Social and Behavioral Sciences Commons^™

Joint Co2 Mole Fraction And Flux Analysis Confirms Missing Processes In Casa Terrestrial Carbon Uptake Over North America, Sha Feng, Thomas Lauvaux, Christopher A. Williams, Kenneth J. Davis, Yu Zhou, Ian Baker, Zachary R. Barkley, Daniel Wesloh

Geography

Terrestrial biosphere models (TBMs) play a key role in the detection and attribution of carbon cycle processes at local to global scales and in projections of the coupled carbon-climate system. TBM evaluation commonly involves direct comparison to eddy-covariance flux measurements. We use atmospheric CO2 mole fraction ([CO2]) measured in situ from aircraft and tower, in addition to flux-measurements from summer 2016 to evaluate the Carnegie-Ames-Stanford-Approach (CASA) TBM. WRF-Chem is used to simulate [CO2] using biogenic CO2 fluxes from a CASA parameter-based ensemble and CarbonTracker version 2017 (CT2017) in addition to transport and CO2 boundary condition ensembles. The resulting “super ensemble” …

Upside-Down Fluxes Down Under: Co2 Net Sink In Winter And Net Source In Summer In A Temperate Evergreen Broadleaf Forest, Alexandre A. Renchon, Anne Griebel, Daniel Metzen, Christopher A. Williams, Belinda Medlyn, Remko A. Duursma, Craig V.M. Barton, Chelsea Maier, Matthias M. Boer, Peter Isaac, David Tissue, Victor Resco De Dios, Elise Pendall

Geography

Predicting the seasonal dynamics of ecosystem carbon fluxes is challenging in broadleaved evergreen forests because of their moderate climates and subtle changes in canopy phenology. We assessed the climatic and biotic drivers of the seasonality of net ecosystem-atmosphere CO2 exchange (NEE) of a eucalyptus-dominated forest near Sydney, Australia, using the eddy covariance method. The climate is characterised by a mean annual precipitation of 800mm and a mean annual temperature of 18°C, hot summers and mild winters, with highly variable precipitation. In the 4-year study, the ecosystem was a sink each year (-225gCm-2yr-1 on average, with a standard deviation of 108gCm-2yr-1); …

Information Technology Approaches To Forest Management, Mary Snow, Richard Snow

Publications

The majority of the world’s forests occur where there is a dry season long enough to affect a seasonal change in the forest community. The seasonal forest may include evergreen, semi-deciduous, deciduous trees, or some combination of these. Local differences in soil or other site characteristics often determine which community persists. Since the seasonal forests exist where there is seasonal precipitation, the character of the forest is closely associated with the length of the rainy season. As the length of the rainy season decreases, the density of the canopy decreases. If the global climate system warms and prolonged drought gives …

Recent Pause In The Growth Rate Of Atmospheric Co2 Due To Enhanced Terrestrial Carbon Uptake, Trevor F. Keenan, I. Colin Prentice, Josep G. Canadell, Christopher A. Williams, Han Wang, Michael Raupach, G. James Collatz

Geography

Terrestrial ecosystems play a significant role in the global carbon cycle and offset a large fraction of anthropogenic CO2 emissions. The terrestrial carbon sink is increasing, yet the mechanisms responsible for its enhancement, and implications for the growth rate of atmospheric CO2, remain unclear. Here using global carbon budget estimates, ground, atmospheric and satellite observations, and multiple global vegetation models, we report a recent pause in the growth rate of atmospheric CO2, and a decline in the fraction of anthropogenic emissions that remain in the atmosphere, despite increasing anthropogenic emissions. We attribute the observed decline to increases in the terrestrial …

