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PACIFIC NORTHWEST LABORATORY DIVISION OF ISOTOPE DEVELOPMENT PROGRAMS QUARTERLY REPORT: FEBRUARY - APRIL 1970

Description: This report provides detailed and timely information on the results of the isotopic fuels program and related research being conducted at the Pacific Northwest Laboratory by Battelle-Northwest for the U.S. Atomic Energy Commission. This report covers the 3-month period, February through April 1970.
Date: May 1, 1970
Creator: Hansen, J. E.
Partner: UNT Libraries Government Documents Department
open access

Technology status report: In situ vitrification applied to buried wastes

Description: This document is a technical status report on In Situ Vitrification (ISV) as applied to buried waste; the report takes both technical and institutional concerns into perspective. The ISV process involves electrically melting such contaminated solid media as soil, sediment, sludge, and mill tailings. The resultant product is a high-quality glass-and-crystalline waste form that possesses high resistance to corrosion and leaching and is capable of long-term environmental exposure without significa… more
Date: September 1, 1992
Creator: Thompson, L. E.; Bates, S. O. & Hansen, J. E.
Partner: UNT Libraries Government Documents Department
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Black carbon emissions in the United Kingdom during the past four decades: An empirical analysis

Description: We use data from a unique 40-year record of 150 urban and rural stations in the ''Black Smoke and SO2 Network'' in Great Britain to infer information about sources of atmospheric black carbon (BC). The data show a rapid decline of ambient atmospheric BC between 1962 and the early 1990s that exceeds the decline in official estimates of BC emissions based only on amount of fuel use and mostly fixed emission factors. This provides empirical confirmation of the existence and large impact of a time-… more
Date: April 22, 2004
Creator: Novakov, T. & Hansen, J.E.
Partner: UNT Libraries Government Documents Department
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Aerosol organic carbon to black carbon ratios: Analysis ofpublished data and implications for climate forcing

Description: Measurements of organic carbon (OC) and black carbon (BC)concentrations over a variety of locations worldwide, have been analyzed to infer the spatial distributions of the ratios of OC to BC. Since these ratios determine the relative amounts of scattering and absorption, they are often used to estimate the radiative forcing due to aerosols. An artifact in the protocol for filter measurements of OC has led to widespread overestimates of the ratio of OC to BC in atmospheric aerosols. We developed… more
Date: July 11, 2005
Creator: Novakov, T.; Menon, S.; Kirchstetter, T.W.; Koch, D. & Hansen, J.E.
Partner: UNT Libraries Government Documents Department
open access

Large historical changes of fossil-fuel black carbon aerosols

Description: Anthropogenic emissions of fine black carbon (BC) particles, the principal light-absorbing atmospheric aerosol, have varied during the past century in response to changes of fossil-fuel utilization, technology developments, and emission controls. We estimate historical trends of fossil-fuel BC emissions in six regions that represent about two-thirds of present day emissions and extrapolate these to global emissions from 1875 onward. Qualitative features in these trends show rapid increase in th… more
Date: September 26, 2002
Creator: Novakov, T.; Ramanathan, V.; Hansen, J.E.; Kirchstetter, T.W.; Sato, M.; Sinton, J.E. et al.
Partner: UNT Libraries Government Documents Department
open access

Technology status report: In situ vitrification applied to buried wastes

Description: This document is a technical status report on In Situ Vitrification (ISV) as applied to buried waste; the report takes both technical and institutional concerns into perspective. The ISV process involves electrically melting such contaminated solid media as soil, sediment, sludge, and mill tailings. The resultant product is a high-quality glass-and-crystalline waste form that possesses high resistance to corrosion and leaching and is capable of long-term environmental exposure without significa… more
Date: September 1, 1992
Creator: Thompson, L.E. (Pacific Northwest Lab., Richland, WA (United States)); Bates, S.O. (EG and G Idaho, Inc., Idaho Falls, ID (United States)) & Hansen, J.E. (Geosafe Corp., Richland, WA (United States))
Partner: UNT Libraries Government Documents Department
open access

Causes of Ocean Surface temperature Changes in Atlantic andPacific Topical Cyclogenesis Regions

Description: Previous research has identified links between changes in sea surface temperature (SST) and hurricane intensity. We use climate models to study the possible causes of SST changes in Atlantic and Pacific tropical cyclogenesis regions. The observed SST increases in these regions range from 0.32 to 0.67 C over the 20th century. The 22 climate models examined here suggest that century-timescale SST changes of this magnitude cannot be explained solely by unforced variability of the climate system, e… more
Date: January 31, 2006
Creator: Santer, B. D.; Wigley, T. M. L.; Gleckler, P. J.; Bonfils, C.; Wehner, M. F.; AchutaRao, K. et al.
Partner: UNT Libraries Government Documents Department
open access

Amplification of surface temperature trends and variability in thetropical atmosphere

Description: The month-to-month variability of tropical temperatures is larger in the troposphere than at the Earth's surface. This amplification behavior is similar in a range of observations and climate model simulations, and is consistent with basic theory. On multi-decadal timescales, tropospheric amplification of surface warming is a robust feature of model simulations, but occurs in only one observational dataset. Other observations show weak or even negative amplification. These results suggest that … more
Date: August 11, 2005
Creator: Santer, B. D.; Wigley, T. M. L.; Mears, C.; Wentz, F. J.; Klein, S. A.; Seidel, D. J. et al.
Partner: UNT Libraries Government Documents Department
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