Sentences with phrase «global atmospheric conditions»
Changing global atmospheric conditions are giving rise to an increase in this activity.
https://www.trustedchoice.com/ Not exact matches
The US and global transportation systems rely on a deep understanding of atmospheric conditions and long - term weather patterns.
After confirming that oxidized organics are involved in the formation and growth of particles under atmospheric conditions, the scientists incorporated their findings into a global particle formation model.
Conclusion: Global warming was primarily responsible, due equally to the thinning sea ice and warm atmospheric conditions.
These conditions occur when the jet stream, a global atmospheric wave of air that encompasses the Earth, becomes stationary and the peaks and troughs remain locked in place.
They used the Community Earth System Model, funded primarily by the Department of Energy and NSF, to simulate global climate as well as atmospheric chemistry conditions.
To simulate the interplay of global climate with regional pollution conditions, the scientists turned to two of the world's leading atmospheric models, both based at NCAR and developed through broad collaborations with the atmospheric science community.
This changed ocean chemistry and reduced atmospheric CO2 levels, which increased global ice coverage and propelled Earth into severe icehouse conditions.
In other research around atmospheric dynamics of tidally locked exoplanets, there could be a situation where the world has efficient «air conditioning» — hot air from one hemisphere is distributed about the planet in such a way to balance global temperatures.
As the authors point out, even if the whole story comes down to precipitation changes which favor ablation, the persistence of these conditions throughout the 20th century still might be an indirect effect of global warming, via the remote effect of sea surface temperature on atmospheric circulation.
However, atmospheric CO2 content plays an important internal feedback role.Orbital - scale variability in CO2 concentrations over the last several hundred thousand years covaries (Figure 5.3) with variability in proxy records including reconstructions of global ice volume (Lisiecki and Raymo, 2005), climatic conditions in central Asia (Prokopenko et al., 2006), tropical (Herbert et al., 2010) and Southern Ocean SST (Pahnke et al., 2003; Lang and Wolff, 2011), Antarctic temperature (Parrenin et al., 2013), deep - ocean temperature (Elder eld et al., 2010), biogeochemical conditions in the Northet al., 2008).
Whether the activity of TCs (TC - scale dynamics and cumulus convection together) is determined by the global climatic condition (SST, atmospheric composition and general circulation).
The second order effect of increasing cloudiness caused by more GCRs when «atmospheric conditions are suitable» for the formation of high clouds due to the other effects of global warming should be warming.
I've been wondering, what's the lower thermal boundary condition for full Global Climate Models (GCMs), atmospheric or, perhaps more importantly, oceanic?
Small changes in initial conditions drive abrupt and nonlinear change evident in many of the global ocean and atmospheric indices — and indeed in the surface temperature trajectory.
Type 2 dynamic downscaling refers to regional weather (or climate) simulations in which the regional model's initial atmospheric conditions are forgotten (i.e., the predictions do not depend on the specific initial conditions), but results still depend on the lateral boundary conditions from a global numerical weather prediction where initial observed atmospheric conditions are not yet forgotten, or are from a global reanalysis.
That said, geophysics unequivocally demonstrate that in long - term global contexts of (say) minimum 10 - million years, solar - driven atmospheric - oceanic conditions reflect the underlying reality not of «climate» but of plate tectonics.
Type 3 dynamic downscaling takes lateral boundary conditions from a global model prediction forced by specified real world surface boundary conditions, such as for seasonal weather predictions based on observed sea surface temperatures, but the initial observed atmospheric conditions in the global model are forgotten.
«We see some trends that are linked with changes in atmospheric conditions, such as more water content in the atmosphere due to global warming,» Hoppe says.
«The authors write that «the El Niño - Southern Oscillation (ENSO) is a naturally occurring fluctuation,» whereby «on a timescale of two to seven years, the eastern equatorial Pacific climate varies between anomalously cold (La Niña) and warm (El Niño) conditions,» and that «these swings in temperature are accompanied by changes in the structure of the subsurface ocean, variability in the strength of the equatorial easterly trade winds, shifts in the position of atmospheric convection, and global teleconnection patterns associated with these changes that lead to variations in rainfall and weather patterns in many parts of the world,» which end up affecting «ecosystems, agriculture, freshwater supplies, hurricanes and other severe weather events worldwide.»»
As the earth continues to recover from the abnormally cold conditions of the centuries - long Little Ice Age, warmer temperatures, improving soil moisture, and more abundant atmospheric carbon dioxide have helped bring about a golden age for global agricultural production.
It should be clear that this great and constant roar of atmospheric air conditioning is an important part of the global energy budget should figure significantly into any model of the global climate however the mighty creature overhead, along with all his cousins, is too small to show up in even the biggest and grandest global climate models.»
