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.
Amplitudes A are calculated from decomposed variances, assuming that all parameters have a normal distribution, as A = 4·√σ2. Vertical dash lines mark the position of the long-term time series station.
