Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Time series of measured (A) Br and BrO, (B) Br/BrO ratios and O3, (C) Br2 and solar radiation, and (D) Hg0 and HgII levels near Utqiaġvik, Alaska during March 2012. Blue shading represents periods of active AMDEs and ODEs, which are also denoted with labeled arrows. Criteria for the highlighted depletion periods are described in Methods.
