Sentences with phrase «for atmospheric methane»

Upland (i.e., well - drained, oxic) soils are a net sink for atmospheric methane; as methane diffuses from the atmosphere into these soils, methane consuming (i.e., methanotrophic) bacteria oxidize it.

The baseline for atmospheric methane used in the study is just under two parts per million — a figure accepted by most experts as well within the range of naturally occurring gas levels.

The IPCC Third Assessment Report projections for atmospheric methane concentrations, CO2 emissions and atmospheric concentrations, and resultant temperature increases (i.e. 1.4 to 5.8 degrees Celsius from 1990 to 2100) constitute the greatest fraud in the history of environmental science:

«Such information may not only be relevant for atmospheric methane budget studies but may also be important for understanding the leaking potential of petroleum systems, whether they are commercial or not.»

Not exact matches

The main objectives of this mission are to search for evidence of methane and other trace atmospheric gases that could be signatures of active biological or geological processes and to test key technologies in preparation for ESA's contribution to subsequent missions to Mars.

In addition to the isotope concentration, the air bubbles trapped in the ice cores allow for measurement of the atmospheric concentrations of trace gases, including greenhouse gases carbon dioxide, methane, and nitrous oxide.

The scientists knew that under atmospheric pressure all compounds of carbon, hydrogen, and oxygen, except for methane, water, and carbon dioxide, are thermodynamically unstable.

During the early 2000s, environmental scientists studying methane emissions noticed something unexpected: the global concentrations of atmospheric methane (CH4)-- which had increased for decades, driven by methane emissions from fossil fuels and agriculture — inexplicably leveled off.

For months of weekly press conferences, reporters had been asking about Curiosity's analyses of atmospheric methane on Mars.

The amount of atmospheric methane has remained relatively stable for about a decade, but concentrations began to rise again in 2007.

For example, research in Los Angeles is showing that small methane leaks in homes between the gas meter and heaters and stoves could be leading to higher atmospheric methane concentrations there, he said, whereas other cities may have old, leaking gas pipes.

Rice serves as the staple food for more than half of the world's population, but it's also the one of the largest humanmade sources of atmospheric methane, a potent greenhouse gas.

THE rise in atmospheric carbon dioxide predicted for this century could blunt the appetite of soil microbes that consume a large chunk of atmospheric methane, adding to the greenhouse effect, claim researchers in North Carolina.

http://adsabs.harvard.edu/abs/1994JGR….9916913L «Concentration and 13C records of atmospheric methane in New Zealand and Antarctica: Evidence for changes in methane sources» Lowe et al 1994

On March 19, 2008, astronomers using the Hubble Space Telescope announced confirmation of the presence of water and the detection of more methane in the atmosphere of the planet than would be predicted by conventional atmospheric models for «hot Jupiters» (Hubble news release and videos; ESA news release and videos; and Swain et al, 2008 — more below).

It's correct that an extra methane molecule is something like 25 times more influential than an extra CO2 molecule, although that ratio is primarily determined by the background atmospheric concentration of either gas, and GWP typically assumes that forcing is linear in emission pulse, which is not valid for very large perturbations.

For decades, atmospheric scientists cast methane in the leading role.

Here we present a chronology for the deep part of the core (67.8 - 31.2 ka BP), which is based on stratigraphic matching to annual - layer - counted Greenland ice cores using globally well - mixed atmospheric methane.

... The Earth's atmospheric methane concentration has increased by about 150 % since 1750, and it accounts for 20 % of the total radiative forcing from all of the long - lived and globally mixed greenhouse gases (these gases don't include water vapor which is by far the largest component of the greenhouse effect).

Bruhwiler, L., et al. (2014), CarbonTracker - CH4: An assimilation system for estimating emissions of atmospheric methane, Atmos.

Response: I recommend you read the paper (or a recent popular summary) for the detailed answers, but essentially Hansen posits that concentrations of key atmospheric forcings (especially methane and black carbon) can be realistically controlled more effectively than the standard scenarios allow.

Evaluating atmospheric methane inversion model results for Pallas, northern Finland.

The study shows that during drilling, as much as 34 grams of methane per second were spewing into the air from seven natural gas well pads in southwest Pennsylvania — up to 1,000 times the EPA estimate for methane emissions during drilling, Purdue atmospheric chemistry professor and study lead author Paul Shepson said in a statement.

