A ballpark estimate of the Pan-Arctic vertical nitrate flux
Sources:
fn-compilation.csv: doi:10.3389/fmars.2020.00150, see https://raw.githubusercontent.com/poplarShift/arctic-nitrate-fluxes/master/data/fn-compilation.csv at commit e7f9af08
regions.shp etc: Drawn in QGIS, roughly based on doi:10.1016/j.pocean.2012.11.006