QA4ECV NO2 tropospheric and stratospheric column data from OMI

The QA4ECV NO2 Essential Climate Variable precursor product contains
harmonized vertical NO2 column data: tropospheric vertical column
densities and stratospheric vertical column densities.

The NO2 ECV precursor data in this dataset provides geophysical
information for ground pixels observed by the Ozone Monitoring
Instrument (OMI, aboard the EOS-Aura satellite; overpass time:
circa 13:40 hrs) for the period October 2004 onwards.

In addition to the vertical NO2 columns, the product contains
intermediate results, such as the result of the spectral fit,
fitting diagnostics, the averaging kernel, cloud information,
and algorithm and product uncertainty estimates.

QA4ECV NO₂ 基本气候变量（Essential Climate Variable, ECV）前驱数据集包含经匀质化处理的垂直柱NO₂数据：对流层垂直柱密度与平流层垂直柱密度。

本数据集内的NO₂ ECV前驱数据，可为2004年10月起由臭氧监测仪（Ozone Monitoring Instrument, OMI，搭载于EOS-Aura卫星，过境时间约13:40）观测到的地面像元提供地球物理信息。

除垂直柱NO₂数据外，该数据集还包含各类中间结果，例如光谱拟合结果、拟合诊断信息、平均核、云信息，以及算法与产品的不确定性估计值。