I thank the reviewers for their helpful comments and N. Blough, R. Del Vecchio, O. Zafiriou, P. Neale, D. Kieber, and B. Peake for providing pre-publication copies of manuscripts that were cited. This work was supported in part by a grant from the Office of Naval Research (N00014-98-F-0202). This paper has been reviewed in accordance with the U.S. Environmental Protection Agency's peer and administrative review policies and approved for publication. Mention of trade names or commercial products does not constitute an endorsement or recommendation for use by the U.S. EPA.
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