Pollution plumes observed by aircraft over North China during the IPAC-NC field campaign

Ma, Jianzhong; Wang, Wei; Liu, Hongjie; Chen, Yue; Xu, Xiangde; Lelieveld, Jos

doi:10.1007/s11434-013-5978-9

Cited by 4 publications

(1 citation statement)

References 48 publications

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“…Recently, its application to the estimation of NO x emissions has been widely reported. NO x emission rates are derived by constraining satellite observations using the relationship between model-simulated NO 2 vertical column density (VCD) and primary NO x emission estimates from the bottom-up approach (Martin, 2002;Jaeglé et al, 2005;Konovalov et al, 2006;Wang et al, 2007;Lin et al, 2012;Zyrichidou et al, 2015). Nevertheless, errors and uncertainties still exist in the retrieval of satellite data, which leads to a large decrease in the accuracy of estimated emissions, particularly in highly polluted regions such as Beijing and its surroundings (Ma et al, 2013a;Jin et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Retrieving tropospheric NO2 vertical column densities around the city of Beijing and estimating NOx emissions based on car MAX-DOAS measurements

Cheng

Jin

et al. 2020

Atmos. Chem. Phys.

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Abstract. We carried out 19 city-circle-around car multi-axis differential optical absorption spectroscopy (MAX-DOAS) experiments on the 6th Ring Road of Beijing in January, September, and October 2014. The tropospheric vertical column densities (VCDs) of NO2 were retrieved from measured spectra by the MAX-DOAS technique and used to estimate the emissions of NOx (≡NO+NO2) from urban Beijing during the experimental periods. The offline LAPS-WRF-CMAQ model system was used to simulate the wind fields by assimilation of observational data and calculate the NO2-to-NOx concentration ratios, both of which are also needed for the estimation of NOx emissions. The NOx emissions in urban Beijing for the different months derived from the car MAX-DOAS measurements in this study were compared to the multi-resolution emission inventory in China for 2012 (MEIC 2012). Our car MAX-DOAS measurements showed higher NO2 VCD in January than in the other two months. The wind field had obvious impacts on the spatial distribution of NO2 VCD, with the mean NO2 VCD along the 6th Ring Road typically being higher under the southerly wind than under the northerly wind. In addition to the seasonal difference, the journey-to-journey variations of estimated NOx emission rates (ENOx) were large even within the same month, mainly due to uncertainties in the calculations of wind speed, the ratio of NO2 and NOx concentration, and the decay rate of NOx from the emission sources to the measured positions under different meteorological conditions. The ranges of ENOx during the heating and non-heating periods were 22.6×1025 to 31.3×1025 and 9.6×1025 to 12.0×1025 molec. s−1, respectively. The average ENOx values in the heating and non-heating periods were 26.9±6.1×1025 molec. s−1 and 11.0±1.2×1025 molec. s−1, respectively. The uncertainty range of ENOx was 20 %–52 %. The monthly emission rates from MEIC 2012 are found to be lower than the estimated ENOx, particularly in January. Our results provide important information and datasets for the validation of satellite products and also show how car MAX-DOAS measurements can be used effectively for dynamic monitoring and updating of the NOx emissions from megacities such as Beijing.

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Section: Introductionmentioning

confidence: 99%

Retrieving tropospheric NO2 vertical column densities around the city of Beijing and estimating NOx emissions based on car MAX-DOAS measurements

Cheng

Jin

et al. 2020

Atmos. Chem. Phys.

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ROx Budgets and O3 Formation during Summertime at Xianghe Suburban Site in the North China Plain

Xue

Tang

et al. 2021

Adv. Atmos. Sci.

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Photochemical smog characterized by high concentrations of ozone (O 3 ) is a serious air pollution issue in the North China Plain (NCP) region, especially in summer and autumn. For this study, measurements of O 3 , nitrogen oxides (NO x ), volatile organic compounds (VOCs), carbon monoxide (CO), nitrous acid (HONO), and a number of key physical parameters were taken at a suburban site, Xianghe, in the NCP region during the summer of 2018 in order to better understand the photochemical processes leading to O 3 formation and find an optimal way to control O 3 pollution. Here, the radical chemistry and O 3 photochemical budget based on measurement data from 1−23 July using a chemical box model is investigated. The daytime (0600−1800 LST) average production rate of the primary radicals referred to as RO x (OH + HO 2 + RO 2 ) is 3.9 ppbv h −1 . HONO photolysis is the largest primary RO x source (41%). Reaction of NO 2 + OH is the largest contributor to radical termination (41%), followed by reactions of RO 2 + NO 2 (26%). The average diurnal maximum O 3 production and loss rates are 32.9 ppbv h −1 and 4.3 ppbv h −1 , respectively. Sensitivity tests without the HONO constraint lead to decreases in daytime average primary RO x production by 55% and O 3 photochemical production by 42%, highlighting the importance of accurate HONO measurements when quantifying the RO x budget and O 3 photochemical production. Considering heterogeneous reactions of trace gases and radicals on aerosols, aerosol uptake of HO 2 contributes 11% to RO x sink, and the daytime average O 3 photochemical production decreases by 14%. The O 3 -NO x -VOCs sensitivity shows that the O 3 production at Xianghe during the investigation period is mainly controlled by VOCs.

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Review of aircraft measurements over China: aerosol, atmospheric photochemistry, and cloud

Quan

Jia

2020

Atmospheric Research

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Pollution plumes observed by aircraft over North China during the IPAC-NC field campaign

Cited by 4 publications

References 48 publications

Retrieving tropospheric NO<sub>2</sub> vertical column densities around the city of Beijing and estimating NO<sub><i>x</i></sub> emissions based on car MAX-DOAS measurements

Retrieving tropospheric NO<sub>2</sub> vertical column densities around the city of Beijing and estimating NO<sub><i>x</i></sub> emissions based on car MAX-DOAS measurements

ROx Budgets and O3 Formation during Summertime at Xianghe Suburban Site in the North China Plain

Review of aircraft measurements over China: aerosol, atmospheric photochemistry, and cloud

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Pollution plumes observed by aircraft over North China during the IPAC-NC field campaign

Cited by 4 publications

References 48 publications

Retrieving tropospheric NO&lt;sub&gt;2&lt;/sub&gt; vertical column densities around the city of Beijing and estimating NO&lt;sub&gt;&lt;i&gt;x&lt;/i&gt;&lt;/sub&gt; emissions based on car MAX-DOAS measurements

Retrieving tropospheric NO&lt;sub&gt;2&lt;/sub&gt; vertical column densities around the city of Beijing and estimating NO&lt;sub&gt;&lt;i&gt;x&lt;/i&gt;&lt;/sub&gt; emissions based on car MAX-DOAS measurements

ROx Budgets and O3 Formation during Summertime at Xianghe Suburban Site in the North China Plain

Review of aircraft measurements over China: aerosol, atmospheric photochemistry, and cloud

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Retrieving tropospheric NO<sub>2</sub> vertical column densities around the city of Beijing and estimating NO<sub><i>x</i></sub> emissions based on car MAX-DOAS measurements

Retrieving tropospheric NO<sub>2</sub> vertical column densities around the city of Beijing and estimating NO<sub><i>x</i></sub> emissions based on car MAX-DOAS measurements