Eolian flux in the Chinese Loess Plateau was reconstructed by measuring the dry bulk density and CaCO3 content of the late Cenozoic loess-paleosol-red clay sequences in the Lingtai profile. Comparison of eolian flux v...Eolian flux in the Chinese Loess Plateau was reconstructed by measuring the dry bulk density and CaCO3 content of the late Cenozoic loess-paleosol-red clay sequences in the Lingtai profile. Comparison of eolian flux variation between the Lingtai profile and the ODP sites 885/886 in the North Pacific shows a significant wet-dry variability in addition to a gradual drying trend in the dust source regions in interior Asia. Especially, the increase of eolian fluxes from both continental and pelagic eolian sediments indicates a sharp drying of the dust source regions between 3.6 and 2.6 MaBP, which might be attributed to the tectonic uplift of the Tibetan Plateau, which cut down the moisture input to the interior Asia. The average value and variability of eolian flux are higher after 2.6 MaBP than before, which may be related to the Quaternary climatic fluctuations on the glacial-interglacial timescale after the commencement of major Northern Hemisphere Glaciations. The eolian fluxes of the Lingtai profile and Core V21-146 in northwest Pacific show a synchronous variation on the 103-105 a timescale, indicating that the flux variations from both continental and marine records are closely correlated to the Quaternary climatic fluctuation forced by the ice volume changes on a global scale.展开更多
The wind is a basic factor in the atmosphere subsystem in the Earth system, and an agent in transferring the mass and energy within the system. The grain size and mass flux of the eolian dust in the Neocene deep-sea s...The wind is a basic factor in the atmosphere subsystem in the Earth system, and an agent in transferring the mass and energy within the system. The grain size and mass flux of the eolian dust in the Neocene deep-sea sediments recorded the intensity of the atmospheric circulation and the aridity in the dust source area. The loess on the Loess Plateau, the dust accumulation after its origin, transportation, deposition, and reworked process, is展开更多
基金This work was supported by the Key Project of Knowledge Innovation of the CAS (Grant Nos. KZCXl-10-01 and KZCX2-108) the National Natural Science Foundation of China (Grant Nos. 40106006 and 90102017) the National Key Basic Research Development
文摘Eolian flux in the Chinese Loess Plateau was reconstructed by measuring the dry bulk density and CaCO3 content of the late Cenozoic loess-paleosol-red clay sequences in the Lingtai profile. Comparison of eolian flux variation between the Lingtai profile and the ODP sites 885/886 in the North Pacific shows a significant wet-dry variability in addition to a gradual drying trend in the dust source regions in interior Asia. Especially, the increase of eolian fluxes from both continental and pelagic eolian sediments indicates a sharp drying of the dust source regions between 3.6 and 2.6 MaBP, which might be attributed to the tectonic uplift of the Tibetan Plateau, which cut down the moisture input to the interior Asia. The average value and variability of eolian flux are higher after 2.6 MaBP than before, which may be related to the Quaternary climatic fluctuations on the glacial-interglacial timescale after the commencement of major Northern Hemisphere Glaciations. The eolian fluxes of the Lingtai profile and Core V21-146 in northwest Pacific show a synchronous variation on the 103-105 a timescale, indicating that the flux variations from both continental and marine records are closely correlated to the Quaternary climatic fluctuation forced by the ice volume changes on a global scale.
文摘The wind is a basic factor in the atmosphere subsystem in the Earth system, and an agent in transferring the mass and energy within the system. The grain size and mass flux of the eolian dust in the Neocene deep-sea sediments recorded the intensity of the atmospheric circulation and the aridity in the dust source area. The loess on the Loess Plateau, the dust accumulation after its origin, transportation, deposition, and reworked process, is
