Sensitivity studies of different aerosol indirect effects in mixed-phase clouds

By Ulrike Lohmann, C. Hoose. 2009

173 citations recorded by the source corpus.

Abstract. Aerosols affect the climate system by changing cloud characteristics. Using the global climate model ECHAM5-HAM, we investigate different aerosol effects on mixed-phase clouds: The glaciation effect, which refers to a more frequent glaciation due to anthropogenic aerosols, versus the de-activation effect, which suggests that ice nuclei become less effective because of an anthropogenic sulfate coating. The glaciation effect can partly offset the indirect aerosol effect on warm clouds and thus causes the total anthropogenic aerosol effect to be smaller. It is investigated by varying the parameterization for the Bergeron-Findeisen process and the threshold coating thickness of sulfate (SO4-crit), which is required to convert an externally mixed aerosol particle into an internally mixed particle. Differences in the net radiation at the top-of-the-atmosphere due to anthropogenic aerosols between the different sensitivity studies amount up to 0.5 W m−2. This suggests that the investigated mixed-phase processes have a major effect on the total anthropogenic aerosol effect.

Subfields: Atmospheric Science, Global and Planetary Change

View Paper: https://www.semanticscholar.org/paper/ce4bfd563b17a3d5f2705945145dc58299c32091

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Citations in the corpus

Intercomparison of the cloud water phase among global climate models (2014, methodology): “Contact and immersion freezing are the heterogeneous ice nucleation mechanisms included in the model: Immersion ice nuclei include internally mixed dust and BC aerosols, and contact ice nuclei include externally mixed dust particles [Lohmann and Diehl, 2006; Lohmann et al., 2007; Lohmann and Hoose, ”
Overview of Ice Nucleating Particles (2017, background): “Such schemes are tested against ﬁeld observations (e.g., Klein et al. 2009; Kuebbeler et al. 2014; Lohmann and Hoose 2009) or satellite observations (e.g., Kay et al. 2012) and do provide superior simulations of cloud types than previous model versions (Kay et al. 2012).”
A Classical-Theory-Based Parameterization of Heterogeneous Ice Nucleation by Mineral Dust, Soot, and Biological Particles in a Global Climate Model (2010, background): “The different aerosol indirect effects (cloud albedo effect and cloud lifetime effect in warm clouds and the glaciation and deactivation indirect effect in mixed-phase clouds; Lohmann and Hoose 2009) counteract each other.”
Climate impacts of ice nucleation (2012, background): “, 2006; Barahona and Nenes, 2009], and global models are incorporating them with comprehensive aerosol schemes [Lohmann and Hoose, 2009;Gettelman et al., 2010] there are limited estimates of the global impact of ice nucleation on climate.”
Total aerosol effect: radiative forcing or radiative flux perturbation? (2009, background): “3 Cloud albedo, cloud lifetime, direct effect and aerosol effects on mixed-phase clouds Lohmann and Diehl(2006), Jacobson(2006), Storelvmo et al.(2008a), Hoose et al.(2008b), Storelvmo et al.(2008b), Koch et al.(2009), Lohmann and Hoose(2009) A2.”
Technical Note: On the use of nudging for aerosol–climate model intercomparison studies (2014, background): “Because the meteorological features are strongly constrained, nudging eliminates one source of model variability, reduces error and uncer20 tainty in other terms, and thus facilitates detection of signatures of changes in process representations (parameterizations) in simulations that might otherwis”
A single parameter representation of hygroscopic growth and cloud condensation nucleus activity – Part 3: Including surfactant partitioning (2012, unknown): “, 2010) and thus it can be used as vehicle to parameterize the effect of these processes on CCN activation in models (Lohmann and Hoose, 2009).”
The ice nucleation ability of one of the most abundant types of fungal spores found in the atmosphere (2010, unknown): “Heterogeneous nucleation involves solid or partially solid particles, called ice nuclei (IN), that have the potential to modify climate by changing the formation conditions and properties of ice clouds and mixed-phase clouds (Baker and Peter, 2008; Hegg and Baker, 2009; Lohmann and Hoose, 2009).”
Mixed-Phase Clouds: Progress and Challenges (2017, methodology): “(5-8)] and switch to saturation with respect to ice when uz , uz* (Storelvmo et al. 2008b; Lohmann and Hoose 2009).”
Aerosol-cloud-precipitation effects over Germany as simulated by a convective-scale numerical weather prediction model (2011, background): “Glaciation indirect effect: More IN lead to a more efficient glaciation of clouds and an increased precipitation efficiency (e.g.Lohmann, 2002; Lohmann and Hoose, 2009).”