References

1. Bousquet , P. , Ciais , P. , Monfray , P. , Balkanski , Y. , Ramonet , M. and Tans , P . 1996 . Influence of two atmospheric transport models on inferring sources and sinks of atmospheric CO2 . Tellus 48B , 568 – 582 .  

2. Braswell , B. H. , Schimel , D. S. , Linder , E. and Moore III, B. 1997. The response of global terrestrial ecosystems to interannual temperature variability. Sci-ence 278 , 870 – 872  

3. Ciais , P. , Tans , P. P. , Trollier , M. , White , J. W. C. and Francey , R. J . 1995a . A large northern hemisphere terrestrial CO2 sink indicated by “C/“C of atmo-spheric CO2 . Science 269 , 1098 – 1102 .  

4. Ciais , P. , Tans , P. P. , White , J. W. C. , Trolier , M. , Fran-cey , R. J. , Berry , J. A. , Randall , D.R. ., Sellers, P. J., Collatz, J. G. and Schimel, D. S. 1995b. Partitioning of ocean and land uptake of CO2 as inferred by S“C measurements from the NOAA Climate Monitoring and Diagnostics Laboratory Global Air Sampling Network. J. Geophys. Res . 100 , 5051 – 5070  

5. Conway , T. J. , Tans , P. P. , Waterman , L. S. , Thoning , K. W. , Kitzis, D. R., Masarie, K. A. and Zhang, N. 1994. Evidence for interannual variability of the carbon cycle from the National Oceanic and Atmo-spheric Administration/Climate Monitoring and Dia-gnostics Laboratory Global Air Sampling Network. J. Geophys. Res . 99 , 22831 – 22855  

6. Dai , A. and Fung , I. Y . 1993 . Can climate variability contribute to the “missing” CO2 sink? Glob. Biogeo-chem. Cyc . 7 , 599 – 609 .  

7. Enting , I. G. , Trudinger , C. M. and Francey , R. J . 1995 , A synthesis inversion of the concentration and S “C of atmospheric CO2 . Tellus 47B , 35 – 52 .  

8. Feely , R. A. , Gammon , R. H. , Taft , B. A. , Pullen , P. E. , Waterman , L. S. , Conway , T. J. , Gendron , J. F. and Wisegarver , D. P . 1987 . Distribution of chemical tracers in the eastern equatorial Pacific during and after the 1982-83 El Nifio/southern oscillation event . J. Geophys. Res . 92 , 6545 – 6558 .  

9. Francey , R. J. , Tans , P. P. , Allison , C. E. , Enting , I. G. , White , J. W. C. and Trolier , M . 1995 . Changes in oceanic and terrestrial carbon uptake since 1982 . Nature 373 , 326 – 330 .  

10. Keeling , C.D. ., Piper, S. C. and Heimann, M. 1989. A 3-dimensional model of atmospheric CO2 transport based on observed winds (4). Mean annual gradients and interannual variations. Aspects of climate variabil-ity in the Pacific and the Western Americas. Geophysical Monograph 55. D. Peterson (ed.). AGU, Washington, USA, pp. 305 – 363 .  

11. Keeling , C.D. ., Whorf, T. P., Wahlen, M. and van der Plicht, J. 1995. Interannual extremes in the rate of rise of atmospheric carbon dioxide since 1980. Nature 375 , 666 – 670  

12. Law , R. and Simmonds , I . 1996 . The sensitivity of deduced CO2 sources and sinks to variations in trans-port and imposed surface concentrations . Tellus 48B , 613 – 625 .  

13. Law , R. M . 1999 . CO2 sources from a mass-balance inversion: sensitivity to the surface constraint . Tellus , this issue .  

14. Nakazawa , T. , Morimoto , S. , Aoki , S. and Tanaka , M . 1997 . Temporal and spatial variations of the carbon isotopic ratio of atmospheric carbon dioxide in the western Pacific region . J. Geophys. Res . 102 , 1271 – 1285 .  

15. Rayner , P. J. , Enting , I. G. , Francey , R. J. and Langen-felds , R. L . 1999 . Reconstructing the recent carbon cycle from atmospheric CO2, S“C and 02/N2 obser-vations . Tellus 51B , 213 – 232 .  

16. Tans , P. P. , Fung , I. Y. and Takahashi , T . 1990 . Observa-tional constraints on the global atmospheric CO2 budget . Science 247 , 1431 – 1438 .