Effects of anthropogenic emissions and meteorological conditions on diurnal variation of formaldehyde (HCHO) in the Yangtze River Delta, China

Gao, Yurong; Pan, Hao; Cao, Le; Lu, Chen; Yang, Quan-Hui; Lu, Xichang; Ding, Hongyi; Li, Simeng; Zhao, Tianliang

doi:10.1016/j.apr.2023.101779

Cited by 4 publications

(6 citation statements)

References 39 publications

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“…The mean diurnal NO 2 lifetimes from May to September vary from about 1.64 to 9.81 h, which is consistent with previous estimates. , According to chemical model simulations, the variation of NO 2 chemical lifetime during the study period is mainly influenced by the photochemical reaction rate of OH oxidation. We find that NO 2 lifetimes are shortest at noon, such as in Pyeongchang, Tinh Gia, and Taibei, which may be related to faster photochemical rates in higher temperatures and UV radiation . In addition, NO 2 lifetimes during the daytime remain relatively stable in cities with a polluted background, e.g., in Qingdao, diurnal NO 2 lifetimes fluctuate around 2.30–2.82 h. This stability may be because changes in the local lifetime of NO 2 are influenced more by diffusion than by chemical decay.…”

Section: Results and Discussionmentioning

confidence: 77%

“…We find that NO 2 lifetimes are shortest at noon, such as in Pyeongchang, Tinh Gia, and Taibei, which may be related to faster photochemical rates in higher temperatures and UV radiation. 42 In addition, NO 2 lifetimes during the daytime remain relatively stable in cities with a polluted background, e.g., in Qingdao, diurnal NO 2 lifetimes fluctuate around 2.30− 2.82 h. This stability may be because changes in the local lifetime of NO 2 are influenced more by diffusion than by chemical decay.…”

Section: Diurnal Variations In Nomentioning

confidence: 99%

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Estimating Hourly Nitrogen Oxide Emissions over East Asia from Geostationary Satellite Measurements

Xu,

Zhang,

Xue

et al. 2023

Environ. Sci. Technol. Lett.

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Bottom-up emission inventories of atmospheric nitrogen oxides (NO x = NO + NO2) are usually limited to annual updates and have large uncertainties. The recent launch of the Geostationary Environmental Monitoring Spectrometer (GEMS) first provides hourly measurements of trace gas pollutants from space, enabling new insights into the diurnal variations in anthropogenic NO x emissions. In this study, we present an improved top-down estimation of NO x emission using GEMS NO2 observations and characterize the hourly NO x emissions over cities in East Asia. We use the Gaussian model and polynomial fitting to calculate the hourly NO2 lifetimes for several “point-source” cities and then derive NO x emissions using the flux divergence method. GEMS observations show significant hourly variations in the NO x emissions. Systematic biases in NO x emission estimates are found between the GEMS-based hourly estimations and previous polar-orbiting satellites with a single daily overpass. Compared to using empirically diurnal emission factors, chemical model simulations using GEMS-based NO x emissions substantially reduce the biases with satellite and surface NO2 measurements (e.g., for Wuhan, the biases decreased by 31%). This study highlights the essential role of geostationary satellite observations in characterizing the emission and chemistry of atmospheric pollutants and informing emission control policies.

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Section: Results and Discussionmentioning

confidence: 77%

Section: Diurnal Variations In Nomentioning

confidence: 99%

Estimating Hourly Nitrogen Oxide Emissions over East Asia from Geostationary Satellite Measurements

Xu,

Zhang,

Xue

et al. 2023

Environ. Sci. Technol. Lett.

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“…This phenomenon is attributed to the high density of population and cars at the NJ site. In addition to anthropogenic sources, biological sources are also one of the reasons for the higher HCHO at the NJ site [7]. As an island region, the AE value of the ZS site fluctuated greatly at different altitude levels; in particular, the frequency of the AE value greater than 0.8 km −1 was generally higher than that of the NJ site (Figure 4a,d).…”

Section: Spatiotemporal Variations Of Ae No 2 and Hchomentioning

confidence: 96%

Section: Spatiotemporal Variations Of Ae No 2 and Hchomentioning

confidence: 99%

“…There have been many meaningful research results on the causes of air pollution in the YRD [5], but previous studies have focused on single or multiple pollutant gases in a single city, regional distribution characteristics, and air pollution conditions in the industrially developed areas of the YRD [6,7]. Few studies have explored the differences between inland and island regions.…”

Section: Introductionmentioning

confidence: 99%

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Differences in the Vertical Distribution of Aerosols, Nitrogen Dioxide, and Formaldehyde between Islands and Inland Areas: A Case Study in the Yangtze River Delta of China

Ou,

Hu,

Xing

et al. 2023

Remote Sensing

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Due to the difference of industrialization degree and meteorological conditions, there are obvious differences in the composition of air pollution between islands and inland areas. With Zhoushan (ZS) and Nanjing (NJ) representing islands and inland cities in the Yangtze River Delta, the differences in vertical distribution of atmospheric components were investigated. A combination of multi-axial differential optical absorption spectroscopy (MAX-DOAS), weather research and forecasting (WRF), and potential source contribution function (PSCF) models were used to obtain vertical distribution data for aerosols, nitrogen dioxide (NO2) and formaldehyde (HCHO), meteorological factors, and pollution sources in summer 2019. The findings indicate that, except for the aerosol extinction coefficient (AE), the atmospheric composition at the ZS site was not significantly stratified. However, the AE, NO2, and HCHO at NJ all displayed a decreasing trend with altitude. Here is the interesting finding that the ZS site has a higher AE value than the NJ site, while NJ displays higher NO2 and HCHO columns than the ZS site. This discrepancy was primarily attributable to Zhoushan City’s extremely low traffic emissions when compared to inland cities. In addition, HCHO in the YRD region was significantly affected by human activities. Analysis of potential pollution sources found that regional transport contributed to differences in atmospheric composition at different altitudes in different regions. Aerosols, NO2, and HCHO in Nanjing were significantly affected by transport in inland areas. Aerosols in Zhoushan were easily affected by transport in the Yellow Sea and East China Sea, and NO2 and HCHO were significantly affected by transport contributions from surrounding areas in inland areas. The study strongly suggests that land and sea breezes play an important role in the vertical distribution of aerosols over island regions.

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Enhanced oxygen activation over self-supporting Cu2+ doped Co3O4 nanoneedle arrays for efficient HCHO oxidation at room temperature

Chen,

Yang,

Liu

et al. 2024

Separation and Purification Technology

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Effects of anthropogenic emissions and meteorological conditions on diurnal variation of formaldehyde (HCHO) in the Yangtze River Delta, China

Cited by 4 publications

References 39 publications

Estimating Hourly Nitrogen Oxide Emissions over East Asia from Geostationary Satellite Measurements

Estimating Hourly Nitrogen Oxide Emissions over East Asia from Geostationary Satellite Measurements

Differences in the Vertical Distribution of Aerosols, Nitrogen Dioxide, and Formaldehyde between Islands and Inland Areas: A Case Study in the Yangtze River Delta of China

Enhanced oxygen activation over self-supporting Cu2+ doped Co3O4 nanoneedle arrays for efficient HCHO oxidation at room temperature

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