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*** Atmospheric CO2 concentrations (ppmv) derived from flask air   ***
*** samples collected at Shetland Island, Scotland                 ***
*** Source: L.P. Steele                                            ***
***              P.B. Krummel                                      ***  
***              R. L. Langenfelds,                                ***
***              Atmospheric, Research, Commonwealth Scientific,   ***
***              And Industrial Research Organisation,             ***
***              Aspendale, Victoria,                              *** 
***              Australia  3195                                   ***                   
***                                                                ***   
*** December 2002                                                  ***
***                                                                ***
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	Jan.	Feb	Mar.	Apr.	 May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Ann. Avg.
1992												358.8	
1993	359.33	360.42	361.85	361.82	361.66	359.39	351.37	346.74	349.13	353.29	357.28	360.44	356.89
1994	361.95	362.13	363.09	363.14	361.73	359.34	353.87	349.2	350.52	356.19	360.34	361.92	358.62
1995	363.58	364.17	364.53	364.96	364.17	360.91	355.28	351.93	353.86	358.19	361.35	363.77	360.56
1996	365.63	365.78	366.01	366.58	366.06	364.13	358.91	353.77	355.09	360.08	363.79	366.15	362.67
1997	366.86	366.9	367.86	368.52	368.13	365.04	358.85	354.84	356.49	361.19	365.47	367.75	363.99
1998	368.74	369.14	369.69	369.55	369.08	367.35	360.78	356.36	359.94	364.9	367.47	369.77	366.06
1999	371.8	372.09	372.22	372.53	371.64	369.08	363.62	359.49	361.76	365.76	368.66	371.05	368.31
2000	372.19	372.73	373.33	373.24	372.23	370.39	365.36	359.89	360.91	365.61	370.28	373.45	369.13
2001	374.23	374.88	375.93	376.01	374.59	371.81	366.37	361.3	362.83	367.79	371.53	374.39	370.97

Monthly values are expressed in parts per million (ppm) and reported in the WMO CO2 
Mole Fraction Scale (Zhao et al., 1997, J. Geophys. Res. 102 , 5885-5894). Monthly 
values are calculated as the mean of the daily values from a smooth curve fit to the data 
using 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.