The aerosols has been collected by sample of high-volume sampler in Beijing,and the concentrations of n-alkane in aerosol samples were determined via GC-MS.The n-alkane homolog was from C10 to C33.The total concentrat...The aerosols has been collected by sample of high-volume sampler in Beijing,and the concentrations of n-alkane in aerosol samples were determined via GC-MS.The n-alkane homolog was from C10 to C33.The total concentrations of n-alkanes in aerosol of Beijing varied from 176.22 to 5 410.2 ng/m3 in PM10 and from 77.89 to 3 138.9 ng/m3 in PM2.5,respectively,during the year and were higher in winter time than those in the other three season.The carbon numbers of main peaks of n-alkanes were 25,27,29 in spring,and 27,29,31 in summer,27,29 in autumn,25 in winter for PM10 samples,respectively.CPI in four seasons was close to 1.0,which indicated that n-alkanes were mainly from combustion of fossil fuel like petroleum,partially from advanced plants.展开更多
建立起中尺度天气模式WRF(weather research and forecasting)和计算流体力学模式Fluent的耦合系统,将WRF输出当做边界条件驱动Fluent,用于风场信息的精确模拟。利用该系统对下垫面条件复杂的鄱阳湖区域风场进行模拟分析,并将模拟数据...建立起中尺度天气模式WRF(weather research and forecasting)和计算流体力学模式Fluent的耦合系统,将WRF输出当做边界条件驱动Fluent,用于风场信息的精确模拟。利用该系统对下垫面条件复杂的鄱阳湖区域风场进行模拟分析,并将模拟数据与两个测风数据集进行定量比较,结果表明WRF耦合Fluent系统模拟的近地风场信息比WRF直接模拟结果有明显改善,证实中尺度天气模式耦合计算流体力学模式的技术思路有很好的可行性。这个耦合系统实现了从天气尺度到风力机尺度大气运动的模拟,能相对准确地给出风电场区域小尺度地形变化引起的风场细节。展开更多
This paper set up the identification method of BF3/ methanol derivatization,GC-MS for analyzing organic acid in PM2.5 aerosol. The result shows that this method is reliable for monitoring the polar organic acid. Total...This paper set up the identification method of BF3/ methanol derivatization,GC-MS for analyzing organic acid in PM2.5 aerosol. The result shows that this method is reliable for monitoring the polar organic acid. Total 34 polar organic acids were identified and quantified, including 23 n-fatty acids and 6 dicarboxylic acids, 5 aromatic acids.The total concentration of n-fatty acids was 62-664 ng·m-3, and the C16 acid was the most abundant acid,followed by C18.展开更多
文摘The aerosols has been collected by sample of high-volume sampler in Beijing,and the concentrations of n-alkane in aerosol samples were determined via GC-MS.The n-alkane homolog was from C10 to C33.The total concentrations of n-alkanes in aerosol of Beijing varied from 176.22 to 5 410.2 ng/m3 in PM10 and from 77.89 to 3 138.9 ng/m3 in PM2.5,respectively,during the year and were higher in winter time than those in the other three season.The carbon numbers of main peaks of n-alkanes were 25,27,29 in spring,and 27,29,31 in summer,27,29 in autumn,25 in winter for PM10 samples,respectively.CPI in four seasons was close to 1.0,which indicated that n-alkanes were mainly from combustion of fossil fuel like petroleum,partially from advanced plants.
文摘建立起中尺度天气模式WRF(weather research and forecasting)和计算流体力学模式Fluent的耦合系统,将WRF输出当做边界条件驱动Fluent,用于风场信息的精确模拟。利用该系统对下垫面条件复杂的鄱阳湖区域风场进行模拟分析,并将模拟数据与两个测风数据集进行定量比较,结果表明WRF耦合Fluent系统模拟的近地风场信息比WRF直接模拟结果有明显改善,证实中尺度天气模式耦合计算流体力学模式的技术思路有很好的可行性。这个耦合系统实现了从天气尺度到风力机尺度大气运动的模拟,能相对准确地给出风电场区域小尺度地形变化引起的风场细节。
文摘This paper set up the identification method of BF3/ methanol derivatization,GC-MS for analyzing organic acid in PM2.5 aerosol. The result shows that this method is reliable for monitoring the polar organic acid. Total 34 polar organic acids were identified and quantified, including 23 n-fatty acids and 6 dicarboxylic acids, 5 aromatic acids.The total concentration of n-fatty acids was 62-664 ng·m-3, and the C16 acid was the most abundant acid,followed by C18.
