year mo    data_type region extent   area
1978 11      Goddard      N  12.02   8.95
1979 11      Goddard      N  11.16   8.29
1980 11      Goddard      N  11.69   8.64
1981 11      Goddard      N  11.17   8.23
1982 11      Goddard      N  11.91   8.97
1983 11      Goddard      N  11.64   8.91
1984 11      Goddard      N  11.29   8.15
1985 11      Goddard      N  11.39   8.35
1986 11      Goddard      N  11.78   8.81
1987 11      Goddard      N  11.52   9.67
1988 11      Goddard      N  11.69   9.86
1989 11      Goddard      N  11.50   9.38
1990 11      Goddard      N  11.31   9.58
1991 11      Goddard      N  11.12   9.19
1992 11      Goddard      N  11.87   9.69
1993 11      Goddard      N  11.73   9.49
1994 11      Goddard      N  11.30   9.64
1995 11      Goddard      N  10.97   8.95
1996 11      Goddard      N  10.56   8.70
1997 11      Goddard      N  10.91   9.00
1998 11      Goddard      N  10.75   8.82
1999 11      Goddard      N  10.99   9.21
2000 11      Goddard      N  10.54   8.81
2001 11      Goddard      N  10.92   9.02
2002 11      Goddard      N  10.78   8.69
2003 11      Goddard      N  10.29   8.50
2004 11      Goddard      N  10.65   8.90
2005 11      Goddard      N  10.47   8.73
2006 11      Goddard      N   9.84   8.07
2007 11      Goddard      N  10.05   8.00
2008 11       PRELIM      N  10.63   8.70
2009 11      NRTSI-G      N  10.26   7.98


Important Notes: 1) The "extent" column includes the area near the pole not
imaged by the sensor. It is assumed to be entirely ice covered with at	least
15% concentration. However, the "area" column excludes the area not  imaged by
the sensor. This area is 1.19 million square kilometers for SMMR  (from the
beginning of the series through June 1987) and 0.31 million  square kilometers
for SSM/I (from July 1987 to present). Therefore, there  is a discontinuity in
the "area" data values in this file at the June/July  1987 boundary. 2) When
insufficient satellite data is available to process the area and extent values,
the data is flagged as -9999. For more information see Processing Steps,
Monthly Mean Ice Concentration in the documentation -
http://nsidc.org/data/docs/noaa/g02135_seaice_index/index.html#processingstep.