Sentences with phrase «decreasing atmospheric concentrations»

Recent evidence suggests that decreasing atmospheric concentrations of carbon dioxide during this period may have initiated a steady and irreversible cooling trend over the next few million years.

In August, twenty - one young people, with the help of OCT, filed a landmark constitutional climate change lawsuit against the federal government, seeking a court order requiring the President to immediately implement a national plan to decrease atmospheric concentrations of carbon dioxide to a safe level: 350 ppm by the year 2100.

To decrease the global temperature long - term, you need to decrease the atmospheric concentration of the non-condensing greenhouse gases.

Not exact matches

The atmospheric concentration of benzene, for example, decreased by about 6,000 times, dramatically improving air quality.

After allowing for humidity and rainfall, they found that «aerosol optical thickness» — a measure of the concentration of atmospheric particles — decreased by only 10 to 15 per cent compared with the same periods in 2002 to 2007 (Geophysical Research Letters, in press).

This is a stunning finding because it means that recent reductions in atmospheric mercury concentrations (up to a 50 percent decrease in the last 20 years) have reversed the direction of mercury flows between the atmosphere and the peatland.,» says Mats Nilsson, SLU.

This has led to a large decrease in sulfur emissions, and less atmospheric deposition of sulfate to agricultural fields, and consequently, declining sulfate concentrations in rivers.

Stable atmospheric concentrations of greenhouse gases would lead to continued warming, but if carbon dioxide emissions could be eliminated entirely, temperatures would quickly stabilize or even decrease over time.

The letter notes that «Stable atmospheric concentrations of greenhouse gases would lead to continued warming, but if carbon dioxide emissions could be eliminated entirely, temperatures would quickly stabilize or even decrease over time.

However, elevated atmospheric CO2 concentrations and ocean acidification may also have an adverse impact on diatom growth, causing a decrease in cell size and possible further changes in phytoplankton composition.

As I understand this article, the decrease in temp gradient in the cool skin layer is what allows increases in atmospheric CO2 concentrations to further warm the oceans.

The higher concentrations of atmospheric carbon dioxide throughout the PETM decreased the nutritional value of plant material, however, leading to a temporary decrease in the size of some herbivorous insects and mammals.

If the surface ocean pCO2 concentrations continue to increase in proportion with the atmospheric CO2 increase, a doubling of atmospheric CO2 from preindustrial levels will result in a 30 % decrease in carbonate ion concentration and a 60 % increase in hydrogen ion concentration.

the atmospheric concentrations of CFCs [has] started to decrease.

We find that the global methane hydrate inventory decreases by approximately 70 % (35 %) under four times (twice) the atmospheric CO2 concentration and is accompanied by significant global oxygen depletion on a timescale of thousands of years.

- atmospheric CO2 d13C decrease over the last decades means it's CO2 added from biomass - atmospheric CO2 d14C decrease over the last decades means it's fossil CO2 - atmospheric O2 concentration decrease over the last decades means it's burning

So at the ocean surface, the atmospheric pressure remains relatively constant, increased CO2 concentrations lead to an increased partial pressure of CO2 but temperature leads to to a decreased solubility, partially canceling each other out.

If the surface ocean PCO2 concentrations continue to increase in proportion with the atmospheric CO2 increase, a doubling of atmospheric CO2 from preindustrial levels will result in a 30 % decrease in carbonate ion concentration and a 60 % increase in hydrogen ion concentration.

There are two ways mankind can increase atmospheric concentrations of GHGs: by increasing the strength of GHG sources (processes that produce GHGs) and by decreasing the strength of GHG sinks (processes that remove GHGs).

A large decrease in atmospheric CH4 concentrations (several tens of parts per billion; Spahni et al., 2003) reveals the widespread signature of the abrupt «8.2 ka event» associated with large - scale atmospheric circulation change recorded from the Arctic to the tropics with associated dry episodes (Hughen et al., 1996; Stager and Mayewski, 1997; Haug et al., 2001; Fleitmann et al., 2003; Rohling and Palike, 2005).

Elevated atmospheric CO2 is associated with decreased plant nitrogen concentration, and therefore decreased protein, in many crops, such as barley, sorghum, and soy.210, 211,212,213 The nutrient content of crops is also projected to decline if soil nitrogen levels are suboptimal, with reduced levels of nutrients such as calcium, iron, zinc, vitamins, and sugars, although this effect is alleviated if sufficient nitrogen is supplied.214 Fourth, farmers are expected to need to use more herbicides and pesticides because of increased growth of pests215, 216,217,218 and weeds219, 220 as well as decreased effectiveness221 and duration222of some of these chemicals (Ch.

Together with the long - term decrease of 15 p.p.m.v. during the past four glacial cycles, we suggest significant slow fluctuations in the atmospheric CO2 concentration on timescales of several 105 years, probably influenced by changes in the weathering14 or by major reorganizations in the carbon reservoir of the global ocean15.

With all the hydrocarbons we burn it is my understanding that atmospheric oxygen concentration has been steadily decreasing.

If we were to engineer as sudden increase in C12 and C13 — containing CO2 in the atmosphere, then measure the decrease of the atmospheric concentration of these two isotopes over time, we would have answered the basic question above by direct measurement.

In addition, he discussed the increase of atmospheric greenhouse gas concentrations and the consequent anthropogenic warming of the climate system, decrease in sea ice and increase in ocean acidity.

This means it will take centuries to millennia for deep ocean temperatures to warm in response to today's surface conditions, and at least as long for ocean warming to reverse after atmospheric greenhouse gas concentrations decrease (virtually certain).