TRUTH: Only a small percentage of atmospheric methane comes from ruminant flatulence; the largest source is the burning of fossil fuels for electricity, heat, and transportation.

We find (i) measurements at all scales show that official inventories consistently underestimate actual CH4 [methane] emissions, with the natural gas and oil sectors as important contributors; (ii) many independent experiments suggest that a small number of «super-emitters» could be responsible for a large fraction of leakage; (iii) recent regional atmospheric studies with very high emissions rates are unlikely to be representative of typical natural gas system leakage rates; and (iv) assessments using 100 - year impact indicators show system - wide leakage is unlikely to be large enough to negate climate benefits of coal - to - natural gas substitution.

The climate models as described here won't produce glacial / interglacial cycles if run for a long time, and that is because they treat the atmospheric content of trace IR - absorbing gases (CO2, methane and N2O) as external forcings.

http://adsabs.harvard.edu/abs/1994JGR….9916913L «Concentration and 13C records of atmospheric methane in New Zealand and Antarctica: Evidence for changes in methane sources» Lowe et al 1994

As an example of the possible extreme change in radiative forcing in a 50 - year time horizon for Isaken et al (2011)'s 4 x CH4 (i.e. quadrupling the current atmospheric methane burden) case of additional emission of 0.80 GtCH4 / yr is 2.2 Wm - 2, and as the radiative forcing for the current methane emissions of 0.54 GtCH4 / yr is 0.48 Wm - 2, this give an updated GWP for methane, assuming the occurrence of Isaksen et al's 4 x CH4 case in 2040, would be: 33 (per Shindell et al 2009, note that AR5 gives a value of 34) times (2.2 / [0.8 + 0.48]-RRB- divided by (0.54 / 0.48) = 50.

For example, Isaken et al (2011) quantify how as atmospheric methane concentrations increase, the global warming potential, GWP, of methane also increases (see references at end of post).

The methane chart for Barrow, Alaska confirms a big jump in atmospheric methane in the most recent data.

The IPCC Third Assessment Report's (TAR's) projections for methane atmospheric concentrations, carbon dioxide emissions and atmospheric concentrations, and resultant temperature increases constitute the greatest fraud in the history of environmental science.

As Steve mentioned in his e-mail, our ability to measure atmospheric methane has been subject to tight budget constraints for many years.

Also, haven't atmospheric methane levels been dropping for around ten years?

For example, according to the IPCC, there is approximately a 50/50 chance that atmospheric methane concentrations will rise to approximately 2500 ppb by 2060, from a value of approximately 1750 ppb in 2000.

If so, I think we want to include tightly coupled chemical and biological processes, in that case — for example, the chemical fate of atmospheric methane over time, the effects of increasing atmospheric CO2 on oceanic acid - base chemistry, and the response of the biological components of the carbon cycle to increased temperatures and a changing hydrologic cycle.

Evaluating atmospheric methane inversion model results for Pallas, northern Finland.

Exceeding the 400 parts per million level of worldwide atmospheric carbon dioxide later this decade continues a troubling trend which brings the world closer to the potential to reach a global warming tipping point in which global warming accelerates rapidly as the potent greenhouse gas methane is liberated from the frozen state that it has been in for millions of years.

On longer timescales, atmospheric composition and climate have been intertwined for billions of years, especially via methane, which is both a powerful greenhouse gas and is chemically reactive.

Bruhwiler, L., et al. (2014), CarbonTracker - CH4: An assimilation system for estimating emissions of atmospheric methane, Atmos.

Isro will launch two satellites — one for atmospheric change and another to study the methane and carbon dioxide content in the atmosphere, crucial for climate change study by 2011, chairman G. Madhavan Nair said.

The amount of atmospheric methane had remained relatively stable for about a decade, but concentrations began to rise again in 2007.

Last year atmospheric methane was the subject of 600 peer - reviewed publications, compared with 2,000 for CO2.

