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  Numerical simulation and evaluation of global ultrafine particle concentrations

Kohl, M., Chowdhury, S., Sharma, D., Cheng, Y., Tripathi, S. N., Sebastian, M., et al. (2023). Numerical simulation and evaluation of global ultrafine particle concentrations. EGU General Assembly 2023, Vienna, Austria, 24–28 Apr 2023, Abstract EGU23-12650. doi:10.5194/egusphere-egu23-12650.

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 Creators:
Kohl, Matthias1, Author           
Chowdhury, Sourangsu, Author
Sharma, Disha1, Author           
Cheng, Yafang2, Author           
Tripathi, Sachchida Nand, Author
Sebastian, Mathew, Author
Pandithurai, Govindan, Author
Wang, Hongli, Author
Lelieveld, Jos1, Author           
Pozzer, Andrea1, Author           
Affiliations:
1Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826285              
2Multiphase Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826290              

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 Abstract: Ultrafine particles (UFP), i.e. particles with an aerodynamic diameter below 100 nm, have a significant impact on public health and the hydrological cycle. Recent studies showed that their ability to penetrate more deeply into the lungs and potentially into the blood stream may cause an increased incidence of cardiovascular and cerebrovascular diseases. Additionally, UFPs significantly contribute to cloud condensation nuclei concentrations. However, knowledge on global distributions of UFPs is scarce.

We present a global simulation of UFP concentrations using the ECHAM/MESSy Atmospheric Chemistry Model (EMAC), including tropospheric and middle-atmospheric processes, and the modal aerosol microphysics submodel GMXe. Due to the high sensitivity of UFP concentrations to the size distribution of emitted particles, we derived emission median diameter for primary emissions from various sectors and species based on existing literature. We show the importance of primary emissions and nucleation on UFP concentrations as well as their composition, seasonality and vertical distributions.

Model results were evaluated over Europe, the United States, India and China, using particle size distribution and particle number concentration measurements from available datasets and the literature. We obtain reasonable agreement between the model results and observations. However, the highest values of observed, street-level UFP concentrations are systematically underestimated, whereas in rural environments close to urban areas they are generally overestimated by the model. As the relatively coarse global model does not resolve concentration gradients in urban centres and local UFP hotspots, high-resolution data of anthropogenic emissions is used to account for such differences in each model grid box. This downscaling further improves the agreement with observations, decreasing the root mean squared logarithmic error and removing discrepancies associated with air quality and population density gradients within the model grid boxes.

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Language(s): eng - English
 Dates: 2023-02-26
 Publication Status: Published online
 Pages: -
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 Rev. Type: No review
 Identifiers: DOI: 10.5194/egusphere-egu23-12650
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Title: EGU General Assembly 2023
Place of Event: Vienna, Austria
Start-/End Date: 2023-04-24 - 2023-04-28

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Title: EGU General Assembly 2023, Vienna, Austria, 24–28 Apr 2023,
Source Genre: Journal
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Pages: - Volume / Issue: - Sequence Number: Abstract EGU23-12650 Start / End Page: - Identifier: -