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Highlight IDTitleStrategic Program Area(s)YearStation
Photo of Composite critical load exceedance map for seven major vegetation types in California. The figure indicates areas where and by how much atmospheric nitrogen deposition is higher than the critical load (e.g., threshold) for risk of harmful ecological effects.  Forest Service
ID: 96
Air-Pollution Thresholds Protect Ecosystems

Research benefits air-quality specialists, land managers, scientists, and policymakers

Principal Investigator : Mark E. Fenn

Water, Air, and Soil2012PSW
Photo of
ID: 234
Development of Critical Loads and Critical Load Exceedance Maps for Protecting California Ecosystems from Atmospheric Nitrogen Deposition

More than 50,000 km2 of the land area in California receive atmospheric deposition inputs of at least 10 kg N/ha/yr. Many ecosystems are negativ ...

Principal Investigator : Mark E. Fenn

Water, Air, and Soil2010PSW
Photo of Passive samplers for air pollution in Athabasca Oil Sands Region. Forest Service
ID: 87
Industrial Air Pollution May Have Ecological Consequences

Elevated concentrations of ammonia can negatively impact lichen communities and elevated levels of nitrogen and sulfur deposition can potentiall ...

Principal Investigator : Mark E. Fenn

Water, Air, and Soil
Inventory and Monitoring
Photo of Class I and II Wilderness areas and lakes evaluated for acidification vulnerability. Glen Shaw, USDA Forest Service
ID: 680
Vulnerability of High Elevation Lakes of the Sierra Nevada to Atmospheric Acidic Deposition

In at least some years, hundreds of wilderness lakes are likely receiving acid loading in excess of their buffering capacity. The most vulnerabl ...

Principal Investigator : Mark E. Fenn

Water, Air, and Soil2014PSW