Type
Topic
Region
Year
Displaying 551 - 575 of 5834
Fire strongly influences carbon cycling and storage in boreal forests. In the near-term, if global warming occurs, the frequency and intensity of fires in boreal forests are likely to increase significantly. A sensitivity analysis on the relationship between fire and carbon…
Person:
Year: 1995
Type: Document
Source: FRAMES, TTRS
Topic(s): Climate, Emissions and Smoke, Fire Behavior, Fire Ecology, Fire Effects, Fire Occurrence, Models
Region(s): Alaska, International
Keywords: boreal forest, fire, carbon cycle, climate change, global warming, biomass, Canada, carbon, distribution, fire frequency, fire intensity, fire models, fire regimes, nutrient cycling, soil nutrients
An improved method to estimate the amounts of carbon released during fires in the boreal forest zone of Alaska in 1990 and 1991 is described. This method divides the state into 64 distinct physiographic regions and estimates areal extent of five different land covers: two forest…
Person:
Year: 1995
Type: Document
Source: FRAMES
Topic(s): Emissions and Smoke, Models
Region(s): Alaska
Keywords: fire, AVHRR images, carbon release, cover types, stand age distribution
Airborne and ground-based mixing ratio and flux measurements using eddy covariance (EC) and for the first time the mixed layer gradient (MLG) and mixed layer variance (MLV) techniques are used to assess the impact of isoprene and monoterpene emissions on atmospheric chemistry in…
Person:
Year: 2007
Type: Document
Source: FRAMES
Topic(s): Emissions and Smoke, Fire Effects
Region(s): International
Keywords: Amazon, proton transfer reaction mass, VOC - volatile organic carbon
Oxygenated volatile organic compounds (OVOC) can dominate atmospheric organic chemistry, but they are difficult to measure reliably at low levels in complex mixtures. Several techniques that have been used to speciate nonmethane organic compounds (NMOC) including OVOC were…
Person:
Year: 2004
Type: Document
Source: FRAMES
Topic(s): Emissions and Smoke, Fuels
Region(s): Alaska, California, Eastern, Great Basin, Hawaii, Northern Rockies, Northwest, Rocky Mountain, Southern, Southwest, National
Keywords: laboratory fires, biomass burning, OVOC - oxygenated volatile organic compounds, NMOC - nonmethane organic compounds
The NOAA 12 advanced very high resolution radiometer detected extensive forest fires in boreal Siberia and northern Mongolia during April through October 1998, a year of extremely dry weather, in particular, in the Russian Far East. Analysis of the satellite data has been…
Person:
Year: 2002
Type: Document
Source: FRAMES
Topic(s): Emissions and Smoke, Fire Effects, Mapping
Region(s): Alaska, International
Keywords: boreal forest, carbon, fire, biomass consumption, carbon release, radiometer, Siberia
Russian boreal forests are subject to frequent wildfires. The resulting combustion of large amounts of biomass not only transforms forest vegetation, but it also creates significant carbon emissions that total, according to some authors, from 35 to 94 Mt C per year. These carbon…
Person:
Year: 2002
Type: Document
Source: FRAMES
Topic(s): Emissions and Smoke, Models
Region(s): International
Keywords: boreal forest, carbon, fire damage, NDVI - Normalized Difference Vegetation Index, remote sensing, carbon emissions, Russia, satellite imagery
Boreal forest fires are highly variable in space and time and also have variable vertical injection properties. We compared a University of Maryland Chemistry and Transport Model (UMD-CTM) simulation of boreal forest fire CO in the summer of 2000 to surface observations from the…
Person:
Year: 2007
Type: Document
Source: FRAMES
Topic(s): Emissions and Smoke, Fire Effects
Region(s): Alaska
Keywords: boreal forest fire, international, CO emissions, CO transport, injection height, mid troposphere, MOPITT - Measurement of Pollution in the Troposphere instrument, UMD-CTM - University of Maryland Chemistry and Transport Model, upper troposphere
The quality of temporal information from daily burned area inputs was evaluated using a transport and chemistry experiment. Carbon monoxide emissions from boreal forest fires were estimated using burned area inputs with daily resolution. Averaging of emissions data to create 30-…
Person:
Year: 2007
Type: Document
Source: FRAMES
Topic(s): Emissions and Smoke, Fire Effects
Region(s): Alaska, International
Keywords: Canada, AVHRR - Advanced Very High Resolution Radiometer, Russia, international, boreal forest fires, CASN - Cooperative Air Sampling Network, CO emissions, MOPITT - Measurement of Pollution in the Troposphere instrument, UMD-CTM - University of Maryland Chemistry and Transport Model
Carbon monoxide reached record high levels in the northern extratropics in the late summer and fall of 1998 as a result of anomalously large boreal fires in eastern Russia and North America. We investigated the effects of these fires on CO and tropospheric oxidants using a…
Person:
Year: 2007
Type: Document
Source: FRAMES
Topic(s): Emissions and Smoke, Fire Effects
