Intercomparison of slant column measurements of NO 2 and O 4 by MAX-DOAS and zenith-sky UV and visible spectrometers
Intercomparison of slant column measurements of NO 2 and O 4 by MAX-DOAS and zenith-sky UV and visible spectrometers
复制标题
DOI：
10.5194/amt-3-1629-2010
复制
发表时间：
2010-11
期刊：
影响因子：
--
通讯作者：
中科院分区：
文献类型：
--
作者：
抽象的。2009年6月，来自14个研究所的22台光谱仪在北卡罗来纳州卡博(北纬51.97°，东经4.93°)举行的二氧化氮测量仪器卡博国际比对活动期间，连续11天从地面测量了对流层和平流层二氧化氮。所有可见仪器都使用一个共同的波长范围和一组截面进行光谱分析。大多数仪器采用多轴设计，采用差示光谱分析软件(MAX-DOAS)，在取30分钟平均值后，通过检查其最小二乘直线与所选仪器平均值的斜率来比较其非天顶斜柱。将接近黄昏的天顶斜柱与参考仪器的插值值进行拟合比较，然后通过最佳仪器的斜率的平均值进行归一化。对于可见的MAX-DOAS仪器，除一台仪器外，所有仪器对NO2和O4的拟合斜率在几乎所有非天顶高程的平均值都在10%以内，大部分在5%以内。UV MAX-DOAS仪器的值也差不多，分别为12%和7%。对于接近黄昏的天顶可见仪器，所有仪器的拟合斜率的平均值均在5%以内。这一一致性水平与之前的相互比较一样好，尽管该地点不是测量天顶黄昏的理想地点。这预示着对流层NO2测量的未来，因为以前的相互比较只针对专注于平流层NO2的天顶仪器，因为它们的历史更长。
Abstract. In June 2009, 22 spectrometers from 14 institutes measured tropospheric and stratospheric NO2 from the ground for more than 11 days during the Cabauw Intercomparison Campaign of Nitrogen Dioxide measuring Instruments (CINDI), at Cabauw, NL (51.97° N, 4.93° E). All visible instruments used a common wavelength range and set of cross sections for the spectral analysis. Most of the instruments were of the multi-axis design with analysis by differential spectroscopy software (MAX-DOAS), whose non-zenith slant columns were compared by examining slopes of their least-squares straight line fits to mean values of a selection of instruments, after taking 30-min averages. Zenith slant columns near twilight were compared by fits to interpolated values of a reference instrument, then normalised by the mean of the slopes of the best instruments. For visible MAX-DOAS instruments, the means of the fitted slopes for NO2 and O4 of all except one instrument were within 10% of unity at almost all non-zenith elevations, and most were within 5%. Values for UV MAX-DOAS instruments were almost as good, being 12% and 7%, respectively. For visible instruments at zenith near twilight, the means of the fitted slopes of all instruments were within 5% of unity. This level of agreement is as good as that of previous intercomparisons, despite the site not being ideal for zenith twilight measurements. It bodes well for the future of measurements of tropospheric NO2, as previous intercomparisons were only for zenith instruments focussing on stratospheric NO2, with their longer heritage.