Resulting changes in the atmospheric temperature structure, including from surface dimming, in turn affect regional circulation and precipitation patterns.
Not exact matches
The
results suggest that the impact of sea ice seems critical for the Arctic surface
temperature changes, but the
temperature trend elsewhere seems rather due mainly to
changes in ocean surface
temperatures and
atmospheric variability.
The team analyzed an index of sea surface
temperatures from the Bering Sea and found that
in years with higher than average Arctic
temperatures,
changes in atmospheric circulation
resulted in the aforementioned anomalous climates throughout North America.
While ECS is the equilibrium global mean
temperature change that eventually
results from
atmospheric CO2 doubling, the smaller TCR refers to the global mean
temperature change that is realised at the time of CO2 doubling under an idealised scenario
in which CO2 concentrations increase by 1 % yr — 1 (Cubasch et al., 2001; see also Section 8.6.2.1).
Some global warming «skeptics» argue that the Earth's climate sensitivity is so low that a doubling of
atmospheric CO2 will
result in a surface
temperature change on the order of 1 °C or less, and that therefore global warming is nothing to worry about.
Scientists agree that a doubling of
atmospheric CO2 levels could
result in temperature increases of between 1.5 and 4.5 °C, caused by rapid
changes such as snow and ice melt, and the behaviour of clouds and water vapour.
In a series of papers, we've shown that the warmer temperatures observed over the WAIS are the result of those same atmospheric circulation changes, which are not related to the SAM, but rather to the remote forcing from changes in the tropical Pacific: changes in the character of ENSO (Steig et al., 2012; Ding et al., 2011; 2012
In a series of papers, we've shown that the warmer
temperatures observed over the WAIS are the
result of those same
atmospheric circulation
changes, which are not related to the SAM, but rather to the remote forcing from
changes in the tropical Pacific: changes in the character of ENSO (Steig et al., 2012; Ding et al., 2011; 2012
in the tropical Pacific:
changes in the character of ENSO (Steig et al., 2012; Ding et al., 2011; 2012
in the character of ENSO (Steig et al., 2012; Ding et al., 2011; 2012).
Seeing this as a baseline, positive CO2 feedback from
temperature changes, or a running out of capacity for greater uptake from CO2 accumulation, would be seen as adding more CO2 to the air
in addition to anthropogenic releases, but it would have to surpass some level before it would
result in a total
atmospheric accumulation of CO2 greater than anthropogenic emissions (first, as a rate, and later, cummulative
change).
The
changes in atmospheric CO2 concentration
resulting from human consumption of fossil fuels cause most of both the
temperature increase and the
changes in the seasonal cycle.»
With one band (along with the convective lapse rate below the tropopause) establishing the
atmospheric temperature profile, adding some other band of absorption may
result in some different pattern of
temperature change.
The
atmospheric Greenhouse Effect merely sets a theoretical background
atmospheric temperature level that is continually overridden as a
result of the size of the constant interlinked
changes in both the solar and oceanic heat inputs.
For example, let's say that evidence convinced me (
in a way that I wasn't convinced previously) that all recent
changes in land surface
temperatures and sea surface
temperatures and
atmospheric temperatures and deep sea
temperatures and sea ice extent and sea ice volume and sea ice density and moisture content
in the air and cloud coverage and rainfall and measures of extreme weather were all directly tied to internal natural variability, and that I can now see that as the
result of a statistical modeling of the trends as associated with natural phenomena.
While ECS is the equilibrium global mean
temperature change that eventually
results from
atmospheric CO2 doubling, the smaller TCR refers to the global mean
temperature change that is realised at the time of CO2 doubling under an idealised scenario
in which CO2 concentrations increase by 1 % yr — 1 (Cubasch et al., 2001; see also Section 8.6.2.1).
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.
Despite a half century of climate
change that has significantly affected
temperature and precipitation patterns and has already had widespread ecological and hydrological impacts, and despite a near certainty that the United States will experience at least as much climate
change in the coming decades, just as a
result of the current
atmospheric concentrations of greenhouse gases, those organizations
in the public and private sectors that are most at risk, that are making long - term investments and commitments, and that have the planning, forecasting and institutional capacity to adapt, have not yet done so.
States that other feedbacks likely to emerge are those
in which key processes include surface fluxes of trace gases,
changes in the distribution of vegetation,
changes in surface soil moisture,
changes in atmospheric water vapor arising from higher
temperatures and greater areas of open ocean, impacts of Arctic freshwater fluxes on the meridional overturning circulation of the ocean, and
changes in Arctic clouds
resulting from
changes in water vapor content
The seasonal climate may relate to
changes in the ocean circulation pattern prior to 4.6 Ma that
resulted in an increased
temperature and
atmospheric pressure gradient between the east coast of North America and the Atlantic Ocean, but this climate phase seems to be only a temporary condition, as underlying and overlying sediment are both consistent with drier conditions.
We can all observe the greening that more
atmospheric CO2 brings, but this greening is unlikely to
result in measurable surface
temperature change.
The authors developed scenarios of global CO2 emissions from existing infrastructure directly emitting CO2 to the atmosphere for the period 2010 to 2060 (with emissions approaching zero at the end of this time period) and used the University of Victoria Earth System Climate Model to project the
resulting changes in atmospheric CO2 and global mean
temperature.
Other hypotheses, predict the opposite — that the
atmospheric response will counteract the CO2 increase and
result in insignificant
changes in global
temperature.
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.
Long - term Cenozoic
temperature trends, the warming up to about 50 Myr before present (BP) and subsequent long - term cooling, are likely to be, at least
in large part, a
result of the
changing natural source of
atmospheric CO2, which is volcanic emissions that occur mainly at continental margins due to plate tectonics (popularly «continental drift»); tectonic activity also affects the weathering sink for CO2 by exposing fresh rock.
It is well known that a doubling of
atmospheric CO2 levels could
result in temperature increases of between 1.5 and 4.5 °C, due to fast
changes such as snow and ice melt, and the behaviour of clouds and water vapour.
In the idealised situation that the climate response to a doubling of
atmospheric CO2 consisted of a uniform
temperature change only, with no feedbacks operating (but allowing for the enhanced radiative cooling
resulting from the
temperature increase), the global warming from GCMs would be around 1.2 °C (Hansen et al., 1984; Bony et al., 2006).
The IPCC defines Equilibrium climate sensitivity as the
change in global mean
temperature that
results when the climate system, or a climate model, attains a new equilibrium with the forcing
change resulting from a doubling of the
atmospheric CO2 concentration.
When heavy rainfall probabilities were next investigated
in ensembles of two
atmospheric general circulation models, run with and without anthropogenically - induced sea surface
temperature changes,
results were model - dependent.
Project
changes in average global
temperature and / or climate
resulting from these future
atmospheric GHG concentrations;
The
changing sea surface
temperatures influence
atmospheric movements
in the Tropical Convergence Zone
resulting in periods of more frequent and intense El Nino and, alternatively, periods of more frequent and intense La Nina.
The test
results indicate that the radiative forcing due to
changes in the
atmospheric concentrations of CO2, CH4, CFCs, and N2O, emissions of SOX, CO2, CH4, and CFCs and solar irradiance contain a unit root while most tests indicate that
temperature does not.