Modeling of HCHO and CHOCHO at a semi-rural site in southern China during the PRIDE-PRD2006 campaign

Li, X.; Rohrer, Franz; Brauers, T.; Hofzumahaus, A.; Lu, Keding; Shao, Min; Zhang, Y. H.; Wahner, Andreas

doi:10.5194/acp-14-12291-2014

Cited by 65 publications

(74 citation statements)

References 48 publications

(92 reference statements)

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“…More specifically, as indicated in Figure S6, the higher mixing ratio of HCHO was found associated with higher temperature while RH and wind field had a minor impact during the day in Shenzhen, which provides further evidence for the photochemical origin of HCHO. The discrepancy between summer and winter is not as prominent as that in other inland cities, which may be associated with the relatively smaller temperature difference and the unfavorable vertical diffusion conditions in the PRD in winter (Guo et al, ; X. Huang et al, ).…”

Section: Resultsmentioning

confidence: 86%

“…Measurement techniques of atmospheric HCHO have rapidly developed in the past decade (Hak et al, ; Ho et al, ; Li et al, ), among which the method of 2,4‐dinitrophenylhydrazine followed by high‐performance liquid chromatography (Pang & Mu, ; Shao et al, ; Wang et al, ), fluorometry based on a diffusion scrubber and the Hantzsch reaction (Li et al, , ; M. Li et al, ), differential optical absorption spectroscopy (X. Li et al, , ), infrared absorption (Wert et al, ), and laser‐induced fluorescence (Cazorla et al, ; Hottle et al, ) are popular methods to measure HCHO. Proton transfer reaction‐mass spectrometry (PTR‐MS) is a relatively novel method that can be employed for fast measurements of HCHO and other OVOCs simultaneously (Inomata et al, ; Karl et al, ; Steinbacher et al, ; Zheng et al, ).…”

Section: Introductionmentioning

confidence: 99%

“…In addition, HCHO is regarded as one of the most important precursors in O 3 formation and accounted for 27.6% and 20% of the total O 3 formation potential in an urban and rural area in China, respectively (Duan et al, ; Wang et al, ). Note that HCHO results with high time resolutions are limited among these studies, which have focused on Beijing (Chen et al, ; Li et al, ), the Pearl River Delta (PRD) region (Cui et al, ; X. Li et al, , ), the Yangtze River Delta region (Ma et al, ; Wang et al, ), and the Mount Tai (Inomata et al, ). High temporal resolution is essential for the study of active ambient HCHO.…”

Section: Introductionmentioning

confidence: 99%

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Sources and Potential Photochemical Roles of Formaldehyde in an Urban Atmosphere in South China

et al. 2017

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Formaldehyde (HCHO) is an important intermediate in tropospheric photochemistry. However, study of its evolution characteristics under heavy pollution conditions in China is limited, especially for high temporal resolutions, making it difficult to analyze its sources and environmental impacts. In this study, ambient levels of HCHO were monitored using a proton‐transfer reaction mass spectrometer at an urban site in the Pearl River Delta of China. Continuous monitoring campaigns were conducted in the spring, summer, fall, and winter in 2016. The highest averaged HCHO concentrations were observed in autumn (5.1 ± 3.1 ppbv) and summer (5.0 ± 4.4 ppbv), followed by winter (4.2 ± 2.2 ppbv) and spring (3.4 ± 1.6 ppbv). The daily maximum of HCHO occurs in the early afternoon and shows good correlations with O3 and the secondary organic aerosol tracer during the day, revealing close relationships between ambient HCHO and secondary formations in Shenzhen, especially in summer and autumn. The daytime HCHO is estimated to be the major contributor to O3 formation and OH radical production, indicating that HCHO plays a key role in the urban atmospheric photochemical reactions. Anthropogenic secondary formation was calculated to be the dominant source of HCHO using a photochemical age‐based parameterization method, with an average proportion of 39%. The contributions of biogenic sources in summer (41%) and autumn (39%) are much higher than those in spring (26%) and winter (28%), while the contributions of anthropogenic primary sources in spring (20%) and winter (18%) are twice those in summer (9%) and autumn (9%).

