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Dust sources and deposition in the last glacial maximum and current climate
Vise andre og tillknytning
Ansvarlig organisasjon
1999 (engelsk)Inngår i: Journal of Geophysical Research, Vol. 104, nr D13, s. 15 895-15 916Artikkel i tidsskrift (Fagfellevurdert)
Abstract [en]
Mineral dust aerosols in the atmosphere have the potential to affect the global climate by influencing the radiative balance of the atmosphere and the supply of micronutrients to the ocean. Ice and marine sediment cores indicate that dust deposition from the atmosphere was at some locations 2–20 times greater during glacial periods, raising the possibility that mineral aerosols might have contributed to climate change on glacial-interglacial time scales. To address this question, we have used linked terrestrial biosphere, dust source, and atmospheric transport models to simulate the dust cycle in the atmosphere for current and last glacial maximum (LGM) climates. We obtain a 2.5-fold higher dust loading in the entire atmosphere and a twenty-fold higher loading in high latitudes, in LGM relative to present. Comparisons to a compilation of atmospheric dust deposition flux estimates for LGM and present in marine sediment and ice cores show that the simulated flux ratios are broadly in agreement with observations; differences suggest where further improvements in the simple dust model could be made. The simulated increase in high-latitude dustiness depends on the expansion of unvegetated areas, especially in the high latitudes and in central Asia, caused by a combination of increased aridity and low atmospheric [CO2]. The existence of these dust source areas at the LGM is supported by pollen data and loess distribution in the northern continents. These results point to a role for vegetation feedbacks, including climate effects and physiological effects of low [CO2], in modulating the atmospheric distribution of dust.
sted, utgiver, år, opplag, sider
1999. Vol. 104, nr D13, s. 15 895-15 916
Emneord [en]
palaeoclimatology, ice core, Renland Expedition 1988, Renland Project, Arctic, Greenland, Renland
Identifikatorer
URN: urn:nbn:se:polar:diva-1167DOI: 10.1029/1999JD900084 OAI: oai:DiVA.org:polar-1167DiVA, id: diva2:569303
Merknad

Source: Polardok by Swedish Polar Research Secretariat

Tilgjengelig fra: 2012-11-15 Laget: 2012-11-15 Sist oppdatert: 2012-11-15

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