Name: PSC NAT area Units: million km2 Level: 460 K Date range (mmdd-mmdd): 0712-0815 Source: GMAO MERRA2 Missing: -9999.0 Year Data Minumum Maximum 1979 24.62 21.90 27.00 1980 24.52 22.03 26.78 1981 22.90 20.93 26.17 1982 23.36 21.76 25.93 1983 21.65 20.07 23.81 1984 23.29 21.48 26.03 1985 22.68 20.11 24.50 1986 21.01 17.57 23.41 1987 26.96 25.31 29.28 1988 23.10 20.30 27.01 1989 25.16 22.13 26.92 1990 23.97 21.10 25.66 1991 24.38 22.60 26.28 1992 21.86 20.53 23.40 1993 23.97 22.19 25.59 1994 23.76 21.82 26.69 1995 24.91 22.34 26.61 1996 24.24 19.39 27.03 1997 26.18 23.49 28.44 1998 25.42 23.34 27.87 1999 26.57 24.00 29.13 2000 28.66 26.98 30.48 2001 27.29 25.23 29.58 2002 22.41 19.25 23.79 2003 26.61 25.10 28.61 2004 23.71 21.45 26.17 2005 25.28 22.57 27.27 2006 27.58 24.51 29.72 2007 24.31 21.73 25.89 2008 26.28 23.76 28.72 2009 25.50 23.83 27.64 2010 21.39 18.72 25.94 2011 25.21 24.18 26.76 2012 22.67 20.94 24.28 2013 24.95 23.24 26.38 2014 24.88 23.42 26.01 2015 25.37 22.54 28.15 2016 25.90 24.63 27.73 2017 24.91 22.56 27.19 2018 26.29 23.79 27.51 2019 24.24 21.58 26.43 2020 26.44 23.88 28.80 2021 26.60 24.89 28.55 2022 26.56 23.02 28.76 2023 24.44 22.11 26.44