Figure 4.
Temporal availability of records and corresponding sampling intensity. Only the period of 1981–2000 has been considered in CLIMBER.
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.