The airsea R package

What is this repository for?

• Tools for marine air-sea gas exchange studies.
• Version 0.1

What can the package do?

• Calculate water-side and air-side gas transfer velocity using a range of modern parametisations.
• Calculate Schmit numbers for (almost) any gas
• Calculate bubble supersaturation effects (bubble induced equilibrium concentration)
• Calculate net community production from in-situ oxygen observations (also known as open water metabolism).
• Calculate various seawater properies, density, viscosity...

airsea and marelac

marelac and airsea have some similar features with differing implementation:

• Schmit number calculation, however marelac assumes 35 salinity, airsea has more gasses.
• Gas saturation concentration, airsea only includes O2 based on Benson and Krause. marelac uses Weiss for several gases and includes pressure compensation.

Gasses in marelac gas_schmit but not in airsea

• Helium (He)
• Sulfur hexafluoride (SF6)
• Trichlorofluoromethane (CCl3F)
• Dichlorodifluoromethane (CCl2f2)

TODO

• explore marelac vs liang solubility
• fully implement liang2013 bubble and kw

Installation

library(devtools)
install_github("tomhull/airsea")

References

• Hull T, Greenwood N, Kaiser J, Johnson M. Uncertainty and sensitivity in optode-based shelf-sea net community production estimates. Biogeosciences Discuss. Copernicus GmbH; 2015;12: 15611–15654. doi:10.5194/bgd-12-15611-2015

• Core gas transfer work taken from: Johnson MT. A numerical scheme to calculate temperature and salinity dependent air-water transfer velocities for any gas. Ocean Sci Discuss. 2010;7: 251–290. doi:10.5194/osd-7-251-2010