Byrd 00Z pressure 1980 - - 813.6 819.2 817.3 803.0 817.6 811.2 811.0 800.4 815.9 816.8 1981 - 816.9 817.7 813.5 808.4 802.2 806.2 806.2 805.8 806.2 804.2 809.8 1982 821.5 814.5 804.1 798.9 805.0 803.9 808.2 801.9 796.9 801.9 812.1 824.6 1983 821.3 816.9 812.3 808.0 813.0 805.5 799.9 - 803.8 794.2 802.9 813.1 1984 821.8 817.2 809.0 808.2 810.4 810.0 794.1 799.2 798.9 807.7 806.7 821.4 1985 820.4 813.5 811.0 808.6 - 806.6 790.9 799.0 796.5 800.4 802.5 810.1 1986 817.1 819.7 815.0 806.5 819.6 813.1 800.9 799.0 793.9 798.3 806.6 812.7 1987 821.2 816.3 804.7 810.0 809.9 811.3 816.0 801.3 807.7 801.4 803.2 816.5 1988 817.6 812.2 - - - - - - - - - - 1989 - - - - - - - - - - - - 1990 - 810.0 810.2 816.0 819.8 803.2 812.5 798.2 795.3 - - - 1991 - 818.3 805.3 808.9 812.9 812.7 811.0 800.4 804.2 804.6 810.0 825.0 1992 818.7 821.5 817.5 808.5 819.1 - - - - - - - 1993 - 810.6 810.1 807.2 - 807.4 802.0 800.8 797.3 800.2 808.2 812.9 1994 - 810.2 804.4 813.2 809.3 818.8 812.5 793.6 805.7 806.2 814.8 815.6 1995 812.5 812.5 813.9 805.8 803.9 817.2 819.4 808.9 801.5 802.9 806.3 809.7 1996 817.0 816.6 807.7 - - - - - - - - - 1997 - 820.4 806.5 807.6 799.8 814.8 803.8 798.6 805.5 809.5 818.8 823.3 1998 815.6 813.2 808.7 799.5 811.3 807.0 801.3 800.1 807.1 805.1 801.1 812.4 1999 814.9 813.2 808.8 803.7 799.2 - - - - - - 805.4 2000 - - - - - 811.2 805.7 809.4 - - - - 2001 - - - - - - - - - - - - 2002 814.1 806.7 819.2 805.6 - - - - - - - 810.9 2003 - - - - - - - - - - - - 2004 - - - - - - - - - - - - 2005 - - - - - - - - - - - - 2006 - - - - - - - - - - - - 2007 - - - 814.0 809.9 811.2 820.4 803.9 - - 814.0 807.3 2008 815.4 811.3 814.5 810.0 807.2 - - - - 803.3 - - 2009 - - - - - - - - - - - -