Circulation Systems Over China



Introduction: The Earth's atmosphere is in continuous motion: movement which is
attempting to balance the constant differences in pressure and temperature
between different parts of the globe. It is this motion which carries water from
the ocean to the continents to provide precipitation and moves heat energy from
the tropical regions toward the poles, warming the high latitudes. It is this
circulation which plays a basic part in maintaining a steady state in the
atmosphere and generating the climatic zones which characterise different parts
of the earth. China, from its latitudinal location, mostly belongs to the mid-
latitudes, with a small part to the low latitudes. It is located at ...

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must exists. Therefore, for a close understanding of the circulation
system that operates over China, we should start from discussing the seasonal
pressure distribution at sea-level over the Asia-Pacific region, which is the
driving force for the air movements in China. Most clearly to be seen, the
largest difference in the atmospheric pressure occurs between winter and summer,
whereby January and July can be considered as representative months. In January,
a typical cold anticyclone with central pressure above 1,040 hectopascals (hPa)
developed over mid-Siberia and Mongolia (Mongolian High); while a strongly
established cyclone over the north-western Pacific Ocean (Aleutian Low). Since
both pressure systems practically lie in the same latitude of 50 to 55N, a
steep pressure gradient occurs which produces strong and persistent north-
westerlies over Northeast China. A third pressure system which affects China,
although limited only to south-eastern China, is the equatorial ...

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easterlies over the
Northwest. In contrast with the Mongolian High in winter, the heat low in July
is quite thick. In 500-hPa level, the low pressure cell still exists, which is
about the highest level it could attain. Even the surface winds over the Tibet
Plateau in West China are governed by the heat low during the summer season.
During winter as a whole, January experiences the strongest anticyclonic
pressure field; whereas in summer, the circulation over China is predominated by
the heat low centred at the Indian-Pakistan region. Long term records indicates
that the period from June to September comprises the summer pattern, typified by
July. The period from October to May comprises ...

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Circulation Systems Over China. (2007, October 18). Retrieved November 22, 2017, from http://www.essayworld.com/essays/Circulation-Systems-Over-China/72903
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"Circulation Systems Over China." Essayworld.com. October 18, 2007. Accessed November 22, 2017. http://www.essayworld.com/essays/Circulation-Systems-Over-China/72903.
"Circulation Systems Over China." Essayworld.com. October 18, 2007. Accessed November 22, 2017. http://www.essayworld.com/essays/Circulation-Systems-Over-China/72903.
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PAPER DETAILS
Added: 10/18/2007 12:17:14 PM
Category: Science & Nature
Type: Premium Paper
Words: 1879
Pages: 7

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