摘要
分析了合肥市区能见度与PM_(10)、湿度之间的关系.使用积分浊度仪与PM_(10)传感器比较,验证PM_(10)传感器数据准确性.两台相同型号的PM_(10)传感器同步测量,相对误差小于5%,保证测量数据稳定可靠.依据米散射理论推导出能见度是不同尺度颗粒物质量浓度乘以常数之和的反比函数,但是由于测量难度,实验时无法使用这个函数.因此通过数值模拟和数据拟合,确定了能见度是PM_(10)质量浓度的幂函数.根据湿度修正表达式对高湿度时拟合结果进行修正,并使用实验数据对修正结果进行验证.大气湿度小于60%RH时,使用PM_(10)质量浓度拟合得到能见度值与实测值变化趋势一致,相对误差范围为-5%~8%.当大气湿度值高于60%RH时,拟合能见度值与实测值相对误差超过50%,且高于实测值,湿度越大拟合值偏差越大.使用湿度修正公式对拟合值修正,修正值与实测值的相对误差绝对值小于10%.利用不同时间的测量数据对拟合公式验证,也获得了一致的结果,证明湿度修正公式对PM_(10)质量浓度拟合能见度校正的可行性.最后大雾时运用三者的拟合与修正关系,湿度大于99%时,湿度修正也难以实现对拟合值的改善.
The relationship between atmospheric visibility,PM_(10)and humidity in Hefei was analyzed.The integrating nephelometer was employed to verify the accuracy of PM_(10)sensor by comparative measurement.Two PM_(10)sensors with the same model were also used to test the stability and reliability of the measurement,and the relative error of the two PM_(10)sensors was less than 5%.According to the theory of Mie scattering,visibility was an inverse function of the mass concentration of particles at different scales multiplied by the sum of constants.However,it was hard to acquire the detailed function in the specific experiment.Therefore,by numerical simulation and data fitting,visibility was the power function of PM_(10)mass concentration.According to the correction expression,the fitting result at high humidity was modified,and the experimental data was used to verify the modified result.When the atmospheric humidity was less than 60%RH,visibility fitted by PM_(10)was consistent with the measured value,and the relative error range was-5%~8%.When the atmospheric humidity was higher than 60%RH,the relative error between the fitted result and visibility was more than 50%,and the fitted value was always higher than visibility.The higher the humidity was,the greater the deviation of the fitted value was.Humidity correction formula was used to correct the fitting result,and the absolute value of error between the modified value and the measured value was less than 10%.The humidity correction results were verified by measurements at other times.Unfortunately,if there was fog,it was difficult to correct the fitting results when the humidity was greater than 99%.
作者
张世国
汪玮
胡顺星
方海涛
苑克娥
王敏
王毛翠
ZHANG Shiguo;WANG Wei;HU Shunxing;FANG Haitao;YUAN Ke'e;WANG Min;WANG Maocui(Key Laboratory of Atmospheric Optics,Anhui Institute of Optics and Fine Mechanics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031;Advanced Laser Technology Laboratory of Anhui Province,Hefei 230037;Science Island Branch of Graduate School,University of Science and Technology of China,Hefei 230026;Anhui Meteorological Observation Technical Center,Hefei 230031)
出处
《环境科学学报》
CAS
CSCD
北大核心
2023年第5期333-340,共8页
Acta Scientiae Circumstantiae
基金
先进激光技术安徽省实验室开放研究基金(No.AHL2021ZR01)
中国气象局创新发展专项(No.CXFZ2022J064)。
