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Displaying 51 - 75 of 185

Evaluation of WRF-Chem Simulated Carbon Dioxide Atmospheric Transport and Emissions in the Baltimore / Washington Metropolitan Area

November 10, 2018
Author(s)
Cory R. Martin, Ning Zeng, Anna Karion, Kimberly L. Mueller, Subhomoy Ghosh, Israel Lopez Coto, Kevin Gurney, Tomohiro Oda, Kuldeep R. Prasad, Yun Liu, Russell R. Dickerson, James R. Whetstone
Urban areas are major sources of carbon dioxide (CO2) emissions, contributing to the increase in global concentrations and leading to concerns about Earth's future climate. In recent years, several urban testbeds have been implemented to improve and

Improving Measurement for Smokestack Emissions - Workshop Summary

September 21, 2018
Author(s)
Rodney A. Bryant, Aaron N. Johnson, John D. Wright, Tamae M. Wong, James R. Whetstone, Michael R. Moldover, Iosif I. Shinder, Scott Swiggard, Chris Gunning, David Elam, Tom Martz, Eric Harman, David Nuckols, Liang Zhang, Woong Kang, Salvator Vigil
The complex flow conditions inherent in power plant smokestacks make accurate flow measurements challenging, which in turn limits the accuracy of hazardous emissions measurements. While stack composition measurements are assessed daily via comparison to a

Improved characterization of methane emissions from the U.S. oil and gas supply chain

June 21, 2018
Author(s)
Ramon A. Alvarez, Daniel Zavala-Araiza, David R. Lyon, David T. Allen, Zachary R. Barkley, Adam R. Brandt, Kenneth J. Davis, Scott C. Herndon, Daniel J. Jacob, Anna Karion, Eric A. Kort, Brian K. Lamb, Thomas Lauvaux, Joannes D. Maasakkers, Anthony J. Marchese, Mark Omara, Stephen W. Pacala, Jeff Peischl, Allen L. Robinson, Paul B. Shepson, Colm Sweeney, Amy Townsend-Small, Steven C. Wofsy, Daniel Zimmerle, Steven P. Hamburg
The contribution of the U.S. oil and natural gas supply chain to global methane emissions - an important factor in climate warming - was estimated using ground-based measurements and validated with region-wide aircraft measurements in areas accounting for

Metrology for stable isotope reference materials: 13C/12C and 18O/16O isotope ratio value assignment of pure carbon dioxide gas samples on the Vienna PeeDee Belmnite-CO2 scale using dual-inlet mass spectrometry

May 25, 2018
Author(s)
Abneesh Srivastava, R M. Verkouteren
Isotope ratio measurements have been conducted on a series of isotopically distinct pure CO2 gas samples using the technique of dual-inlet isotope ratio mass spectrometry (DI-IRMS). The influence of instrumental parameters, data normalization schemes on

Characterization of Five-Hole Probes used for Flow Measurement in Stack Emission Testing

May 16, 2018
Author(s)
Iosif Isaakovich Shinder, Aaron Johnson, Michael R. Moldover, James Filla, Vladimir Khromchenko
We report progress towards the goal of reducing the errors in industrial smokestack flow measurements to 1 % by replacing S-probes with calibrated 3-D probes (i.e., probes that measure 3 components of velocity). NIST calibrated a commercially-manufactured

Progress Towards Accurate Monitoring of Flue Gas Emissions

May 16, 2018
Author(s)
Aaron Johnson, Iosif Isaakovich Shinder, Michael R. Moldover, Joey Boyd, James Filla
The amounts of CO2 and other pollutants emitted by a coal-fired power plant are measured using a continuous emissions monitoring system (CEMS) permanently installed in the exhaust smokestack. The pollutant flux is the product of the pollutant's

Reducing the impact of transport model error in urban greenhouse gas inversion models using the Aliso Canyon natural gas leak as a natural tracer experiment

March 22, 2018
Author(s)
Sharon M. Gourdji, Vineet Yadav, Anna Karion, Kimberly L. Mueller, T. Conley, Stephen Conley, Tom Ryerson, Thomas Nehrkorn, Eric Kort
Urban greenhouse gas (GHG) flux estimation with atmospheric measurements and modeling, i.e., the “top-down” approach, can potentially support emission reduction policies by providing continuous data streams for trend and anomaly detection in conjunction

Deriving global mean OH and atmospheric lifetimes for ozone-depleting substances and greenhouse gases using observed CH3CCl3 and chemistry-climate models

November 3, 2017
Author(s)
Vladimir L. Orkin, Qing Liang, Martyn P. Chipperfield, Matthew Rigby, Olaf Morgenstern, Guus J. Velders, Luke Abraham, Sandip Dhomse, Eric L. Fleming, Steven C. Hardiman, Daniela Iachetti, Charles H. Jackman, Douglas E. Kinnison, Giovanni Pitari, Eugene Rozanov, Andrea Stenke, Fiona Tummon, James B. Burkholder
Tests using flux-based methyl chloroform (MCF) concentrations from four state-of-the-art chemistry-climate models (CCMs) in the two-dimensional 12-box Bayesian inversion model (IM) indicate that the 12-box IM provides a reasonable estimate of global mean

Toward 3D printed hydrogen storage materials made with ABS-MOF composites

September 26, 2017
Author(s)
Megan C. Kreider, Zeeshan Ahmed, Makfir Sefa, James A. Fedchak, Julia Scherschligt, Michael Bible, Nikolai Klimov, Bharath Natarajan, Hartings Mathew
The push to advance efficient, renewable, and clean energy sources has brought with it an effort to generate materials that are capable of storing hydrogen. Metal-organic framework materials (MOFs) have been the focus of many such studies as they are

In Situ Carbon Dioxide and Methane Measurements from the Los Angeles Megacity Carbon Project

July 7, 2017
Author(s)
Kristal R. Verhulst, Anna Karion, Jooil Kim, Peter Salameh, Chris Sloop, Ralph Keeling, Ray Weiss, Riley Duren, John B. Miller
Concern about rising greenhouse gas levels has motivated many nations to begin mitigating emissions, motivating the need for robust, consistent, traceable greenhouse gas observation methods in complex urban domains. The Los Angeles (LA) Megacity Carbon

Photochemical Properties of CH2=CH-CFCl-CF2Br (4-bromo-3-chloro-3,4,4-trifluoro-1-butene) and CH3-O-CH-(CF3)2 (methyl 2,2,2-trifluoroethyl-1-trifluoromethyl ether): OH Reaction Rate Constant, UV and IR Absorption Spectra.

July 7, 2017
Author(s)
Vladimir L. Orkin, Larissa E. Martynova, Michael J. Kurylo III
Abstract Rate constants for the reactions of hydroxyl radicals (OH) with methyl 2,2,2-trifluoroethyl-1-trifluoromethyl ether (CH3-O-CH-(CF3)2 and 4-bromo-3-chloro-3,4,4-trifluoro-1-butene (CH2=CH-CFCl-CF2Br) have been measured over the temperature range
Displaying 51 - 75 of 185