CS08 Biogeochemical Cycles
Date: Tuesday, June 11, 2002
Location: Poster Session - VCC
 
DeGrandpreMD, University of Montana, Missoula, USA, mdegrand@selway.umt.edu
Beatty, C, M, University of Montana, Missoula, USA, 
Baehr, M, M, University of Montana, Missoula, USA, 
Reynolds, J, C, University of Montana, Missoula, USA, 
Hammar, T, R, Woods Hole Oceanographic Institution, Woods Hole, USA, 
 
BIOGEOCHEMICAL CYCLES IN AQUATIC ECOSYSTEMS: STUDIES USING IN SITU SENSORS
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Aquatic scientists dream of the day when real-time 3-D maps of their favorite biogeochemical parameter will be teleported to their desktop computer with the push of a button. Recent technological developments have chipped away at this frontier, making it possible to obtain at least 1-D biogeochemical information in real-time. One of our research goals has been to obtain continuous in situ CO2 measurements (and related parameters) to improve our understanding of CO2 cycling in aquatic ecosystems. To accomplish this goal, we have developed in situ sensors for pCO2 (the partial pressure of CO2) and pH and have utilized the sensors in a number of different settings. In this presentation we will discuss recent results from sensor deployments in a local lake and river. In the lake study we characterized CO2 and O2 variability during ice-cover, turnover and stratification. The river study utilized upstream and downstream sensor arrays to obtain rates of change between the two sites. In both studies modeling was used to quantify the processes controlling the gas variability. Comparison between the modeled pCO2 and O2 time-series permitted an internal check on the validity of the models. We provide an overview of these field studies and suggest future strategies for mooring-based biogeochemical research.