I’m interested in understanding interactions between ocean dynamics, thermodynamics and biogeochemistry. I’m particularly interested in how physical changes affect the ocean carbon system on multiple timescales, with the associated feedback onto atmospheric CO2 levels:

  • Effects of Southern Ocean wind stress on ocean and atmospheric pCO2. E.g. using a mixed layer carbon budget to derive an analytical expression for Southern Ocean pCO2 as a function of wind stress and other physical parameters, verified using MITgcm experiments:
    Scaling_SO-page-001
    Figure shows Southern Ocean pCO2 as a function of mean area wind stress as modelled by an MITgcm idealized Atlantic ocean sector model, denoted by squares, and as predicted by the derived equation, denoted by the red line.
  • Remote inter-basin connections affecting surface carbon fluxes. E.g. Demonstrating an advective mechanism by which Southern Ocean winds affect the DIC and Alkalinity in the equatorial oxygen minimum zone, which is subsequently advected to the North Atlantic sub-polar region:
    Ranom-page-001
    Figure shows the time evolution of the Revelle Buffer Factor anomaly on the 1026 kg/m3 density surface in a 2xSouthern Ocean wind stress experiment with MITgcm idealized Atlantic Ocean model. Orange indicates a positive anomaly and blue a negative one. The blue arrows shows the flow field.
    See also the following video, which shows the time evolution of the regenerated DIC and Alkalinity anomaly on the 1026 kg/m3 density surface in a 4xCO2 step experiment with HadGEM2-ES. (orange indicates a positive anomaly and blue a negative one):
    DICreg_ALKreg_4CO2_8fps
  • Reconstructing warming patterns using anthropogenic carbon. E.g. demonstrating that DIC concentrations are much less affected by circulation changes than temperature anomalies and exploiting this to calculate the circulation change-induced temperature anomalies in complex climate models:
    Hfixhadgem2-page-001
    Figure shows the fixed current column heat content anomaly H’fix, the dynamically induced heat anomaly, calculated using anthropogenic carbon, H’dynamics, and the free current anomaly, H’free, in a 2xCO2 step experiment with HadGEM2-ES. No fixed current experiments were run to produce the figure.
Advertisements