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- Title
A Refinement of the McMillen (1988) Recursive Digital Filter for the Analysis of Atmospheric Turbulence.
- Authors
Falocchi, Marco; Giovannini, Lorenzo; Franceschi, Massimiliano de; Zardi, Dino
- Abstract
We present a refinement of the recursive digital filter proposed by McMillen (Boundary-Layer Meteorol 43:231-245, <xref>1988</xref>), for separating surface-layer turbulence from low-frequency fluctuations affecting the mean flow, especially over complex terrain. In fact, a straightforward application of the filter causes both an amplitude attenuation and a forward phase shift in the filtered signal. As a consequence turbulence fluctuations, evaluated as the difference between the original series and the filtered one, as well as higher-order moments calculated from them, may be affected by serious inaccuracies. The new algorithm (i) produces a rigorous zero-phase filter, (ii) restores the amplitude of the low-frequency signal, and (iii) corrects all filter-induced signal distortions.
- Subjects
ATMOSPHERIC turbulence; RECURSIVE filters; DIGITAL elevation models; AMPLIFICATION reactions; FREQUENCY discriminators
- Publication
Boundary-Layer Meteorology, 2018, Vol 168, Issue 3, p517
- ISSN
0006-8314
- Publication type
Article
- DOI
10.1007/s10546-018-0355-5