Assessment of simulated aerosol effective radiative forcings in the terrestrial spectrum
| Autor: | Philipp Kühne, Johannes Mülmenstädt, Edward Gryspeerdt, Johannes Quaas, Marc Salzmann, Irene Heyn, Karoline Block |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
IMPACTS
Pollution 010504 meteorology & atmospheric sciences media_common.quotation_subject STRATIFORM CLOUDS 010502 geochemistry & geophysics Atmospheric sciences 01 natural sciences POLLUTION Satellite data MD Multidisciplinary GLOBAL CLIMATE MODEL Radiative transfer Meteorology & Atmospheric Sciences thermodynamic adjustments Sensitivity (control systems) Geosciences Multidisciplinary 0105 earth and related environmental sciences media_common cloud adjustments aerosol effective radiative forcing Science & Technology Microphysics Geology MIXED-PHASE CLOUDS Aerosol CONVECTIVE CLOUDS Geophysics ANTHROPOGENIC AEROSOLS General Circulation Model Physical Sciences SATELLITE DATA General Earth and Planetary Sciences Environmental science MICROPHYSICS SENSITIVITY |
| Zdroj: | Geophysical Research Letters. 44:1001-1007 |
| ISSN: | 1944-8007 0094-8276 |
| DOI: | 10.1002/2016gl071975 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text