南京秋季裸地臭氧干沉降通量观测及土壤阻力模拟  

O_3 dry deposition flux observation and soil resistance modeling over a bare soil in Nanjing area in autumn

作　　者：黄积庆 郑有飞[1,2] 徐静馨[1,2] 赵辉[3] 袁月[3] 褚仲芳 HUANG Ji-qing ZHENG You-fei XU Jing-xin ZHAO Hui YUAN Yue CHU Zhong-fang(School of Atmospheric Physics, Nanjing University of Information ＆ Technology, Nanjing 210044, China Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing 210044, China School of Environmental Science and Engi- neering, Nanjing University of Information ＆ Technology, Nanjing 210044, China）.)

机构地区：[1]南京信息工程大学大气物理学院,南京210044 [2]中国气象局气溶胶与云降水重点实验室,南京210044 [3]南京信息工程大学环境科学与工程学院,南京210044

出　　处：《应用生态学报》2016年第10期3196-3204,共9页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(41475108)资助~~

摘　　要：利用涡度相关系统配合快速臭氧浓度脉动仪在南京地区裸地上观测臭氧浓度及沉降通量,分析臭氧浓度、沉降通量与气象条件的相关性,揭示沉降通量和速率的变化特征,利用模拟的土壤阻力计算臭氧沉降通量和速率并与观测结果进行对比.结果表明:2015年9月25日至10月28日,臭氧浓度日变化呈单峰型分布,并且因辐射的增强而升高.秋季裸地臭氧沉积通量主要受臭氧浓度影响,平均日变化-31.4^-156.8 ng·s^(-1)·m^(-2)(负号表示方向向下).因裸地无植被的缓冲作用,臭氧沉降通量受环境因素影响更为明显.臭氧沉降速率为0.09~0.30 cm·s^(-1).臭氧在大气传输中湍流交换起主要作用,裸地臭氧干沉降的下垫面条件尤为重要,土壤阻力(Rs)随相对湿度(RH)的增加呈指数上升,其关系模型为Rs=89.981e0.0246 RH,模拟的臭氧通量和沉积速率与观测的通量和速率的一致性较好.In this study,the concentration of O3 and its deposition flux over a bare soil in Nanjing in autumn were observed by using an eddy covariance system with rapid ozone analyzer.We analyzed the correlation of ozone concentration,deposition flux,and meteorological conditions in order to explore the characteristics of the variations in ozone deposition flux and deposition velocity.We also compared flux and velocity by using modeled soil resistance with observations.The results showed that the diurnal variation of ozone concentration exhibited a single peak distribution,and it increased due to radiation enhancement from September 25 th to October 28 th,2015.Ozone deposition flux over a bare soil in autumn was mainly affected by its concentration,with diurnal average values varying from-31.4 to-156.8 ng·s-1·m-2（the negative sign indicated that the deposition direction was toward the ground）.As a result of non-vegetation over a bare soil,the ozone deposition flux was significantly influenced by environmental factors.Diurnal average of deposition velocities varied in the range of 0.09-0.30 cm·s-1.The turbulence exchange played a major role in the atmosphere transportation of ozone,and underlying surface condition was particularly important to O3 dry deposition over the bare soil.Soil resistance（Rs） increased exponentially with air relative humidity（RH）,and the equation was Rs= 89.981e0.0246 RH.The parameterized ozone deposition velocities and fluxes were in good agreement with the measured values.

关 键 词：臭氧干沉降通量 涡度法 裸地 土壤阻力 

分 类 号：S152[农业科学—土壤学] X51[农业科学—农业基础科学]