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.
Last Modified 27 May 2005
Return to main ice climatology page