Climate Indicators - 2009
Choose a time series to plot:
Northern Hemisphere (March-April) Snow Cover
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- IPCC AR4 SPM
Northern Hemisphere March-April snow-cover anomalies relative to 1961-1990: from IPCC AR4 SPM based on an update of Brown (2000, blue) Brown, R.D., 2000: Northern hemisphere snow cover variability and change, 1915-97. J. Clim., 13, 23392355.
- Robinson and Frei
Northern Hemisphere March-April snow-cover anomalies relative to 1961-1990: Robinson and Frei (2000, red). Robinson, D.A. and A. Frei. 2000: Seasonal variability of northern hemisphere snow extent using visible satellite data. Professional Geographer , 51, 307-314. BAMS State of the Climate 2009 data, provided by Kate Willett
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Note: For each dataset, one value is plotted for each year in the period of record. For datasets with multiple values in one year, an average is calculated for one annual value. Missing annual values are interpolated between non-missing values.