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Title: Estimating In Situ Phytoplankton Growth Rates with a Lagrangian Sampling Strategy Authored by: Hillmer, I.A. and Imberger, J. Abstract:
A new Lagrangian experimental design was used in a coastal area with the aim of estimating biogeochemical rate coefficients “in situ”. The experimental design consisted of a set of four drogues and a cross-transect sampling arrangement to capture the effect of the high transport and mixing rates and patchy distribution of species of interest in the study area. The concept of mass balance in an invariable control volume moving with a drogue proved to be able to isolate biogeochemical changes from the effect of physical changes due to advection, diffusion and con/div fluxes in the control volume. Values for primary production of 12 mg CL-1hr-1, carbon to chlorophyll ratio (C:Chla) equal to 109 and growth rate of 1.6 d-1 were obtained from measurements of dissolved oxygen and chlorophyll a. These results agreed with the highest values found in literature for the study site characteristics. The effect of scales of processes and patchiness is highlighted from this experiment and it showed that there has to be a compromise between size of sampling area, spatial arrangement and frequency for the sampling in order to capture the changes due to internal processes.
Reference: Hillmer, I.A. and Imberger, J., 2007, Estimating In Situ Phytoplankton Growth Rates with a Lagrangian Sampling Strategy, 5: 495-509 |
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