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https://www.readbyqxmd.com/read/28548841/light-absorption-by-brown-carbon-in-the-southeastern-united-states-is-ph-dependent
#1
Sabrina M Phillips, Aleia D Bellcross, Geoffrey D Smith
Light-absorbing organic material, or "brown carbon" (BrC), can significantly influence the effect that aerosols have on climate. Here, we investigate how changing pH affects the absorption spectra of water-soluble BrC from ambient particulate matter smaller than 2.5 μm collected in Athens, Georgia, in the spring and fall of 2016, including samples from nearby wildfires. We find that absorption increases 10% per pH unit from pH 2 to pH 12 with a broad, featureless tail at visible wavelengths, where the largest fractional increase is also observed...
May 26, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28546560/potential-decline-in-carbon-carrying-capacity-under-projected-climate-wildfire-interactions-in-the-sierra-nevada
#2
Shuang Liang, Matthew D Hurteau, Anthony LeRoy Westerling
Ecosystem carbon carrying capacity (CCC) is determined by prevailing climate and natural disturbance regimes, conditions that are projected to change significantly. The interaction of changing climate and its effects on disturbance regimes is expected to affect forest regeneration and growth, which may diminish forest carbon (C) stocks and uptake. We modeled landscape C dynamics over 590 years along the latitudinal gradient of the U.S. Sierra Nevada Mountains under climate and area burned by large wildfires projected by late 21(st) century...
May 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28538249/norovirus-and-clostridium-difficile-outbreaks-squelching-the-wildfire
#3
Ann Fisher, Louise M Dembry
PURPOSE OF REVIEW: Gastrointestinal outbreaks in the healthcare setting cause increased morbidity and mortality in an already vulnerable population. Optimization of infection prevention measures can be a challenge in healthcare settings. This review describes new literature that may change the traditional infection prevention approach to such outbreaks. RECENT FINDINGS: Asymptomatic carriers of both norovirus and Clostridium difficile can pose risk of transmission to others and the environment...
May 22, 2017: Current Opinion in Infectious Diseases
https://www.readbyqxmd.com/read/28525551/who-among-the-elderly-is-most-vulnerable-to-exposure-and-health-risks-of-pm2-5-from-wildfire-smoke
#4
Jia Coco Liu, Ander Wilson, Loretta J Mickley, Keita Ebisu, Melissa P Sulprizio, Yun Wang, Roger D Peng, Xu Yue, Francesca Dominici, Michelle L Bell
Wildfires burn over 7 million US acres annually, according to the US Forest Service. Little is known regarding which subpopulations are more vulnerable to health risks from wildfire smoke, including fine particles. We estimated exposure to fine particles specifically from wildfires and associations between wildfire-specific fine particles and respiratory hospital admissions for subpopulations > 65 years in the Western US (2004-2009). Higher fractions of Blacks and people in urban counties and in California are exposed to > 1 smoke wave (high-pollution episodes from wildfire smoke) compared to other populations...
May 19, 2017: American Journal of Epidemiology
https://www.readbyqxmd.com/read/28521386/remobilisation-of-industrial-lead-depositions-in-ash-during-australian-wildfires
#5
Liqin Wu, Mark Patrick Taylor, Heather K Handley
This study examined the recycling of lead (Pb) in ash from wildfires, its source and potential contribution to environmental contamination. Ash from wildfires was collected from four Australian sites following uncontrolled fires during 2012 to 2013 close to major urban populations in Sydney (New South Wales), Hobart (Tasmania) and Adelaide (South Australia). The samples were analysed for their total Pb concentration and Pb isotopic composition to determine the sources of Pb and the extent, if any, of industrial contamination and its recycling into the ecosystem...
May 14, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28501609/return-on-investment-from-fuel-treatments-to-reduce-severe-wildfire-and-erosion-in-a-watershed-investment-program-in-colorado
#6
Kelly W Jones, Jeffery B Cannon, Freddy A Saavedra, Stephanie K Kampf, Robert N Addington, Antony S Cheng, Lee H MacDonald, Codie Wilson, Brett Wolk
A small but growing number of watershed investment programs in the western United States focus on wildfire risk reduction to municipal water supplies. This paper used return on investment (ROI) analysis to quantify how the amounts and placement of fuel treatment interventions would reduce sediment loading to the Strontia Springs Reservoir in the Upper South Platte River watershed southwest of Denver, Colorado following an extreme fire event. We simulated various extents of fuel mitigation activities under two placement strategies: (a) a strategic treatment prioritization map and (b) accessibility...
May 11, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28500791/fire-catalyzed-rapid-ecological-change-in-lowland-coniferous-forests-of-the-pacific-northwest-over-the-past-14-000-years
#7
Shelley D Crausbay, Philip E Higuera, Douglas G Sprugel, Linda B Brubaker
Disturbance can catalyze rapid ecological change by causing widespread mortality and initiating successional pathways, and during times of climate change, disturbance may contribute to ecosystem state changes by initiating a new successional pathway. In the Pacific Northwest of North America (PNW), disturbance by wildfires strongly shapes the composition and structure of lowland forests, but understanding the role of fire over periods of climate change is challenging, because fire-return intervals are long (e...
