We thank the following individuals and organizations for their assistance in this research: Peter Lechner of the Civil Aviation Administration and Kip Marks, Mark Sinclair, David Wratt, Mike Uddstrom, Neil Gimson, and Martin Bell of New Zealand’s National Institute for Water and Atmospheric Research (NIWA) for assistance in gathering data, satellite images, and providing advice on using the RAMS and HYPACT models; Shane Cronin of Massey University for the ashfall data; Alan Seed of University of Auckland for a description of the radar images of the ash cloud; and Lori Glaze of NASA Goddard for the plume model. The first author thanks NIWA and the Foundation for Research Science and Technology (FRST) for supporting this work under the auspices of the FRST postdoctoral fellowship scheme under Contract C01638. The second author thanks the Earthquake Commission Research Foundation for support under Contract EQC 97/268. Last, we thank the three anonymous reviewers whose helpful comments and criticisms improved the quality of the paper.
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