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to remove dataset.Arctic sea ice concentrations calculated from passive microwave retrievals using the NASA bootstrap algorithm. Sea ice extent calculated by Holly Titchner. Comiso (1999, red) Comiso, J. 1999, updated 2008. Bootstrap Sea Ice Concentrations from NIMBUS-7 SMMR and DMSP SSM/I, 1979-2007. Boulder, Colorado USA: National Snow and Ice Data Center. Digital media. http://nsidc.org/data/nsidc-0079.html
Arctic sea ice concentrations from HadISST data set. Sea ice extent calculated by Holly Titchner. An update of Rayner et al. (2003, blue) Rayner NA, Parker DE, Horton EB, Folland CK, Alexander LV, Rowell DP, Kent EC, Kaplan A. 2003. Global analyses of sea surface temperature, sea-ice and night marine air temperature since the late nineteenth century. J. Geophys. Res. (Atmospheres) 108(D14): 4407-, DOI:10.1029/2002JD002670
Arctic sea ice concentrations calculated from passive microwave retrievals at NSIDC Fetterer et al. (2002, green) Fetterer, F., K. Knowles, W. Meier, and M. Savoie. 2002, updated 2009. Sea Ice Index. Boulder, Colorado USA: National Snow and Ice Data Center. Digital media . http://nsidc.org/data/docs/noaa/g02135_seaice_index/index.html ftp://sidads.colorado.edu/DATASETS/NOAA/G02135/Sep/
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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.
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Climate Services and Monitoring Division
http://www.ncdc.noaa.gov/bams-state-of-the-climate/2009-time-series/index.php