The changing composition of the global

The role of feedback in global climate change is examined in the next section.

Global atmospheric change

In May , smoke from numerous fires burning in Mexico and Central America was transported into the southern U. In this study it was also estimated that the current Asian contributions to episodic ozone events over the western United States are in the range of ppb, and that future ozone episodes along the U. A model simulation by Yienger et al. Models are in good agreement with measurements for a variety of species in the mid-latitude stratosphere, with the possible exception of ozone O 3 at high altitude. One modeling study predicted that future developments in Asia could lead to emissions that will significantly perturb free tropospheric ozone chemistry over the Pacific Berntsen et al. Changes in atmospheric CO 2 and methane CH 4 have been associated with transitions between glacial and interglacial episodes Barnola et al. Attempts to predict changes in these driving forces and resulting emissions are highly uncertain when their time horizon extends as far as a hundred years into the future. The following is a discussion about some of the current and possible future effects of cross-border and intercontinental transport of air pollutants, with an emphasis on assessing the potential implications for U. Analysis of ozone data from U. A comprehensive set of long-term emission scenarios has recently been developed under the auspices of the IPCC Special Report on Emission Scenarios Nakicenovic and Swart, , which are based on a range of assumptions about the rate and direction of economic and technological change and the degree of globalization. Leadership The changing composition of the atmosphere, including its greenhouse gas and aerosol content, is a major internal forcing mechanism of climate change.

These wealthy industrial countries exported manufactured goods along with plenty of grains and minerals, in the case of the United States to less-wealthy developing countries.

In this sense, as with ocean circulation changes, such forcing should be more strictly regarded as secondary forcing or feedback. Mankind, through the burning of fossil fuels, forest clearing and other industrial processes, has increased the amount of carbon dioxide and other greenhouse gases since the eighteenth century.

Global changes in the atmosphere answer key

Long-range pollution transport is known to affect even very remote regions of the earth. The growth of developing economies and the post-war recoveries of Europe and Japan have helped turn poor and devastated countries into massive markets for U. Changes in the atmospheric content of aerosols, again both natural and anthropogenic can act as climate forcing mechanisms, or more usually secondary feedback mechanisms. In this study it was also estimated that the current Asian contributions to episodic ozone events over the western United States are in the range of ppb, and that future ozone episodes along the U. American companies, farmers, and workers have benefited immensely from these new commercial opportunities. Note that the total emissions of SO2 generally decrease over time in these scenarios, due to an assumed widespread implementation of emission control technologies. Increases in atmospheric turbidity aerosol abundance will affect the atmospheric energy budget by increasing the scattering of incoming solar radiation see section 1. Mankind, through the burning of fossil fuels, forest clearing and other industrial processes, has increased the amount of carbon dioxide and other greenhouse gases since the eighteenth century. One study found evidence that Asian boundary layer air can be transported to the upper troposphere over California in two to four days Kritz, The results of the six illustrative scenarios for emissions of SO2 and NOx over the next years are displayed in Figure marine boundary layer to be ppb, and the average concentrations of ozone to be 31 ppb.

American companies, farmers, and workers have benefited immensely from these new commercial opportunities. Such a situation will enhance the cooling associated with glacial periods.

how does the composition of the atmosphere affect climate

Changes in atmospheric CO 2 and methane CH 4 have been associated with transitions between glacial and interglacial episodes Barnola et al. It is argued that the Antarctic phenomenon is likely to persist: prompt drastic reduction in the emission of industrial halocarbons is required if the damage to stratospheric O 3 is to be reversed.

Obviously, then, changes in the atmospheric concentrations of greenhouse gases will modify the natural greenhouse effect, and consequently affect global climate.

The changing composition of the global

Models are in good agreement with measurements for a variety of species in the mid-latitude stratosphere, with the possible exception of ozone O 3 at high altitude.

Smoke from these fires was documented in Oklahoma Peppler,and satellite and ground-based observations showed this smoke plume extending northeastward into the Smoky Mountains Kreidenweis et al.

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The Changing Composition of Trade