Features of aerosol optical depth and its relation to extreme temperatures in China during 1980–2001 |
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| Authors: | Ting Hu Zhaobo Sun Zhaoxin Li |
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| Institution: | 1. Jiangsu Key Laboratory of Meteorological Disaster,Nanjing University of Information Science and Technology,Nanjing 210044,China;The Department of Atmospheric Science,Nanjing University of Information Science and Technology,Nanjing 210044,China
2. Laboratoire de Meteorologie Dynamique,CNRS,France |
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| Abstract: | Based on Total Ozone Mapping Spectrometer (TOMS) monthly aerosol optical thickness (AOT) measurements in 1980–2001 a study
is made of space/time patterns and difference between land and sea of AOT 0.50 μm thick over China, which are put into correlation
analysis with synchronous extreme temperature indices (warm/cold day and night). Results suggest that 1) the long-term mean
AOT over China is characterized by typical geography, with pronounced land-sea contrast. And AOT has significant seasonality
and its seasonal difference is diminished as a function of latitude. 2) On the whole, the AOT displays an appreciably increasing
trend, with the distinct increase in the eastern Qinghai-Tibetan plateau and SW China, North China, the mid-lower Changjiang
(MiLY) valley as well as the South China Sea, but marginal decrease over western/northern Xinjiang and part of South China.
3) The AOT over land and sea is marked by conspicuous intra-seasonal and -yearly oscillations, with remarkable periods at
one-, two-yr and more (as interannual periods). 4) Land AOT change is well correlated with extremely temperature indexes.
Generally, the correlations of AOT to the extreme temperature indices are more significant in Eastern China with 110°E as
the division. Their high-correlation regions are along the Southern China coastline, the Loess Plateau and the Sichuan Basin,
and even higher in North China Plain and the mid-lower Changjiang River reaches. 5) Simulations of LMDZ-regional model indicate
that aerosol effects may result in cooling all over China, particularly in Eastern China. The contribution of aerosol change
may result in more decrease in the maximum temperature than the minimum, with decrease of 0.11/0.08 K for zonal average, respectively. |
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| Keywords: | aerosol optical thickness extreme temperature index space/time pattern trend correlation |
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