Factors controlling the acidity of natural rainwater

Garrels, R. M. & MacKenzie, F. T. Evolution of Sedimentary Rocks (Norton, New York, 1971).

Galloway, J. N. Likens, G. E. & Edgerton, E. S. Science 194, 722–724 (1976).

Likens, G. E. & Bormann, F. H. Science 184, 1176–1179 (1974).

Likens, G. E. Bormann, F. H. & Johnson, N. M. in Some Perspectives of the Major Biogeochemical Cycles SCOPE Rep. 17 (ed. Likens, G. E.) (Wiley, Chichester, 1981).

Hallberg, R. O. in Nitrogen, Phosphorus and Sulphur–Global Cycles SCOPE Rep. 7, (eds Svensson, B. H. & Söderlund, R.) 93–101 (Swedish Natural Science Research Council, 1976).

Granat, L. in Nitrogen, Phosphorus and Sulphur—Global Cycles SCOPE Rep. 7 (eds Svensson, B. H. and Söderlund, R.) 102–122 (1976).

Nguyen, B. C. Gaudry, A. Bonsang, B. & Lambert, G. Nature 275, 637–639 (1978).

Hansen, M. H., Ingvorsen, K. & Jørgensen, B. B. Limnol. Oceanogr. 23, 68–76 (1978).

Cadle, R. D. J. geophys. Res. 80, 1650–1652 (1975).

Friend, J. P. in Chemistry of the Lower Atmosphere (ed. Rasool, S. I.) 177–201 (Plenum, New York, 1973).

Cullis, C. F. & Hirschler, M. M. Atmos. Envir. 14, 1263–1278 (1980).

Rodhe, H. & Isaksen, I. J. geophys. Res. 85, 7401–7409 (1980).

Eriksson, E. Tellus 12, 63–109 (1960).

Rodhe, H. Atmos. Envir. 12, 671–680 (1978).

Rodhe, H. in Nitrogen, Phosphorus and Sulphur—Global Cycles SCOPE Rep. 7 (eds Svensson, B. H. & Söderlund, R.) 123–128 (Swedish Natural Science Research Council, 1976).

Galloway, J. N. & Whelpdale, D. M. Atmos. Envir. 14, 409–418 (1980).

Taylor, G. S. Baker, M. B. & Charlson, R. J. in Interaction of the Biogeochemical Cycles (eds Bolin, B. & Cook, R.) (Wiley, London, 1982).

Duce, R. A. Biogeochemical Cycles and the Air/Sea Exchange of Aerosols (Wiley, London, 1982).

Sillén, L. G. in Equilibrium Concepts in Natural Water Systems Adv. Chem. Ser. no. 67, 45–56 (American Chemical Society, Washington DC, 1967).

Junge, C. E. Air Chemistry and Radioactivity (Academic, New York, 1963).

OECD. The OECD Programme on Long Range Transport of Air Pollutants, Measurements and Findings (Organization for Economic Cooperation and Development, Paris, 1977).

Fletcher, N. H. The Physics of Rain Clouds (Cambridge University Press, 1962).

Slinn, W. G. N. et al. Atmos. Envir. 12, 2055–2087 (1978).

Scott, B. C. J. appl. Met. 20, 619–625 (1981).

Maroulis, P. J. Torres, A. L. Goldberg, A. B. & Bandy, A. R. J. geophys. Res. 85, 7345–7349 (1980).

Garland, J. A. Q. J. R. met. Soc. 97, 483 (1971).

Lawson, D. R. & Winchester, J. W. Science 205, 1267–1269 (1979).

Huebert, B. J. & Lazrus, A. L. J. geophys. Res. 85, 7337–7344 (1980).

Bonsang, B. Nguyen, B. C. Gaudry, A. & Lambert, G. J. geophys. Res. 85, 7410–7416 (1980).

Bolin, B. et al. Air Pollution Across National Boundaries ; The Impact on the Environment of Sulfur in Air and Precipitation (Royal Ministry for Foreign Affiairs, Stockholm, 1971).

Drabløs, D. & Tollan, A. Ecological Impact of Acid Precipitation; Proceedings of an International Conference (SNSF, Ås, Norway, 1980).

Granat, L. Atmos. Envir. 12, 413–424 (1978).

NOAA. Geophysical Monitoring for Climatic Change No. 7 (National Oceanic and Atmospheric Administration, Boulder, Colorado, 1979).

Kerr, R. A. Science 212, 1014 (1981).

Larsen, T. V. & Harrison, H. Atmos. Envir. 11, 1133–1141 (1977).