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The data are from Chapman, W. L. and J. E. Walsh, Long-Range Prediction of Regional Sea Ice Anomalies in the Arctic, Weather and Forecasting, 6, pp 271-288, 1991. The data are available from the The National Snow and Ice Data Center. These daily graphics have been derived at NCEP by first finding the fourier coefficients that best match the average of the 12 times per year observations over the periods of record. They are not linearly interpolated, as the seasonal cycle is distinctly sinusoidal rather than straight lines for a month at a time. The fourier coefficients are then used to estimate the daily values.

Robert.Grumbine@noaa.gov
Last Modified 27 May 2005
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