A Retrieval of Glyoxal from OMI over China: Investigation of the Effects of Tropospheric NO2

Wang, Yapeng; Tao, Jianhua; Cheng, Liangxiao; Yu, Chao; Wang, Zifeng; Chen, Liangfu

doi:10.3390/rs11020137

Cited by 7 publications

(4 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The significant increase of CHOCHO from October may be related to heating during winter. This finding is consistent with glyoxal retrieved over Beijing and Northern China from OMI satellite data [42,43]. The increase in HCHO during summer is considered to be due to the photochemical production of HCHO, biogenic emissions during growing season and the burning of biomass in spring and autumn [31].…”

Section: Discussionsupporting

confidence: 86%

Ground-Based MAX-DOAS Observations of CHOCHO and HCHO in Beijing and Baoding, China

et al. 2019

View full text Add to dashboard Cite

Glyoxal (CHOCHO) and formaldehyde (HCHO) trace gases were successfully retrieved from a multi-axis differential optical absorption spectroscopy (MAX-DOAS) system in Beijing (39.95°N, 116.32°E) and Baoding (39.15°N, 115.40°E), China. The measurements of these trace gases span the period from May 2017 to April 2018. Higher levels of trace gases were observed in Beijing most likely due to increased transport and industrial activities compared to Baoding. Different time scales were analyzed from seasonal to daily levels. Seasonal variation categorized by wintertime maximum and summertime minimum was observed for CHOCHO, while for HCHO maximum values were recorded during summer at both observation points. Variations in the diurnal cycle of trace gases were examined. The results are consistent with strong links to photo-oxidations of VOCs for HCHO production, whereas the CHOCHO diurnal variation can be related to anthropogenic effects in the evening. Weekends didn’t have any significant effect on both HCHO and CHOCHO. We investigated the temperature dependency of HCHO and CHOCHO. HCHO shows positive correlation with air temperature, which strengthened the argument that HCHO production is linked to photo-oxidation of VOCs. CHOCHO is anti-correlated with air temperature. This suggests that photolysis is a major sink for CHOCHO in Beijing and Baoding. We also investigated the relationship between CHOCHO and HCHO VCDs with enhanced vegetation index (EVI) data obtained from MODIS, which represents a direct relation with biogenic emissions. The positive correlations were observed among monthly mean HCHO VCDs and monthly mean EVI at both monitoring stations. The strong correlation of HCHO with EVI found, suggests that oxidation of isoprene and HCHO production is strongly related, while negative correlation was observed among CHOCHO VCDs and EVI.

show abstract

Section: Discussionsupporting

confidence: 86%

Ground-Based MAX-DOAS Observations of CHOCHO and HCHO in Beijing and Baoding, China

et al. 2019

View full text Add to dashboard Cite

show abstract

“…The observed increase in CHOCHO from October may also be related to heating during winter. This finding is consistent with glyoxal retrieved over Beijing and Northern China from OMI (Ozone monitoring instrument) satellite data [35,36]. The increase in the concentration of NO 2 may also be related to an increase in the burning of fossil fuels during the winter months.…”

Section: Dependence Of Trace Gases On Meteorological Parameterssupporting

confidence: 86%

Investigating the Effect of Different Meteorological Conditions on MAX-DOAS Observations of NO2 and CHOCHO in Hefei, China

et al. 2019

View full text Add to dashboard Cite

In this work, a ground-based remote sensing instrument was used for observation of the trace gases NO2 and CHOCHO in Hefei, China. Excessive development and rapid economic growth over the years have resulted in the compromising of air quality in this city, with haze being the most prominent environmental problem. This is first study covering observation of CHOCHO in Hefei (31.783° N, 117.201° E). The observation period of this study, i.e., July 2018 to December 2018, is divided into three different categories: (1) clear days, (2) haze days, and (3) severe haze days. The quality of the differential optical absorption spectroscopy (DOAS) fit for both CHOCHO and NO2 was low during severe haze days due to a reduced signal to noise ratio. NO2 and CHOCHO showed positive correlations with PM2.5, producing R values of 0.95 and 0.98, respectively. NO2 showed strong negative correlations with visibility and air temperature, obtaining R values of 0.97 and 0.98, respectively. CHOCHO also exhibited strong negative correlations with temperature and visibility, displaying R values of 0.83 and 0.91, respectively. The average concentration of NO2, CHOCHO, and PM2.5 during haze days was larger compared to that of clear days. Diurnal variation of both CHOCHO and NO2 showed a significant decreasing trend in the afternoons during clear days due to photolysis, while during haze days these two gases started to accumulate as their residence time increases in the absence of photolysis. There was no prominent weekly cycle for both trace gases.

show abstract

“…Based on this assumption, troposphere columns of both NO 2 , SO 2 and CO are the integral of the concentrations with respect to the height. The concentrations of NO 2 , SO 2 and CO was obtained using Equations (3)-(5), demonstrated in previous studies [35][36][37][38]:…”

Section: Pollutant Concentration Estimationmentioning

confidence: 99%

Spatial Assessment of Health Economic Losses from Exposure to Ambient Pollutants in China

Wang

et al. 2020

Remote Sensing

View full text Add to dashboard Cite

Increasing emissions of ambient pollutants have caused considerable air pollution and negative health impact for human in various regions of China over the past decade. The resulting premature mortality and excessive morbidity caused huge human economic losses to the entire society. To identify the differences of health economic losses in various regions of China and help decision-making on targeting pollutants control, spatial assessment of health economic losses due to ambient pollutants in China is indispensable. In this study, to better represent the spatial variability, the satellite-based retrievals of the concentrations of various pollutants (PM 10 , PM 2.5 , O 3 , NO 2 , SO 2 and CO) for the time period from 2007 to 2017 in China are used instead of using in-situ data. Population raster data were applied together with exposure-response function to calculate the spatial distribution of health impact and then the health impact is further quantified by using amended human capital (AHC) approach. The results which presented in a spatial resolution of 0.25 • × 0.25 • , show the signification contribution from the spatial assessment to revealing the spatial distribution and variance of health economic losses in various regions of China. Spatial assessment of overall health economic losses is different from conventional result due to more detail spatial information. This spatial assessment approach also provides an alternative method for losses measurement in other fields.

show abstract

A Retrieval of Glyoxal from OMI over China: Investigation of the Effects of Tropospheric NO2

Cited by 7 publications

References 51 publications

Ground-Based MAX-DOAS Observations of CHOCHO and HCHO in Beijing and Baoding, China

Ground-Based MAX-DOAS Observations of CHOCHO and HCHO in Beijing and Baoding, China

Investigating the Effect of Different Meteorological Conditions on MAX-DOAS Observations of NO2 and CHOCHO in Hefei, China

Spatial Assessment of Health Economic Losses from Exposure to Ambient Pollutants in China

Contact Info

Product

Resources

About