Decoupling in the vertical shape of HCHO during a sea breeze event: The effect on trace gas satellite retrievals and column-to-surface translation

Souri, Amir H.; Kumar, Rajesh; Chong, Heesung; Golbazi, Maryam; Knowland, K. Emma; Geddes, Jeffrey A.; Johnson, Matthew S.

doi:10.1016/j.atmosenv.2023.119929

Cited by 4 publications

(7 citation statements)

References 68 publications

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“…Past studies have shown that mid-day FNR VCDs are similar to those observed at the surface (Jin et al, 2017;Souri et al, 2023a). However, during times where HCHO and NO2 vertical profiles in the troposphere are complex, models and satellites may be challenged to accurately assess conversion ratios of VCD FNRs to PBL/surface values (e.g., Souri et al, 2023b). This better precision compared to OMI observations primarily due to improvements in HCHO product performance (e.g., Johnson et al, 2023).…”

Section: Discussionmentioning

confidence: 97%

“…OMI VCD HCHO data is unable to replicate the interannual variability and long-term trends of surface data displayed by the low correlation values and opposing trends in multiple large cities in the US. The inability of OMI to reflect the variability in HCHO observed at the surface is likely due to the large noise in OMI HCHO retrievals (e.g., Johnson et al, 2023, Souri et al, 2023a and complex vertical distributions of HCHO complicating satellite retrievals and understanding surface values (e.g., Souri et al, 2023b). OMI VCD and in situ AQS data of NO2 display a different story where significant reductions in NO2 concentrations are observed by both data sources.…”

Section: Capability Of Omi Vcd Data To Observe Surface-level Fnr Trendsmentioning

confidence: 99%

“…Using model simulations or in situ data to convert satellite VCD information to surface-level HCHO, NO2, and FNRs concentrations are both inhibited by errors. In situ observations are too sparse and CTMs have system-specific errors/biases and differ largely in their prediction of HCHO and NO2 vertical distributions (Lamsal et al, 2008;Geddes et al, 2016;Souri et al, 2023b). This results in large uncertainties in surface-level FNRs when convolving satellite VCDs.…”

Section: Discussing the Use Of Omi Data To Assess O3 Production Sensi...mentioning

confidence: 99%

“…The ability of VCD information from low earth orbit satellites to capture mid-day surface-level FNR trends might be due to studies showing ratios of VCD FNRs to PBL/surface values are near unity (Jin et al, 2017;Souri et al, 2023a). However, during times where HCHO and NO2 vertical profiles in the troposphere are not similar to climatological averages, models and satellites may be challenged to accurately assess conversion ratios of VCD FNRs to PBL/surface values (e.g., Souri et al, 2023b). Overall, if methods are improved to reduce the uncertainty in the conversion of satellite VCD retrievals of HCHO and NO2 to surface-level concentrations, then satellite-derived surface-level FNRs will be able to be applied in higher confidence for air quality research and potentially policy decisions.…”

Section: Discussing the Use Of Omi Data To Assess O3 Production Sensi...mentioning

confidence: 99%

“…However, this satellite demonstrated less capability to replicate trends of surface-level observations of HCHO. The vertical structure of HCHO can be complex which complicates the relationship between VCDs and surface-level values (Souri et al, 2023b); however, OMI has also been shown to have large systematic and random biases in HCHO retrievals which drive the overall errors in OMI-derived VCD FNRs (Johnson et al, 2023;Souri et al, 2023a). However, since decreasing NO2 emissions/concentrations are the primary reason for the increasing trends of FNRs at the surface, while HCHO has near-neutral trends, and OMI NO2 VCDs have much lower errors compared to HCHO (Johnson et al, 2023;Souri et al, 2023a), this study shows that OMI VCD data of indicator species can still replicate surface-level trends of FNRs.…”

Section: Discussing the Use Of Omi Data To Assess O3 Production Sensi...mentioning

confidence: 99%

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Insights into the long-term (2005–2021) spatiotemporal evolution of summer ozone production sensitivity in the Northern Hemisphere derived with OMI

Johnson,

Philip,

Meech

et al. 2024

Preprint

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Abstract. Tropospheric ozone (O3) formation depends on the relative abundance of precursor species, nitrogen oxides (NOx) and volatile organic compounds (VOCs). Advancements in satellite retrievals of formaldehyde (HCHO) and nitrogen dioxide (NO2) vertical column densities (VCDs), and the corresponding HCHO/NO2 ratios (FNRs), provide the opportunity to diagnose the spatiotemporal evolution of O3 production sensitivity regimes. This study investigates trends of summertime VCD HCHO, NO2, and Ozone Monitoring Instrument (OMI) FNRs in the Northern Hemisphere from 2005 to 2021. FNR trends were analysed for polluted regions, and specifically for 46 highly populated cities, over the entire 17-year period and in 2020 when global anthropogenic emissions were reduced due to COVID-19 lockdown restrictions. It was determined that OMI-derived FNRs have increased on average ~65 % across cities in the Northern Hemisphere. Increasing OMI-derived FNRs indicates a general transition from radical-limited to NOx-limited regimes. The increasing trend is driven by reduced NO2 concentrations because of emission control strategies of NOx. OMI FNR trends were compared to ground-based in situ measurements in US cities and determined they can capture the trends in increasing FNRs (R = 0.91) and decreasing NO2 (R = 0.98) occurring at the surface. OMI FNRs in urban areas were higher (~20 %) in 2020 for most cities studied here compared to 2019 and 2021. In addition to studying the longest period of OMI FNRs across the Northern Hemisphere to-date, the capabilities and challenges of using satellite VCD FNRs to study surface-level O3 production sensitivity regimes are discussed.

