Detailed analysis of air pollution in the Canadian prairie region: A step toward net-zero emission

The Science of The Total Environment, Год журнала: 2025, Номер 963, С. 178492 - 178492

Опубликована: Янв. 15, 2025

Язык: Английский

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Tropical upper-tropospheric trends in ozone and carbon monoxide (2005–2020): observational and model results

Atmospheric chemistry and physics, Год журнала: 2025, Номер 25(1), С. 597 - 624

Опубликована: Янв. 17, 2025

Abstract. We analyze tropical ozone (O3) and carbon monoxide (CO) distributions in the upper troposphere (UT) for 2005–2020 using Aura Microwave Limb Sounder (MLS) observations simulations from Whole Atmosphere Community Climate Model (WACCM) two variants of with Chemistry (CAM-chem), each variant different anthropogenic CO emissions. Trends variability diagnostics are obtained multiple linear regression. The MLS zonal mean O3 UT trend 20° S–20° N is +0.39 ± 0.28 % yr−1; WACCM CAM-chem yield similar trends, although result somewhat smaller. Our analyses gridded data positive trends (up to 1.4 yr−1) over Indonesia east that region, as well Africa Atlantic. These mapped generally captured by but a more muted way. find broad similarities (and some differences) between corresponding tropospheric column ozone. −0.25 0.30 yr−1, while 0.0 0.14 yr−1 when emissions taken Emissions Data System (CEDS) version 2. simulation driven CAMS-GLOB-ANTv5 yields 0.22 0.19 contrast slightly negative trend. Previously published total have shown trends. composition results contribute continuing international assessments evolution.

Язык: Английский

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Spatial and seasonal variations and trends in carbon monoxide over China during 2013–2022

Atmospheric Environment, Год журнала: 2025, Номер unknown, С. 121163 - 121163

Опубликована: Март 1, 2025

Язык: Английский

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Quantification of uncertainty in short-term tropospheric column density risks for a wide range of carbon monoxide

Journal of Environmental Management, Год журнала: 2024, Номер 370, С. 122725 - 122725

Опубликована: Окт. 2, 2024

Язык: Английский

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Tropical upper tropospheric trends in ozone and carbon monoxide (2005–2020): observational and model results

Опубликована: Март 11, 2024

Abstract. We analyze tropical ozone (O3) and carbon monoxide (CO) distributions in the upper troposphere (UT) their temporal changes for 2005–2020 using Aura Microwave Limb Sounder (MLS) observations chemistry climate models. The models are Whole Atmosphere Community Climate Model (WACCM6) two variants of with Chemistry (CAM-chem), each variant different anthropogenic emissions. Upper tropospheric trends variability diagnostics obtained from multiple linear regression analyses. compare model MLS annual climatologies, focusing on 147 215 hPa pressure levels; climatological values generally fall within 10–20 % other, both positive negative differences O3, underestimating observed CO. In northern hemisphere tropics, we find significantly poorer fits to phasing CO seasonal at than hPa. This discrepancy is much smaller comparison modeled Measurements Pollution Troposphere (MOPITT) V9J columns. also that sensitivity UT El Niño / Southern Oscillation (ENSO) all longitudes, contrast dipolar longitudinal structure exists O3 ENSO sensitivity. has a zonal mean trend 20° S–20° N +0.39 ± 0.28 yr-1; CAM-chem WACCM have similar trends, though somewhat smaller. Our analyses specific latitude/longitude bins yield up 1.4 yr-1 over Indonesia East region, as well Africa Atlantic. broad similarities between mapped MLS-derived corresponding column ozone. Positive captured by models, although more muted way. There room improvements trends. Indeed, -0.25 0.30 yr-1, whereas near zero (0.0 0.14 yr-1) when emissions used taken Emissions Data System (CEDS) version 2. non-CEDS yields 0.22 0.19 throughout tropics. agree (but tend be magnitude than) previously published total Decreasing biomass burning sources been suggested main causes decreases, significant regional emission variations exist.