Region(s): Alaska, International
Keywords: Canada, boreal fire, CO - carbon monoxide, ozone, Russia, GEOS-Chem, injection altitude, PAN - peroxyacetyl nitrate, tropospheric oxidants
Small changes in C cycling in boreal forests can change the sign of their C balance, so it is important to gain an understanding of the factors controlling small exports like water-soluble organic carbon (WSOC) fluxes from the soils in these systems. To examine this, we…
Person:
Year: 2006
Type: Document
Source: FRAMES, TTRS
Topic(s): Climate, Emissions and Smoke, Fire Effects, Fuels
Region(s): Alaska
Keywords: carbon balance, productivity, soils, black spruce, climate change, DOC - dissolved organic carbon, Picea mariana, respiration, soil carbon, soil composition, water balance, soil properties, boreal forests, C - carbon, CO2 - carbon dioxide, climatology, coniferous forests, evapotranspiration, forest management, mineral soil, nutrient cycling, organic matter, organic soils, Picea spp., Picea mariana, soil management, soil moisture, soil nutrients, soil organic matter, soil temperature, statistical analysis, water
Changes in terrestrial carbon storage in the United States. 1: The roles of agriculture and forestry
Changes in the areas of croplands and pastures, and rates of wood harvest in 7 regions of the USA, including Alaska, were derived from historical statistics for the period 1700-1990. These rates of land-use change were used in a cohort model, together with equations defining the…
Person:
Year: 2000
Type: Document
Source: FRAMES, TTRS
Topic(s): Emissions and Smoke, Fire Behavior, Fire Ecology, Fire Effects, Fire Prevention, Models
Region(s): Alaska, California, Eastern, Great Basin, Hawaii, Northern Rockies, Northwest, Rocky Mountain, Southern, Southwest, National
Keywords: carbon flux, land use, vegetation, carbon accumulation, forest management, soil organic matter, agriculture, air quality, C - carbon, chaparral, coniferous forests, croplands, ecosystem dynamics, fire exclusion, fire suppression, grasslands, logging, second growth forests, slash, soil nutrients, soils, tillage, tundra, wildfires, wood
Fire is a major disturbance in the boreal forest, and has been shown to release significant amounts of carbon (C) to the atmosphere through combustion. However, less is known about the effects on ecosystems following fire, which include reduced productivity and changes in…
Person:
Year: 2003
Type: Document
Source: FRAMES
Topic(s): Emissions and Smoke, Fire Effects, Models
Region(s): Alaska, International
Keywords: boreal forest, Canada, combustion, decomposition, NDVI - Normalized Difference Vegetation Index, carbon release, primary production, satellite imagery
The effects of forest fire smoke on sky polarization and animal orientation are practically unknown. Using full-sky imaging polarimetry, we therefore measured the celestial polarization pattern under a smoky sky in Fairbanks, Alaska, during the forest fire season in August 2005…
Person:
Year: 2007
Type: Document
Source: FRAMES
Topic(s): Emissions and Smoke, Fire Ecology, Fire Effects
Region(s): Alaska, International
Keywords: Canada, British Columbia, animal orientation, forest fire smoke, sky polarization
Wildfires represent one of the most common disturbances in boreal regions, and have the potential to reduce C, N, and Hg stocks in soils while contributing to atmospheric emissions. Organic soil layers of the forest floor were sampled before and after the FROSTFIRE experimental…
Person:
Year: 2004
Type: Document
Source: FRAMES
Topic(s): Emissions and Smoke, Fire Ecology, Fire Effects
Region(s): Alaska
Keywords: boreal forest, carbon, combustion, N - nitrogen, soil, ash, black spruce, duff, experimental burn, FERA - Fire and Environmental Research Applications Team, Frostfire, Hg - mercury, feathermoss, soil properties
The Moderate Resolution Imaging Spectroradiometer (MODIS) instrument on the NASA Terra satellite has been used to monitor aerosol optical thickness (AOT, ?) daily at 10km+10km resolution worldwide since August 2000. This information, together with the locations of active fires…
Person:
Year: 2005
Type: Document
Source: FRAMES
Topic(s): Climate, Emissions and Smoke
Region(s): Alaska, International
Keywords: remote sensing, aerosols, land cover, NASA land cover, pollution, trend analysis, Africa, photometry, fires, seasonal variations
As a source of atmospheric carbon, biomass burning emissions associated with deforestation in the Amazon are globally significant. Once deforested, these lands continue to be sources of substantial burning emissions for many years due to frequent pasture burning. The objective…
Person:
Year: 2004
Type: Document
Source: FRAMES
Topic(s): Emissions and Smoke, Models, Prescribed Fire
Region(s): International
Keywords: carbon, land use, Amazon, Brazil, Rondonia, trace gas emissions, regenerating forest, biomass burning, land-cover change, pasture, primary forest
