Retrieval of surface PM2.5 mass concentrations over North China using visibility measurements and GEOS-Chem simulations

Li, Sixuan; Chen, Lulu; Huang, Gang; Lin, Jintai; Yan, Yingying; Ni, Ruijing; Huo, Yanfeng; Wang, Jingxu; Liu, Mengyao; Weng, Hongjian; Wang, Yonghong; Wang, Zifa

doi:10.1016/j.atmosenv.2019.117121

Cited by 15 publications

(6 citation statements)

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“…The patterns of O 3 -induced GPP reductions agree with previous estimates using the same O 3 damage schemes (Sitch et al, 2007;Yue and Unger, 2015). However, compared to simulations using another scheme (Lombardozzi et al, 2012;Zhou et al, 2018;Zhu et al, 2021), this study estimates smaller GPP reductions. Such a discrepancy indicates that there are large uncertainties in O 3 vegetation damage schemes, and more observations should be developed to evaluate different schemes in future studies.…”

Section: Fire-induced O 3 Damage To Gppsupporting

confidence: 85%

“…Lei et al: Indirect contributions of global fires to surface ozone dry deposition. Moreover, weakened leaf-level transpiration following O 3 damage modulates meteorological parameters, such as surface air temperature and atmospheric relative humidity, leading to substantial biogeophysical feedbacks on surface O 3 (Lombardozzi et al, 2012;Sadiq et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

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Indirect contributions of global fires to surface ozone through ozone–vegetation feedback

et al. 2021

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Abstract. Fire is an important source of ozone (O3) precursors. The formation of surface O3 can cause damage to vegetation and reduce stomatal conductance. Such processes can feed back to inhibit dry deposition and indirectly enhance surface O3. Here, we apply a fully coupled chemistry–vegetation model to estimate the indirect contributions of global fires to surface O3 through O3–vegetation feedback during 2005–2012. Fire emissions directly increase the global annual mean O3 by 1.2 ppbv (5.0 %) with a maximum of 5.9 ppbv (24.4 %) averaged over central Africa by emitting a substantial number of precursors. Considering O3–vegetation feedback, fires additionally increase surface O3 by 0.5 ppbv averaged over the Amazon in October, 0.3 ppbv averaged over southern Asia in April, and 0.2 ppbv averaged over central Africa in April. During extreme O3–vegetation interactions, such a feedback can rise to >0.6 ppbv in these fire-prone areas. Moreover, large ratios of indirect-to-direct fire O3 are found in eastern China (3.7 %) and the eastern US (2.0 %), where the high ambient O3 causes strong O3–vegetation interactions. With the likelihood of increasing fire risks in a warming climate, fires may promote surface O3 through both direct emissions and indirect chemistry–vegetation feedbacks. Such indirect enhancement will cause additional threats to public health and ecosystem productivity.

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Section: Fire-induced O 3 Damage To Gppsupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Indirect contributions of global fires to surface ozone through ozone–vegetation feedback

et al. 2021

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“…This model uses a detailed HOx-NOx-VOC-O3-halogen-aerosol tropospheric chemistry to simulate tropospheric O3 fluxes (Barret et al, 2016;Gong and Liao, 2019), while a simplified linearized Linoz chemistry mechanism is applied to simulate stratospheric O3 (McLinden et al, 2000). Aerosols simulated in GEOS-Chem include secondary inorganic aerosols, secondary organic aerosols, primary organic aerosols, black carbon, dust, and sea salt (Dang and Liao, 2019;Li et al, 2019). The gas-aerosol partitioning of the sulfate-nitrate-ammonium system is computed by the ISORROPIA v2.0 thermodynamic equilibrium model (Fountoukis and Nenes, 2007).…”

Section: The Gc-yibs Modelmentioning

confidence: 99%

Indirect contributions of global fires to surface ozone through ozone-vegetation feedback

