Byrd 06Z pressure 1980 - - 813.1 818.8 816.9 802.9 817.6 811.1 810.9 800.8 815.8 816.8 1981 - 816.7 818.1 813.6 808.8 802.8 806.0 805.8 805.9 806.0 804.2 809.8 1982 821.4 814.2 804.2 799.0 804.9 803.9 807.8 801.6 797.1 801.5 812.2 824.2 1983 820.8 816.7 812.0 807.8 813.0 804.8 799.6 794.8 804.3 794.5 802.7 813.0 1984 821.5 816.9 809.0 808.1 810.5 810.3 793.4 799.2 798.9 807.5 806.6 821.3 1985 820.5 813.2 811.0 808.4 812.8 806.4 790.2 799.2 796.2 800.0 802.4 809.7 1986 816.6 819.7 814.4 806.4 819.6 812.4 801.3 800.2 793.8 798.4 805.7 812.1 1987 821.1 815.9 804.8 809.7 809.4 810.8 815.4 801.0 808.0 801.4 803.3 816.5 1988 817.3 811.7 - - - - - - - - - - 1989 - - - - - - - - - - - - 1990 - 809.9 810.0 815.5 819.7 803.0 812.2 798.2 795.3 - - - 1991 - 818.0 805.0 808.8 812.6 812.4 810.9 800.0 804.0 804.4 810.2 824.9 1992 818.5 821.4 817.0 808.4 818.5 - - - - - - - 1993 - 809.9 810.0 806.7 - 808.0 801.4 801.4 796.6 800.9 808.0 812.7 1994 - 809.8 804.5 812.9 809.3 818.4 812.2 793.6 805.7 805.6 814.6 815.4 1995 812.7 812.0 813.9 805.8 803.9 816.9 819.2 808.4 801.1 803.0 806.3 809.6 1996 817.0 816.2 807.5 - - - - - - - - - 1997 - 820.1 806.5 807.2 800.2 815.2 803.7 797.9 805.0 809.4 818.8 823.1 1998 815.3 813.1 808.3 799.4 810.8 806.9 801.1 800.1 807.3 804.7 801.0 812.5 1999 814.7 813.2 808.7 803.4 799.0 - - - - - - 805.6 2000 - - - - - 811.1 805.8 809.0 - - - - 2001 - - - - - - - - - - - - 2002 814.3 806.4 818.9 - - - - - - - - 810.9 2003 - - - - - - - - - - - - 2004 - - - - - - - - - - - - 2005 - - - - - - - - - - - - 2006 - - - - - - - - - - - - 2007 - - - 814.2 809.8 811.0 820.0 804.2 - - 813.8 807.1 2008 815.2 811.3 814.4 810.0 807.0 - - - - 803.4 - - 2009 - - - - - - - - - - - -