC pCO2 • QC O2 • DIC Models • Summary

  3. Motivation • Achieve a fuller understanding the air-sea fluxes of CO2 on the continental shelves (Previdi et al. 2009) • Better observations of physical, chemical, and biological processes contributing to CO2 fluctuations in the coastal oceans (Fennel et al. 2008) • Lacking high temporal and spatial resolution data on continental shelves (Previdi et al. 2009) Vandemark et al. 2011 Journal of Geophysical Research 116 Fennel et al. 2008 Geophysical Research Letters 35; Previdi et al. 2009 Journal of Geophysical Research 114

  4. Controls on Co2 andpCO2 Controls can be: • Physical • Biological • Chemical Equations of the carbon system: • CO2(g) = CO2(aq) • pCO2 = [CO2(aq)]/ KH • CO2 + H2O = H2CO3* = HCO3- + H+ = CO32- + 2H+ • TCO2 = DIC = H2CO3* + HCO3- + CO32- (Álvarez et al. 2002 Deep-Sea Research II 49: 643-662; DeGrandpre et al. 1997 Limnology Oceanography 42: 21-28; Fennel et al. 2008 Geophysical Research Letters 114; Morel and Hering 1993)

  5. Northeast Channel, Gulf of Maine pCO2 Deployment Sites of the Gulf of Maine & Scotian Shelf Halifax UNH/PMEL NE Channel Provided by: Doug Vandermark

  6. Buoy N Instruments UNH Instrument Cluster Depth: 3-5m. Provided by: Shawn Shellito Oxygen Optode 3835 (Aanderraa Instruments) SAMI-CO2 Sensor (Sunburst, LLC) UMO: gyre.umeoce.maine.edu

  7. Quality Control ofpCO2 • Data sent to Cory Beatty at University of Montana • Smoothed all the calibration errors out of data

  8. Quality Control of O2

  9. TIME SERIES OF DIC(USINGPCO2, SALINITY, AND MODELS)

  10. ControlsonDIC Entrainment Respiration Spring Bloom and Decay Production

  11. Summary • Data look good overall • Inverse biofouling seen and rectified on O2 data • Physical and biological controls on DIC apparent • Future Goals • Add 2010-2011 data • O2 and CO2 for biological DIC controls investigation (Carrillo et al. 2004) • O2, temperature, salinity, and current data for water mass CO2 controls

  12. Acknowledgements • Funding: • UNH/NASA Research and Discover Program • NFS Grant OCE-0851447 • Neil Pettigrew and the Physical Oceanography Group at the University of Maine, Orono • Cory Beatty (University of Montana) • Helmuth Thomas and Elizabeth Shadwick (Dalhousie University)

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