P. F. Schuster

P. F. Schuster
United States Geological Survey | USGS · DOI

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29
Publications
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642
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Publications

Publications (29)
Article
Changing climatic conditions in northern regions are causing perennially frozen soils (permafrost) to thaw. This thawing may have major implications for the cycling of carbon and metals, particularly mercury (Hg) in arctic and subarctic ecosystems. Hg is a ubiquitous pollutant that can impact aquatic resources and pose serious threat to human healt...
Conference Paper
Inland waters having seasonal ice cover accumulate carbon dioxide (CO2) and methane (CH4) during winter and degas during and following spring thaw. Springtime gas fluxes are particularly important to characterize for rivers because this is a time when they also receive large inputs of water having high dissolved gas concentrations from tributaries,...
Article
Mercury (Hg), a global pollutant, and Hg methylation is impacting aquatic resources and posing a serious potential threat to human health and aquatic biota. The Yukon River Basin (YRB) is the fourth largest drainage basin in North America (about twice the size of California) and the Yukon River has been defined as the largest free flowing river in...
Article
American Geophysical Union (AGU) Meeting, Dec 14-18, 2009, San Francisco, California. The Yukon River Basin (YRB), the fourth largest drainage basin in North America (about twice the size of California), offers unique opportunities to measure mercury (Hg) export from global atmospheric sources at the scale of a large river basin. The basin's vast...
Conference Paper
In situ measurements of chromophoric dissolved organic matter (CDOM) have become increasingly important as proxies for dissolved organic carbon (DOC) concentrations in studies where frequent discrete sampling of DOC concentrations is logistically difficult. Many studies employing this approach have found statistically significant positive correlati...
Conference Paper
Terrestrial uplands hold a large reservoir of legacy mercury (Hg) accumulated from decades of elevated anthropogenic deposition. The fate of this legacy Hg and new inputs of atmospheric Hg will affect the supply of Hg ultimately available for uptake in aquatic food webs, the primary exposure pathway to humans and wildlife through contaminated fish...
Article
An estimated 13 percent of the earth's land surface is covered by permafrost. Northern regions are experiencing permafrost degradation due to climate change which may have major implications for the cycling of carbon, nutrients, and metals, particularly mercury (Hg) in arctic and subarctic ecosystems. An organic- rich core of perennially frozen soi...
Article
Full-text available
Mercury and organic carbon concentrations vary dynamically in streamwater at the Sleepers River Research Watershed in Vermont, USA. Total mercury (THg) concentrations ranged from 0.53 to 93.8 ng/L during a 3-year period of study. The highest mercury (Hg) concentrations occurred slightly before peak flows and were associated with the highest organic...
Chapter
Online publication: USGS Open File Report 11977-2007
Chapter
Online publication: USGS Open File Report 11977-2007
Conference Paper
The Yukon River Basin, the fourth largest drainage basin in North America, provides a unique opportunity to study the interaction of mercury (Hg) and organic matter (OM) at a large scale in a relatively undisturbed system. The U.S. Geological Survey recently completed an extensive five-year water-quality study of the Yukon River from its headwaters...
Article
Full-text available
Understanding the microbial environment in permafrost areas is important for understanding processes that release carbon and other nutrients from soils as a result of permafrost melting. Soils were collected in August 2005 from two sites in the Yukon River Basin, Alaska, and examined for microbial diversity as part of a larger project to investigat...
Chapter
U.S. Geological Survey Open-File Report 2006-1228, pp. 134-138, (http://pubs.usgs.gov/of/2006/1228/)
Article
Approximately 13 percent of the Earth's land surface is currently underlain by permafrost, which is rapidly melting in some northern areas due to the effects of a warming climate. It is hypothesized that the resulting melt will release a large pool of sequestered organic carbon, nutrients, and metals within and from currently frozon soils. As part...
Conference Paper
Episodic fluxes of mercury during high flows at the headwater catchment at the Sleepers River Research Watershed in Vermont indicate that uplands are an important source of total mercury (Hg) to known downstream methylation sites (i.e. large wetlands). Methylmercury (MeHg) behavior in streamwater, soil water, and sediment porewater coupled with hig...
Conference Paper
Despite the potential for cold high-altitude ecosystems to act as sinks in the global mercury cycle, atmospheric deposition and fate of mercury have not been measured extensively at mountain sites in the Western United States. At Buffalo Pass in northwestern Colorado (the highest site in the national Mercury Deposition Network at 3234 m elevation),...
Article
A detailed study of the climatic significance of delta(18)O in precipitation was completed on a 1500 km southwest-northeast transect of the Tibetan Plateau in central Asia. Precipitation samples were collected at four meteorological stations for up to 9 years. This study shows that the gradual impact of monsoon precipitation affects the spatial var...
Conference Paper
The U.S. Geological Survey is conducting a five-year water quality study of a 3000 km reach of the Yukon River from its headwaters in the Yukon Territory, Canada to Pilot Station, Alaska near its mouth and just above tidal influence. The water quality of the Yukon River, the fourth largest river system in North America, is poorly documented and may...
Article
Although mercury (Hg) emissions peaked in the United States over the last 20 to 40 years and are now declining, they remain well above natural background levels in soils and sediments. Only a small fraction of the Hg deposited from the atmosphere to the terrestrial landscape runs off in streamflow. However, some of this Hg is methylated in the envi...
Article
Generally less than 20% of atmospherically deposited mercury is exported from watersheds in streamflow, but the mercury export that does occur is highly episodic. Our research from diverse landscapes in northern New England, including small forested, agricultural, and urban watersheds as well as some larger rivers discharging to Lake Champlain and...
Article
In the past, ice-core records from mid-latitude glaciers in alpine areas of the continental United States were considered to be poor candidates for paleoclimate records because of the influence of meltwater on isotopic stratigraphy. To evaluate the existence of reliable paleoclimatic records, a 160-m ice core, containing about 250 yr of record was...
Article
One hundred samples were collected from the surface of the Upper Fremont Glacier at equally spaced intervals defined by an 8,100 m2 snow grid to assess the significance of lateral variability in major-ion concentrations and del oxygen-18 values. For the major ions, the largest concentration range within the snow grid was sodium (0.5056 mg/l) and th...
Article
A chemical budget analysis for Williams Lake, Minnesota, tracks the seasonal progression of carbon inputs and outputs. CO, exchanges with the atmosphere reverse seasonally, with uptake by the lake in summer preceded and followed by larger losses to the atmosphere. Calcium bicarbonate-rich groundwaters seep steadily into the lake, augmented by remob...
Article
Full-text available
Acid precipitation and the dry deposition of sulfur dioxide (SO[sub 2]) accelerate damage to carbonate-stone monuments and building materials. This study identified and quantified environmental damage to a sample of Vermont marble during storms and their preceding dry periods. Results from field experiments indicated the deposition of SO[sub 2] gas...
Article
The Upper Fremont Glacier (UFG), a mid-latitude glacier in the Wind River Range, Wyoming, U.S.A., contains a record of atmospheric mercury deposition. Although some polar ice-core studies have provided a limited record of past mercury deposition, polar cores are, at best, proxy indicators of historic mercury deposition in the mid-latitudes. Two ice...

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