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Assessment of simulated aerosol effective radiative forcings in the terrestrial spectrum

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Title: Assessment of simulated aerosol effective radiative forcings in the terrestrial spectrum
Authors: Heyn, I
Block, K
Mülmenstädt, J
Gryspeerdt, ERI
Kühne, P
Salzmann, M
Quaas, J
Item Type: Journal Article
Abstract: In its fifth assessment report (AR5), the Intergovernmental Panel on Climate Change provides a best estimate of the effective radiative forcing (ERF) due to anthropogenic aerosol at −0.9 W m−2. This value is considerably weaker than the estimate of −1.2 W m−2 in AR4. A part of the difference can be explained by an offset of +0.2 W m−2 which AR5 added to all published estimates that only considered the solar spectrum, in order to account for adjustments in the terrestrial spectrum. We find that, in the CMIP5 multimodel median, the ERF in the terrestrial spectrum is small, unless microphysical effects on ice- and mixed-phase clouds are parameterized. In the latter case it is large but accompanied by a very strong ERF in the solar spectrum. The total adjustments can be separated into microphysical adjustments (aerosol “effects”) and thermodynamic adjustments. Using a kernel technique, we quantify the latter and find that the rapid thermodynamic adjustments of water vapor and temperature profiles are small. Observation-based constraints on these model results are urgently needed.
Issue Date: 27-Jan-2017
Date of Acceptance: 4-Jan-2017
URI: http://hdl.handle.net/10044/1/43885
DOI: https://dx.doi.org/10.1002/2016GL071975
ISSN: 1944-8007
Publisher: American Geophysical Union (AGU)
Start Page: 1001
End Page: 1007
Journal / Book Title: Geophysical Research Letters
Volume: 44
Issue: 2
Copyright Statement: © 2017. American Geophysical Union. All Rights Reserved.
Keywords: Science & Technology
Physical Sciences
Geosciences, Multidisciplinary
Geology
aerosol effective radiative forcing
cloud adjustments
thermodynamic adjustments
GLOBAL CLIMATE MODEL
MIXED-PHASE CLOUDS
CONVECTIVE CLOUDS
ANTHROPOGENIC AEROSOLS
STRATIFORM CLOUDS
SATELLITE DATA
SENSITIVITY
MICROPHYSICS
POLLUTION
IMPACTS
Meteorology & Atmospheric Sciences
MD Multidisciplinary
Publication Status: Published
Appears in Collections:Space and Atmospheric Physics
Physics
Faculty of Natural Sciences



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