Figure_3.tif (118.05 kB)

Annual seasonality phase anomaly (Φ(t,192)) plotted with the deviation in length of day (LOD).

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posted on 20.02.2013, 20:29 by Stephen L. Katz, Stephanie E. Hampton, Lyubov R. Izmest'eva, Marianne V. Moore

LOD is presented as smoothed values where the variances contributed by harmonics higher than an annual period were lowered to match the raw Φ(t,192) time series (see Methods). The strong relationship suggested by visual inspection is supported by a high maximum cross-correlation coefficient between pre-whitened time series of 0.507 with no lag. Data were continuous from January 18th, 1963 to December 31st, 2003 (40 years).