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Geophysical Institute University of Bergen

Geophysical Institute University of Bergen. Spatio-temporal variability of fCO 2 along the North Sea VOS lines Abdirahman Omar GFI/BCCR, Norway Are Olsen Truls Johannessen BCCR/GFI, Norway Helmuth Thomas Dal, Canada. Outline. Data & observation platforms VOS lines Consistency & coverage

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Geophysical Institute University of Bergen

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  1. Geophysical Institute University of Bergen Spatio-temporal variability of fCO2 alongthe North Sea VOS linesAbdirahman OmarGFI/BCCR, Norway Are Olsen Truls JohannessenBCCR/GFI, NorwayHelmuth Thomas Dal, Canada

  2. Outline • Data & observation platforms • VOS lines • Consistency & coverage • Cruises • Databases • Spatio-temporal variations • Seasonal cycles • Latitudinal & longitudinal gradients • Year-to-year variations • Predictive equations • fCO2 controls • Basin-wide flux • Long-term fCO2 change

  3. Voluntary Observing Ships Nuka Arctica Northern North-East Atlantic and Nordic Seas Svalbard Greenland Nordic Seas North Sea (SST & fCO2) NwAC Bergen Iceland Norway NAC North Sea UK Trans Carrier North Atlantic Immingham Amsterdam (SST & fCO2)

  4. Julian Day EW-transect SST (°C) Number of data points NS-transect fCO2 (µatm) Julian Day Month Data coverage & consistency

  5. 4 cruises Data originator: Helmuth Thomas R/V Pelagia Aug/sep 2001 Nov 2001 Feb/Mar 2002 May 2002 fCO2 computed from CT & AT

  6. SST SST fCO2 (µatm) fCO2 (µatm) DfCO2 (µatm) DfCO2 (µatm) Seasonal variations

  7. Detrended fCO2 (µatm) Latitudinal gradients Data sorted by month & binned into 0.1°x1° grid -0.4 °C/lat -6 µatm/lat Murphy et al 2001, GRL, 28 Longitudinal gradients: 0.09 °C/lat, -0.7 µatm/lat

  8. 2007 2006 2005 month SST (°C) fCO2 (µatm) flux in flux (mol m-2 d-1) out O N D J F M A M J J A S O N D J F M A M J J A S O N D Year-to-year variations 1.14 mol C yr-1 0.63 mol C yr-1 1.52 mol C yr-1

  9. Predictive equation for Alk R= 0.75 rms ± 9 µmol kg-1 R= 0.95 rms ± 6 µmol kg-1

  10. Application 1 Controls of monthly fCO2 changes (Olsen et al., 2008, Biogeosciences)

  11. fCO2 controls NS-transect 05/06 2007 ”South” North

  12. Predictive equation for fCO2 Cruise data, 2001/2002 VOS + co-located data R=.73 std= ±26 µatm R=.88 std= ±15 µatm

  13. Application 2(work in progress) Long-term fCO2 change long-term change = DATA QUALITY?? 1986 2001/2002

  14. End

  15. vos VOS Application 3(future work) Basin-wide CO2 flux Source of FerryBox info: www.niva.no

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