结合2类大气成分观测仪器的技术特点,对OPSIS AB DOAS系统和ThermoSCIENTIFIC EMS系统分别监测的南京郊区2009年冬季和2010年春季O3、NO2、SO2质量浓度数据进行了质量控制和分析对比,简要分析了这3种气体浓度的季节变化特征.对2009年秋...结合2类大气成分观测仪器的技术特点,对OPSIS AB DOAS系统和ThermoSCIENTIFIC EMS系统分别监测的南京郊区2009年冬季和2010年春季O3、NO2、SO2质量浓度数据进行了质量控制和分析对比,简要分析了这3种气体浓度的季节变化特征.对2009年秋季分别采用2种仪器观测的南京城区和郊区的污染情况进行了对比,分析了城郊差异.结果表明:2套系统对相同气体的测量结果相关性较好,DOAS系统的测量值受大气中水汽和气溶胶影响较大,普遍高于EMS系统,绝对值相差范围在14%～25%之间;南京郊区冬季大气中SO2和NO2质量浓度较高,O3质量浓度较低,春季反之;NO2质量浓度曲线与O3呈负相关;秋季城区NO2质量浓度较高,日变化呈双峰型,郊区呈单峰型;城郊O3日变化均呈单峰型,城区日变化幅度较大;SO2日变化在城区呈单峰型,在郊区呈双峰型.展开更多
NO_3 radicals accumulate during the night, thereby being the most critical night oxidant. Owing to the low concentration and dramatic variation, the detection of atmospheric NO_3 radicals is still challenging. In this...NO_3 radicals accumulate during the night, thereby being the most critical night oxidant. Owing to the low concentration and dramatic variation, the detection of atmospheric NO_3 radicals is still challenging. In this paper, an LED-based Long Path Differential Optical Absorption Spectroscopy（LPDOAS） instrument is developed for measuring the atmospheric NO_3 radicals. This instrument is composed of a Schmidt-Cassegrain telescope, a combined emitting and receiving fiber,and a red LED equipped with a thermostat, and has a center wavelength of 660 nm, covering the NO_3 strongest absorption peak（662 nm）. The influence of LED temperature fluctuations is discussed. The temperature of the LED lamp with a home-made thermostat is tested, showing a stability of ±0.1℃. The principle and fitting analyses of LED-LPDOAS are presented. A retrieval example and a time series of NO_3 radical concentrations with good continuity for one night are shown. The detection limit of NO_3 for 2.6-km optical path is about 10 ppt.展开更多
The radiant cooling system generally operates with the dedicated outdoor air system （DOAS）. Air supply modes and the corresponding setting parameters of the hybrid system may substantially influence the indoor therm...The radiant cooling system generally operates with the dedicated outdoor air system （DOAS）. Air supply modes and the corresponding setting parameters of the hybrid system may substantially influence the indoor thermal comfort. With target indexes of air diffusion performance index （ADPI） and predicted mean vote （PMV）, the Taguchi method was used to choose the optimal air supply mode and to analyze the significance of different factors on the thermal comfort. The results are expected for conducting the future design and regulation of the hybrid system. Computation fluid dynamics （CFD） simulation as well as verified experiments was performed during the research. Based on the ADPI studies, it is found that the air supply mode of ceiling delivery with ceiling exhaust is an optimized option to apply in DOAS of the hybrid system. Variance analysis results show that influence fact of air supply temperature is the most dominant one to impact the indoor thermal comfort index of PMV.展开更多
文摘结合2类大气成分观测仪器的技术特点,对OPSIS AB DOAS系统和ThermoSCIENTIFIC EMS系统分别监测的南京郊区2009年冬季和2010年春季O3、NO2、SO2质量浓度数据进行了质量控制和分析对比,简要分析了这3种气体浓度的季节变化特征.对2009年秋季分别采用2种仪器观测的南京城区和郊区的污染情况进行了对比,分析了城郊差异.结果表明:2套系统对相同气体的测量结果相关性较好,DOAS系统的测量值受大气中水汽和气溶胶影响较大,普遍高于EMS系统,绝对值相差范围在14%～25%之间;南京郊区冬季大气中SO2和NO2质量浓度较高,O3质量浓度较低,春季反之;NO2质量浓度曲线与O3呈负相关;秋季城区NO2质量浓度较高,日变化呈双峰型,郊区呈单峰型;城郊O3日变化均呈单峰型,城区日变化幅度较大;SO2日变化在城区呈单峰型,在郊区呈双峰型.
基金Project supported by the"Strategic Priority Research Program"of the Chinese Academy of Sciences(Grant Nos.XDB05040200 and XDB05010500)
文摘NO_3 radicals accumulate during the night, thereby being the most critical night oxidant. Owing to the low concentration and dramatic variation, the detection of atmospheric NO_3 radicals is still challenging. In this paper, an LED-based Long Path Differential Optical Absorption Spectroscopy（LPDOAS） instrument is developed for measuring the atmospheric NO_3 radicals. This instrument is composed of a Schmidt-Cassegrain telescope, a combined emitting and receiving fiber,and a red LED equipped with a thermostat, and has a center wavelength of 660 nm, covering the NO_3 strongest absorption peak（662 nm）. The influence of LED temperature fluctuations is discussed. The temperature of the LED lamp with a home-made thermostat is tested, showing a stability of ±0.1℃. The principle and fitting analyses of LED-LPDOAS are presented. A retrieval example and a time series of NO_3 radical concentrations with good continuity for one night are shown. The detection limit of NO_3 for 2.6-km optical path is about 10 ppt.
文摘The radiant cooling system generally operates with the dedicated outdoor air system （DOAS）. Air supply modes and the corresponding setting parameters of the hybrid system may substantially influence the indoor thermal comfort. With target indexes of air diffusion performance index （ADPI） and predicted mean vote （PMV）, the Taguchi method was used to choose the optimal air supply mode and to analyze the significance of different factors on the thermal comfort. The results are expected for conducting the future design and regulation of the hybrid system. Computation fluid dynamics （CFD） simulation as well as verified experiments was performed during the research. Based on the ADPI studies, it is found that the air supply mode of ceiling delivery with ceiling exhaust is an optimized option to apply in DOAS of the hybrid system. Variance analysis results show that influence fact of air supply temperature is the most dominant one to impact the indoor thermal comfort index of PMV.
