首页> 外文期刊>Journal of Geophysical Research, D. Atmospheres: JGR >The role of seasonality of mineral dust concentration and size on glacial/interglacial dust changes in the EPICA Dronning Maud Land ice core
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The role of seasonality of mineral dust concentration and size on glacial/interglacial dust changes in the EPICA Dronning Maud Land ice core

机译:矿物尘埃浓度和大小的季节性对EPICA Dronning Maud Land冰芯冰期/间冰期尘埃变化的影响

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摘要

We present a record of particulate dust concentration and size distribution in subannual resolution measured on the European Project for Ice Coring in Antarctica (EPICA) Dronning Maud Land (EDML) ice core drilled in the Atlantic sector of the East Antarctic plateau. The record reaches from present day back to the penultimate glacial until 145,000 years B.P. with subannual resolution from 60,000 years B.P. to the present. Mean dust concentrations are a factor of 46 higher during the glacial (~850–4600 ng/mL) compared to the Holocene (~16–112 ng/mL) with slightly smaller dust particles during the glacial compared to the Holocene and with an absolute minimum in the dust size at 16,000 years B.P. The changes in dust concentration are mainly attributed to changes in source conditions in southern South America. An increase in the modal value of the dust size suggests that at 16,000 years B.P. a major change in atmospheric circulation apparently allowed more direct transport of dust particles to the EDML drill site. We find a clear in-phase relation of the seasonal variation in dust mass concentration and dust size during the glacial (r(conc,size) = 0.8) but no clear phase relationship during the Holocene (0
机译:我们以次年分辨率记录了在南极洲东部高原大西洋地区钻探的欧洲冰芯项目 (EPICA) Dronning Maud Land (EDML) 冰芯上测量的颗粒尘埃浓度和尺寸分布。记录从今天追溯到倒数第二个冰期,直到公元前 145,000 年,从公元前 60,000 年到现在的次年度分辨率。与全新世(~16-112 ng/mL)相比,冰川期的平均尘埃浓度(~850-4600 ng/mL)高出46倍,与全新世相比,冰期的尘埃颗粒略小,尘埃大小的绝对最小值为16,000 B.P.。沙尘浓度的变化主要归因于南美洲南部源条件的变化。尘埃大小模态值的增加表明,在16,000年B.P.时,大气环流的重大变化显然允许尘埃颗粒更直接地输送到EDML钻探地点。我们发现冰川期尘埃质量浓度和尘埃大小的季节性变化有明显的同相关系(r(conc,size) = 0.8),但在全新世期间没有明确的相位关系(0

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