Boreal and subarctic peatlands comprise a carbon pool of 455 Pg that has accumulated during the postglacial period at an average net rate of 0.096 Pg/yr (1 Pg = 1015g). Using Clymo's (1984) model, the current rate is estimated at 0.076 Pg/yr. Longterm drainage of these peatlands…
Person:
Year: 1991
Type: Document
Source: FRAMES
Topic(s): Climate, Emissions and Smoke
Region(s): Alaska
Keywords: biomass, boreal, carbon cycle, CH4 - methane, climate warming, CO2 - carbon dioxide, greenhouse effect, mires, peatlands, sub-arctic
We used an airborne Fourier transform infrared spectrometer (AFTIR), coupled to a flow-through, air-sampling cell, on a King Air B-90 to make in situ trace gas measurements in isolated smoke plumes from four, large, boreal zone wildfires in interior Alaska during June 1997.…
Person:
Year: 2000
Type: Document
Source: FRAMES
Topic(s): Climate, Emissions and Smoke, Fire Effects, Monitoring and Inventory
Region(s): Alaska
Keywords: climate change, AFTIR - airborne Fourier transform infrared spectroscopy, trace gas emissions, boreal forest fires, smoke plumes, airborne measurements, smoke monitoring
Fire behavior was measured and modeled from eight 1 ha experimental plots located in the Francis Marion National Forest, South Carolina, during prescribed burns on February 12 and February 20, 2003. Four of the plots had been subjected to mechanical chipping during 2002 to…
Person:
Year: 2006
Type: Document
Source: FRAMES, TTRS
Topic(s): Climate, Emissions and Smoke, Fire Behavior, Fire Effects, Fire Prevention, Fuels, Hazard and Risk, Models, Prescribed Fire, Safety, Social Science, Weather, Wildland-Urban Interface (WUI)
Region(s): Southern
Keywords: land management, fuel treatments, mechanical chipping, Acer rubrum, Clethra alnifolia, coastal plain, experimental fire, fine fuels, fire hazard reduction, fire intensity, fire management, flame length, forbs, forest management, fuel loading, fuel management, fuel moisture, grasses, heavy fuels, Ilex glabra, Liquidambar styraciflua, litter, low intensity burns, moisture, national forests, particulates, population density, Pinus taeda, Quercus nigra, Quercus phellos, rate of spread, Schizachyrium scoparium, SFP - Southern Fire Portal, shrubs, site treatments, snags, South Carolina, storms, understory vegetation, Vaccinium spp., wildfires, wind, woody plants
This study analyzes spatial and temporal variability of emissions from wildland fires across the contiguous US. The emissions are estimates based on a recently constructed dataset of historical fire records collected by multiple US governmental agencies. Both wildfire and…
Person:
Year: 2004
Type: Document
Source: FRAMES
Topic(s): Emissions and Smoke, Fire Effects, Prescribed Fire
Region(s): Alaska, California, Eastern, Great Basin, Hawaii, Northern Rockies, Northwest, Rocky Mountain, Southern, Southwest, National
Keywords: air pollution, PM - particulate matter
The area burned by forest fires in Canada has increased over the past four decades, at the same time as summer season temperatures have warmed. Here we use output from a coupled climate model to demonstrate that human emissions of greenhouse gases and sulfate aerosol have made a…
Person:
Year: 2004
Type: Document
Source: FRAMES
Topic(s): Climate, Emissions and Smoke, Fire Effects, Social Science
Region(s): Alaska, International
Keywords: Canada, greenhouse gas emissions, greenhouse gases, human induced climate change, increased temperatures
Description not entered.
Person:
Year: 2005
Type: Document
Source: FRAMES
Topic(s): Emissions and Smoke, Fire Effects
Region(s): Unknown
Keywords: fire disturbance, greenhouse gas emissions, permafrost
We studied an upland boreal forest plot located in the Prince Albert National Park, Saskatchewan, Canada, to measure the total mercury content in vegetation and organic soil with a view to assessing the potential for mercury release during forest fires. The study area consists…
Person:
Year: 2007
Type: Document
Source: FRAMES
Topic(s): Emissions and Smoke, Fire Effects
Region(s): International
Keywords: boreal forest, Canada, fire severity, vegetation, Hg - mercury, Prince Albert National Park, Saskatchewan, forest fires, organic soil layers, total mercury content
The uncertainty in carbon emissions from fire was estimated for the boreal region of Alaska over the 50 years of recorded wildfire. Building on previous work where carbon emissions were estimated using a geographic information systems-based model, the uncertainty attached to the…
Person:
Year: 2004
Type: Document
Source: FRAMES
Topic(s): Climate, Emissions and Smoke, Fire Effects
Region(s): Alaska
Keywords: boreal forest, carbon cycling, Monte Carlo simulations, biomass burning
A study was carried out to assess the variability in trace gas emission from several factors and to estimate the immediate impact of fire on carbon exchange. Using geospatial data, a model of emission was developed for three carbon-based gases, CO2, CO, and CH4, released during…
Person:
Year: 2002
Type: Document
Source: FRAMES
Topic(s): Climate, Emissions and Smoke, Fire Effects
Region(s): Alaska
Keywords: boreal forest, carbon, wildfire, gases