Язык: Английский

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Comment on egusphere-2024-525

Опубликована: Май 17, 2024

Abstract. We analyze tropical ozone (O₃) and carbon monoxide (CO) distributions in the upper troposphere (UT) their temporal changes for 2005–2020 using Aura Microwave Limb Sounder (MLS) observations chemistry climate models. The models are Whole Atmosphere Community Climate Model (WACCM6) two variants of with Chemistry (CAM-chem), each variant different anthropogenic emissions. Upper tropospheric trends variability diagnostics obtained from multiple linear regression analyses. compare model MLS annual climatologies, focusing on 147 215 hPa pressure levels; climatological values generally fall within 10–20 % other, both positive negative differences O₃, underestimating observed CO. In northern hemisphere tropics, we find significantly poorer fits to phasing CO seasonal at than hPa. This discrepancy is much smaller comparison modeled Measurements Pollution Troposphere (MOPITT) V9J columns. also that sensitivity UT El Niño / Southern Oscillation (ENSO) all longitudes, contrast dipolar longitudinal structure exists O₃ ENSO sensitivity. has a zonal mean trend 20° S–20° N +0.39 ± 0.28 yr^-1; CAM-chem WACCM have similar trends, though somewhat smaller. Our analyses specific latitude/longitude bins yield up 1.4 yr^-1 over Indonesia East region, as well Africa Atlantic. broad similarities between mapped MLS-derived corresponding column ozone. Positive captured by models, although more muted way. There room improvements trends. Indeed, -0.25 0.30 yr^-1, whereas near zero (0.0 0.14 yr^-1) when emissions used taken Emissions Data System (CEDS) version 2. non-CEDS yields 0.22 0.19 throughout tropics. agree (but tend be magnitude than) previously published total Decreasing biomass burning sources been suggested main causes decreases, significant regional emission variations exist.

Язык: Английский

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Comment on egusphere-2024-525

Опубликована: Апрель 18, 2024

Abstract. We analyze tropical ozone (O₃) and carbon monoxide (CO) distributions in the upper troposphere (UT) their temporal changes for 2005–2020 using Aura Microwave Limb Sounder (MLS) observations chemistry climate models. The models are Whole Atmosphere Community Climate Model (WACCM6) two variants of with Chemistry (CAM-chem), each variant different anthropogenic emissions. Upper tropospheric trends variability diagnostics obtained from multiple linear regression analyses. compare model MLS annual climatologies, focusing on 147 215 hPa pressure levels; climatological values generally fall within 10–20 % other, both positive negative differences O₃, underestimating observed CO. In northern hemisphere tropics, we find significantly poorer fits to phasing CO seasonal at than hPa. This discrepancy is much smaller comparison modeled Measurements Pollution Troposphere (MOPITT) V9J columns. also that sensitivity UT El Niño / Southern Oscillation (ENSO) all longitudes, contrast dipolar longitudinal structure exists O₃ ENSO sensitivity. has a zonal mean trend 20° S–20° N +0.39 ± 0.28 yr^-1; CAM-chem WACCM have similar trends, though somewhat smaller. Our analyses specific latitude/longitude bins yield up 1.4 yr^-1 over Indonesia East region, as well Africa Atlantic. broad similarities between mapped MLS-derived corresponding column ozone. Positive captured by models, although more muted way. There room improvements trends. Indeed, -0.25 0.30 yr^-1, whereas near zero (0.0 0.14 yr^-1) when emissions used taken Emissions Data System (CEDS) version 2. non-CEDS yields 0.22 0.19 throughout tropics. agree (but tend be magnitude than) previously published total Decreasing biomass burning sources been suggested main causes decreases, significant regional emission variations exist.

Язык: Английский

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Recent decline in carbon monoxide levels observed at an urban site in Ahmedabad, India

Environmental Science and Pollution Research, Год журнала: 2024, Номер 31(27), С. 39678 - 39689

Опубликована: Июнь 3, 2024

Язык: Английский

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