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AGU journal highlights -- Sept. 3, 2008
Date:9/3/2008

g SGD important to phytoplankton and algae growth patterns and thus critical to healthy aquatic habitats. SGD has also been suggested as stimulating harmful algal blooms and as a pathway for pollution dispersion into the ocean. Noting that human populations are increasingly reliant on resources within coastal zones, Johnson et al. conducted airborne surveys using thermal infrared (TIR) sensors to determine how much SGD is escaping into the waters off the western side of the island of Hawaii. Groundwater is the only significant source of freshwater and new nutrients to this area's coastal ocean. The authors use TIR imagery to pinpoint input locations and detail fine-scale dispersal patterns of groundwater discharging as both diffuse flow and point-source plumes into the region's coastal zone. They further show how nutrient mixing trends can be integrated into TIR sea surface temperature to produce surface water nutrient maps.

Title: Aerial infrared imaging reveals large nutrient-rich groundwater inputs to the ocean

Authors: Adam G. Johnson and Craig R. Glenn: Department of Geology and Geophysics, School of Ocean and Earth Science and Technology, University of Hawaii, Honolulu, Hawaii, U.S.A.;

William C. Burnett and Richard N. Peterson: Department of Oceanography, Florida State University, Tallahassee, Florida, U.S.A.;

Paul G. Lucey: Hawaii Institute of Geophysics and Planetology, School of Ocean and Earth Science and Technology, University of Hawaii, Honolulu, Hawaii, U.S.A.

Source: Geophysical Research Letters (GRL) paper 10.1029/2008GL034574, 2008; http://dx.doi.org/10.1029/2008GL034574


5. Transient currents after lightning flashes

Within the Earth system, the ocean, land, and ionosphere are highly conductive. Conductivity of the atmosphere is low near sea level but increases rapidly with height up to the ionosphere. This dif
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Contact: Peter Weiss
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202-777-7507
American Geophysical Union
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