May 13, 2017: Ecology
https://www.readbyqxmd.com/read/28498778/seasonal-ambient-particulate-matter-and-population-health-outcomes-among-communities-impacted-by-road-dust-in-british-columbia-canada
#8
Kris Y Hong, Gavin H King, Arvind Saraswat, Sarah B Henderson
In recent years, many air quality monitoring programs have favoured measurement of particles less than 2.5 microns (PM2.5) over particles less than 10 microns (PM10) in light of evidence that health impacts are mostly from the fine fraction. However, the coarse fraction (PM10-2.5) may have independent health impacts that support continued measurement of PM10 in some areas, such as those affected by road dust. The objective of this study was to evaluate the associations between different measures of daily PM exposure and two daily indicators of population health in seven communities in British Columbia, Canada, where road dust is an ongoing concern...
May 12, 2017: Journal of the Air & Waste Management Association
https://www.readbyqxmd.com/read/28497785/charcoal-evidence-that-rising-atmospheric-oxygen-terminated-early-jurassic-ocean-anoxia
#9
Sarah J Baker, Stephen P Hesselbo, Timothy M Lenton, Luís V Duarte, Claire M Belcher
The Toarcian Oceanic Anoxic Event (T-OAE) was characterized by a major disturbance to the global carbon(C)-cycle, and depleted oxygen in Earth's oceans resulting in marine mass extinction. Numerical models predict that increased organic carbon burial should drive a rise in atmospheric oxygen (pO2) leading to termination of an OAE after ∼1 Myr. Wildfire is highly responsive to changes in pO2 implying that fire-activity should vary across OAEs. Here we test this hypothesis by tracing variations in the abundance of fossil charcoal across the T-OAE...
May 12, 2017: Nature Communications
https://www.readbyqxmd.com/read/28493884/non-linear-growth-in-tree-ferns-dicksonia-antarctica-and-cyathea-australis
#10
David P Blair, Wade Blanchard, Sam C Banks, David B Lindenmayer
Tree ferns are an important structural component of forests in many countries. However, because their regeneration is often unrelated to major disturbances, their age is often difficult to determine. In addition, rates of growth may not be uniform, which further complicates attempts to determine their age. In this study, we measured 5 years of growth of Cyathea australis and Dicksonia antarctica after a large wildfire in 2009 in south-eastern Australia. We found growth rates of these two species were unaffected by aspect and elevation but slope had a minor effect with D...
2017: PloS One
https://www.readbyqxmd.com/read/28493694/community-vulnerability-to-health-impacts-of-wildland-fire-smoke-exposure
#11
Ana G Rappold, Jeanette M Reyes, George Pouliot, Wayne E Cascio, David Diaz-Sanchez
Identifying communities vulnerable to adverse health effects from exposure to wildfire smoke may help prepare responses, increase the resilience to smoke and improve public health outcomes during smoke days. We developed a Community Health-Vulnerability Index (CHVI) based on factors known to increase the risks of health effects from air pollution and wildfire smoke exposures. These factors included county prevalence rates for asthma in children and adults, chronic obstructive pulmonary disease, hypertension, diabetes, obesity, percent of population 65 years of age and older, and indicators of socioeconomic status including poverty, education, income and unemployment...
May 11, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28491321/thermotolerance-capacities-of-native-and-exotic-coastal-plants-will-lead-to-changes-in-species-composition-under-increased-heat-waves
#12
Kris French, Sharon A Robinson, Jodie Lia
With an increase in the frequency and intensity of extreme heat events, plants are likely to reach their thermal limits and show slower growth or increased mortality. We investigated differences amongst coastal native and invasive shrubs and grasses to investigate if particular species might be more at risk in the future. Using an ecologically relevant experimental set of heat waves over a month, we assessed changes in biomass and photosynthetic efficiency in a laboratory setting using 25 coastal Australian species divided into native and exotic shrubs, and native and exotic grasses...
2017: Conservation Physiology
https://www.readbyqxmd.com/read/28464444/shifting-pacific-storm-tracks-as-stressors-to-ecosystems-of-western-north-america
#13
Matthew P Dannenberg, Erika K Wise
Much of the precipitation delivered to western North America arrives during the cool season via midlatitude Pacific storm tracks, which may experience future shifts in response to climate change. Here, we assess the sensitivity of the hydroclimate and ecosystems of western North America to the latitudinal position of cool-season Pacific storm tracks. We calculated correlations between storm track variability and three hydroclimatic variables: gridded cool-season standardized precipitation-evapotranspiration index, April snow water equivalent, and water year streamflow from a network of USGS stream gauges...
