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Radiative forcing of climate by ice-age atmospheric dust

Claquin, T; Roelandt, C; Kohfeld, KE; Harrison, SP; Tegen, I; Prentice, IC; Balkanski, Y; Bergametti, G; Hansson, M and Mahowald, N, et al. (2003) In Climate Dynamics 20(2-3). p.193-202
Abstract
During glacial periods, dust deposition rates and inferred atmospheric concentrations were globally much higher than present. According to recent model results, the large enhancement of atmospheric dust content at the last glacial maximum (LGM) can be explained only if increases in the potential dust source areas are taken into account. Such increases are to be expected, due to effects of low precipitation and low atmospheric (CO2) on plant growth. Here the modelled three-dimensional dust fields from Mahowald et al. and modelled seasonally varying surface-albedo fields derived in a parallel manner, are used to quantify the mean radiative forcing due to modern (non-anthropogenic) and LGM dust. The effect of mineralogical provenance on the... (More)
During glacial periods, dust deposition rates and inferred atmospheric concentrations were globally much higher than present. According to recent model results, the large enhancement of atmospheric dust content at the last glacial maximum (LGM) can be explained only if increases in the potential dust source areas are taken into account. Such increases are to be expected, due to effects of low precipitation and low atmospheric (CO2) on plant growth. Here the modelled three-dimensional dust fields from Mahowald et al. and modelled seasonally varying surface-albedo fields derived in a parallel manner, are used to quantify the mean radiative forcing due to modern (non-anthropogenic) and LGM dust. The effect of mineralogical provenance on the radiative properties of the dust is taken into account, as is the range of optical properties associated with uncertainties about the mixing state of the dust particles. The high-latitude (poleward of 45degrees) mean change in forcing (LGM minus modern) is estimated to be small (-0.9 to +0.2 W m(-2)), especially when compared to nearly -20 W m(-2) due to reflection from the extended ice sheets. Although the net effect of dust over ice sheets is a positive forcing (warming), much of the simulated high-latitude dust was not over the ice sheets, but over unglaciated regions close to the expanded dust source region in central Asia. In the tropics the change in forcing is estimated to be overall negative, and of similarly large magnitude (-2.2 to -3.2 W m(-2)) to the radiative cooling effect of low atmospheric (CO2). Thus, the largest long-term climatic effect of the LGM dust is likely to have been a cooling of the tropics. Low tropical sea-surface temperatures, low atmospheric (CO2) and high atmospheric dust loading may be mutually reinforcing due to multiple positive feedbacks, including the negative radiative forcing effect of dust. (Less)
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Climate Dynamics
volume
20
issue
2-3
pages
193 - 202
publisher
Springer
external identifiers
  • wos:000180835700005
  • scopus:0037264014
ISSN
1432-0894
DOI
10.1007/s00382-002-0269-1
language
English
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yes
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8b054cd8-3cd4-44e1-933e-9ee1a7c7031d (old id 318751)
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2007-08-28 09:52:40
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@article{8b054cd8-3cd4-44e1-933e-9ee1a7c7031d,
  abstract     = {During glacial periods, dust deposition rates and inferred atmospheric concentrations were globally much higher than present. According to recent model results, the large enhancement of atmospheric dust content at the last glacial maximum (LGM) can be explained only if increases in the potential dust source areas are taken into account. Such increases are to be expected, due to effects of low precipitation and low atmospheric (CO2) on plant growth. Here the modelled three-dimensional dust fields from Mahowald et al. and modelled seasonally varying surface-albedo fields derived in a parallel manner, are used to quantify the mean radiative forcing due to modern (non-anthropogenic) and LGM dust. The effect of mineralogical provenance on the radiative properties of the dust is taken into account, as is the range of optical properties associated with uncertainties about the mixing state of the dust particles. The high-latitude (poleward of 45degrees) mean change in forcing (LGM minus modern) is estimated to be small (-0.9 to +0.2 W m(-2)), especially when compared to nearly -20 W m(-2) due to reflection from the extended ice sheets. Although the net effect of dust over ice sheets is a positive forcing (warming), much of the simulated high-latitude dust was not over the ice sheets, but over unglaciated regions close to the expanded dust source region in central Asia. In the tropics the change in forcing is estimated to be overall negative, and of similarly large magnitude (-2.2 to -3.2 W m(-2)) to the radiative cooling effect of low atmospheric (CO2). Thus, the largest long-term climatic effect of the LGM dust is likely to have been a cooling of the tropics. Low tropical sea-surface temperatures, low atmospheric (CO2) and high atmospheric dust loading may be mutually reinforcing due to multiple positive feedbacks, including the negative radiative forcing effect of dust.},
  author       = {Claquin, T and Roelandt, C and Kohfeld, KE and Harrison, SP and Tegen, I and Prentice, IC and Balkanski, Y and Bergametti, G and Hansson, M and Mahowald, N and Rodhe, Håkan and Schulz, M},
  issn         = {1432-0894},
  language     = {eng},
  number       = {2-3},
  pages        = {193--202},
  publisher    = {Springer},
  series       = {Climate Dynamics},
  title        = {Radiative forcing of climate by ice-age atmospheric dust},
  url          = {http://dx.doi.org/10.1007/s00382-002-0269-1},
  volume       = {20},
  year         = {2003},
}