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Environment

Greenhouse Gas Measurements

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  • Published Date
Displaying 26 - 50 of 199

The impact of the COVID-19 lockdown on greenhouse gases: a multi-city analysis of in situ atmospheric observations

April 27, 2022
Author(s)
Vanessa Monteiro, Natasha Miles, Scott Richardson, Jocelyn Turnbull, Anna Karion, Jooil Kim, Kristal Verhulst, Logan Mitchell, John Lin, Maryann Sargent, Steven Wofsy, Felix Vogel, Kenneth Davis
We tested the capabilities of urban greenhouse gas (GHG) measurement networks to detect abrupt changes in emissions, such as those caused by the roughly 6-week COVID-19 lockdown in March 2020 using hourly in situ GHG mole fraction measurements from six

Life Cycle Environmental Impacts of Plastics: A Review

March 1, 2022
Author(s)
Paul Rikhter, Ilayda Dinc, Yirui Zhang, Ted Jiang, Bobby Miyashiro, Shelby Walsh, Ruoyu Wang, Yvonne Dinh, Sangwon Suh, Joshua D. Kneifel
Global production and consumption of plastics and its deposition in the environment are growing rapidly, while their life-cycle impacts to the environment are yet to be fully understood. This study reviews the existing literature with the goal of

Background conditions for an urban greenhouse gas network in the Washington, D.C. and Baltimore metropolitan region

August 25, 2021
Author(s)
Anna Karion, Israel Lopez Coto, Sharon Gourdji, Kimberly Mueller, Subhomoy Ghosh, William Callahan, Michael Stock, Elizabeth DiGangi, Steve Prinzivalli, James Whetstone
As city governments take steps towards establishing emissions reduction targets, the atmospheric research community is increasingly able to assist in tracking emissions reductions. Researchers have established systems for observing atmospheric greenhouse

The impact of COVID-19 on CO2 emissions in the Los Angeles and Washington DC/Baltimore metropolitan areas

June 7, 2021
Author(s)
Kimberly Mueller, Anna Karion, Sharon Gourdji, Israel Lopez Coto, James Whetstone, Vineet Yadav, Geoffrey Roest, Kevin R. Gurney, Kristal R. Verhulst, Jooil Kim, Michael Stock, Elizabeth DiGangi, Steve Prinzivalli, Ralph Keeling, R. F. Weiss, Charles E. Miller, Clayton Fain, Riley Duren, Subhomoy Ghosh
Responses to COVID-19 has resulted in and unintended reductions of city-scale carbon dioxide (CO2) emissions. Here we detect and estimate decreases in CO2 emissions in Los Angeles and Washington DC/Baltimore during March and April 2020. Our analysis uses

Blow-Down Calibration of a Large Ultrasonic Flow Meter

April 21, 2021
Author(s)
Aaron Johnson, Eric Harman, Joey Boyd
Oil and gas production industries use large (diameter > 0.8 m) ultrasonic flow meters (USMs) to measure exhaust gas from flare stacks, emissions from smokestacks, flow of natural gas, etc. Since most flow laboratories do not have compressors with

Under-reporting of greenhouse gas emissions in U.S. cities

February 2, 2021
Author(s)
Kimberly Mueller, Kevin R. Gurney, Thomas Lauvaux, Geoffrey Roest, Jianming Liang, Yang Song
Cities dominate greenhouse gas (GHG) emissions and are emerging as climate mitigation leaders. Many have generated self-reported GHG emission inventories (SRIs) but their accuracy and value to emissions mitigation policymaking is untested. The Vulcan

Fluxes of Atmospheric Greenhouse-Gases in Maryland (FLAGG-MD): Emissions of Carbon Dioxide in the Baltimore-Washington, DC area

April 15, 2020
Author(s)
Doyeon Ahn, Jonathan R. Hansford, Shawn T. Howe, Xinrong R. Ren, Ross J. Salawitch, Ning Zeng, Mark D. Cohen, Barbara Stunder, Olivia E. Salmon, Paul B. Shepson, Kevin R. Gurney, Tomohiro Oda, Israel Lopez Coto, James Whetstone, Russel R. Dickerson
To study emissions of CO2 in the Baltimore-Washington, DC (Balt-Wash) area, an aircraft campaign was conducted in February 2015, as part of the FLAGG-MD (Fluxes of Atmospheric Greenhouse-Gases in Maryland) project. During the campaign, elevated mixing

Greenhouse gas observations from the Northeast Corridor tower network

March 25, 2020
Author(s)
Anna Karion, William Callahan, Michael Stock, Steve Prinzivalli, Kristal R. Verhulst, Jooil Kim, Peter Salameh, Israel Lopez Coto, James R. Whetstone
We present the organization, structure, instrumentation, and measurements of the Northeast Corridor greenhouse gas observation network. This network of tower-based in-situ carbon dioxide and methane observations was established in 2015 with the goal of

Faster, More Accurate, Stack-Flow Measurements

February 25, 2020
Author(s)
Aaron N. Johnson, Iosif I. Shinder, Bernard J. Filla, Joey T. Boyd, Rodney A. Bryant, Michael R. Moldover, Thomaa D. Martz, Matthew Gentry
Exhaust flows from coal-fired electricity-generating-plants are determined by measuring the flue gas velocity at prescribed points in the stack cross section. These velocity measurements are made using EPA-approved differential pressure probes such as the

Wintertime CO2, CH4 and CO emissions estimation for the Washington DC / Baltimore metropolitan area using an inverse modeling technique

February 11, 2020
Author(s)
Israel Lopez Coto, Xinrong Ren, Olivia E. Salmon, Anna Karion, Paul B. Shepson, Russell R. Dickerson, Ariel Stein, Kuldeep R. Prasad, James R. Whetstone
Since greenhouse gas mitigation efforts are being mostly implemented in cities, the ability to quantify emission trends for urban environments is of paramount importance. However, previous aircraft work has indicated large daily variability in the results
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