Following the spring-time polar sunrise, ozone concentrations in the lower troposphere episodically decline to near-zero levels. Measurements on Alaskan snow and sea ice suggest that photochemical reactions in surface snow serve as a major source of reactive bromine to the overlying atmosphere, contributing to episodic ozone depletion.
- Kerri A. Pratt
- Kyle D. Custard
- Brian H. Stirm
