We thank the NOAA Office of Global Programs Climate Change Data and Detection Program Element and the DOE Office of Health and Environmental Research for funding this work. NPG was also supported by a CASE studentship from the U.K. Natural Environment Research Council, Ref GT04/98/217/AS; GCH by the National Science Foundation; MRA by an Advanced Research Fellowship from the U.K. NERC; and PAS by the U.K. Department of the Environment, Transport and the Regions under Contract PECD 7/12/37.
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