Vertical profiles of global seasonal mean nitrogen dioxide in five distinct layers in the troposphere

Two datasets (and files) are provided. Both are vertical profiles of tropospheric nitrogen dioxide (NO2) in five distinct layers in the atmosphere: one in the boundary layer (below 800 hPa), two in the middle troposphere (800-600 hPa, 600-450 hPa), and two in the upper troposphere (450-320 hPa, 320-180 hPa). The first is derived with TROPOMI satellite observations and the second simulated with the GEOS-Chem chemical transport model (CTM).The satellite-derived data are obtained by cloud-slicing TROPOMI partial columns (stratosphere + troposphere) of NO2 retrieved above optically thick clouds (optical cloud fraction > 0.7) from June 2018 to May 2022 to obtain seasonal multiyear mean global gridded (1o x 1o) NO2.The second dataset is GEOS-Chem NO2 at 2o x 2.5o sampled at 12:00-15:00 local solar time (LST) to be centred at the TROPOMI overpass time (13:30 LST). The model data are also multiyear means, but for 2016-2019.Evaluation of the satellite-derived data against NASA DC8 aircraft observations and application of the evaluated cloud-sliced data to assess current understanding of tropospheric NOx as simulated with the GEOS-Chem model are detailed in the accompanying paper submitted for review in the Atmospheric Chemistry and Physics (ACP) journal.

本数据集包含两组（及其相关文件），均为大气中不同层位的对流层二氧化氮（NO2）垂直廓线数据，共计五层：一层位于边界层（低于800 hPa），两层位于中纬度对流层（800-600 hPa，600-450 hPa），以及两层位于高层对流层（450-320 hPa，320-180 hPa）。第一组数据基于TROPOMI卫星观测获得，第二组数据则由GEOS-Chem化学传输模型（CTM）模拟生成。卫星观测数据通过在光学厚云层（光学云量大于0.7）上对TROPOMI部分大气柱（平流层+对流层）中的NO2进行云切片处理，并从2018年6月至2022年5月获取季节性多年平均全球格网（1o x 1o）NO2。第二组数据为GEOS-Chem模型下的NO2，以2o x 2.5o的分辨率，于当地时间12:00-15:00（LST）采样，以与TROPOMI过境时间（13:30 LST）对齐。模型数据同样为多年平均值，但时间范围为2016-2019年。在配套论文中，详细描述了基于NASA DC8飞机观测对卫星数据的评估，以及将该评估的云切片数据应用于评估GEOS-Chem模型模拟的对流层NOx的理解，该论文已提交至《大气化学与物理》（ACP）期刊进行审阅。