Содержание
- 2. Arctic haze Arctic haze is a thin, persistent, brown haze that causes limited visibility on the
- 4. This tinge or discoloration encourages the interpretation that the haze is absorbing light, and contains significant
- 5. Haze aerosols are mainly sulfate Estimates of the chemical composition of Arctic aerosol range from 30%
- 6. Main features Nearly all of the light scattering of the haze aerosol can be attributed to
- 7. The composition of haze has been used as a chemical fingerprint to identify its sources. The
- 8. Vertical profile information on Arctic haze aerosols has been widely obtained by lidar. In the vertical
- 9. The Arctic Haze, accompanied by high levels of gaseous air pollutants, was observed regularly since then
- 10. Surfaces of constant potential temperature form closed domes over the Arctic, with minimum values in the
- 11. Boreal forest fires are another large episodic source of Arctic air pollutants, particularly of black carbon
- 12. Why is Arctic haze important? First, it completely changed the earlier notion that aerosol pollution could
- 13. The haze absorbs and scatters solar energy The haze affects the highly reflective Arctic ice sheet
- 15. Скачать презентацию
Arctic haze
Arctic haze is a thin, persistent, brown haze that causes
Arctic haze
Arctic haze is a thin, persistent, brown haze that causes
From the ground, Arctic haze appears as a whitening of the sky near the horizon, with a reduction in visibility to a few kilometers or less. Viewed horizontally, from aircraft, the haze layers have a brownish tinge
This tinge or discoloration encourages the interpretation that the haze is
This tinge or discoloration encourages the interpretation that the haze is
Haze aerosols are mainly sulfate
Estimates of the chemical composition of Arctic
Haze aerosols are mainly sulfate
Estimates of the chemical composition of Arctic
Main features
Nearly all of the light scattering of the haze aerosol
Main features
Nearly all of the light scattering of the haze aerosol
Nearly all of the light absorption at visible wavelengths appears to be due to carbonaceous material (‘black carbon’, ‘soot’ or ‘graphitic carbon’).
The composition of haze has been used as a chemical fingerprint
The composition of haze has been used as a chemical fingerprint
Most of the particles originate in Eurasia. The transport routes for the haze are well understood. Eurasian emissions are much more important than those from North America, in part because the Eurasian sources are 5o to 10o further north than those in North America. Moreover, the Arctic air mass stretches relatively far south over the Eurasian landmass during the winter. The contaminants are thus picked up by the airmass that moves northward and over the pole in winter months.
Vertical profile information on Arctic haze aerosols has been widely obtained
Vertical profile information on Arctic haze aerosols has been widely obtained
The Arctic Haze, accompanied by high levels of gaseous air pollutants,
The Arctic Haze, accompanied by high levels of gaseous air pollutants,
Surfaces of constant potential temperature form closed domes over the Arctic,
Surfaces of constant potential temperature form closed domes over the Arctic,
Boreal forest fires are another large episodic source of Arctic air
Boreal forest fires are another large episodic source of Arctic air
Why is Arctic haze important?
First, it completely changed the earlier
Why is Arctic haze important?
First, it completely changed the earlier
Second, haze particles might give metals and other contaminants a free ride to and within the polar region. Metals as well as some persistent organic compounds adhere to aerosols and could be deposited along with the aerosols.
Arctic haze often appears in distinct bands at different heights because the warm dirty air is forced upward until it reaches the dome of cold air that sits over the North Pole in winter.
The clear, cold winter weather is one important reason why Arctic haze occurs in winter and spring and not in summer and fall.
In spite of their impact on visibility, the levels of sulfur compounds are much lower than those found in heavily polluted cities. Due largely to low deposition rates, the haze causes neither adverse effects on plants and animals, nor direct health problems in people.
The haze absorbs and scatters solar energy
The haze affects the highly
The haze absorbs and scatters solar energy
The haze affects the highly