Lei¹,

Yue²,

Liu³

et al. 2021

Preprint

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Abstract. Fire is an important source of surface ozone (O3), which causes damage to vegetation and reduces stomatal conductance. Such processes can feed back to inhibit dry deposition and indirectly enhance surface O3. Here, we apply a fully coupled chemistry-vegetation model to estimate the indirect contributions of global fires to surface O3 through O3-vegetation feedback during 2005–2012. Fire emissions directly increase the global mean annual O3 by 1.2 ppbv (5.0 %) with a maximum of 5.9 ppbv (24.4 %) averaged over central Africa by emitting substantial number of precursors. Considering O3-vegetation feedback, fires additionally increase surface O3 by 0.5 ppbv averaged over the Amazon in October, 0.3 ppbv averaged over southern Asia in April, and 0.2 ppbv averaged over central Africa in April. During extreme O3-vegetation interactions, such feedback can rise to > 0.6 ppbv in these fire-prone areas. Moreover, large ratios of indirect-to-direct fire O3 are found in eastern China (3.7 %) and the eastern U.S. (2.0 %), where the high ambient O3 causes strong O3-vegetation interactions. With likelihood of increasing fire risks in a warming climate, fires may promote surface O3 through both direct emissions and indirect chemistry-vegetation feedbacks. Such indirect enhancement will cause additional threats to public health and ecosystem productivity.

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“…Visibility has been used as a proxy for PM2.5 (Huang et al, 2009) and to estimate PM2.5 (Liu et al, 2017;Li et al, 2020;Singh et al, 2020). Singh et al (2020) analyzed the air quality in East Africa from 1974 to 2018 using visibility data.…”

Section: Introductionmentioning

confidence: 99%

PM_2.5 concentrations based on near-surface visibility at 4011 sites in the Northern Hemisphere from 1959 to 2022

Hao,

Wang,

et al. 2024

Preprint

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Abstract. Long-term PM2.5 data are needed to study the atmospheric environment, human health, and climate change. PM2.5 measurements are sparsely distributed and of short duration. In this study, daily PM2.5 concentrations are estimated from 1959 to 2022 using a machine learning method at 4011 terrestrial sites in the Northern Hemisphere based on hourly atmospheric visibility data, which are extracted from the Meteorological Terminal Aviation Routine Weather Report (METAR). PM2.5 monitoring is the target of machine learning, and atmospheric visibility and other related variables are the inputs. The training results show that the slope between the estimated PM2.5 concentration and the monitored PM2.5 concentration is 0.946± 0.0002 within the 95 % confidence interval (CI), the coefficient of determination (R2) is 0.95, the root mean square error (RMSE) is 7.0 μg/m3, and the mean absolute error (MAE) is 3.1 μg/m3. The test results show that the slope between the predicted PM2.5 concentration and the monitored PM2.5 concentration is 0.862 ± 0.0010 within a 95 % CI, the R2 is 0.80, the RMSE is 13.5 μg/m3, and the MAE is 6.9 μg/m3. The multiyear mean PM2.5 concentrations from 1959 to 2022 in the United States, Canada, Europe, China, and India are 11.2 μg/m3, 8.2 μg/m3, 20.1 μg/m3, 51.3 μg/m3 and 88.6 μg/m3, respectively. PM2.5 is low and continues to decrease from 1959 to 2022. PM2.5 in the United States increases slightly at a rate of 0.38 μg/m3/decade from 1959 to 1990 and decreases at a rate of -1.32 μg/m3/decade from 1991 to 2022. Trends in Europe are positive (5.69 μg/m3/decade) from 1959 to 1972 and negative (-1.91 μg/m3/decade) from 1973 to 2022. Trends in China and India are increasing (3.04 and 3.35 μg/m3/decade, respectively) from 1959 to 2012 and decreasing (-38.82 and -42.84 μg/m3/decade, respectively) from 2013 to 2022. The dataset is available at National Tibetan Plateau / Third Pole Environment Data Center (https://doi.org/10.11888/Atmos.tpdc.301127) (Hao et al., 2024).

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Retrieval of surface PM2.5 mass concentrations over North China using visibility measurements and GEOS-Chem simulations

Cited by 15 publications

References 50 publications

Indirect contributions of global fires to surface ozone through ozone–vegetation feedback

Indirect contributions of global fires to surface ozone through ozone–vegetation feedback

Indirect contributions of global fires to surface ozone through ozone-vegetation feedback

PM_2.5 concentrations based on near-surface visibility at 4011 sites in the Northern Hemisphere from 1959 to 2022

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Retrieval of surface PM2.5 mass concentrations over North China using visibility measurements and GEOS-Chem simulations

Cited by 15 publications

References 50 publications

Indirect contributions of global fires to surface ozone through ozone–vegetation feedback

Indirect contributions of global fires to surface ozone through ozone–vegetation feedback

Indirect contributions of global fires to surface ozone through ozone-vegetation feedback

PM2.5 concentrations based on near-surface visibility at 4011 sites in the Northern Hemisphere from 1959 to 2022

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Product

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PM_2.5 concentrations based on near-surface visibility at 4011 sites in the Northern Hemisphere from 1959 to 2022