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.
Spatial distribution of mean analysis spread (in ppbv, shaded) and mean ozone concentration (in ppbv, contour) from the reanalysis at 700 hPa averaged during the individual phases (from left to right, phases 1 to 4) for the reanalysis calculation.
