Sentences with phrase «term ozone changes»

Not exact matches

Long - term risks can arise from purely social causes (e.g., those associated with political or economic institutions, violence, and technology), but often arise from the interaction of humans with the Earth system (e.g., climate change; ozone depletion; resource depletion; pandemics; flood and seismic risk in areas subject to increasing development).

The burning of agricultural residue causes severe pollution in land, water and air and contributes to increased ozone levels and climate change in the long term.

* The role of the US in global efforts to address pollutants that are broadly dispersed across national borders, such as greenhouse gasses, persistent organic pollutants, ozone, etc...; * How they view a president's ability to influence national science policy in a way that will persist beyond their term (s), as would be necessary for example to address global climate change or enhancement of science education nationwide; * Their perspective on the relative roles that scientific knowledge, ethics, economics, and faith should play in resolving debates over embryonic stem cell research, evolution education, human population growth, etc... * What specific steps they would take to prevent the introduction of political or economic bias in the dissemination and use of scientific knowledge; * (and many more...)

Although (1) the effects of a pH change have been demonstrated in the lab, and (2) it's a longer - term change than ozone depletion, which fixes itself on a time scale of decades after freon emission is stopped.

The dominant driver of these trends is increasing greenhouse forcing, although there may be contributions from anthropogenic changes of the ozone layer and long - term increase of geomagnetic activity throughout the 20th century.

What I miss is their assertion: «The dominant driver of these trends is increasing greenhouse forcing, although there may be contributions from anthropogenic changes of the ozone layer and long - term increase of geomagnetic activity throughout the 20th century».

Observations from satellites and balloons suggest that ozone abundances have decreased in the tropical lower stratosphere since the late 1970s, but this long - term change is occurring in a region of large interannual variability.

As of this writing, there is observational and modeling evidence that: 1) both annular modes are sensitive to month - to - month and year - to - year variability in the stratospheric flow (see section on Stratosphere / troposphere coupling, below); 2) both annular modes have exhibited long term trends which may reflect the impact of stratospheric ozone depletion and / or increased greenhouse gases (see section on Climate Change, below); and 3) the NAM responds to changes in the distribution of sea - ice over the North Atlantic sector.

-- The second, being the observed change of some trees» CO2 - enhanced growth storing more carbon in their standing wood, is of very limited potential and is not rising at anywhere near the rate of the countervailing increase since 1980 of the impacts on forests of droughts, heat waves and surface ozone concentrations in terms of growth - suppression and of pests, ailments, dieback and rising frequency, duration and intensity of wildfires.

It is emphasized, however, that not all aspects of the SH climate response to stratospheric ozone forcing can be understood in terms of changes in the midlatitude jet.

erlhapp (16:21:33): Look at the Hood presentation They even say «Conclusion: The ozone solar cycle response coefficients calculated using a standard multiple regression statistical model do not change significantly when an ENSO term is added to the model».

Long - term trends in the upper atmosphere - ionosphere are a complex problem due to simultaneous presence of several drivers of trends, which behave in a different way: increasing atmospheric concentration of greenhouse gases, mainly CO2, long - term changes of geomagnetic and solar activity, secular change of the Earth's main magnetic field, remarkable long - term changes of stratospheric ozone concentration, and very probably long - term changes of atmospheric dynamics, particularly of atmospheric wave activity (Lastovicka 2009; Qian et al. 2011; Lastovicka et al. 2012).

Possible correlations between solar ultraviolet variability and climate change have previously been explained in terms of changes in ozone heating influencing stratospheric weather.

Mesospheric temperature trends at mid-latitudes in summer, Berger et al, 11/2011; ``... This large cooling is primarily caused by long - term changes of ozone in the upper stratosphere in combination with a CO2 increase.»

Although biogenic NMVOC emissions increase with increasing temperature, all three studies concur that climate - driven changes in vegetation types unfavourable to isoprene emissions (notably the recession of tropical forests) would partly compensate for the effect of warming in terms of ozone generation.

In terms of atmospheric chemistry, a strong consensus was reached for the first time that science could predict the changes in tropospheric ozone in response to scenarios for CH4 and the indirect greenhouse gases (CO, NOx, VOC) and that a quantitative GWP for CO could be reported.