Sentences with phrase «mercury deposition»

The study finds leaf uptake of mercury to be a globally important pathway of atmospheric mercury deposition.

Recent declines in mercury concentration in a freshwater fishery: isolating the effects of de-acidification and decreased atmospheric mercury deposition in Little Rock Lake

And, mercury from coal - fired power plants is less than 1/2 of one percent (0.5 %) of total mercury depositions from all sources.

However, we estimate that oxidized mercury accounts for less than one - third of mercury deposition, and deposition by rain and snow for only 2 percent.

During this period, the states bordering the Gulf of Mexico have consistently seen the highest mercury deposition in the eastern U.S., typically double that of the northeast states.

We needed to measure mercury levels year - round in order to develop annual mercury deposition mass balances — estimates of how much mercury was entering the Arctic from different sources and where it goes.

The hot - spot standoff arises from big gaps in mercury science, according to environmental researchers, and the lack of comprehensive data on mercury deposition means that a consensus about emissions control will not likely emerge soon.

Millennial - scale records of atmospheric mercury deposition obtained from ombrotrophic and minerotrophic peatlands in the swiss Jura mountains

Although decreases in fish mercury have been reported recently for lakes exposed to reduced mercury deposition (53), other aquatic ecosystems may continue to bio-accumulate Hg due to higher anthropogenic emissions in the 1970s.

Atmospheric mercury deposition during the last 270 years: A glacial ice core record of natural and anthropogenic sources

Mercury levels in lakes respond rapidly (within years) to changes in mercury deposition directly to their surfaces, but much more slowly (in decades) to changing inputs to their watersheds (6).

In the Arctic, the record of atmospheric deposition of Hg2 + species in lake sediments exhibits a similar global trend as atmospheric GEM concentrations inferred from Greenland firn: lake sediments show an increase in mercury deposition which parallels increasing industrialization (see ref.

Some regions in the U.S., particularly those downwind of large sources of mercury, receive 60 - 80 % of their atmospheric mercury deposition from these human - made sources.

Conversely, current estimates are that less than half of all mercury deposition within the United States comes from American sources.

It has long been thought that atmospheric mercury deposition is predominantly by rainfall and snowfall, and monitoring networks measure mercury wet deposition worldwide.

The scientists found a geological record of the mercury deposition in Buchanan Lake sedimentary records.

Protects wildlife, habitats and ecosystem health from acid rain, nitrogen and mercury deposition.

Many factors affect fish mercury levels (5), and the response of fish methylmercury concentrations to changes in mercury deposition has been difficult to establish.