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A Practical Example of Low-Frequency Trend Removal

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Abstract

Three different ‘classical’ methods of removing low-frequency trends are used to detrend some instrumental data, and their effect is evaluated. The examples given here highlight problems that may occur whenever detrending is necessary. The trend present in the data arises from the passage of synoptic weather systems over the Antarctic during the operation of the instrument. The resultant signal varies over a period of hours. This contrasts with the phenomenon to be studied (atmospheric gravity waves), which have periods of a few tens of minutes at most and amplitudes typically one or two orders of magnitude smaller than for synoptic systems. The trend removal procedure is relevant to many more situations than the analysis of meteorological pressure data.

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Authors and Affiliations

  1. School of Mathematics and Statistics, The University of Sheffield, Sheffield, U.K

    J.C.W. Denholm-Price & J.M. Rees

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  1. J.C.W. Denholm-Price
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  2. J.M. Rees
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Denholm-Price, J., Rees, J. A Practical Example of Low-Frequency Trend Removal. Boundary-Layer Meteorology 86, 181–187 (1998). https://doi.org/10.1023/A:1000566921106

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  • DOI: https://doi.org/10.1023/A:1000566921106

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