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Section: Resultsmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sources and Potential Photochemical Roles of Formaldehyde in an Urban Atmosphere in South China

et al. 2017

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“…NO 2 is high but less than in the East China Plain. As pointed out previously by Liu et al (2012) and Li et al (2014), the unusually high CHOCHO concentrations over the PRD can be attributed to high emissions of aromatic VOCs.…”

Section: Methodsmentioning

confidence: 85%

Hotspot of glyoxal over the Pearl River delta seen from the OMI satellite instrument: implications for emissions of aromatic hydrocarbons

et al. 2016

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Abstract. The Pearl River delta (PRD) is a densely populated hub of industrial activity located in southern China. OMI (Ozone Monitoring Instrument) satellite observations reveal a large hotspot of glyoxal (CHOCHO) over the PRD that is almost twice as large as any other in Asia. Formaldehyde (HCHO) and NO 2 observed by OMI are also high in the PRD but no more than in other urban/industrial areas of China. The CHOCHO hotspot over the PRD can be explained by industrial paint and solvent emissions of aromatic volatile organic compounds (VOCs), with toluene being a dominant contributor. By contrast, HCHO in the PRD originates mostly from VOCs emitted by combustion (principally vehicles). By applying a plume transport model to wind-segregated OMI data, we show that the CHOCHO and HCHO enhancements over the PRD observed by OMI are consistent with current VOC emission inventories. Prior work using CHOCHO retrievals from the SCIAMACHY satellite instrument suggested that emission inventories for aromatic VOCs in the PRD were too low by a factor of 10-20; we attribute this result in part to bias in the SCIAMACHY data and in part to underestimated CHOCHO yields from oxidation of aromatics. Our work points to the importance of better understanding CHOCHO yields from the oxidation of aromatics in order to interpret space-based CHOCHO observations in polluted environments.

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“…For example, a recent model study at a semi-rural site in southern China by Li et al (2014) showed 2-5 times higher HCHO than observations. On the other hand, underpredictions have also been found in a few studies (Ayers et al, 1997;Jaegle et al, 2000;Weller et al, 2000;Kormann et al, 2003).…”

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confidence: 92%

Uptake of gaseous formaldehyde by soil surfaces: a combination of adsorption/desorption equilibrium and chemical reactions

Li³

et al. 2016

Atmos. Chem. Phys.

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Abstract. Gaseous formaldehyde (HCHO) is an important precursor of OH radicals and a key intermediate molecule in the oxidation of atmospheric volatile organic compounds (VOCs). Budget analyses reveal large discrepancies between modeled and observed HCHO concentrations in the atmosphere. Here, we investigate the interactions of gaseous HCHO with soil surfaces through coated-wall flow tube experiments applying atmospherically relevant HCHO concentrations of ∼ 10 to 40 ppbv. For the determination of uptake coefficients (γ ), we provide a Matlab code to account for the diffusion correction under laminar flow conditions. Under dry conditions (relative humidity = 0 %), an initial γ of (1.1 ± 0.05) × 10 −4 is determined, which gradually drops to (5.5 ± 0.4) × 10 −5 after 8 h experiments. Experiments under wet conditions show a smaller γ that drops faster over time until reaching a plateau. The drop of γ with increasing relative humidity as well as the drop over time can be explained by the adsorption theory in which high surface coverage leads to a reduced uptake rate. The fact that γ stabilizes at a non-zero plateau suggests the involvement of irreversible chemical reactions. Further back-flushing experiments show that two-thirds of the adsorbed HCHO can be re-emitted into the gas phase while the residual is retained by the soil. This partial reversibility confirms that HCHO uptake by soil is a complex process involving both adsorption/desorption and chemical reactions which must be considered in trace gas exchange (emission or deposition) at the atmosphere-soil interface. Our results suggest that soil and soil-derived airborne particles can either act as a source or a sink for HCHO, depending on ambient conditions and HCHO concentrations.

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Modeling of HCHO and CHOCHO at a semi-rural site in southern China during the PRIDE-PRD2006 campaign

Cited by 65 publications

References 48 publications

Sources and Potential Photochemical Roles of Formaldehyde in an Urban Atmosphere in South China

Sources and Potential Photochemical Roles of Formaldehyde in an Urban Atmosphere in South China

Hotspot of glyoxal over the Pearl River delta seen from the OMI satellite instrument: implications for emissions of aromatic hydrocarbons

Uptake of gaseous formaldehyde by soil surfaces: a combination of adsorption/desorption equilibrium and chemical reactions

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