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Temporal and Spatial Variability of Freshwater Plumes in a Semienclosed Estuarine–Bay System

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Abstract

While the physical forcing mechanisms that govern the outflows of major rivers throughout the world are well documented in the literature, comparably less research has been done to examine the mechanisms that govern the contributions of small rivers and streams to coastal ocean systems. These rivers and streams provide a direct means for the transport of anthropogenic and terrigenous materials from watersheds to coastal oceans. This study describes the temporal and spatial variability of freshwater plumes from Kaneohe Stream, Hawaii, USA, after storm events in the Kaneohe Bay watershed. Freshwater plumes were examined using a combination of fixed moorings, synoptic shipboard surveys, and lagrangian surface drifters. Data sets were collected over the course of 19 months from August 2005 to March 2007 with particular attention paid to storms during the boreal winters. Stream discharge and duration were found to exert a primary control on plume persistence in the southern Kaneohe Bay system. Time series data show a strong coherence between wind forcing and surface currents, which, in combination with data derived from shipboard and aerial surveys, indicate that the spatial variability of freshwater plumes is primarily determined by atmospheric forcing.

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Acknowledgments

We wish to thank Brock Woodson and Brian McLaughlin for valuable assistance with field operations and data analysis, Yannis Papastamatiou, Rachel Solomon, Melinda Swanson, and Jeff Sevadjian for help with instrument deployment and recovery, Mike Rappé for generous use of instrumentation, Joe Reich for providing the Alyce C as a research platform, and the staff and management of the Hawaii Institute of Marine Biology for providing support for the field operations conducted during this study. We are most grateful to two anonymous reviewers for their insightful comments and suggestions that greatly improved the presentation and content of the paper. This paper is funded by a grant/cooperative agreement from the National Oceanic and Atmospheric Administration, Project no. R/EL-33, which is sponsored by the University of Hawaii Sea Grant College Program, SOEST, under Institutional Grant no. NA05OAR4171048 from NOAA Office of Sea Grant, Department of Commerce. The views expressed herein are those of the author(s) and do not necessarily reflect the views of NOAA or any of its subagencies. UNIHI-SEAGRANT-JC-06–14. This is contribution 7109 from the School of Ocean and Earth Science and Technology (SOEST), University of Hawaii at Manoa, Honolulu, HI, 96822, USA.

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Correspondence to Chris E. Ostrander.

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Ostrander, C.E., McManus, M.A., DeCarlo, E.H. et al. Temporal and Spatial Variability of Freshwater Plumes in a Semienclosed Estuarine–Bay System. Estuaries and Coasts: J CERF 31, 192–203 (2008). https://doi.org/10.1007/s12237-007-9001-z

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  • DOI: https://doi.org/10.1007/s12237-007-9001-z

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