AGU journal highlights -- Sept. 3, 2008(hat within the basin is creating the dus...)

Date:9/3/2008

hat within the basin is creating the dust? Using data from NASA's Moderate Resolution Imaging Spectroradiometer, Bullard et al. analyze the spatial and temporal variability of dust sources in Lake Eyre Basin. They find that of 529 dust plumes detected, 37 percent originated from dunes and other windblown features, 30 percent originated from floodplains and other alluvial features, and 29 percent originated from ephemeral lakes (only 4 percent of dust plumes originated from the bed of ephemeral Lake Eyre itself). At this subbasin scale, the relative importance of different dust source areas varied primarily in response to sediment supply and availability and thus was not related to wind transport, suggesting that the Lake Eyre Basin is a supply-limited system. The authors expect that their method, if used for other basins, has the potential to bridge the gap between global modeling and field studies and will allow scientists to assess how dust emissions within a basin vary over time.

Title: Sub-basin scale dust source geomorphology detected using MODIS

Authors: Joanna Bullard and Matthew Baddock: Department of Geography, Loughborough University, Leicestershire, U.K.;

Grant McTainsh: Australian Rivers Institute, Griffith School of the Environment, Griffith University, Brisbane, Queensland, Australia;

John Leys: Department of Environment and Climate Change, Gunnedah, New South Wales, Australia

Source: Geophysical Research Letters (GRL) paper 10.1029/2008GL033928, 2008; http://dx.doi.org/10.1029/2008GL033928

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4. Infrared images reveal groundwater plumes off Hawaii coast

Although most freshwater entering the world's oceans comes from rivers, nutrient inputs into coastal environments via submarine groundwater discharge (SGD) are disproportionately large. Groundwaters typically contain high concentrations of dissolved chemicals, makin
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Contact: Peter Weiss pweiss@agu.org 202-777-7507 American Geophysical Union Source:Eurekalert

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