Aquatic Sciences Meeting, Albuquerque 2001

PC07 Spatial and Temporal Connections

Date: Wednesday, February 14, 2001

Location: Southwest Hall

Nihongi, A, , University of Wisconsin-Milwaukee, Milwaukee, USA, anihongi@uwm.edu

Seuront, L, , Tokyo University of Fisheries, Tokyo, Japan,

Yamazaki, H, , Tokyo University of Fisheries, Tokyo, Japan,

VERTICAL BIO-PHYSICAL MICROSTRUCTURES OF PHYTOPLANKTON BIOMASS AND PARTICLES DISTROBUTIONS IN TIDALLY MIXED COASTAL WATERS

In order to investigate the microscale physical-biological interactions of the marine ecosystem functioning, we have recorded high resolution (256 Hz) vertical profiles of turbulent velocity shear, temperature, salinity, in vivo fluorescence and turbidity in tidally mixed area of Seto-Inland Sea (Japan) using a new microstructure free-fall profiler, TurbMAP (Turbulence-Microstructure Acquisition Profiler). As a result, in vivo fluorescence does not show any significant associations with physical structures, and it seems that only high/low chlorophyll a concentration water conveyed by tidal current can affect in vivo fluorescence. On the other hand, turbidity is strongly influenced by hydrodynamic and hydrographical structures, especially tidal advection and mixing which can transport bottom sediment to upper water column. Namely, the fine-scale patterns of fluorescence and turbidity distributions are respectively independent and dependent on the low-frequency hydrographical structure of the observation site. However, our results exhibit that micro-scale patterns of both phytoplankton biomass and particles distributions are independent on their high-frequency hydrographic and hydrodynamic environment.

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Aquatic Sciences Meeting, Albuquerque 2001

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