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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.
The correlation between ozone concentration, sedimentation flux and meteorological conditions was analyzed by using the eddy covariance correlation system and rapid ozone concentration pulsation instrument to observe the ozone concentration and sedimentation fluxes in bare land in Nanjing area. The variation characteristics of sedimentation flux and velocity were revealed. Soil respiration was calculated and compared with the observed data.The results showed that the diurnal variation of ozone concentration presented a unimodal distribution from September 25 to October 28, 2015, and increased with the increase of radiation The flux of ozone deposition in autumn bare land was mainly affected by the ozone concentration, with an average daily change of -31.4 ~ -156.8 ng · s -1 · m -2 (the negative sign indicates the downward direction) The buffer effect of the vegetation and the ozone subsidence flux are more affected by the environmental factors.The ozone deposition rate is 0.09-0.30 cm · s -1 .The turbulent exchange of ozone plays an important role in the atmospheric transport and the dry deposition of ozone in the bare land The underlying surface conditions are particularly important. The soil resistance (Rs) increases exponentially with the increase of relative humidity (RH). The relationship model is Rs = 89.981e0.0246 RH. The simulated ozone flux and sedimentation rate are similar to the observed flux and The consistency of the rate is better.