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| Titel |
Twelve thousand years of dust: the Holocene global dust cycle constrained by natural archives |
| VerfasserIn |
S. Albani, N. M. Mahowald, G. Winckler, R. F. Anderson, L. I. Bradtmiller, B. Delmonte, R. Francois, M. Goman, N. G. Heavens, P. P. Hesse, S. A. Hovan, S. G. Kang, K. E. Kohfeld, H. Lu, V. Maggi, J. A. Mason, P. A. Mayewski, D. McGee, X. Miao, B. L. Otto-Bliesner, A. T. Perry, A. Pourmand, H. M. Roberts, N. Rosenbloom, T. Stevens, J. Sun |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 11, no. 6 ; Nr. 11, no. 6 (2015-06-11), S.869-903 |
| Datensatznummer |
250117319
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| Publikation (Nr.) |
 copernicus.org/cp-11-869-2015.pdf |
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| Zusammenfassung |
| Mineral dust plays
an important role in the climate system by interacting
with radiation, clouds, and biogeochemical cycles. In addition, natural
archives show that the dust cycle experienced variability in the past in
response to global and local climate change. The compilation of the DIRTMAP (Dust Indicators and Records from
Terrestrial and MArine Palaeoenvironments) paleodust data sets in the last 2 decades provided a benchmark for paleoclimate
models that include the dust cycle, following a time slice approach. We
propose an innovative framework to organize a paleodust data set that builds on the positive experience of DIRTMAP and takes into account new scientific
challenges by providing a concise and accessible data set of temporally
resolved records of dust mass accumulation rates and particle grain size
distributions. We consider data from ice cores, marine sediments,
loess–paleosol sequences, lake sediments, and peat bogs for this compilation,
with a temporal focus on the Holocene period. This global compilation allows
the investigation of the potential, uncertainties, and confidence level of dust
mass accumulation rate reconstructions and highlights the importance of
dust particle size information for accurate and quantitative reconstructions
of the dust cycle. After applying criteria that help to establish that the
data considered represent changes in dust deposition, 45 paleodust records
have been identified, with the highest density of dust deposition data
occurring in the North Atlantic region. Although the temporal evolution of
dust in the North Atlantic appears consistent across several cores and
suggests that minimum dust fluxes are likely observed during the early to
mid-Holocene period (6000–8000 years ago), the magnitude of dust fluxes in
these observations is not fully consistent, suggesting that more work needs
to be done to synthesize data sets for the Holocene. Based on the data
compilation, we used the Community Earth System Model to estimate the mass
balance of and variability in the global dust cycle during the Holocene, with
dust loads ranging from 17.2 to 20.8 Tg between 2000 and 10 000 years ago
and with a minimum in the early to mid-Holocene (6000–8000 years ago). |
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