Characteristics of the spatial distribution and yearly variation of aerosol optical depth over China in last 30 years

Details Characteristics of the spatial distribution and yearly variation of aerosol optical depth over China in last 30 years Characteristics of the spatial distribution and yearly variation of aerosol optical depth over China in last 30 years

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jgr...10614501l&link_type=abstract

Journal of Geophysical Research, Volume 106, Issue D13, p. 14501-14514

Mathematics

Logic

57

Atmospheric Composition And Structure: Aerosols And Particles, Atmospheric Composition And Structure: Pollution-Urban And Regional, Oceanography: Biological And Chemical: Aerosols, Planetology: Comets And Small Bodies: Atmospheres-Evolution

Scientific paper

The yearly and monthly mean aerosol optical depth (AOD) at 0.75 μm were retrieved using a new method improved from Qiu's algorithm from the data of daily direct solar radiation, sunshine duration, surface pressure, and vapor pressure at 46 A class solar radiation stations over China from 1961 to 1990, as well as the Total Ozone Mapping Spectrometer (TOMS) derived ozone data from 1979 to 1990. Then the analysis on the distribution of yearly mean AOD and its variation over China in the last 30 years were made from the derived AOD data. It was found that the yearly mean AOD has pattern related to the geographical features with the maximums over basins. One of the maximum centers at Sichuan Basin, southwest of China, and the other is in the south Xinjiang Basin, northwest of China. In most areas of China the maximum of AOD occurs in spring, but the season of reaching the minimum varies with regions. The monthly mean AOD distributions are similar to the annual mean pattern, having strong ``basin'' effect, but the month-to-month differences are still obvious. In addition, AOD increased dramatically over China mainland from 1961 to 1990, particularly in the middle and lower reaches area of the Yangzi River and the east part of southwest China. In north China, Shandong peninsula, the east part of Qinghai Province, and coastal areas of Guangdong Province, a significant increasing trend of AOD is shown, while in most parts of northwest China and northwest China, the increase trend is less significant. However, in the western part of Xinjiang autonomous region and part of Yunnan Province, only a decreasing tendency is shown. Of the total 46 stations, the yearly averaged AOD variation curve can be briefly divided into two periods. One period is from 1961 to 1975, when AOD is smaller than the 30 year mean value; the other period is from 1976 to 1990, when AOD is higher than the mean value. Except for the peak in 1982 and 1983, which may be attributed to the eruptions of El Chichon, the curve shows a significant increasing trend from 1961 to 1990. The monthly averaged AODs of the total 46 stations also obviously increased.

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