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Section: Discussionmentioning

confidence: 97%

Section: Capability Of Omi Vcd Data To Observe Surface-level Fnr Trendsmentioning

confidence: 99%

Section: Discussing the Use Of Omi Data To Assess O3 Production Sensi...mentioning

confidence: 99%

Section: Discussing the Use Of Omi Data To Assess O3 Production Sensi...mentioning

confidence: 99%

Section: Discussing the Use Of Omi Data To Assess O3 Production Sensi...mentioning

confidence: 99%

See 3 more Smart Citations

Insights into the long-term (2005–2021) spatiotemporal evolution of summer ozone production sensitivity in the Northern Hemisphere derived with OMI

Johnson,

Philip,

Meech

et al. 2024

Preprint

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Analysis of the Vertical Distribution and Driving Factors of Aerosol and Ozone Precursors in Huaniao Island, China, Based on Ground-Based MAX-DOAS

Ou,

Hu,

Xing

et al. 2023

Remote Sensing

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Urban air pollution has become a regional environmental problem. In order to explore whether island areas were affected by the urban development of surrounding areas, in this paper, we systematically study the vertical distribution characteristics of atmospheric components, meteorological drivers, potential pollution sources, and the population health risks of fine particulate matter in island cities in China. The vertical profiles of three atmospheric pollutants (aerosols, NO2, and HCHO) in the lower troposphere of Huaniao Island in the East China Sea (ECS) were obtained using ground-based multi-axial differential optical absorption spectroscopy (MAX-DOAS). The results show that the aerosol extinction coefficients, NO2, and HCHO were primarily distributed at altitudes below 1 km, and the atmospheric pollutants in Zhoushan were obviously affected by high-altitude transfer. The main meteorological driving factors of aerosols, NO2, and HCHO were different at different altitudes. The key factor contributing to the high column concentrations of NO2 and HCHO in the upper air (greater than 400 m) was the transport of pollutants brought about by changes in wind speed. By exploring the main potential sources of atmospheric pollutants, it was found that the main sources of aerosols, NO2, and HCHO are coastal cities in the Yangtze River Delta, including southeast Zhejiang Province, southeast Fujian Province, Shanghai, ECS, and the Yellow Sea. Compared with aerosols and HCHO, local primary emissions are an important source of NO2, which are mainly related to industrial activities in Zhoushan Port. In addition, using the expose-response function model, the number of attributable cases of PM2.5 air pollution in Zhoushan City in 2019 accounted for 6.58% of the total population. This study enriches our understanding of the vertical distribution characteristics of atmospheric composition and health risk assessment on Chinese islands.

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Insights into the long-term (2005–2021) spatiotemporal evolution of summer ozone production sensitivity in the Northern Hemisphere derived with the Ozone Monitoring Instrument (OMI)

Johnson,

Philip,

Meech

et al. 2024

Atmos. Chem. Phys.

View full text Add to dashboard Cite

Abstract. Tropospheric ozone (O3) formation depends on the relative abundance of precursor species, nitrogen oxides (NOx), and volatile organic compounds (VOCs). Advancements in satellite retrievals of formaldehyde (HCHO) and nitrogen dioxide (NO2) vertical column densities (VCDs), and the corresponding HCHO/NO2 ratios (FNRs), provide the opportunity to diagnose the spatiotemporal evolution of O3 production sensitivity regimes. This study investigates trends of Ozone Monitoring Instrument (OMI)-derived summertime VCD HCHO, NO2, and FNRs in the Northern Hemisphere from 2005 to 2021. FNR trends were analyzed for polluted regions, specifically for 46 highly populated cities, over the entire 17-year period and in 2020 when global anthropogenic emissions were reduced due to COVID-19 lockdown restrictions. It was determined that OMI-derived FNRs have increased on average by ∼ 65 % across cities in the Northern Hemisphere. Increasing OMI-derived FNRs indicates a general transition from radical-limited to NOx-limited regimes. The increasing trend is driven by reduced NO2 concentrations because of emission-control strategies of NOx. OMI FNR trends were compared to ground-based in situ measurements in US cities, and it was determined that they can capture the trends in increasing FNRs (R=0.91) and decreasing NO2 (R=0.98) occurring at the surface. OMI FNRs in urban areas were higher (∼ 20 %) in 2020 for most cities studied here compared to 2019 and 2021. In addition to studying the longest period of OMI FNRs across the Northern Hemisphere to date, the capabilities and challenges of using satellite VCD FNRs to study surface-level O3 production sensitivity regimes are discussed.

show abstract

Decoupling in the vertical shape of HCHO during a sea breeze event: The effect on trace gas satellite retrievals and column-to-surface translation

Cited by 4 publications

References 68 publications

Insights into the long-term (2005–2021) spatiotemporal evolution of summer ozone production sensitivity in the Northern Hemisphere derived with OMI

Insights into the long-term (2005–2021) spatiotemporal evolution of summer ozone production sensitivity in the Northern Hemisphere derived with OMI

Analysis of the Vertical Distribution and Driving Factors of Aerosol and Ozone Precursors in Huaniao Island, China, Based on Ground-Based MAX-DOAS

Insights into the long-term (2005–2021) spatiotemporal evolution of summer ozone production sensitivity in the Northern Hemisphere derived with the Ozone Monitoring Instrument (OMI)

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