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Andrew Watson (scientist)
Andrew James Watson FRS (born 1952) is a British marine and atmospheric scientist and an expert in processes affecting atmospheric carbon dioxide and oxygen concentrations. He was formerly a Professor of biogeochemistry in the School of Environmental Sciences at the University of East Anglia, in 2013 he moved to a position as Professor at the College of Life and Environmental Sciences at the University of Exeter.
==Tracing ocean waters==
While at the Marine Biological Association and Plymouth Marine Laboratory in the 1980s, he developed techniques for tracking ocean water bodies using tracers such as sulphur hexafluoride and perfluorodecalin.〔Watson, A. J., Liddicoat, M. I. and J. R. Ledwell (1987). "Perfluorodecalin and sulphur hexafluoride as purposeful marine tracers: some deployment and analysis techniques." Deep Sea Research., 34, 19-31.〕 He and colleagues applied these to measure the slow mixing vertical rates in the ocean,〔Ledwell, J. R., Watson, A. J., and Law, C. S. (1993). Evidence of slow mixing across the pycnocline from an open ocean tracer release experiment. Nature. 364, 701-703〕 and to trace the movement of patches of surface water.〔Watson, A. J., Upstill-Goddard R. C. and P. S. Liss (1991). Air- sea gas exchange in rough and stormy seas measured by a dual- tracer technique. Nature 349, 145-147.〕 He also applied the technology to enable iron fertilization experiments.〔Watson, A. J.,P. S. Liss, and R. A. Duce (1992). Design of a small-scale iron fertilisation experiment. Limnology and Oceanography 36, 1960-1965〕 More than a dozen such experiments have now been carried out〔. Boyd, P. W., et al., (2007). Mesoscale iron-enrichment experiments 1993-2005: synthesis and future directions. Science 315, 612-61〕 and have proved that iron is an essential limiting nutrient in important areas of the world ocean.
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