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Seasonal variation in SCF and relative dust frequency (to the highest dust frequency), both at the -20 °C isotherm. Pattern correlation coefficients between SCF and dust frequency for the Northern Hemisphere are negative for all seasons: -0.1, -0.5, -0.5, and -0.6 for JJA, September-October-November (SON), December-January-February (DJF), and MAM, respectively.
