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Quantifying competing carbon pathways in mesoscale upwelling filaments off NW Africa. (or the pitfalls of seawater CO 2 inversions). Nick Hardman-Mountford (CSIRO), Carol Robinson (UEA), Ricardo Torres, Tim Smyth, Ian Brown, Vasilis Kitidis, P. Nightingale, C. Widdicombe (PML).
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(or the pitfalls of seawater CO2 inversions)
Nick Hardman-Mountford (CSIRO), Carol Robinson (UEA), Ricardo Torres, Tim Smyth, Ian Brown, Vasilis Kitidis, P. Nightingale, C. Widdicombe (PML)
NCP = E
Rees et al. 2011
+The impact of coastal upwelling on the air-sea exchange of climatically important gases
Rosette bottle samples
CTD, MVP, ADCP, micro-turbulence, wirewalker, optics
T, S, fCO2
T, S, fCO2, O2, Fl
Patch 1: freshly upwelled, followed for 9 days
Patch 3: ~10 days old, followed for 8 days
Shadwick et al. 2010
Horizontal diffusion flux
Vertical entrainment (ventilation)
Vertical diffusion flux
Daily DIC change
depth integrated NCPt = Zeut(max DICt- max DICt-1) – Ft (– Vt)
Calculated using Nightingale et al. (2000)
Winds 6-14 m s-1 P1, 8-14 m s-1 P3
ΔpCO2 20-100 µatm P1, 60-110 µatm P3
Patch 1 sea-air flux starts high and reduces as seawater pCO2 reduces
Increase on 25-26/4 from ventilation?
Patch 3 sea-air flux higher on average, more gradual decline, driven by seawater pCO2 decline
Louicades et al. 2011
Patch 1 is net autotrophic and NCP* dominates over sea-air flux
Patch 3 shifts from autotrophic to heterotrophic between days
In ~trophic balance over all
NCP* dominates the signal but overall sea-air flux is greater
(NACW or BDA shelfwater)
Use change in nutricline depth and DIC gradient over nutricline
NCP (residual) has to increase with ventilation
Accounting for ventilation increases estimate of autotrophy - Is it real?
Acknowledgements: UK-SOLAS ICON team, National Marine Facilities staff, Captain and crew of RRS Discovery. Funding: UK Natural Environment Research Council (NERC). Satellite images provided by NEODAAS, UK.
Units on time plots legend!!!