MAX-DOAS retrievals of formaldehyde (HCHO) and nitrogen dioxide (NO2) vertical profiles over Central London

Compressed zipped files of MAX-DOAS measurements at the Central London University College London monitoring site from 1 July to 30 September 2022. 
Includes three compressed files of daily MAX-DOAS observations of HCHO, NO2, and O4 in NetCDF format. Each compressed file is the collection of measurements for the three optimized azimuth angles. 
Data variables in each NetCDF file are:

NO2 vertical profiles and error estimate in ppbv
HCHO vertical profiles and error estimate in ppbv
Aerosol extinction and error estimate at 360 nm in (1/km)
Qualitative cloud flag

Variables dimensions and units are specified in each file. 
Additional details of retrieval of trace gas profiles and cloud detection are in Ryan et al. (2022), submitted for review to Copernicus' Atmospheric Chemistry and Physics journal Measurement Report stream.

NetCDF file of hourly isoprene concentrations at the London Marylebone Road monitoring site from 1 July to 30 September 2022. The file includes isoprene concentrations in ug/m3 and ppbv directly measured and derived using the strong linear relationship bewteen hourly isoprene at Marylebone Road and the London Eltham site. 

UCL MAX-DOAS photo credit: Robert G Ryan.

包含从2022年7月1日至9月30日在伦敦大学学院伦敦监测站进行的MAX-DOAS测量的压缩ZIP文件。该数据集包含每日的HCHO、NO2和O4的MAX-DOAS观测数据的三个压缩文件，这些数据以NetCDF格式存储。每个压缩文件均汇集了针对三个优化方位角的测量数据。NetCDF文件中的数据变量包括：NO2的垂直廓线及其误差估计（单位：ppbv）、HCHO的垂直廓线及其误差估计（单位：ppbv）、在360 nm波长的气溶胶消光及其误差估计（单位：(1/km)）以及定性云标志。每个文件中均详细说明了变量维度和单位。有关提取痕量气体廓线和云检测的详细信息，请参阅Ryan等（2022）的论文，该论文已提交至Copernicus大气化学与物理学期刊的测量报告流进行评审。此外，还包括了从2022年7月1日至9月30日在伦敦Marylebone Road监测站每小时异戊二烯浓度的NetCDF文件。该文件包含异戊二烯浓度（单位：ug/m3和ppbv），这些浓度是通过测量Marylebone Road和伦敦Eltham站点每小时异戊二烯的强线性关系直接和导出得到的。UCL MAX-DOAS图片归Robert G Ryan所有。