Atmospheric Lifetime and Global Warming Potential of a Perfluoropolyether

2006 ◽  
Vol 40 (7) ◽  
pp. 2242-2246 ◽  
Author(s):  
Cora J. Young ◽  
Michael D. Hurley ◽  
Timothy J. Wallington ◽  
Scott A. Mabury
Keyword(s):  
Global Warming ◽  
Global Warming Potential ◽  
Atmospheric Lifetime

Atmospheric lifetime and global warming potential of HFC-245fa

1999 ◽  
Vol 104 (D7) ◽  
pp. 8173-8181 ◽  
Author(s):  
Malcolm Ko ◽  
Run-Lie Shia ◽  
Nien-Dak Sze ◽  
Hillel Magid ◽  
Robert G. Bray
Keyword(s):  
Global Warming ◽  
Global Warming Potential ◽  
Atmospheric Lifetime

A theoretical insight into atmospheric chemistry of HFE-7100 and perfluoro-butyl formate: reactions with OH radicals and Cl atoms and the fate of alkoxy radicals

2016 ◽  
Vol 40 (7) ◽  
pp. 6148-6155 ◽  
Author(s):  
Bhupesh Kumar Mishra ◽  
Makroni Lily ◽  
Ramesh Chandra Deka ◽  
Asit K. Chandra
Keyword(s):  
Global Warming ◽  
Atmospheric Chemistry ◽  
Global Warming Potential ◽  
Rate Constants ◽  
Oh Radicals ◽  
Atmospheric Lifetime ◽  
Alkoxy Radicals ◽  
Cl Atoms ◽  
Theoretical Insight ◽  
Insight Into

The calculated rate constants for C4F9OCH3 + OH/Cl reactions are found to be 1.94 × 10−14 and 1.74 × 10−12 cm3 molecule−1 s−1, respectively, at 298 K. The atmospheric lifetime and global warming potential for HFE-7100 are computed to be 2.12 years and 155.3, respectively.

Atmosphere-based US emission estimates of SF6 for 2007 - 2018

2021 ◽  
Author(s):  
Lei Hu ◽  
Stephen Montzka ◽  
Ed Dlugokencky ◽  
Phil DeCola ◽  
Debrah Ottinger ◽  
...  
Keyword(s):  
Global Warming ◽  
Greenhouse Gas ◽  
Global Warming Potential ◽  
Sulfur Hexafluoride ◽  
Atmospheric Transport ◽  
Mitigation Strategies ◽  
Reference Network ◽  
Atmospheric Lifetime ◽  
The Us ◽  
Us Epa

<p>Sulfur hexafluoride (SF<sub>6</sub>) is a potent greenhouse gas (GHG) that is primarily emitted from electrical circuit breakers and heavy-duty gas-insulated switchgears in electric transmission and distribution equipment, magnesium production and processing, and electronics production. It has a 100-year global warming potential of 23500 and an atmospheric lifetime of 850 (580 - 1400) years. Because of its extremely large global warming potential and long atmospheric lifetime, its emissions, while currently small, have an outsized influence on changing climate over the long term.  However, current US emissions of SF<sub>6</sub> are uncertain. The US SF<sub>6</sub> consumption that was used to estimate SF<sub>6</sub> emissions in the US EPA national GHG reporting to the UNFCCC has an uncertainty of 30 – 60%, depending on whether to use the US SF<sub>6</sub> supplier reports or user reports. With different inventory methodologies, the national emissions estimates of SF<sub>6</sub> from the EDGAR and US EPA’s GHG inventories differ by more than a factor of 4. Here, we will present the first detailed U.S. national and regional emissions of SF<sub>6</sub> that were derived from an inverse analysis of an extensive flask-air sampling network from the US NOAA’s Global Greenhouse Gas Reference Network and high-resolution atmospheric transport simulations for 2007 - 2018. We will discuss our atmosphere-based top-down emission estimates in comparison with the existing bottom-up emission inventories, our derived seasonal variation of SF<sub>6</sub> emissions, and associated implications regarding each industry’s contribution to emissions and optimal emissions mitigation strategies. Because atmospheric SF<sub>6</sub> measurements are also used to assess atmospheric transport errors assuming no biases in SF<sub>6</sub> emissions reported by the EDGAR inventory, our analysis also has important implications on limitations in such applications.</p>

scholarly journals Atmospheric chemistry of CF3 CFHOCF3 : Reaction with OH radicals, atmospheric lifetime, and global warming potential

2002 ◽  
Vol 107 (D21) ◽  
pp. ACH 4-1-ACH 4-6 ◽  
Author(s):  
Kenshi Takahashi ◽  
Yutaka Matsumi ◽  
Timothy J. Wallington ◽  
Michael D. Hurley
Keyword(s):  
Global Warming ◽  
Atmospheric Chemistry ◽  
Global Warming Potential ◽  
Oh Radicals ◽  
Atmospheric Lifetime

scholarly journals Variation in Soil Properties Regulate Greenhouse Gas Fluxes and Global Warming Potential in Three Land Use Types on Tropical Peat

Atmosphere ◽  
2018 ◽  
Vol 9 (12) ◽  
pp. 465 ◽  
Author(s):  
Kiwamu Ishikura ◽  
Untung Darung ◽  
Takashi Inoue ◽  
Ryusuke Hatano
Keyword(s):  
Global Warming ◽  
Soil Moisture ◽  
Groundwater Level ◽  
Global Warming Potential ◽  
C:N Ratio ◽  
Co2 Flux ◽  
Nitrate Content ◽  
N2o Flux ◽  
Ch4 Flux ◽  
In The Beginning

This study investigated spatial factors controlling CO2, CH4, and N2O fluxes and compared global warming potential (GWP) among undrained forest (UDF), drained forest (DF), and drained burned land (DBL) on tropical peatland in Central Kalimantan, Indonesia. Sampling was performed once within two weeks in the beginning of dry season. CO2 flux was significantly promoted by lowering soil moisture and pH. The result suggests that oxidative peat decomposition was enhanced in drier position, and the decomposition acidify the peat soils. CH4 flux was significantly promoted by a rise in groundwater level, suggesting that methanogenesis was enhanced under anaerobic condition. N2O flux was promoted by increasing soil nitrate content in DF, suggesting that denitrification was promoted by substrate availability. On the other hand, N2O flux was promoted by lower soil C:N ratio and higher soil pH in DBL and UDF. CO2 flux was the highest in DF (241 mg C m−2 h−1) and was the lowest in DBL (94 mg C m−2 h−1), whereas CH4 flux was the highest in DBL (0.91 mg C m−2 h−1) and was the lowest in DF (0.01 mg C m−2 h−1), respectively. N2O flux was not significantly different among land uses. CO2 flux relatively contributed to 91–100% of GWP. In conclusion, it is necessary to decrease CO2 flux to mitigate GWP through a rise in groundwater level and soil moisture in the region.

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