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Keyword: ozone

Effects of ozone and climate on ponderosa pine (Pinus ponderosa) growth in the Colorado Rocky Mountains

Publications Posted on: December 23, 2019
Long-term radial growth trends of ponderosa pine (Pinus ponderosa var. scopuforum) were studied in second-growth stands in the Front Range of the Colorado Rocky Mountains to determine if there has been any impact from oxidant air pollution. Although ozone concentrations are relatively high at some locations, visible pollutant injury was not found in any trees. Time series of basal area increments are generally homogeneous within stands.

Air quality at a snowmobile staging area and snow chemistry on and off trail in a Rocky Mountain subalpine forest, Snowy Range, Wyoming

Publications Posted on: August 18, 2016
A study was begun in the winter of 2000-2001 and continued through the winter of 2001-2002 to examine air quality at the Green Rock snowmobile staging area at 2,985 m elevation in the Snowy Range of Wyoming.

Effects of air pollution and climatic factors on Norway spruce forests in the Orlicke hory Mts. (Czech Republic), 1979-2014

Publications Posted on: August 18, 2016
The area of the Orlicke hory Mts. has been characterised by decline and disturbances of Norway spruce (Picea abies/L./Karst.) stands since the 1980s. Currently, only three permanent research plots have been preserved from the original sixteen established plots in this region.

Ozone air pollution threatens remote mountain landscapes

Science Spotlights Posted on: October 05, 2015
Ozone (O3) is the most widespread air pollutant and is highly toxic to vegetation. Station researchers are using a portable battery powered monitor to evaluate O3 at several high-elevation, remote locations in the Rocky Mountain West. Research findings will allow national forests to determine O3 levels in remote areas where Air Quality Related Values are unknown, determine if O3 at these sites exceed the federal standard, and examine long-term changes in O3 in remote regions.

Improved air-quality models help land managers and regulators

Science Spotlights Posted on: September 30, 2015
Wildland fires are a significant source of air pollutants. Researchers found that wildfires in the Interior Mountain West burn with a much lower combustion efficiency than prescribed fires. This finding means that for a given mass of vegetation burned, wildfires emit more fine particulate matter (PM2.5) and more non-methane organic compounds (NMOC) that lead to ozone (O3) formation.

Supplemental materials for: Ozone monitoring at remote sites using low-power instrumentation

Datasets Posted on: August 27, 2015
This is a supplement for Research Note RMRS-RN-65 "Ozone monitoring at remote sites using low-power instrumentation". Three versions of an enclosure containing datalogging, power supply, and environmental controls were developed to deploy low-power ozone analyzers in stand-alone installations that are automated, solar-powered, and pack-transportable.

Modeling coupled interactions of carbon, water, and ozone exchange between terrestrial ecosystems and the atmosphere

Publications Posted on: May 29, 2015
A new biophysical model (FORFLUX) is presented to study the simultaneous exchange of ozone, carbon dioxide, and water vapor between terrestrial ecosystems and the atmosphere. The model mechanistically couples all major processes controlling ecosystem flows trace gases and water implementing recent concepts in plant eco-physiology, micrometeorology, and soil hydrology.

Ozone monitoring at remote sites using low-power instrumentation

Publications Posted on: May 21, 2014
Collection of non-urban ambient ozone data at regional or larger scales (for example, Peake and Fong 1990; Bytnerowicz et al. 2004) is cost- and labor-intensive. Collection efforts are often further complicated by difficulty of access to data collection sites, the need for climate-controlled facilities to house instrumentation, and a requirement for a connection to utility-grade (grid) power.

Toward an ozone standard to protect vegetation based on effective dose: A review of deposition resistances and a possible metric

Publications Posted on: May 23, 2013
Present air quality standards to protect vegetation from ozone are based on measured concentrations (i.e., exposure) rather than on plant uptake rates (or dose). Some familiar cumulative exposure-based indices include SUM06, AOT40, and W126. However, plant injury is more closely related to dose, or more appropriately to effective dose, than to exposure.

Lichens, ozone, and forest health - exploring cross-indicator analyses with FIA data

Publications Posted on: July 20, 2009
Does air pollution risk represented by a lichen bioindicator of air pollution, an ozone bioindicator, or a combination of both, correlate with forest health as reflected by condition of tree crowns and other variables? We conducted pilot analyses to answer this question using Forest Inventory and Analysis (FIA) data from the Sierra Nevada region of California and the New England region; they have very different environments.