MAX-DOAS and OMI Measurements of Tropospheric NO2 and HCHO over Eastern China

doi:10.11947/j.JGGS.2020.0401

Abstract

Abstract:

In this paper, we present long term observations of atmospheric nitrogen dioxide (NO₂) 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 NO₂ and HCHO vertical column densities (VCDs) are used to validate OMI satellite observations over Nanjing. The comparison shows that the OMI observations of NO₂ 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 NO₂ and HCHO to reconstruct the spatial distribution of NO₂ and HCHO over the Yangtze River Delta during summer and winter time. The reconstructed NO₂ 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 the 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.

Key words: MAX-DOAS; OMI; NO₂; formaldehyde; pollution transport

Ka-Lok CHAN,Zhuoru WANG,Aijun DING,Klaus-Peter HEUE,Nan HAO,Mark WENIG. MAX-DOAS and OMI Measurements of Tropospheric NO₂ and HCHO over Eastern China[J]. Journal of Geodesy and Geoinformation Science, 2020, 3(4): 1-13.

Figures/Tables 6

Tab.1

The DOAS retrieval settings for different wavelength bands"

Species	Temperature	Wavelength Range		Reference
Species	Temperature	324.5~359nm	338~370nm	Reference
BrO	223 K	√	√	Literature [32]
HCHO	298 K	√	√	Literature [33
N $O 2 (a)$	298 K	√	√	Literature [34]
N $O 2 (a)$	220 K	—	√	Literature [34]
$O 3 (b)$	223 K	√	√	Literature [35]
$O 3 (b)$	243 K	√	√	Literature [35]
O₄	293 K	√	√	Literature [36]
Ring	—	√	√	—
Polynomial	—	5^th order	5^th order	—

Tab.1

Fig.1

Fig.2

Fig.3

Fig.4

Fig.5

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MAX-DOAS and OMI Measurements of Tropospheric NO₂ and HCHO over Eastern China

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