收稿：2019-10-21，
录用：2020-04-16，
纸质出版：2020-06-07
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In this paper
we present long term observations of atmospheric nitrogen dioxide (NO
2
) and formaldehyde (HCHO) in Nanjing using a Multi-AXis Differential Optical Absorption Spectroscopy (MAX-DOAS) instrument. Ground based MAX-DOAS measurements were performed from April 2013 to February 2017. The MAX-DOAS measurements of NO
2
and HCHO Vertical Column Densities (VCDs) are used to validate OMI satellite observations over Nanjing. The comparison shows that the OMI observations of NO
2
correlate well with the MAX-DOAS data with Pearson correlation coefficient (
R
) of 0.91. The comparison result of MAX-DOAS and OMI observations of HCHO VCD shows a good agreement with
R
of 0.75 and the slope of the regression line is 0.99. The age weighted backward propagation approach is applied to the MAX-DOAS measurements of NO
2
and HCHO to reconstruct the spatial distribution of NO
2
and HCHO over the Yangtze River Delta during summer and winter time. The reconstructed NO
2
fields show a distinct agreement with OMI satellite observations. However
due to the short atmospheric lifetime of HCHO
the backward propagated HCHO data does not show a strong spatial correlation with the OMI HCHO observations. The result shows t
he MAX-DOAS measurements are sensitive to the air pollution transportation in the Yangtze River Delta
indicating the air quality in Nanjing is significantly influenced by regional transportation of air pollutants.
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