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An improved TROPOMI tropospheric HCHO retrieval over China
Atmospheric Measurement Techniques ( IF 3.2 ) Pub Date : 2020-11-23 , DOI: 10.5194/amt-13-6271-2020 Wenjing Su , Cheng Liu , Ka Lok Chan , Qihou Hu , Haoran Liu , Xiangguang Ji , Yizhi Zhu , Ting Liu , Chengxin Zhang , Yujia Chen , Jianguo Liu
Atmospheric Measurement Techniques ( IF 3.2 ) Pub Date : 2020-11-23 , DOI: 10.5194/amt-13-6271-2020 Wenjing Su , Cheng Liu , Ka Lok Chan , Qihou Hu , Haoran Liu , Xiangguang Ji , Yizhi Zhu , Ting Liu , Chengxin Zhang , Yujia Chen , Jianguo Liu
We present an improved TROPOspheric Monitoring Instrument
(TROPOMI) retrieval of formaldehyde (HCHO) over China. The new retrieval
optimizes the slant column density (SCD) retrieval and air mass factor (AMF)
calculation for TROPOMI observations of HCHO over China. Retrieval of HCHO
differential SCDs (DSCDs) is improved using the basic optical differential
spectroscopy (BOAS) technique resulting in lower noise and smaller random
error, while AMFs are improved with a priori HCHO profiles from a higher
resolution regional chemistry transport model. Compared to the operational
product, the new TROPOMI HCHO retrieval shows better agreement with ground-based Multi-AXis Differential Optical Absorption Spectroscopy (MAX-DOAS)
measurements in Beijing. The improvements are mainly related to the AMF
calculation with more precise a priori profiles in winter. Using more
precise a priori profiles in general reduces HCHO vertical column densities (VCDs) by 52.37 %
(± 27.09 %) in winter. Considering the aerosol effect in AMF
calculation reduces the operational product by 11.46 % (± 1.48 %) and our retrieval by 17.61 % (± 1.92 %)
in winter. The improved and operational HCHO are also used to investigate
the spatial–temporal characteristics of HCHO over China. The result shows
that both improved and operational HCHO VCDs reach maximum in summer and
minimum in winter. High HCHO VCDs mainly located over populated areas, i.e.,
Sichuan Basin and central and eastern China, indicate a significant
contribution of anthropogenic emissions. The hotspots are more obvious on
the map of the improved HCHO retrieval than the operational product. The result indicates that
the improved TROPOMI HCHO retrieval is more suitable for the analysis of regional- and
city-scale pollution in China.
更新日期：2020-11-23
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