A Full Greenhouse Gases Budget Of Africa: Synthesis, Uncertainties, And Vulnerabilities, R. Valentini, A. Arneth, A. Bombelli, S. Castaldi, R. Cazzolla Gatti, F. Chevallier, P. Ciais, E. Grieco, J. Hartmann, M. Henry, R. A. Houghton, M. Jung, W. L. Kutsch, Y. Malhi, E. Mayorga, L. Merbold, G. Murray-Tortarolo, D. Papale, P. Peylin, B. Poulter, P. A. Raymond, M. Santini, S. Sitch, G. Vaglio Laurin, G. R. Van Der Werf, Christopher A. Williams, R. J. Scholes

Geography

This paper, developed under the framework of the RECCAP initiative, aims at providing improved estimates of the carbon and GHG (CO2, CH4 and N2O) balance of continental Africa. The various components and processes of the African carbon and GHG budget are considered, existing data reviewed, and new data from different methodologies (inventories, ecosystem flux measurements, models, and atmospheric inversions) presented. Uncertainties are quantified and current gaps and weaknesses in knowledge and monitoring systems described in order to guide future requirements. The majority of results agree that Africa is a small sink of carbon on an annual scale, with an average …

Does Terrestrial Drought Explain Global Co 2 Flux Anomalies Induced By El Niño?, C. R. Schwalm, Christopher A. Williams, K. Schaefer, I. Baker, G. J. Collatz, C. Rödenbeck

Geography

The El Niño Southern Oscillation is the dominant year-to-year mode of global climate variability. El Niño effects on terrestrial carbon cycling are mediated by associated climate anomalies, primarily drought, influencing fire emissions and biotic net ecosystem exchange (NEE). Here we evaluate whether El Niño produces a consistent response from the global carbon cycle. We apply a novel bottom-up approach to estimating global NEE anomalies based on FLUXNET data using land cover maps and weather reanalysis. We analyze 13 years (1997-2009) of globally gridded observational NEE anomalies derived from eddy covariance flux data, remotely-sensed fire emissions at the monthly time step, …

Slides: Shale And Air Quality: The View From The Other Side, Jeremy Nichols

Shale Plays in the Intermountain West: Legal and Policy Issues (November 12)

Presenter: Jeremy Nichols, Climate & Energy Program Director, WildEarth Guardians, Denver, CO

18 slides

Slides: Environmentally Friendly Drilling Systems Program (Efd), Rich Haut

Best Practices for Community and Environmental Protection (October 14)

Presenter: Rich Haut, Houston Advanced Research Center

23 slides

Source Regions For Co2 At Cape Point Assessed By Modelling, 222rn And Meteorological Data, S. Whittlestone, E. Kowalczyk, E.-G Brunke, C. Labuschagne

Faculty of Science - Papers (Archive)

This study explores methods of characterising experimental and modelling data to see if trace gas measurements at the Cape Point GAW station could improve our understanding of sources from the continent. Selection criteria have been defined which make it possible to divide the samples into categories with predominant transport to Cape Point from one of four source regions: City (greater Cape Town); close rural (within about 150 km of Cape Point); distant rural (from 150 to about 500 km) and very distant rural covering the rest of southern Africa. For species with fairly uniform source such as radon or CO, …

Water Treatment: Keeping It Pure, Petros Katsioloudis

STEMPS Faculty Publications

The article discusses the importance of water treatment in providing quality and safe drinking water. A historical background of the U.S. federal regulation of drinking water quality is presented. It was found by the Public Health Service in 1969 that only 60 percent of the systems surveyed delivered water that met all the Public Health Service standards. Filtration and chlorination are also cited as an effective treatment techniques for protecting U.S. water supplies from harmful microbes. An overview of the process of water treatment is presented.

International Technology Transfer For Climate Policy, David Popp

Center for Policy Research

While the developed world is starting to limit emissions of greenhouse gases, emissions from the developing world are increasing as a result of economic growth. Reducing these emissions while still enabling developing countries to grow requires the use of new technologies. In most cases, these technologies are first created in high-income countries. Thus, the challenge for climate policy is to encourage the transfer of these climate-friendly technologies to the developing world. This policy brief reviews the economic literature on environmental technology transfer. It then discusses the implications of this literature for climate policy, focusing on the Clean Development Mechanism (CDM) …

The Growing Influence Of Tort And Property Law On Natural Resources Law: Case Studies Of Coal Bed Methane Development And Geologic Carbon Sequestration, Alexandra B. Klass

The Future of Natural Resources Law and Policy (Summer Conference, June 6-8)

19 pages.

