Simulation of aerosol deposition flux over the Arabian Peninsula with CHIMERE-2017: Sensitivity to different dry deposition schemes

Beegum, S. Naseema; Tuomiranta, Arttu; Gherboudj, Imen; Flemming, Johannes; Ghedira, Hosni

doi:10.1016/j.atmosres.2020.104949

Cited by 4 publications

(3 citation statements)

References 79 publications

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“…The underestimation of the coarse fraction of PM can stem from either too low emissions of coarse particles in the HTAP anthropogenic emissions inventory, or excess dry deposition as (PM 10 -PM 2.5 ) are substantially more deposited than PM 2.5 due to their greater mass. The latter point is sensitive to the choice of the deposition scheme, sometimes resulting in significantly different fluxes, e.g., [49]. However, emissions of aerosols by fires are usually mostly found in fine mode as is consistently shown both by the simulations and measurements: when the fire event starts, the PM 2.5 /PM 10 ratio increases in both the model and observations, to around 0.8 and 0.6, respectively, (not shown here).…”

Section: In Santiagomentioning

confidence: 99%

The 2017 Mega-Fires in Central Chile: Impacts on Regional Atmospheric Composition and Meteorology Assessed from Satellite Data and Chemistry-Transport Modeling

2021

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In January 2017, historic forest fires occurred in south-central Chile. Although their causes and consequences on health and ecosystems were studied, little is known about their atmospheric effects. Based on chemistry-transport modeling with WRF-CHIMERE, the impact of the 2017 Chilean mega-fires on regional atmospheric composition, and the associated meteorological feedback, are investigated. Fire emissions are found to increase pollutants surface concentration in the capital city, Santiago, by +150% (+30 µg/m3) for PM2.5 and +50% (+200 ppb) for CO on average during the event. Satellite observations show an intense plume extending over 2000 km, well reproduced by the simulations, with Aerosol Optical Depth at 550 nm as high as 4 on average during the days of fire activity, as well as dense columns of CO and O3. In addition to affecting atmospheric composition, meteorology is also modified through aerosol direct and indirect effects, with a decrease in surface radiation by up to 100 W/m2 on average, leading to reductions in surface temperatures by 1 K and mixing layer heights over land by 100 m, and a significant increase in cloud optical depth along the plume. Large deposition fluxes of pollutants over land, the Pacific ocean and the Andes cordillera are found, signaling potential damages to remote ecosystems.

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Section: In Santiagomentioning

confidence: 99%

The 2017 Mega-Fires in Central Chile: Impacts on Regional Atmospheric Composition and Meteorology Assessed from Satellite Data and Chemistry-Transport Modeling

2021

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“…Conducting multiple simulations, using different deposition parameterizations, could help estimate the variability of our results related to this choice. However, Beegum et al (2020) for example showed that the compared performance of both deposition schemes available in CHIMERE depends on the season and location considered. Thus, including a second set of simulations with the other deposition scheme would not result in more confident results.…”

Section: Discussionmentioning

confidence: 99%

Meteorological export and deposition fluxes of black carbon on glaciers of the central Chilean Andes

Lapere

Huneeus²,

Mailler³

et al. 2023

Atmos. Chem. Phys.

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Abstract. Air pollution in the central zone of Chile is not only a public health concern but also threatens water resources and climate, in connection with the transport and deposition of black carbon (BC) from urban centers onto the glaciers of the Andes. Chemistry-transport simulations reveal a seasonal dichotomy in the flux and latitudinal pattern of BC deposition on glaciers of the central Chilean Andes. The average deposition flux of BC on glaciers between 30 and 37∘ S is 4 times larger in winter, affecting mostly low-elevation glaciers, whereas the smaller summertime flux affects glaciers evenly, irrespective of their elevation. The contribution of emissions from the city of Santiago is dominant in summertime with more than 50 % along the Andes but minor in wintertime with less than 20 % even close to the capital city. Transport at larger scales and more local sources likely account for the remaining flux. The superimposition of synoptic-scale circulation and local mountain-valley circulation along the Andes drives the differences between summertime and wintertime deposition fluxes and generates a greater meteorological export potential during summer months. Future emissions and climate projections suggest that under the RCP8.5 scenario the gap between summertime and wintertime BC export and deposition flux could decrease, thereby pointing to summertime emission control gaining relevance. The chemistry-transport modeling approach for BC deposition on the Andes sheds light on the importance of the often disregarded summertime emissions on the radiative balance of its glaciers, particularly in the vicinity of Santiago.

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“…Another dry deposition scheme is available in CHIMERE based on Wesely (1989). The compared performance of Zhang et al (2001) and Wesely (1989) deposition schemes in CHIMERE was assessed over the Arabian Peninsula in Beegum et al (2020), revealing that Zhang et al (2001) matched observations better for this region, despite a seasonal variability in performance. The choice to use only one scheme rather than performing a sensitivity analysis with both schemes is discussed in Section 4.…”

Section: Modeling Setupmentioning

confidence: 99%

Meteorological export and deposition fluxes of Black Carbon on glaciers of the central Chilean Andes

Lapere

Huneeus

Mailler

et al. 2022

Preprint

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Abstract. Air pollution in the central zone of Chile not only is a public health concern, but also threatens water resources and climate, in connection with the transport and deposition of black carbon (BC) from urban centers onto the glaciers of the Andes Cordillera. Chemistry-transport simulations reveal a seasonal dichotomy in the flux and latitudinal pattern of BC deposition on glaciers of the central Chilean Andes. The average deposition flux of BC on glaciers between 30° S and 37° S is 4 times larger in winter, affecting mostly low elevation glaciers, whereas the smaller summertime flux affects glaciers evenly, irrespective of their elevation. The contribution of emissions from Santiago city is dominant in summertime with more than 50 % along the Andes, but minor in wintertime with less than 20 % even close to the capital city. Transport at larger scales and more local sources likely account for the remaining flux. The superimposition of synoptic-scale circulation and local mountain-valley circulation along the Andes cordillera drives the differences between summertime and wintertime deposition fluxes and generates a greater meteorological export potential during summer months. Future emissions and climate projections suggest that under the RCP8.5 scenario the gap between summertime and wintertime BC export and deposition flux could decrease, thereby pointing to summertime emission control gaining relevance. The chemistry-transport modeling approach for BC deposition on the Andes sheds light on the importance of the often disregarded summertime emissions on the radiative balance of its glaciers, particularly in the vicinity of Santiago.

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Simulation of aerosol deposition flux over the Arabian Peninsula with CHIMERE-2017: Sensitivity to different dry deposition schemes

Cited by 4 publications

References 79 publications

The 2017 Mega-Fires in Central Chile: Impacts on Regional Atmospheric Composition and Meteorology Assessed from Satellite Data and Chemistry-Transport Modeling

The 2017 Mega-Fires in Central Chile: Impacts on Regional Atmospheric Composition and Meteorology Assessed from Satellite Data and Chemistry-Transport Modeling

Meteorological export and deposition fluxes of black carbon on glaciers of the central Chilean Andes

Meteorological export and deposition fluxes of Black Carbon on glaciers of the central Chilean Andes

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