ESS210B
Prof. Jin-Yi Yu
Aliasing
qThe variances at frequency higher than the Nyquist frequency (k>k*) will be “aliased” into lower frequency (k<k*) in the power spectrum. This is the so-called “aliasing problem”.
qThis is a problem if there are large variances in the data that have frequencies smaller than k*.
True Period = 2/3 Dt
Aliased Period = 2 Dt