May 2, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28446229/expanding-protection-motivation-theory-investigating-an-application-to-animal-owners-and-emergency-responders-in-bushfire-emergencies
#14
Rachel Westcott, Kevin Ronan, Hilary Bambrick, Melanie Taylor
BACKGROUND: Protection Motivation Theory (PMT) was developed by Rogers in 1975, to describe how individuals are motivated to react in a self-protective way towards a perceived health threat. Rogers expected the use of PMT to diversify over time, which has proved true over four decades. The purpose of this paper is to explore how PMT can be used and expanded to inform and improve public safety strategies in natural hazards. As global climate change impacts on the Australian environment, natural hazards seem to be increasing in scale and frequency, and Emergency Services' public education campaigns have necessarily escalated to keep pace with perceived public threat...
April 26, 2017: BMC Psychology
https://www.readbyqxmd.com/read/28432864/plutonium-in-the-atmosphere-a-global-perspective
#15
REVIEW
P Thakur, H Khaing, S Salminen-Paatero
A number of potential source terms have contributed plutonium isotopes to the atmosphere. The atmospheric nuclear weapon tests conducted between 1945 and 1980 and the re-entry of the burned SNAP-9A satellite in 1964, respectively. It is generally believed that current levels of plutonium in the stratosphere are negligible and compared with the levels generally found at surface-level air. In this study, the time trend analysis and long-term behavior of plutonium isotopes ((239+240)Pu and (238)Pu) in the atmosphere were assessed using historical data collected by various national and international monitoring networks since 1960s...
April 19, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28416662/adapt-to-more-wildfire-in-western-north-american-forests-as-climate-changes
#16
Tania Schoennagel, Jennifer K Balch, Hannah Brenkert-Smith, Philip E Dennison, Brian J Harvey, Meg A Krawchuk, Nathan Mietkiewicz, Penelope Morgan, Max A Moritz, Ray Rasker, Monica G Turner, Cathy Whitlock
Wildfires across western North America have increased in number and size over the past three decades, and this trend will continue in response to further warming. As a consequence, the wildland-urban interface is projected to experience substantially higher risk of climate-driven fires in the coming decades. Although many plants, animals, and ecosystem services benefit from fire, it is unknown how ecosystems will respond to increased burning and warming. Policy and management have focused primarily on specified resilience approaches aimed at resistance to wildfire and restoration of areas burned by wildfire through fire suppression and fuels management...
May 2, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28411563/spatio-temporal-trends-in-fire-weather-in-the-french-alps
#17
S Dupire, T Curt, S Bigot
The Alpine area is particularly sensitive to climatic and environmental changes that might impact socio-ecosystems and modify the regime of natural hazards. Among them, wildfire is of major importance as it threatens both ecosystems and human lives and infrastructures. Wildfires result from complex interactions between available vegetation fuels, climate and weather, and humans who decide of the land use and are the main source of fire ignitions. The changes in fire weather during the past decades are rather unknown in the French Alps especially due to their complex topography...
October 1, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28407537/co2-emissions-from-the-2010-russian-wildfires-using-gosat-data
#18
Meng Guo, Jing Li, Jiawei Xu, Xiufeng Wang, Hongshi He, Li Wu
In the summer of 2010, more than 6 hundred wildfires broke out in western Russia because of an unprecedented intense heat wave that resulted from strong atmospheric blocking. The present study evaluated the CO2 emissions using GOSAT (Greenhouse gases Observing SATellite) data from July 23 to August 18, 2010 for western Russia. The results demonstrated that the GOSAT CAI (Cloud and Aerosol Imager) was well-suited for the identification of smoke plumes and that the GOSAT FTS (Fourier-Transform Spectrometer) TIR (Thermal InfraRed) could be used to calculate the height of the plumes at approximately 800 hPa (1...
April 10, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28401610/the-potential-for-mycobiont-sharing-between-shrubs-and-seedlings-to-facilitate-tree-establishment-after-wildfire-at-alaska-arctic-treeline
#19
Rebecca E Hewitt, F Stuart Chapin, Teresa N Hollingsworth, D Lee Taylor
Root-associated fungi, particularly ectomycorrhizal fungi (EMF), are critical symbionts of all boreal tree species. Although climatically-driven increases in wildfire frequency and extent have been hypothesized to increase vegetation transitions from tundra to boreal forest, fire reduces mycorrhizal inoculum. Therefore, changes in mycobiont inoculum may potentially limit tree-seedling establishment beyond current treeline. We investigated whether ectomycorrhizal shrubs that resprout after fire support similar fungal taxa to those that associate with tree seedlings that establish naturally after fire...
April 12, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28396440/floodplains-as-an-achilles-heel-of-amazonian-forest-resilience
#20
Bernardo M Flores, Milena Holmgren, Chi Xu, Egbert H van Nes, Catarina C Jakovac, Rita C G Mesquita, Marten Scheffer
The massive forests of central Amazonia are often considered relatively resilient against climatic variation, but this view is challenged by the wildfires invoked by recent droughts. The impact of such fires that spread from pervasive sources of ignition may reveal where forests are less likely to persist in a drier future. Here we combine field observations with remotely sensed information for the whole Amazon to show that the annually inundated lowland forests that run through the heart of the system may be trapped relatively easily into a fire-dominated savanna state...
April 25, 2017: Proceedings of the National Academy of Sciences of the United States of America
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