Nansen_Ice_Sheet 18Z pressure 1987 - - 986.6 - - - - - - 978.9 978.6 985.3 1988 988.3 984.3 985.9 - - - - - - - 980.9 982.4 1989 984.9 984.2 985.1 988.5 973.4 982.4 981.2 986.6 984.1 976.9 976.6 988.7 1990 987.8 981.3 986.1 995.4 998.8 990.3 997.2 983.2 973.5 982.7 983.8 984.3 1991 981.9 988.7 982.1 988.0 988.7 991.1 993.1 983.5 983.5 978.0 984.2 994.2 1992 988.4 995.3 987.6 987.3 992.2 996.9 984.9 986.1 977.5 981.3 978.4 983.2 1993 995.7 979.9 987.6 984.2 985.3 978.5 975.5 979.4 978.4 977.8 - 983.0 1994 985.2 983.5 980.6 987.5 987.7 1002.0 990.7 977.8 990.8 979.8 985.3 981.5 1995 981.6 982.6 991.8 984.7 981.7 991.7 1002.8 988.1 979.4 981.8 979.9 - 1996 986.9 990.9 - - - - 986.5 990.0 992.2 974.4 988.2 986.7 1997 989.4 990.1 980.8 988.4 976.9 989.7 982.3 979.9 982.9 979.1 989.2 991.1 1998 985.7 982.3 984.3 977.8 984.9 980.8 983.3 981.2 990.3 982.5 975.9 983.0 1999 984.4 988.7 986.6 982.5 981.7 1000.8 981.8 986.5 985.0 968.4 973.9 975.3 2000 979.1 983.3 986.0 985.4 984.1 - - - - - - 996.1 2001 991.0 989.9 - 981.2 - - - 984.6 981.4 - 977.6 977.7 2002 983.7 979.4 992.4 983.4 994.6 995.0 991.4 981.3 988.5 991.4 - - 2003 - - - - - - - - - - - - 2004 - - - - - - - - - - - - 2005 - - - - - - - - - - - - 2006 - - - - - - - - - - - - 2007 - - - - - - - - - - - - 2008 - - - - - - - - - - - - 2009 - - - - - - - - - - - -