大气科学2016，Vol.40Issue(4)：777-791,15.DOI:10.3878/j.issn.1006-9895.1509.15197
青藏高原东南部复杂地形区不同天气状况下陆气能量交换特征分析
Characteristics of Land-Atmosphere Energy Exchanges over Complex Terrain Area of Southeastern Tibetan Plateau under Different Synoptic Conditions
摘要
Abstract
AbstractThe geographical environment of the Tibetan Plateau is complex. Previous studies of land surface–boundary layer processes mainly focused on different underlying surfaces without complex topography. The characteristics of land–atmosphere exchanges of energy on different underlying surfaces over complex terrain area of the Tibetan Plateau under different synoptic conditions are analyzed in the present study based on observations collected at four ground sites <br> during May 20th to July 9th 2013 over Linzhi. Results indicate that in the case when the downward shortwave radiation is roughly the same at all the sites, sensible heat flux at the northern slope site, which is covered by broad-leaved forest and characterized by steep terrain, is greater than that at the other three sites; latent heat flux at the southern site, which is covered by wheat and thus with large vegetation fraction, is the largest among the four sites. Energy fluxes show obvious diurnal variation at each individual site. In sunny days, sensible heat flux and net radiation are significantly greater than that in rainy days. However, latent heat flux has little changes under different weather conditions. The influence of complex terrain of the Tibetan Plateau on sensible heat flux is more significant than that of different synoptic conditions. Different topographies have significant impacts on latent heat flux on rainy days. When the warm moist southwesterly flow in front of the South Asia monsoon trough affects Linzhi, the weather will be dominated by cloudy and rainy days. Otherwise sunny days are prevalent in this region. Apparently the variation of monthly land–atmosphere fluxes over Linzhi area is modulated by the South Asia monsoon activities.关键词
青藏高原/复杂地形区/不同天气状况/陆-气能量交换/下垫面Key words
Tibetan Plateau/Complex terrain area/Different synoptic conditions/Land-atmosphere energy exchanges/Underlying surface分类
大气科学引用本文复制引用
李娟,李跃清,蒋兴文,高笃鸣..青藏高原东南部复杂地形区不同天气状况下陆气能量交换特征分析[J].大气科学,2016,40(4):777-791,15.基金项目
国家自然科学基金项目91337215、91337107，公益性行业（气象）科研专项GYHY201406001、GYHY201206041、GYHY201006053，四川省气象局高原气象观测与应用创新团队@@@@Funded byNational Natural Science Foundation of China (Grants 91337215,91337107), Special Scientific Research Foundation of Meteorological Public Welfare Profession of China (Grants GYHY201406001, GYHY201206041, GYHY201006053), the Plateau Meteorological Observation and Application Innovation Team of Sichuan Meteorological Bureau （Grants 91337215,91337107）
