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JOURNAL OF PLANKTON RESEARCH | VOLUME 18 | NUMBER 5 | PAGES 767-788 | 1996
© Oxford University Press

research-article

On using a Lagrangian model to calibrate primary production determined from in vitro incubation measurements

W. Barkmann and J.D. Woods1

Southampton Oceanography Centre, Oceanography Department Southampton SO14 3ZH 1Earth Resources Engineering Department, Imperial College London, UK

Received on June 28, 1995; accepted on December 22, 1995 This paper discusses an observing system simulation experiment which reveals the difference in primary production of (i) phytoplankton moving freely in the turbulent mixed layer of the upper ocean and (ii) a sample of the same population held in a bottle at fixed depths. The results indicate the tendency of incubation measurements to overestimate phytoplankton production rates by up to 40%. Differences in primary production depend to a first approximation on the vertical extent of mixing and on water turbidity. A simple model was constructed leading to a non-linear calibration function which relates the difference in primary production to surface irradiance, mixing depth and to the depth of the euphotic zone. This function has been applied to calibrate the production rates simulated at fixed depths, and the corrected values were verified by comparisons with productivities in the turbulent environment. The calibration function was found to be capable of reducing the differences significantly.


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