A Case Study of the Impacts of Dust Aerosols on Surface Atmospheric Variables and Energy Budgets in a Semi-Arid Region of China
The authors present a case study investigating the impacts of dust aerosols on surface atmospheric variables and energy budgets in a semi-arid region of China. Enhanced observational meteorological data, radiative fluxes, near-surface heat fluxes, and concentrations of dust aerosols were collected from Tongyu station, one of the reference sites of the International Coordinated Energy and Water Cycle Observations Project (CEOP), during a typical dust storm event in June 2006. A comprehensive analysis of these data show that in this semi-arid area, higher wind velocities and a continuously reduced air pressure were identified during the dust storm period. Dust storm events are usually associated with low relative humidity weather conditions, which result in low latent heat flux values. Dust aerosols suspended in the air decrease the net radiation, mainly by reducing the direct solar radiation reaching the land surface. This reduction in net radiation results in a decrease in soil temperatures at a depth of 2 cm. The combination of increased air temperature and decreased soil temperature strengthens the energy exchange of the atmosphere-earth system, increasing the surface sensible heat flux. After the dust storm event, the atmosphere was dominated by higher pressures and was relatively wet and cold. Net radiation and latent heat flux show an evident increase, while the surface sensible heat flux shows a clear decrease.
Case Study Dust Aerosol Energy Budget Semi-Arid Region
Xiaolu Lin Weidong Guo Lei Zhang Renjian Zhang
Key Laboratory for Semi-Arid Climate Change of the Ministry of Education,College of Atmospheric Scie Insititute for Climate and Global Change Research,School of Atmospheric Sciences,Nanjing University, Key Laboratory for Semi-Arid Climate Change of the Ministry of Education,College of Atmospheric Scie Key Laboratory of Regional Climate-Environment for East Asia,,Institute of Atmospheric Physics,Chine
国际会议
西安
英文
737-742
2011-08-17（万方平台首次上网日期，不代表论文的发表时间）