Abstract #301412

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JSM 2002 Abstract #301412
Activity Number: 70
Type: Contributed
Date/Time: Monday, August 12, 2002 : 8:30 AM to 10:20 AM
Sponsor: Section on Statistics & the Environment*
Abstract - #301412
Title: A Correction for Quenching Bias in Chlorophyll Fluorescence Measurements
Author(s): Leah Welty*+ and Michael Stein and Barry Lesht
Affiliation(s): University of Chicago and University of Chicago and Argonne National Laboratory
Address: 5734 S. University Ave., Chicago, Illinois, 60637, USA
Keywords: spatial statistics ; physical model ; calibration ; bias correction ; ecology
Abstract:

Phytoplankton are important elements of lake and ocean ecosystems: they are the base of aquatic and oceanic food chains and may affect global climate through fixation of atmospheric carbon by photosynthesis. Measurements of phytoplankton populations often are indirect, based on measurements of in situ chlorophyll concentrations. One of the most tenable and popular methods of chlorophyll measurement, chlorophyll fluorescence, suffers from a sometimes large "quenching" bias in the presence of solar radiation. Because taking measurements during low or no light conditions is limited in practice, we propose a physical model to correct for the quenching bias. This model will be applied to chlorophyll fluorescence data from Lake Michigan; fitting procedures, parameter estimates, and physical interpretations will be discussed.

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Revised March 2002