Sentences with phrase «ch4 emission factors»

The authors re-evaluated the data used to calculate IPCC 2006 CH4 emission factors resulting from enteric fermentation in dairy cows and other cattle, and manure management from dairy cows, other cattle and swine.

Not exact matches

In this study, we created new per - animal emissions factors — that is measures of the average amount of CH4 discharged by animals into the atmosphere — and new estimates of global livestock methane emissions.»

This paper presents a review of existing literature on emission factors, emission data collection techniques, and analytic approaches; presents the results of SAIC's analysis of available CO2 and CH4 GHG emission data from chassis dynamometer tests of heavy - duty vehicle exhaust; and provides suggestions for further reducing this uncertainty.

There are a number of factors that control CH4 concentrations that are extermely poorly understood and are mostly ignored in the scenarios — the dependence on other gases (such as O3, and CO), the impact of increased temperatures and changes to precip on tropical and boreal wetland emissions, the existence (or not) of a significant methane hydrate source from permafrost or continental shelves, the climate impact on the atmopsheric chemistry of CH4.

After accounting for errors associated with transport, planetary boundary layer height, lateral boundary conditions, seasonality of emissions, and the spatial resolution of surface emission prior estimates, we find that the California Air Resources Board (CARB) CH4 budget is a factor of 1.64 too low.

In wetland ecosystems, NPP has been posited as a «master variable» that integrates several important environmental factors influencing CH4 emission (Whiting and Chanton 1993).

A recent analysis of CH4 fluxes from hydroelectric reservoirs showed that 10 % of reservoirs have emission factors (gCO2e per kilowatt hour) larger than the CO2 emissions from natural gas combined cycle plants (Hertwich 2013), although the authors did not consider carbon burial offsets.

Of the factors examined, CH4 emissions were best predicted by chlorophyll a concentrations (positive correlation, p < 0.001, R2 = 0.50, n = 31); CO2 emissions were best predicted by reported mean annual precipitation (positive correlation, p = 0.04, R2 = 0.11, n = 33); and N2O emissions were most strongly related to reservoir NO3 — concentrations (positive correlation, p < 0.001, R2 = 0.49, n = 18, table 3, supplemental figure S6).

These O3 increases are attributable to the concurrent, large (almost factor of 3) increases in anthropogenic NOx and CH4 emissions.

would increase Arctic CH4 emissions by about a factor of 25, and would make the present - day permafrost area about two times more productive of CH4 on average as comes from wetlands today.

As concluded above, an increase in Arctic CH4 emissions of more than a factor of 10 is required before it would begin to have a significant impact on Earth's climate in the short term.

[Response: I'm sure you're right, a factor of 10 increase in CH4 emission from the Arctic would be serious and bad.

As David said, «a factor of ten increase in CH4 emission from the Arctic would be serious...» Is that an unreasonable possibility?