(2) «over the past century, the temperature change has not always been consistent with the change of CO2 concentration,» since «for several periods, global temperatures decreased or were stable while the atmospheric CO2 concentration continuously increased,»

During the 50 y in which the atmospheric concentration of CO2 has increased considerably, the temperature has decreased.

In the coming century, increasing atmospheric GHG concentration and associated warming could have important hydrological and water resource consequences in the Southwest resulting from mean state changes due to higher evaporation and decreased precipitation [73 — 75].

True, ice cores vary fairly slowly, probably because they represent a several hundred year averaging (due to diffusion plus an unknown decrease due to absorption) in actual atmospheric concentrations.

Elsewhere on this site there is a graph of overall ocean heat content which is building indicating that while the sst is decreasing slightly the overall ocean is warming, It is likely that this overall ocean warming which has nothing to do with changes to the atmospheric temperature because it is the sea surface and not the deep ocean that is in contact with the atmosphere is what is resulting in the overall rise in atmospheric CO2 concentration which is currenly increasing at 2ppmv / year.

Measurement of CO2 concentration is always problematic; the «Standard Dry Air» SDA basis of measurement and comparison is at standard temperature and pressure which is a non-existent parameter; and as we are seeing, CO2 is not a well - mixed gas at all and will be defined by, amongst other variables, SH, or absolute humidity; SH can vary from 0 to 5 % by volume of atmosphere; as the SH increases, the absolute amount of other gases, including CO2, decreases; to say therefore that atmospheric concentrations of CO2 have remained stable and not been above 280ppm over the last 650my is fanciful; even if you assume past CO2 levels have not got above 280ppm the range of variation within that limit has been greater than the current increase;

Three analyses of the NASA NVAP satellite data show little or no empirical correlation between either surface temperature or atmospheric carbon dioxide concentration, Solomon et al in fact shows a 10 % decrease in stratospheric water vapour in the decade pre-2000.

Most of the GMT drop has been attributed to radiative forcing decreases from increased albedo due to equatorward ice extension and from decreased greenhouse gas concentrations; vegetation and atmospheric dust are thought to play secondary roles (20, 21).

One can make this quite a bit more complicated, because as you correctly note the magnitude of the gross fluxes (e.g., natural sinks) isn't independent of the atmospheric concentration, so one can't just say that if we removed all human emissions the net natural flux would still be negative and atmospheric CO2 would be decreasing.

Increasing atmospheric CO2 concentrations lower oceanic pH and carbonate ion concentrations, thereby decreasing the saturation state with respect to calcium carbonate (Feely et al., 2004).

Scientific confidence of the occurrence of climate change include, for example, that over at least the last 50 years there have been increases in the atmospheric concentration of CO2; increased nitrogen and soot (black carbon) deposition; changes in the surface heat and moisture fluxes over land; increases in lower tropospheric and upper ocean temperatures and ocean heat content; the elevation of sea level; and a large decrease in summer Arctic sea ice coverage and a modest increase in Antarctic sea ice coverage.

«The above - ground nuclear tests that occurred in several countries between 1955 and 1980 (see nuclear test list) dramatically increased the amount of carbon - 14 in the atmosphere and subsequently in the biosphere; after the tests ended, the atmospheric concentration of the isotope began to decrease.»

It means if CO ₂ emissions were decreased right now to a level that matches natural removal rate, that is, if atmospheric CO ₂ concentration flatlined from now on, in 70 years we could avoid a warming in the range of 0.35 °C to 0.88 °C.

Later, from 1980 to 2000, the atmospheric trend of GEM concentrations and global estimates of anthropogenic emissions of mercury to the atmosphere (mainly emissions from coal combustion) exhibit a similar trend: a large decrease during the 1980s and then stabilization between 1990 and 2000 (3, 50, 51).

From 1990 to 1996, a decrease in atmospheric GEM concentrations was observed at both the Wank and Lista stations, with higher levels at Wank (Fig. 3).

Simply put the physical data refutes the IPCC contention that the atmospheric CO2 concentration is increasing because of increaseing CO2 emissions from fossil fuels because the rate of atmospheric CO2 concentration is actually decreasing with increased emissions.

The letter notes that «Stable atmospheric concentrations of greenhouse gases would lead to continued warming, but if carbon dioxide emissions could be eliminated entirely, temperatures would quickly stabilize or even decrease over time.

Stable atmospheric concentrations of greenhouse gases would lead to continued warming, but if carbon dioxide emissions could be eliminated entirely, temperatures would quickly stabilize or even decrease over time.

In addition to this natural variability, humans have perturbed climate by increasing atmospheric CO2 concentrations, which have increased ocean temperatures, water column stratification, hypoxia, and water column anoxia and have decreased surface ocean pH [6], [7].

By analyzing trends in the time series of atmospheric CO2, we see clear evidence of an initial decrease in atmospheric CO2 concentrations over the tropical Pacific Ocean, specifically during the early stages of the El Niño event (March through July 2015).

The atmospheric lifetime of a species therefore measures the time required to restore equilibrium following a sudden increase or decrease in its concentration in the atmosphere.

An albedo decrease of only 1 %, bringing the Earth's albedo from 30 % to 29 %, would cause an increase in the black - body radiative equilibrium temperature of about 1 °C, a highly significant value, roughly equivalent to the direct radiative effect of a doubling of the atmospheric CO2 concentration.

Measured decreases in the fraction of other forms of carbon (the isotopes 14C and 13C) and a small decrease in atmospheric oxygen concentration (observations of which have been available since 1990) show that the rise in CO2 is largely from combustion of fossil fuels (which have low 13C fractions and no 14C).

# 195 — «Ending emissions starts a decrease in atmospheric concentration of carbon dioxide, and within five years or so, an end to land surface temperature increase.»