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Sökning: (L773:1873 2844 OR L773:1352 2310) srt2:(2020-2024) > (2021)

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1.
  • Ahn, Seo H., et al. (författare)
  • Relationship between cloud condensation nuclei (CCN) concentration and aerosol optical depth in the Arctic region
  • 2021
  • Ingår i: Atmospheric Environment. - : Elsevier BV. - 1352-2310 .- 1873-2844. ; 267
  • Tidskriftsartikel (refereegranskat)abstract
    • To determine the direct and indirect effects of aerosols on climate, it is important to know the spatial and temporal variations in cloud condensation nuclei (CCN) concentrations. Although many types of CCN measurements are available, extensive CCN measurements are challenging because of the complexity and high operating cost, especially in remote areas. As aerosol optical depth (AOD) can be readily observed by remote sensing, many attempts have been made to estimate CCN concentrations from AOD. In this study, the CCN-AOD relationship is parameterized based on CCN ground measurements from the Zeppelin Observatory (78.91 degrees N, 11.89 degrees E, 474 m asl) in the Arctic region. The AOD measurements were obtained from the Ny-Alesund site (78.923 degrees N, 11.928 degrees E) and Modern-Era Retrospective Analysis for Research and Applications, Version 2 reanalysis. Our results show a CCN-AOD correlation with a coefficient of determination R-2 of 0.59. Three additional estimation models for CCN were presented based on the following data: (i) in situ aerosol chemical composition, (ii) in situ aerosol optical properties, and (iii) chemical composition of AOD obtained from reanalysis data. The results from the model using in situ aerosol optical properties reproduced the observed CCN concentration most efficiently, suggesting that the contribution of BC to CCN concentration should be considered along with that of sulfate.
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2.
  • Li, Chaoliu, et al. (författare)
  • Quantification and implication of measurement bias of ambient atmospheric BC concentration
  • 2021
  • Ingår i: Atmospheric Environment. - : Elsevier BV. - 1352-2310 .- 1873-2844. ; 249
  • Tidskriftsartikel (refereegranskat)abstract
    • Black carbon (BC) aerosols have severe impacts on climate and health. Most atmospheric BC loadings are now predominantly reported for the PM2.5 size cut-off. Based on 39 published set of ambient BC concentrations from around the world where PM2.5 and PM10 were collected in parallel, we demonstrate that BC in PM2.5 was only around 80% of that in PM10. The implication is that around 20% of BC in the global ambient atmosphere is ignored with the now-legacy PM2.5 sampling approach. Correspondingly, BC of freshly emitted particles from combustion activities is dominantly reported in terms of PM2.5, and thus inflicting a bias in the total BC emission inventories. A consequence is that ambient BC is underpredicted when derived from models based on (PM2.5) emission inventories. This consideration contributes to reconcile existing systematic offset between model predictions and observation-based estimates of climate-relevant effects of anthropogenic BC aerosols. We propose that total ambient BC concentration should be considered rather than the PM2.5 portion to reduce the uncertainties in estimates of BC effects on the climate.
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  • Resultat 1-2 av 2
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Ström, Johan (1)
Aas, W. (1)
Krejci, Radovan (1)
Gustafsson, Örjan (1)
Ahn, Seo H. (1)
Yoon, Y. J. (1)
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Choi, T. J. (1)
Lee, J. Y. (1)
Kim, Y. P. (1)
Lee, B. Y. (1)
Ritter, C. (1)
Tunved, Peter (1)
Jung, Chang H. (1)
Zhang, Chao (1)
Kang, Shichang (1)
Li, Chaoliu (1)
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Stockholms universitet (2)
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