Sentences with phrase «chemical changes in the atmosphere»

«It is easy to forget that the entire Earth is experiencing a drastic chemical change in our atmosphere,» says Pau.

Besides searching for water, geologists will use Webb to study the formation and evolution of global dust storms and cloud systems over dormant volcanoes, and search for traces of chemical changes in the atmosphere.

Not exact matches

The second is that our industrialized economy is responsible for changes in the chemical composition of the atmosphere.

«Our results indicate that a wide range of POPs have been remobilized into the Arctic atmosphere over the past two decades as a result of climate change, confirming that Arctic warming could undermine global efforts to reduce environmental and human exposure to these toxic chemicals,» write the scientists, whose analysis was published yesterday in the journal Nature Climate Cchange, confirming that Arctic warming could undermine global efforts to reduce environmental and human exposure to these toxic chemicals,» write the scientists, whose analysis was published yesterday in the journal Nature Climate ChangeChange.

The ability to make and study cubic ice in the laboratory could improve computer models of how clouds interact with sunlight and the atmosphere — two keys to understanding climate change, said Barbara Wyslouzil, project leader and professor of chemical and biomolecular engineering at The Ohio State University.

Isaacman - VanWertz and his collaborators were able to, for the first time, fully track the carbon in the pinene molecules from start to finish as they underwent chemical changes as they would in the atmosphere.

For the first time, this study allowed researchers to analyse the effects of the climate change on the forest nutrient cycles, and states that Pyrenean forests can register these episodes chemical mark at a global scale (for instance, volcanic eruptions in remote areas) and the effects of gas emissions into the atmosphere since the Industrial Revolution.

This is because warmer temperatures and other changes in the atmosphere related to a changing climate, including higher atmospheric levels of methane, spur chemical reactions that lead to ozone.

«A lot of what we do is looking in the earth's past because this allows us to see how the chemical composition of the atmosphere has been changing over large stretches of time.»

The motions of the planets have been well established for centuries, the chemical abundances in their atmospheres have been analyzed more recently and the changes in their structure, atmospheres and physical appearance have been noted with repeated observations from ground - and space - based observatories.

«As climate changes and the planet gets warmer, that drives the chemical reactions that create pollutants like ozone and fine particulate matter in the atmosphere,» said lead researcher Jason West.

Source: Lyman 2010 The reaction of the oceans to climate change are some of the most profound across the entire environment, including disruption of the ocean food chain through chemical changes caused by CO2, the ability of the sea to absorb CO2 being limited by temperature increases, (and the potential to expel sequestered CO2 back into the atmosphere as the water gets hotter), sea - level rise due to thermal expansion, and the amount of water vapour in the atmosphere.

The Earth's climate is predicted to change over time, in part because human activities are altering the chemical composition of the atmosphere through the buildup of greenhouse gases - primarily carbon dioxide, methane, and nitrous oxide.

Once the ice reaches the equator, the equilibrium climate is significantly colder than what would initiate melting at the equator, but if CO2 from geologic emissions build up (they would, but very slowly — geochemical processes provide a negative feedback by changing atmospheric CO2 in response to climate changes, but this is generally very slow, and thus can not prevent faster changes from faster external forcings) enough, it can initiate melting — what happens then is a runaway in the opposite direction (until the ice is completely gone — the extreme warmth and CO2 amount at that point, combined with left - over glacial debris available for chemical weathering, will draw CO2 out of the atmosphere, possibly allowing some ice to return).

The upper atmosphere is generally cooling and contracting, and related changes in chemical composition are affecting the ionosphere.

An alternative solution to climate change could be to distribute fine paint particles in the upper atmosphere, says a UK chemical engineer.

Our research team has spent the past two decades examining the chemical composition of the longest - lived animal that doesn't live in a colony known to science — the ocean quahog clam — to find out how the climate of the North Atlantic ocean has changed in relation to the atmosphere.

«They find that tropospheric temperature records must be at least 17 years long to discriminate between internal climate noise and the signal of human - caused changes in the chemical composition of the atmosphere.

Other leading theories to causes of mass extinctions include: global climate change, changes in sea level, chemical poisoning of the atmosphere and / or oceans, variation in solar radiation, and extreme volcanic activity.

For example, Wallace S. Broecker — easily the most vigorous of the geoscientists in trying to alert the scientific community, and author of several Scientific American articles — was awarded the U.S. National Medal of Science by President Clinton in 1996 for «contributions to understanding chemical changes in the ocean and atmosphere.»

Source: Lyman 2010 The reaction of the oceans to climate change are some of the most profound across the entire environment, including disruption of the ocean food chain through chemical changes caused by CO2, the ability of the sea to absorb CO2 being limited by temperature increases, (and the potential to expel sequestered CO2 back into the atmosphere as the water gets hotter), sea - level rise due to thermal expansion, and the amount of water vapour in the atmosphere.

A potentially game - changing breakthrough in artificial photosynthesis has been achieved with the development of a system that can capture carbon dioxide emissions before they are vented into the atmosphere and then, powered by solar energy, convert that carbon dioxide into valuable chemical products, including biodegradable plastics, pharmaceutical drugs and even liquid fuels.

Jim, the bottom line for me is that for the earth to be in radiative thermal equiibrium with the sun, it has not been demonstrated that any change in chemical composition of the earth or atmosphere is able to affect the equilibrium temperature, providing this does not change albedo.

The climate has changed many times in the past, but this time it is changing rapidly because of chemicals that humans are adding to the atmosphere.

Ideal gas which has no mass therefore no weight under gravity because there is nothing on which gravity can pull; which has no volume therefore does not expand or condense changing its weight under reduced and increased pressure or heat and cold and so does not become lighter or heavier than air under gravity; with no attraction therefore merely capable of bouncing off another and not capable of undergoing chemical changes, such as water and carbon dioxide in the atmosphere forming carbonic acid.

Here, the same model run is repeated several times with different starting conditions but with the same boundary conditions, such as a prescribed change in the chemical composition of the atmosphere.

As a smaller fraction of the excess CO2 goes into the oceans, a larger fraction may remain in the atmosphere, and the chemical changes in seawater that can affect organisms will continue to grow in lockstep with the relentless increases in the excess CO2 in the overlying atmosphere caused by human activities.

The Ozone and Water Vapor Group conducts research on the nature and causes of the depletion of the stratospheric ozone layer and the role of stratospheric and tropospheric ozone and water vapor in forcing climate change and in modifying the chemical cleansing capacity of the atmosphere.

The only amplifier that has changed appreciably in recent memory is the amount of GHGs in the atmosphere — methane and CO2 from agriculture, CO2 from energy consumption, industrial chemicals, and so on.

Now, you might be saying, if there were significant chemical reactions happening in the atmosphere, why isn't the composition changing over time.

The planetary boundaries hypothesis, first introduced by a group of leading earth scientists in a 2009 article in Nature, posits that there are nine global, biophysical limits to human welfare: climate change, ocean acidification, the ozone layer, nitrogen and phosphate levels, land use change (the conversion of wilderness to human landscapes like farmland or cities), biodiversity loss, chemical pollutants, and particulate pollution in the atmosphere.

During the past 500 years or so, human activities have released mercury from its relatively stable and water - insoluble form (cinnabar) in rocks and soil through mining, fossil fuel combustion, and other activities, and so have increased the portion of mercury that is actively cycling through the atmosphere, surface waters, plants, and animals as it changes chemical and physical form.