United States Department of the Interior

Resolving circumarctic zero-curtain phenomena with AI-integrated earth observations

<title>Abstract</title> Across the circumarctic, permafrost landscapes store approximately 1700 billion metric tons of organic carbon - nearly twice atmospheric levels - yet reservoir stability depends on the zero-curtain, a subsurface thermal plateau that emerges when latent hea...

Wildfire Smoke beyond PM2.5: Distinct ChemicalMixtures and Hazard Profiles

Abstract Despite growing concern about wildfire smoke (WFS) exposure, research has largely focused on fine particle (PM2.5) mass rather than the complex airborne chemical mixtures that may pose distinct health risks. From March to September 2024, passive air samplers in two Briti...