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| Titel |
Total aerosol effect: radiative forcing or radiative flux perturbation? |
| VerfasserIn |
Ulrike Lohmann, Leon Rotstayn, Trude Storelvmo, Andy Jones, Surabi Menon, Johannes Quaas, Annica Ekman, Dorothy Koch, Reto Ruedy |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250038460
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| Zusammenfassung |
| Uncertainties in aerosol radiative forcings, especially those associated with clouds, contribute
to a large extent to uncertainties in the total anthropogenic forcing. The interaction of aerosols
with clouds and radiation introduces feedbacks which can affect the rate of rain formation. In
former assessments of aerosol radiative forcings, these effects have not been quantified. Also,
with global aerosol-climate models simulating interactively aerosols and cloud microphysical
properties, a quantification of the aerosol forcings in the traditional way is difficult to
properly define. Here we argue that fast feedbacks should be included because they act
quickly compared with the time scale of global warming. We show that for different forcing
agents (aerosols and greenhouse gases) the radiative forcings as traditionally defined
agree rather well with estimates from a method, here referred to as radiative flux
perturbations (RFP), that takes these fast feedbacks and interactions into account. Based on
our results, we recommend RFP as a valid option to compare different forcing
agents, and to compare the effects of particular forcing agents in different models. |
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