Dry deposition

{
  "id": "MLC-T-ENV-008644",
  "term": "Dry deposition",
  "field": "Environment",
  "definition": "1. Pollutants in the air that fall onto the land or water as dry particles, without the aid of precipitation.\n\n2. The falling of small particles and gases to the Earth without rain or snow. Dry deposition is a component of acid deposition, more commonly referred to as acid rain.\n\n3. Flux of an airborne contaminant directly from the air to the surface, occurs by concurrent diffusion, gravitational settling, interception and impaction, and retention/rebound processes. Eddy diffusion and gravity move the particles near to surfaces; molecular diffusion, interception, and impaction move the particles to the surface; and retention/rebound determines if they stay on the surface. The formulations for dry deposition processes are typically coupled to the atmospheric dispersion models.\n\n4. Falling of small particles and gases to the Earth without rain or snow. Dry deposition is a component of acid deposition, more commonly referred to as acid rain.",
  "subject": "Natural environments",
  "references": [
    "Chesapeake Bay Glossary",
    "Acid Rain Glossary",
    "DOE Pacific Northwest National Laboratory Improved Formulations for Air-Surface Exchanges Related to National Security Needs: Dry Deposition Models at https://www.pnl.gov/main/publications/external/technical_reports/PNNL-15876.pdf"
  ],
  "url": "https://mlchart.com/terminology/environment/dry-deposition/"
}