Figure 4. Temporal variations of some major parameters measured in the aerosol samples collected at Alert in the Canadian High Arctic.
Data of methanesulfonic acid (MSA) are from Kawamura et al.6.
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.