Arctic Oscillation and Good Wind Comparison
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This comparison looks at the Arctic Oscillation Index and the number of North Pole Good Winds. The 7 day running means of both data sets were plotted using the matlab script, aomean.m, and the correlation between them was found using corrcoeff.m. The matlab script, aofft.m, was used to compute the Fourier transforms of the AO and Good Wind plots to find the frequencies of each. The wind data used is the good wind totals from Terra greater than 1500 and is divided by 1000 to fit the graphs.
Analysis begins June 1, 2002 (Day 152) and ends April 18, 2003 (Day 109) for a total of 322 days.
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NOTE: Using all the data points the correlation coefficient is -0.4006, but with a 4 day shift of the AO Index to the right the correlation coefficient improved to -0.4487. However, this did not have a significant impact on the frequency graphs.
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AO/GD Correlation |
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NOTE: Both data sets have common frequencies of 0.016 and .0035, meaning each has cycles of approximately 62.5 days and 286 days.
The AO also has frequencies of 0.022, 0.029, 0.04, and 0 .053 which corresponds to cycles of 46, 35, 24, and 19 days. The Good Winds have frequencies of 0.025, 0.032, and 0.063 corresponding to cycles of 40, 31, and 16 days.
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- Good Wind Frequency
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