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Short-term variation in thermal stratification complicates estimation of lake metabolism

Aquatic Sciences : Volume 73, Issue 1, February 2011

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Short-term variation in thermal stratification complicates estimation of lake metabolism

Content Provider	Springer Nature Link
Author	Coloso, James J. Cole, Jonathan J. Pace, Michael L.
Copyright Year	2010
Abstract	Previous studies have used sondes to measure diel changes in dissolved oxygen and thereby estimate gross primary production (GPP), ecosystem respiration (R), and net ecosystem production (NEP). Most of these studies estimate rates for the surface layer and require knowing the depth of the mixed layer (Zmix), which is usually determined from discrete daily or weekly temperature profiles. However, Zmix is dynamic, as the thermal structure of lakes may change at scales of minutes rather than days or weeks. We studied two thermally stratified lakes that exhibited intermittent microstratification in the mixed layer. We combined sonde-based estimates of metabolism with high-frequency measurements of stratification using thermistor chains to determine how the short-term dynamics of stratification affect metabolic rates. We calculated estimates of metabolism using time series of Zmix measured at seasonal, weekly, daily, and 5-min intervals. Areal rates of GPP and R were up to 24 and 29% less, respectively, using the 5-min measurements of Zmix rather than weekly Zmix, while NEP was not significantly different. These reduced areal rates are mostly the consequence of the reduction in the depth of the mixed layer. Microstratification occurred frequently in both lakes and affected volumetric rates in one lake where R was significantly lower, NEP was significantly higher, and GPP was marginally lower compared to days without microstratification. Hence, microstratification not only affects the depth of the mixed layer, but also alters the processes that influence photosynthesis and respiration. Future studies should consider microstratification and possibly employ multiple sondes with thermistor chains that enable integrating metabolic rates to a specific depth, rather than assuming a stable upper mixed layer as the basis for calculations.
Starting Page	305
Ending Page	315
Page Count	11
File Format	PDF
ISSN	10151621
Journal	Aquatic Sciences
Volume Number	73
Issue Number	2
e-ISSN	14209055
Language	English
Publisher	SP Birkhäuser Verlag Basel
Publisher Date	2010-12-07
Publisher Place	Basel
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Lake metabolism Gross primary production Respiration Net ecosystem production Stratification Ecology Freshwater & Marine Ecology Life Sciences Marine & Freshwater Sciences Oceanography
Content Type	Text
Resource Type	Article
Subject	Ecology Aquatic Science Water Science and Technology Ecology, Evolution, Behavior and Systematics

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