1 Positive 1.1 Carbon cycle feedbacks 1.1.1 Arctic methane release 1.1.1.1 Methane release from melting permafrost peat bogs 1.1.1.2 Methane release from hydrates 1.1.2 Abrupt increases in atmospheric methane 1.1.3 Decomposition 1.1.4 Peat decomposition 1.1.5 Rainforest drying 1.1.6 Forest fires 1.1.7 Desertification 1.1.8 CO2 in the oceans 1.1.9 Modelling results 1.1.9.1 Implications for climate policy 1.2 Cloud feedback 1.3 Gas release 1.4 Ice - albedo feedback 1.5 Water vapor feedback 2 Negative 2.1 Carbon cycle 2.1.1 Le Chatelier's principle 2.1.2 Chemical weathering 2.1.3 Net Primary Productivity 2.2 Lapse rate 2.3 Blackbody ramethane release 1.1.1.1 Methane release from melting permafrost peat bogs 1.1.1.2 Methane release from hydrates 1.1.2 Abrupt increases in atmospheric methane 1.1.3 Decomposition 1.1.4 Peat decomposition 1.1.5 Rainforest drying 1.1.6 Forest fires 1.1.7 Desertification 1.1.8 CO2 in the oceans 1.1.9 Modelling results 1.1.9.1 Implications for climate policy 1.2 Cloud feedback 1.3 Gas release 1.4 Ice - albedo feedback 1.5 Water vapor feedback 2 Negative 2.1 Carbon cycle 2.1.1 Le Chatelier's principle 2.1.2 Chemical weathering 2.1.3 Net Primary Productivity 2.2 Lapse rate 2.3 Blackbody raMethane release from melting permafrost peat bogs 1.1.1.2 Methane release from hydrates 1.1.2 Abrupt increases in atmospheric methane 1.1.3 Decomposition 1.1.4 Peat decomposition 1.1.5 Rainforest drying 1.1.6 Forest fires 1.1.7 Desertification 1.1.8 CO2 in the oceans 1.1.9 Modelling results 1.1.9.1 Implications for climate policy 1.2 Cloud feedback 1.3 Gas release 1.4 Ice - albedo feedback 1.5 Water vapor feedback 2 Negative 2.1 Carbon cycle 2.1.1 Le Chatelier's principle 2.1.2 Chemical weathering 2.1.3 Net Primary Productivity 2.2 Lapse rate 2.3 Blackbody raMethane release from hydrates 1.1.2 Abrupt increases in atmospheric methane 1.1.3 Decomposition 1.1.4 Peat decomposition 1.1.5 Rainforest drying 1.1.6 Forest fires 1.1.7 Desertification 1.1.8 CO2 in the oceans 1.1.9 Modelling results 1.1.9.1 Implications for climate policy 1.2 Cloud feedback 1.3 Gas release 1.4 Ice - albedo feedback 1.5 Water vapor feedback 2 Negative 2.1 Carbon cycle 2.1.1 Le Chatelier's principle 2.1.2 Chemical weathering 2.1.3 Net Primary Productivity 2.2 Lapse rate 2.3 Blackbody ramethane 1.1.3 Decomposition 1.1.4 Peat decomposition 1.1.5 Rainforest drying 1.1.6 Forest fires 1.1.7 Desertification 1.1.8 CO2 in the oceans 1.1.9 Modelling results 1.1.9.1 Implications for climate policy 1.2 Cloud feedback 1.3 Gas release 1.4 Ice - albedo feedback 1.5 Water vapor feedback 2 Negative 2.1 Carbon cycle 2.1.1 Le Chatelier's principle 2.1.2 Chemical weathering 2.1.3 Net Primary Productivity 2.2 Lapse rate 2.3 Blackbody radiation

The study found that U.S. methane emissions could account for 30 to 60 percent of the global growth of atmospheric methane over the past decade.

Industry, with the full support of the administration, continues the fait accompli of radically expanded natural gas fracking across the country, with serious unresolved issues about fugitive atmospheric methane emissions and the potential for contamination of drinking water aquifers — and with no adequate federal regulatory structure in place.

Simultaneous observations of atmospheric ethane, compared with the ethane - to - methane ratio in the pipeline gas delivered to the region, demonstrate that natural gas accounted for ∼ 60 — 100 % of methane emissions, depending on season.

For the authors of the paper to assess the spectral results against theory they needed to know the atmospheric profile of temperature and humidity, as well as changes in the well - studied trace gases like CO2 and methane.

An instantaneous release, for example, would cause the atmospheric methane concentration to spike immediately, then decay back toward the unperturbed value on a time scale of approximately one decade.

Understanding, quantifying, and tracking atmospheric methane and emissions is essential for addressing concerns and informing decisions that affect the climate, economy, and human health and safety.

The atmospheric concentration of methane above the Arctic is the highest measured for the last 400,000 years, said the researchers.