"Alexandra B. Klass, Associate Professor of Law, University of Minnesota Law School"

Action On Global Warming: Making Room For Tribal Governments In The New Kind Of Wedge Issue, Dean B. Suagee

The Climate of Environmental Justice: Taking Stock (March 16-17)

Presenter: Dean B. Suagee, Of Counsel, Hobbs, Straus, Dean & Walker LLP, Washington, D.C.

1 page.

Transcranial Doppler Estimation Of Cerebral Blood Flow And Cerebrovascular Conductance During Modified Rebreathing, Jurgen A.H.R. Claassen, Rong Zhang, Qi Fu, Sarah Witkowski, Benjamin D. Levine

Exercise and Sport Studies: Faculty Publications

Clinical transcranial Doppler assessment of cerebral vasomotor reactivity (CVMR) uses linear regression of cerebral blood flow velocity (CBFV) vs. end-tidal CO2 (PETCO2) under steady-state conditions. However, the cerebral blood flow (CBF)-PETCO2 relationship is nonlinear, even for moderate changes in CO2. Moreover, CBF is increased by increases in arterial blood pressure (ABP) during hypercapnia. We used a modified rebreathing protocol to estimate CVMR during transient breath-by-breath changes in CBFV and PETCO2. Ten healthy subjects (6 men) performed 15 s of hyperventilation followed by 5 min of rebreathing, with supplemental O2 to maintain arterial oxygen saturation constant. To minimize effects of changes …

Global Warming And Transportation System Planning, Bob Yuhnke

Climate Change and the Future of the American West: Exploring the Legal and Policy Dimensions (Summer Conference, June 7-9)

Presenter: Bob Yuhnke, Robert E. Yuhnke & Associates, Boulder, CO.

4 pages.

Carbon Dioxide For Euthanasia: Concerns Regarding Pain And Distress, With Special Reference To Mice And Rats, Kathleen Conlee, Martin Stephens, Andrew N. Rowan, Lesley A. King

Laboratory Experiments Collection

Carbon dioxide (CO₂) is the most commonly used agent for euthanasia of laboratory rodents, used on an estimated tens of millions of laboratory rodents per year worldwide, yet there is a growing body of evidence indicating that exposure to CO₂ causes more than momentary pain and distress in these and other animals. We reviewed the available literature on the use of CO₂ for euthanasia (as well as anaesthesia) and also informally canvassed laboratory animal personnel for their opinions regarding this topic. Our review addresses key issues such as CO₂ flow rate and final concentration, presence …

Air Pollution And Per Capita Income, Rachel A. Bouvier

PERI Working Papers

During the last decade, researchers have investigated the relationship between per capita income and environmental quality. This paper disaggregates the relationship between per capita income and emissions of carbon monoxide, carbon dioxide, sulfur dioxide, and volatile organic compounds into scale, composition and technology effects, using data from European and North American countries from the period 1980-1986. Results indicate that the scale effect outweighs the composition and technology effects in the cases of carbon dioxide and volatile organic compounds, while the opposite is true in the cases of carbon monoxide and sulfur dioxide. The results also suggest that greater democracy is …

Greenhouse, Land Management And Carbon Sequestration In Western Australia, Department Of Agriculture And Food, Wa, Department Of Conservation And Land Management, Forrest Products Commission, Department Of Environment, Water And Catchment Protection, Anne Bennett

Agriculture reports

This report examines options for greenhouse emissions abatement by changing land management practices and establishing terrestrial organic carbon sinks in Western Australia.