The most likely candidate for that climatic variable force that comes to mind is solar variability (because I can think of no other force that can change or reverse in a different trend often enough, and quick enough to account for the historical climatic record) and the primary and secondary effects associated with this solar variability which I feel are a significant player in glacial / inter-glacial cycles, counter climatic trends when taken into consideration with these factors which are, land / ocean arrangements, mean land elevation, mean magnetic field strength of the earth (magnetic excursions), the mean state of the climate (average global temperature), the initial state of the earth's climate (how close to interglacial - glacial threshold condition it is) the state of random terrestrial (violent volcanic eruption, or a random atmospheric circulation / oceanic pattern that feeds upon itself possibly) / extra terrestrial events (super-nova in vicinity of earth or a random impact) along with Milankovitch Cycles.
The Early Anthropogenic Hypothesis (108) posits that mid-Holocene increases in CO2 and CH4 resulted from early land clearing and other agricultural practices and that these unprecedented interglacial trends in atmospheric composition set global climate on a trajectory toward warmer conditions long before human use of fossil fuels (108, 109).
Although atmosphere — ocean models have difficulty replicating Pliocene climate, atmospheric models forced by specified surface boundary conditions are expected to be capable of calculating global surface temperature with reasonable accuracy.
In the context of models that include cloud processes, ranging from small - scale models of clouds and atmospheric chemistry to global weather and climate models, the unified theoretical foundations presented here provide the basis for incorporating cloud microphysical processes in these models in a manner that represent the process interactions and feedback processes over the relevant range of environmental and parametric conditions.
In their paper «Exploring recent trends in Northern Hemisphere blocking,» Barnes and colleagues used various meteorological definitions of «blocking» along with various datasets of atmospheric conditions to assess whether or not there have been any trends in the frequency of blocking events that could be tied to changes in global warming and / or the declines in Arctic sea ice.
The blanket - exemption treatment is based on increasingly questionable assertions that wind turbines reduce atmospheric carbon dioxide levels that supposedly cause global warming, climate change, extreme weather events and an amazing number of dog, people, Italian pasta, prostitution and other exaggerated or imaginary problems, plus others that exist only in computer models whose forecasts and scenarios bear no resemblance to Real World conditions or events.
We study climate sensitivity and feedback processes in three independent ways: (1) by using a three dimensional (3 - D) global climate model for experiments in which solar irradiance So is increased 2 percent or CO2 is doubled, (2) by using the CLIMAP climate boundary conditions to analyze the contributions of different physical processes to the cooling of the last ice age (18K years ago), and (3) by using estimated changes in global temperature and the abundance of atmospheric greenhouse gases to deduce an empirical climate sensitivity for the period 1850 - 1980.
«Yet, they know very well that there is not one «global» climate, but a large variety of climates, depending on latitude, geographic conditions, and atmospheric dynamics.»
In the article «Global atmospheric particle formation from CERN CLOUD measurements,» sciencemag.org, 49 authors concluded «Atmospheric aerosol nucleation has been studied for over 20 years, but the difficulty of performing laboratory nucleation - rate measurements close to atmospheric conditions means that global model simulations have not been directly based on experimental datGlobal atmospheric particle formation from CERN CLOUD measurements,» sciencemag.org, 49 authors concluded «Atmospheric aerosol nucleation has been studied for over 20 years, but the difficulty of performing laboratory nucleation - rate measurements close to atmospheric conditions means that global model simulations have not been directly based on experimental datglobal model simulations have not been directly based on experimental data.....
According to the NOAA Climate Prediction Center, the U.S. government agency tasked with monitoring, assessing and predicting the El Niño Southern Oscillation, or ENSO, cycle (El Niño and La Niña), current global atmospheric circulation and precipitation patterns are consistent with ENSO - neutral conditions in the tropical Pacific.
114, D19101, 12 PP., 2009 doi: 10.1029 / 2009JD011800 «Global atmospheric downward longwave radiation over land surface under all - sky conditions from 1973 to 2008» Kaicun Wang, Shunlin Liang
Moreover, since DLR varies widely according to atmospheric conditions, it is very important to achieve enough coverage to be sure that we understand how the localized measurements can be generalized to the global scale.
They also ran atmospheric models that used observed global sea surface temperatures, Arctic sea ice conditions and atmospheric carbon dioxide concentrations in 2010 to assess whether such factors might have contributed to the heat wave.
Scientists expect rainfall extremes to change in Europe under future climate conditions responding to changes in large - scale atmospheric circulation driven by global warming.
Since forests are — in general — agencies that absorb atmospheric carbon, and help cool the planet, any loss can only accelerate global warming and create even more difficult conditions for the surviving woodlands.
A prerequisite was the growth of very large Northern Hemisphere ice sheets, whose subsequent collapse created stadial conditions that disrupted global patterns of ocean and atmospheric circulation.