Please use this identifier to cite or link to this item: https://oa.tib.eu/renate/handle/123456789/637
Files in This Item:
File SizeFormat 
cp-10-1333-2014.pdf2,88 MBAdobe PDFView/Open
Title: Sensitivity simulations with direct shortwave radiative forcing by aeolian dust during glacial cycles
Authors: Bauer, E.Ganopolski, A.
Publishers version: https://doi.org/10.5194/cp-10-1333-2014
URI: https://doi.org/10.34657/1263
https://oa.tib.eu/renate/handle/123456789/637
Issue Date: 2014
Published in: Climate of the Past, Volume 10, Issue 4, Page 1333-1348
Publisher: München : European Geopyhsical Union
Abstract: Possible feedback effects between aeolian dust, climate and ice sheets are studied for the first time with an Earth system model of intermediate complexity over the late Pleistocene period. Correlations between climate and dust deposition records suggest that aeolian dust potentially plays an important role for the evolution of glacial cycles. Here climatic effects from the dust direct radiative forcing (DRF) caused by absorption and scattering of solar radiation are investigated. Key elements controlling the dust DRF are the atmospheric dust distribution and the absorption-scattering efficiency of dust aerosols. Effective physical parameters in the description of these elements are varied within uncertainty ranges known from available data and detailed model studies. Although the parameters can be reasonably constrained, the simulated dust DRF spans a~wide uncertainty range related to the strong nonlinearity of the Earth system. In our simulations, the dust DRF is highly localized. Medium-range parameters result in negative DRF of several watts per square metre in regions close to major dust sources and negligible values elsewhere. In the case of high absorption efficiency, the local dust DRF can reach positive values and the global mean DRF can be insignificantly small. In the case of low absorption efficiency, the dust DRF can produce a significant global cooling in glacial periods, which leads to a doubling of the maximum glacial ice volume relative to the case with small dust DRF. DRF-induced temperature and precipitation changes can either be attenuated or amplified through a feedback loop involving the dust cycle. The sensitivity experiments suggest that depending on dust optical parameters, dust DRF has the potential to either damp or reinforce glacial–interglacial climate changes.
Type: article; Text
Publishing status: publishedVersion
DDC: 550
License: CC BY 3.0 Unported
Link to license: https://creativecommons.org/licenses/by/3.0/
Appears in Collections:Geowissenschaften

Show full item record
Bauer, E. and A. Ganopolski, 2014. Sensitivity simulations with direct shortwave radiative forcing by aeolian dust during glacial cycles. 2014. München : European Geopyhsical Union
Bauer, E. and Ganopolski, A. (2014) “Sensitivity simulations with direct shortwave radiative forcing by aeolian dust during glacial cycles.” München : European Geopyhsical Union. doi: https://doi.org/10.5194/cp-10-1333-2014.
Bauer E, Ganopolski A. Sensitivity simulations with direct shortwave radiative forcing by aeolian dust during glacial cycles. München : European Geopyhsical Union; 2014.
Bauer, E., & Ganopolski, A. (2014). Sensitivity simulations with direct shortwave radiative forcing by aeolian dust during glacial cycles (Version publishedVersion). Version publishedVersion. München : European Geopyhsical Union. https://doi.org/https://doi.org/10.5194/cp-10-1333-2014
Bauer E, Ganopolski A. Sensitivity simulations with direct shortwave radiative forcing by aeolian dust during glacial cycles. Published online 2014. doi:https://doi.org/10.5194/cp-10-1333-2014


This item is licensed under a Creative Commons License Creative Commons