Characteristics of climate change in the “significant impact zone” affected by aerosols over eastern China in warm seasons |
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| Authors: | XiaoHui Shi XiangDe Xu LiAn Xie |
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| Institution: | (1) State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing, 100081, China;(2) Department of Marine, Earth and Atmospheric Sciences, North Carolina State University, Raleigh, NC 27695-8208, USA |
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| Abstract: | Through analysis of the distribution pattern and changing characteristics of atmospheric aerosols over the East Asia region
during warm seasons in recent 20 a and beyond as well as their possible interactive relationship with a variety of meteorological
elements, it is found that the high-value zone of aerosol optical depth derived from the Total Ozone Mapping Spectrometer
(TOMS), its significant negative correlation zones in terms of sunshine duration (SD) and surface air temperature (SAT) and
its significant positive correlation zones with low-level cloud amount (LCC) are co-located in the South China region during
warm periods. Based on this finding, the region is referred to as a “significant impact zone” (SI zone) affected by aerosols.
Then, a comparative analysis is made on variation differences of observed SAT, SD and LCC, etc. in different regions. It is
also found that the LCC is increased and the SD is decreased within the “SI zone” over eastern China during the warm season.
These characteristics are more evident than those beyond the zone, while the warming trend within the zone is evidently weaker
than that outside it. Studies show that since recent 20 a, under the influence of aerosols, the LCC tend to increase substantially
with a clear decrease of SD and an unnoticeable warming trend within the “SI zone”. Comparing with the climate change beyond
the zone, the difference is significant. Therefore, the effects of atmospheric aerosols on climate is possibly one of the
contributions to the difference of climate change existed between the southern and northern parts of the Eastern China during
a warm season.
Supported by the International Sci-Tech Cooperative Project under the auspices of the Ministry of Science and Technology of
the People’s Republic of China (No. 2004DFA06100) |
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| Keywords: | warm season significant impact zone of aerosols climate change |
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