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AGU journal highlights -- July 16, 2013
Date:7/16/2013

describe the spatial patterns of ebullition in three thermokarst lakes in different regions of Alaska. The authors used these models to create simulated ebullition data sets, on which they tested various methods for estimating lake ebullition. They find that the standard method of measuring ebullition with randomly placed bubble traps is biased toward underestimating methane flux, while a method using survey transects to map ebullition bubbles trapped in lake ice only slightly underestimated methane flux. The authors suggest that transect field data from a large number of widely distributed lakes can be combined to give a good estimate of regional lake ebullition.

Source: Journal of Geophysical Research-Biogeosciences, doi:10.1002/jgrg.20087, 2013 http://onlinelibrary.wiley.com/doi/10.1002/jgrg.20087/abstract

Title: Constraining spatial variability of methane ebullition seeps in thermokarst lakes using point process models

Authors: Katey M. Walter Anthony and Peter Anthony: Water and Environmental Research Center, University of Alaska Fairbanks.


3. Low-cost solution optimizes water quality of reservoir effluent

A large reservoir can provide reliable access to water, control flooding, and be used to generate hydroelectricity. On the other hand, large dams can upset local ecosystems by changing river flow patterns or by affecting nutrient and oxygen concentrations in downstream flows. Damming a river and constructing a reservoir requires balancing these benefits and risks.

In tropical reservoirs, water often becomes highly stratified, with nutrient-depleted but well-oxygenated upper layers and nutrient-rich but oxygen-depleted waters at depth. When water is let out of the reservoir to power turbines or stave off drought, its quality has consequences for life downstream.

Engineers p
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Contact: Mary Catherine Adams
mcadams@agu.org
202-777-7530
American Geophysical Union
Source:Eurekalert

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