Recent decline in carbon monoxide levels observed at an urban site in Ahmedabad, India DOI
Naveen Chandra, Shyam Lal,

S. Venkataramani

et al.

Environmental Science and Pollution Research, Journal Year: 2024, Volume and Issue: 31(27), P. 39678 - 39689

Published: June 3, 2024

Language: Английский

Detailed analysis of air pollution in the Canadian prairie region: A step toward net-zero emission DOI
Amir Ghahremanlou, Davoud Ghahremanlou

The Science of The Total Environment, Journal Year: 2025, Volume and Issue: 963, P. 178492 - 178492

Published: Jan. 15, 2025

Language: Английский

Citations

1
Tropical upper-tropospheric trends in ozone and carbon monoxide (2005–2020): observational and model results DOI Creative Commons

Lucien Froidevaux,

Douglas E. Kinnison, Benjamin Gaubert

et al.

Atmospheric chemistry and physics, Journal Year: 2025, Volume and Issue: 25(1), P. 597 - 624

Published: Jan. 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.

Language: Английский

Citations

0
Spatial and seasonal variations and trends in carbon monoxide over China during 2013–2022 DOI Creative Commons

Yanlun Xie,

Han Han, Jane Liu

et al.

Atmospheric Environment, Journal Year: 2025, Volume and Issue: unknown, P. 121163 - 121163

Published: March 1, 2025

Language: Английский

Citations

0
Quantification of uncertainty in short-term tropospheric column density risks for a wide range of carbon monoxide DOI
Yufeng Chi, Yingying Wu, Kai Wang

et al.

Journal of Environmental Management, Journal Year: 2024, Volume and Issue: 370, P. 122725 - 122725

Published: Oct. 2, 2024

Language: Английский

Citations

2
Tropical upper tropospheric trends in ozone and carbon monoxide (2005–2020): observational and model results DOI Creative Commons

Lucien Froidevaux,

Douglas E. Kinnison, Benjamin Gaubert

et al.

Published: March 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.

Language: Английский

Citations

1
Comment on egusphere-2024-525 DOI Creative Commons
L. Froidevaux, Douglas E. Kinnison, Benjamin Gaubert

et al.

Published: April 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.

Language: Английский

Citations

0
Comment on egusphere-2024-525 DOI Creative Commons

Yann Cohen

Published: May 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.

Language: Английский

Citations

0
Recent decline in carbon monoxide levels observed at an urban site in Ahmedabad, India DOI
Naveen Chandra, Shyam Lal,

S. Venkataramani

et al.

Environmental Science and Pollution Research, Journal Year: 2024, Volume and Issue: 31(27), P. 39678 - 39689

Published: June 3, 2024

Language: Английский

Citations

0