Spectral diffusivity

{
  "id": "MLC-T-MET-009098",
  "term": "Spectral diffusivity",
  "field": "Meteorology and atmospheric science",
  "definition": "A turbulent diffusivity expressed as a function of wavenumber instead of a single constant, so that eddies of different sizes mix a diffusing scalar at different rates. It is used to generalize K-theory in plume dispersion models, where only eddies comparable to or smaller than the plume contribute to its spread, and it replaces the constant eddy diffusivity of ordinary gradient-transport closure.",
  "url": "https://mlchart.com/terminology/meteorology/spectral-diffusivity/"
}