Sentences with phrase «atmospheric deposition»

This has led to a large decrease in sulfur emissions, and less atmospheric deposition of sulfate to agricultural fields, and consequently, declining sulfate concentrations in rivers.

It can attach to dust particles and rain out of the sky, in a process called atmospheric deposition.

Data will be analyzed to determine, where possible, baseline conditions to which changes in atmospheric deposition as well as chemical and biological changes can be detected and explained.

The concept of OA by anthropogenic CO2 suffices to accommodate the changes observed in the open ocean, where other perturbations such as atmospheric deposition of reactive sulfur and nitrogen play a minor role and where, perhaps with the exception of the Arctic Ocean, watershed perturbations are minimal.

A new study aims to debunk that idea by surveying atmospheric chemists who specialize in condensation trails and geochemists working on atmospheric deposition of dust and pollution.

Overall, dippers had higher mercury levels than most other songbirds tested in western North America, which may be due to more atmospheric deposition of mercury in snow at these high elevations.

In an upcoming paper, Max Bothwell, a scientist at Environment Canada, proposed that climate change is one of four factors — along with atmospheric deposition of nitrogen from fossil fuel burning — boosting the blooms.

Through atmospheric deposition, the chemicals move from the air to the Earth's surface.

«That balance is negative, with greater outputs from harvest and leaching, than inputs from atmospheric deposition and fertilizers, so what is missing is coming from the soil.

«Most of the studies about atmospheric deposition in sulfur have been in forested watersheds in the northeast where lakes were acidified, such as in the Adirondack Mountains in New York and in streams in the Appalachian Mountains, areas that were sensitive to acid rain.

The monitoring of the snowpack and acid sensitive lakes is designed to assess the linkages between atmospheric deposition and impacts on water quality.

Also, acidification in rivers and lakes is expected to increase as a result of acidic atmospheric deposition (Ferrier and Edwards, 2002; Gilvear et al., 2002; Soulsby et al., 2002).

The success of this strategy has been monitored using the long term National Atmospheric Deposition Program (NADP), which measures atmospheric deposition and studies its effects on the environment.

As atmospheric deposition grows more widespread, the difference between organic and nonorganic farming will become ever smaller.

Whereas these effects on open - ocean pH are calculated to be minor, they can be higher, at rates of 0.02 — 0.12 × 10 − 3 pH units per year (< 10 % of OA by anthropogenic CO2), in coastal ecosystems (Doney et al. 2007), where atmospheric deposition is intense and the waters can be more weakly buffered.

Estimating the natural background atmospheric deposition rate of mercury utilizing ombrotrophic bogs in southern Sweden

However, both sediment records of atmospheric deposition of Hg2 + species at high northern latitudes and atmospheric GEM concentrations inferred from Greenland firn air support the conclusion that transfer of anthropogenic inorganic mercury through the atmosphere to terrestrial and marine reservoirs occurs on a large scale.

«Especially in the more remote regions like northern Lake Michigan and Lake Superior, it's almost all atmospheric deposition.»

The flux of nutrients associated with this discharge consists of an annual median of three million tonnes of nitrogen, twenty thousand of phosphorus, and three million of silica, which represent a magnitude of inorganic nutrients comparable to that of external sources traditionally considered in marine studies, such as the atmospheric deposition and riverine runoff.

Watersheds tend to concentrate mercury through erosion of mineral deposits and atmospheric deposition.

«Fifty - four percent of that is fertilizer — the Haber - Bosch process; 11 percent is atmospheric deposition — the plus side of pollution; 18 percent is in situ fixation,» or nitrogen - fixing cover crops, like legumes, Sanchez said.

We present continuous 1772 — 2003 monthly and annually averaged deposition records for highly toxic thallium, cadmium, and lead from a Greenland ice core showing that atmospheric deposition was much higher than expected in the early 20th century, with tenfold increases from preindustrial levels by the early 1900s that were two to five times higher than during recent decades.

The biogeochemical impacts of this «fertilization» remain unclear, as direct oceanic observations of atmospheric deposition are limited and models often can not resolve the important processes.

It means that targets have to be established as increments or narrowing the gap between the desired level of atmospheric deposition and actual deposition.

Lake sediment (9, 10), peat bog (11, 12), and ice and snow (13, 14) records have been powerful tools to reconstruct past evolution of atmospheric deposition of Hg2 + species at specific locations, although their interpretation is still debated (15, 16).

Cycling within individual lake and transport from surrounding catchment soils may amplify or diminish the atmospheric deposition signal.

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.

The recent demonstration that an inadequate supply of iron limits primary production in this region supports earlier speculation that, in the past, fluctuations in the atmospheric deposition of iron - bearing dust may have driven large changes in productivity.