HR: 14:40h
AN: OS33D-05    [Abstracts]
TI: A Sulfur Hexafluoride-Based Lagrangian Study on Initiation and Accumulation of the Red Tide {\it Cochlodinium} in Southern Coastal Waters of Korea
AU: * Park, G
EM: pgh3715@postech.ac.kr
AF: Pohang University of Science and Technology, School of Environmental Science and Engineering, Pohang, 790-784 Korea, Republic of
AU: Lee, K
EM: ktl@postech.ac.kr
AF: Pohang University of Science and Technology, School of Environmental Science and Engineering, Pohang, 790-784 Korea, Republic of
AU: Koo, C
EM: sf6@postech.ac.kr
AF: Pohang University of Science and Technology, School of Environmental Science and Engineering, Pohang, 790-784 Korea, Republic of
AU: Lee, C
EM: cklee@nfrda.re.kr
AF: National Fisheries Research and Development Institute, Ocean and Marine Environmental Department, Busan, 619-920 Korea, Republic of
AU: Koo, J
EM: kkamdol@pusan.ac.kr
AF: Pusan National University, Department of Marine Science, Busan, 609-735 Korea, Republic of
AU: Lee, T
EM: tlee@pusan.ac.kr
AF: Pusan National University, Department of Marine Science, Busan, 609-735 Korea, Republic of
AU: Ahn, S
EM: mini404@lycos.co.kr
AF: National Fisheries Research and Development Institute, Ocean and Marine Environmental Department, Busan, 619-920 Korea, Republic of
AU: Kim, H
EM: hgkim49@momaf.go.kr
AF: National Fisheries Research and Development Institute, Ocean and Marine Environmental Department, Busan, 619-920 Korea, Republic of
AB: During the last two decades, massive accumulations of autotrophic algae and some heterotrophic protists, collectively referred to as harmful algal blooms (HABs), have increased considerably in frequency, size, and cell density across the globe. Several field studies suggest increasing eutrophication as the primary reason for the increases in the blooms; however, strong evidence for this relation is not yet available, largely due to the ephemeral and complex nature of HABs. Here we report the first continuous in situ measurements of a population of the HAB species {\it C. polykrikoides} in a fixed volume of inshore waters near the island of Naro-do (34.47$\deg$N and 127.55$\deg$W), an area that lies off the southern coast of Korea and where the first bloom of {\it C. polykrikoides} has occurred at least for each of the past five years. This Lagrangian experiment was carried out by injecting the inert chemical tracer sulfur hexafluoride (SF$_{6}$) into a patch of seawater carrying {\it C. polykrikoides} and tracking the SF$_{6}$-labeled water mass for 4 days. Our results suggest that bloom initiation and much of the cell accumulation in the early phase of the bloom are due to the input of {\it C. polykrikoides} cells from a shoreward movement of alongshore currents.
DE: 4845 Nutrients and nutrient cycling
DE: 4853 Photosynthesis
DE: 4855 Plankton
DE: 4894 Instruments and techniques
DE: 4235 Estuarine processes
SC: Ocean Sciences [OS]
MN: 2004 AGU Fall Meeting