Acknowledgements

This report contains the results of many years of work which could not have been completed without the help of many colleagues. We are especially grateful to J. Bullister, E. Dlugokencky, K. Harrison, E. Hoopes, P. Murphy, M. Warner, and the officers and crews of the many research vessels upon which we have worked for their assistance with the shipboard operations. This work was supported by grants from the marine Chemistry and Physical Oceanography programs of the National Science Foundation and from the Department of Energy, often as an ancillary part of our seagoing chlorofluorocarbon tracer meauserment efforts.