Constants

Optional constants listdictionary

The optional constants parameter is a listdictionary of numericsfloats. The values that can be set within the constants listdictionary are:

  • Mocean: Mass of the ocean (surface plus deep) in kg. Default is 1.4e21.
  • hsurf: Depth of the ocean surface layer in m. Default is 100.
  • taudeep: Overturning timescale of the deep ocean in yr. In particular, the rate of water mass flowing through the deep ocean, and also through the surface ocean, is equal to the mass of the deep ocean divided by this timescale. Default is 600.
  • rad2xco2: Radiative forcing from a doubling of CO2 in W/m2. Default is 3.7.
  • lambda: Earth’s feedback parameter in W/m2/K. Default is 1.2.
  • dCSLdT: Change in committed sea level per temperature anomaly in m/K. Default is 6.
  • tauSL: Timescale of adjustment of SL to CSL in yr. Default is 2000.
  • SLmax: Maximum possible sea-level rise (SLR) in m. Default is 60.
  • dlogFwcdT: Relative change in the terrestrial weathering of carbonates (Fwc) per degree change in global-mean surface-air temperature. The units are 1/K. Default is 0.02.
  • dlogFwsdT: Relative change in the terrestrial weathering of silicates (Fws) per degree change in global-mean surface-air temperature. The units are 1/K. Default is 0.10.
  • abc: The proportionality between the anomalous rate of seafloor calcium-carbonate deposition and the anomalous concentration of deep-ocean carbonate ions. The units are GtC/yr per mol/kg. Default is 3e3.