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Glacial melting may release pollutants in the environment
October 22, 2009Those pristine-looking Alpine glaciers now melting as global warming sets in may explain the mysterious increase in persistent organic pollutants in sediment from certain lakes since the 1990s, despite decreased use of those compounds in pesticides, electric equipment, paints and other products. That's the conclusion of a new study, scheduled for the Nov. 1 issue of ACS' Environmental Science & Technology, a semi-monthly journal.
In the study, Christian Bogdal and colleagues focused on organic pollutants in sediment from a model body of water -- glacier-fed Lake Oberaar in the Bernese Alps, Switzerland -- testing for the persistent organic pollutants, including dioxins, PCBs, organochlorine pesticides and synthetic musk fragrances. They found that while contamination decreased to low levels in the 1980s and 1990s due to tougher regulations and improvements in products, since the late 1990s flow of all of these pollutants into the lake has increased sharply. Currently, the flow of organochlorines into the lake is similar to or even higher than in the 1960s and 1970s, the report states.
The study attributed the most recent spike in the flow of pollutants into Lake Oberaar to the accelerated release of organic chemicals from melting Alpine glaciers, where contaminants were deposited earlier and preserved over decades. "Considering ongoing global warming and accelerated massive glacial melting predicted for the future, our study indicates the potential for environmental impacts due to pollutants delivered into pristine mountainous areas," Bogdal said.
American Chemical Society
American Chemical Society
Organic Pollutants Current Events and Organic Pollutants News RSSAir pollutants from abroad a growing concern, says new report
Plumes of harmful air pollutants can be transported across oceans and continents -- from Asia to the United States and from the United States to Europe -- and have a negative impact on air quality far from their original sources, says a new report by the National Research Council.
New study ranks 'hotspots' of human impact on coastal areas
Coastal marine ecosystems are at risk worldwide as a result of human activities, according to scientists at UC Santa Barbara who have recently published a study in the Journal of Conservation Letters.
Study shows transfer of heavy metals from water to fish in Huelva estuary
A team of researchers from the University of Cadiz has confirmed that zinc, copper and lead are present at high levels in the water and sediments of the Huelva estuary, and have studied how some of these heavy metals are transferred to fish.
Study shows maritime shipping makes hefty contribution to air pollution
Commercial ships emit almost half as much particulate pollutants into the air globally as the total amount released by the world's cars, according to a new study led by the National Oceanic and Atmospheric Administration and the University of Colorado at Boulder.
Commercial ships spew half as much particulate pollution as world's cars
Globally, commercial ships emit almost half as much particulate pollution into the air as the total amount released by cars, according to a new study. Ship pollutants affect both the Earth's climate and the health of people living along coastlines.
Newly described contaminant sources in Katrina-flooded homes pose health risks
Post-Katrina flooded homes may contain harmful levels of contaminants in addition to sediment deposits. Indoor gases, mold films, and aerosols may also have exposed residents, first responders, and demolition crews to dangerous contaminant levels without the need for direct skin contact.
Massive greenhouse gases may be released as destruction, drying of world wetlands worsens: UN
Leading world scientists convene in Brazil July 21-25 amid growing concern that evaporation and ongoing destruction of world wetlands, which hold a volume of carbon similar to that in the atmosphere today, could cause them to exhale billows of greenhouse gases.
Environmental pollutant has sex-skewing effect
Women exposed to high levels of PCBs (polychlorinated biphenyls - a group of banned environmental pollutants) are less likely to give birth to male children.
UNH Researchers Test Sediment-Scrubbing Technology In Cocheco River
In a mud flat at the edge of the Cocheco River, just outside downtown Dover, scientists from the University of New Hampshire's Contaminated Sediments Center are testing an innovative way to treat polluted sediment in coastal waterways.
Persistent Man-made Chemical Pollutants Found in Deep-sea Octopods and Squids
New evidence that chemical contaminants are finding their way into the deep-sea food web has been found in deep-sea squids and octopods, including the strange-looking "vampire squid". These species are food for deep-diving toothed whales and other predators.
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