Weiliang Li

Publications (6)7.41 Total impact

• Article: Impacts of thermodynamic processes over the Tibetan Plateau on the Northern Hemispheric climate

  XiuJi Zhou, Ping Zhao, JunMing Chen, LongXun Chen, WeiLiang Li
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  ABSTRACT: We here report our recent research results on the climatic features of Tibetan thermodynamic functions and their impacts on the regional climates of the Northern Hemisphere. The results show that the thermodynamic processes over the Tibetan Plateau not only strongly influence the Asian monsoon and precipitation, but also modulate the atmospheric circulation and climate over North America and Europe through stimulating the large-scale teleconnections such as the Asian-Pacific oscillation and affect the atmospheric circulation over the southern Indian Ocean. The Tibetan climate may be affected by sea surface temperatures over the tropical Pacific. On the other hand, the Tibetan climate also affects the atmosphere-ocean interactions in the tropics and mid-latitudes of the Pacific by the atmospheric circulation over the North Pacific. In spring and summer, the thermodynamic anomalies on the plateau affect the subtropical high pressure, the Hadley circulation, and the intertropical convergence zone over the Pacific, and then modulate the development of the El Niño/Southern Oscillation (ENSO). It is necessary to study the forecasting methods for the development of ENSO from the Tibetan climate anomaly. This result also embodies the essence of interactions among land, atmosphere, and ocean over the Northern Hemisphere. Since the previous studies focused on impacts of the plateau on climates in the Asian monsoon regions, it is essential to pay more attention to studying the roles of the plateau in the Northern Hemispheric and even global climates.
  Science in China Series D Earth Sciences 04/2012; 52(11):1679-1693. · 1.59 Impact Factor
• Article: Prediction of the trend of total column ozone over the Tibetan Plateau

  Yu Liu, Weiliang Li, Xiuji Zhou
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  ABSTRACT: By using 2-D chemical model, the trend of total column ozone over the Tibetan Plateau is simulated. The results show that from 1980 to 1993, the total column ozone over the Tibetan Plateau decreases; after 1995, it starts to recover. But until 2050, it will not still reach the level of 1980 total column ozone. Under Tibetan special circulation, its total column ozone recovers more rapidly than zonal mean. Therefore, the Tibetan special meridional circulation is not a main reason why the total column ozone over the Tibetan Plateau decreases more strongly than zonal mean.
  Science in China Series D Earth Sciences 04/2012; 44:385-389. · 1.59 Impact Factor
• Article: Mass exchange between stratosphere and trotosphere over the Tibetan Plateau and its surroundings

  Chunhua Cong, Weiliang Li, Xiuji Zhou
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  ABSTRACT: Using NCEP dataset we calculate the exchange of mass across the thermal tropopause by the Wei’s method from 1978 to 1997 over the Tibetan Plateau and its surroundings. We also calculate the annual variation of aerosol and ozone of 100 hPa level with the monthly SAGE dataset from July 1988 to December 1993. Results indicate that (i) the mass from troposphere to stratosphere is magistral station in summer over the Tibetan Plateau and its surroundings. The air transport reaches the summit in midsummer with two large value centers, which lie in the north of Bengal Bay and southeastern Tibetan Plateau, respectively. A large value center, which lies over the Tibetan Plateau, is smaller than that aforementioned. In winter, the mass transport is from stratosphere to troposphere, and reaches the minimum in January. (ii) As far as the 19-year mean cross-tropopause mass exchange from June to September is concerned, the net mass transport is 14.84×1018 kg from troposphere to stratosphere. So the area from the Tibetan Plateau to the Bengal Bay is a channel through which the mass of lower atmosphere layer gets into upper troposphere and lower stratosphere. (iii) The cross-tropopause mass may take the lower level aerosol to the tropopause. Then, the concentration of aerosol near the tropopause becomes larger, which may cause the content of ozone to reduce.
  Chinese Science Bulletin 04/2012; 47(6):508-512. · 1.32 Impact Factor
• Article: Characteristics of atmospheric aerosol optical depth variation over China in recent 30 years

  Yunfeng Luo, Daren Lü, Qing He, Weiliang Li, Xiuji Zhou
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  ABSTRACT: This note retrieves the annual and monthly mean 0.75 μm aerosol optical depth (AOD) by using the daily direct solar radiation and sunshine duration data of 47 solar stations from 1961 to 1990. The characteristic of AOD variation over China in recent 30 years was analyzed. The results indicate that AOD increased obviously over China from 1961 to 1990. AOD increased most rapidly over the east part of Southwest China, the middle-and-lower reaches of the Yangtze River and the Tibetan Plateau. The increasing trend of AOD is also relatively distinct in North China, the Shandong Peninsula, east part of Qinghai Province, and coastal areas of Guangdong Province. However, in most parts of Northwest China and Northeast China, the increase of AOD is less significant, while in the west part of the Xinjiang Uygur Autonomous Region and some parts of Yunnan Province, AOD shows decreasing tendency. Generally, AOD reaches its maximum in spring and the minimum appears in summer. As to the linear trend, the maximum occurs in spring but the minimum in winter. Among the 47 stations selected in this note, the largest three stations of AOD are Chengdu, Chongqing and Nanchong, respectively, which all lie in the Sichuan Basin, and the smallest value of AOD occurs in Jinghong located in Yunnan Province. KeywordsChina-atmospheric aerosol-optical depth-yearly variation
  Chinese Science Bulletin 04/2012; 45(14):1328-1334. · 1.32 Impact Factor
• Article: Analysis of the influence of Taihu Lake and the urban heat islands on the local circulation in the Yangtze Delta

  Weiliang Li, Hongli Liu, Xiuji Zhou, Yu Qin
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  ABSTRACT: A fine-mesh regional meteorological model that suits the Yangtze Delta region was developed. This model was used to simulate some micro weathers, such as the land and sea breezes, land and lake breezes and urban heat island effect, in the Yangtze Delta successfully. The model was also used to study the characteristics and the formation mechanism of surface shear line in the region. It is indicated that the interaction between the sea breeze and the lake breeze is the main factor for the formation and maintenance of the surface shear line.
  Science in China Series D Earth Sciences 03/2003; 46(4):405-415. · 1.59 Impact Factor
• Article: Improvements of the RADM1 gas‐phase chemical mechanism

  Jianzhong Ma, Weiliang Li, Xiuji Zhou
  Journal of Environmental Science & Health Part A. 11/2000; A35(10):1931-1939.