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地表臭氧作为近地层最主要的大气污染物之一,其不断上升的浓度及其对粮食作物的影响受到越来越多的关注.本研究利用微气象学观测方法,探明自然条件下冬麦田的臭氧沉降过程,分析了影响臭氧沉降过程的环境因子.结果表明:观测期内(小麦生长旺期)臭氧通量均值为-0.35μg·m~(-2)·s~(-1)(负号表示沉降方向指向地面),臭氧沉降平均速率为0.55cm·s~(-1),空气动力学阻力均值为30 s·m~(-1),粘性副层阻力均值为257 s·m~(-1),冠层阻力均值为163 s·m~(-1),且均存在明显的日变化趋势.臭氧沉降阻力大小受摩擦速度、太阳辐射强度、温度和相对湿度等因素的影响.
As one of the most important atmospheric pollutants in the near-surface layer, surface ozone is receiving more and more attention due to its increasing concentration and its impact on food crops.In this study, using micrometeorology observation method to determine the natural winter wheat fields , And the environmental factors affecting the process of ozone subsidence were analyzed.The results showed that the average ozone flux in the growing season was -0.35μg · m -2 · s -1 The negative sign indicates that the direction of sedimentation points to the ground), the average rate of ozone subsidence is 0.55cm · s -1, the mean value of aerodynamic drag is 30 s · m -1, and the mean value of viscous sublayer resistance is 257 s · m ~ (-1), the mean value of canopy resistance was 163 s · m ~ (-1), and there was a clear diurnal variation tendency.The resistance of ozone settling was influenced by factors such as friction velocity, solar radiation intensity, temperature and relative humidity .