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- Title
Global organic and inorganic aerosol hygroscopicity and its effect on radiative forcing.
- Authors
Pöhlker, Mira L.; Pöhlker, Christopher; Quaas, Johannes; Mülmenstädt, Johannes; Pozzer, Andrea; Andreae, Meinrat O.; Artaxo, Paulo; Block, Karoline; Coe, Hugh; Ervens, Barbara; Gallimore, Peter; Gaston, Cassandra J.; Gunthe, Sachin S.; Henning, Silvia; Herrmann, Hartmut; Krüger, Ovid O.; McFiggans, Gordon; Poulain, Laurent; Raj, Subha S.; Reyes-Villegas, Ernesto
- Abstract
The climate effects of atmospheric aerosol particles serving as cloud condensation nuclei (CCN) depend on chemical composition and hygroscopicity, which are highly variable on spatial and temporal scales. Here we present global CCN measurements, covering diverse environments from pristine to highly polluted conditions. We show that the effective aerosol hygroscopicity, κ, can be derived accurately from the fine aerosol mass fractions of organic particulate matter (ϵorg) and inorganic ions (ϵinorg) through a linear combination, κ = ϵorg ⋅ κorg + ϵinorg ⋅ κinorg. In spite of the chemical complexity of organic matter, its hygroscopicity is well captured and represented by a global average value of κorg = 0.12 ± 0.02 with κinorg = 0.63 ± 0.01 as the corresponding value for inorganic ions. By showing that the sensitivity of global climate forcing to changes in κorg and κinorg is small, we constrain a critically important aspect of global climate modelling. The effective hygroscopicity of organic matter and inorganic ions in atmospheric aerosols can be efficiently and accurately parameterized by global average values to constrain a critically important aspect in climate and Earth system models
- Subjects
RADIATIVE forcing; CLIMATE change models; ATMOSPHERIC aerosols; CLOUD condensation nuclei; AEROSOLS; PARTICULATE matter
- Publication
Nature Communications, 2023, Vol 14, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-023-41695-8