Low-Level Temperature Inversions and Their Effect on Aerosol Condensation Nuclei Concentrations under Different Large-Scale Synoptic Circulations

• Published in: Advances in atmospheric sciences Vol. 32; no. 7; pp. 898 - 908
• Main Authors: Li, Jun, Chen, Hongbin, Li, Zhanqing, Wang, Pucai, Cribb, Maureen, Fan, Xuehua
• Format: Journal Article
• Language: English
• Published: Heidelberg Science Press 01.07.2015; Springer Nature B.V; Key Laboratory of Middle Atmosphere and Global Environment Observation,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029; College of Global Change and Earth System Science,Beijing Normal University,Beijing 100875%Key Laboratory of Middle Atmosphere and Global Environment Observation,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029%The Earth System Science Interdisciplinary Center,University of Maryland,College Park,MD 20740,USA; Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Nanjing University of Information Science & Technology,Nanjing 210044%The Earth System Science Interdisciplinary Center,University of Maryland,College Park,MD 20740,USA
• Subjects: Aerosols; Atmosphere; Atmospheric aerosols; Atmospheric Sciences; Boundary layers; Earth and Environmental Science; Earth Sciences; Geophysics/Geodesy; Low temperature; Meteorology; Pollutants; Temperature; Temperature gradients; Temperature inversions; Vertical distribution; 低层; 凝结核; 大尺度; 天气模式; 天气环流; 气溶胶浓度; 统计特性; 逆转; condensation nuclei; statistical characteristics; large-scale synoptic pattern; temperature inversion; aerosol
• ISSN: 0256-1530; 1861-9533
• DOI: 10.1007/s00376-014-4150-z

Knowledge of the statistical characteristics of inversions and their effects on aerosols under different large-scale synoptic circulations is important for studying and modeling the diffusion of pollutants in the boundary layer. Based on results gen- erated using the self-organizing map （SOM） weather classification method, this study compares the statistical characteristics of surface-based inversions （SBIs） and elevated inversions （EIs）, and quantitatively evaluates the effect of SBIs on aerosol condensation nuclei （CN） concentrations and the relationship between temperature gradients and aerosols for six prevailing synoptic patterns over the the Southern Great Plains （SGP） site during 2001-10. Large-scale synoptic patterns strongly influ- ence the statistical characteristics of inversions and the accumulation of aerosols in the low-level atmosphere. The activity, frequency, intensity, and vertical distribution of inversions are significantly different among these synoptic patterns. The verti- cal distribution of inversions varies diurnally and is significantly different among the different synoptic patterns. Anticyclonic patterns affect the accumulation of aerosols near the ground more strongly than cyclonic patterns. Mean aerosol CN con- centrations increase during SBIs compared to no inversion cases by 16.1%, 22.6%, 24.5%, 58.7%, 29.8% and 23.7% for the six synoptic patterns. This study confirms that there is a positive correlation between temperature gradients and aerosol CN concentrations near the ground at night under similar large-scale synoptic patterns. The relationship is different for different synoptic patterns and can be described by linear functions. These findings suggest that large-scale synoptic patterns change the static stability of the atmosphere and inversions in the lower atmosphere, thereby influencing the diffusion of aerosols near the ground.