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*** Atmospheric H2 concentrations (ppbv) derived from flask       ***
*** samples collected at South Pole                                ***
*** Source: L.P. Steele                                            ***
***              P.B. Krummel                                      ***  
***              R.L. Langenfelds                                  ***
***              Commonwealth Scientific,                          ***
***              and Industrial Research Organisation,             ***
***              Aspendale, Victoria,                              *** 
***              Australia  3195                                   ***                   
***                                                                ***   
*** March 2003                                                    ***
***                                                                ***
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Year	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Ann. Ave.

1992	525.88	527.01	525.95	523.59	519.9	516.22	513.21	511.11	510.4	511.71	515.65	520.48	518.43
1993	523.55	523.86	522.85	519.96	513.54	509.61	508.17	506.24	506.85	509.19	513.33	518.77	514.66
1994	522.32	523.25	523.01	520.51	516.8	514.71	512.34	510.42	512.24	515.44	519.86	526.37	518.11
1995	531.06	532.23	530.39	527.07	524.12	520.61	518.03	516.63	516.81	522.06	529.14	533.94	525.17
1996	536.62	536.91	534.92	530.82	525.37	520.72	518.52	517.36	516.83	518.78	523.11	528.07	525.67
1997	532.07	533.02	530.67	527.23	525.04	522.31	518.44	515.45	515.61	520.6	526.91	531.74	524.92
1998	535.89	536.93	536.94	537.21	534.49	530.92	527.86	526.16	527.59	530.75	535.03	540.32	533.34
1999	544.04	543.63	542.11	539.28	535.09	531.54	527.51	524.99	525.88	529.98	535.94	539.91	534.99
2000	541.39	541.76	540.22	535.76	530.45	526.53	522.92	521.63	521.89	523.32	528.33	533.37	530.63
2001	535.1	535.78	536.05	533.4	527.78	523.75	522.19	519.56	519.14	522.41	527.21	531.81	527.85

Monthly values are expressed in parts per billion per volume (ppbv) and reported in the CSIRO94 H2 scale. 
Monthly values were calculated as the mean of the daily values from a smooth curve fit to the data using 
the curve-fitting routines described by Thoning et al., 1989 (J. Geophys Res. 94, 8549-8565). Annual 
values are the arithmetic means of the 12 monthly values.