Role of atmospheric aerosol in the sudden climate change indicated in the Antarctic ice core.

在南极洲富士圆顶（77°19'S，39° 42 'E）的第一个冰芯（2503米长）中保存了过去32万年的气候变化。在这项研究中，我们测量了总的（溶解+颗粒）的金属浓度在这个核心，澄清了气溶胶的浓度和通量随气候变化的变化。针对适用于终端的深度，以0.5-lkr的间隔从岩芯切割出厚度约为7 cm、质量约为70 g的冰块。将样品在7 ml Teflon容器中熔化并蒸发至干，以避免微粒损失。残渣用微波酸消解法分解，用ICPMS和ICPAES测定样品溶液中Al、Fe、Mn、Ca等元素的含量。与间冰期相比，盛冰期冰芯中Al的总浓度（t-Al）较高。这种变化与Dome C堆芯的颗粒Al（p-Al，直径>0.45μm）的结果一致。Dome Fuji柱样中t-Al的浓度范围为3.94 ~ 276 ppb，最大值是Dome C柱样中p-Al的2倍多。结果表明，如果不考虑局部变化，南极冰盖中Al的主要成分可能是粒径小于0.45μm的细颗粒和/或水溶性。末次盛冰期和全新世时，富士穹的矿尘通量分别为21.7±11.9 mg m^<-2>yr^<-1>和2.56±1.91 mg m^<-2>yr^<-1>。这些数值与气候模型的预测值相当，比中纬度地区假定的通量大约小三个数量级。

Climate changes over the past 320 kyr are preserved in a 1st ice core (2503m length) from Dome Fuji (77°19'S, 39°42'E), Antarctica. In this research, we measured total (dissolved+particulate) concentration of metals in this core and clarified the variation of the concentration and flux of aerosol accompanying the climate change. Focusing on the depth applicable to the Terminations, an ice block with about 7cm thickness and 70g mass was cut from the core at 0.5-lkr intervals. The sample was melted and evaporated to dryness in a 7-ml Teflon container in order to avoid loss of particulates. The residue was decomposed by microwave acid digestion method and the concentrations of Al, Fe, Mn, Ca etc. in the sample solution were measured by ICPMS and ICPAES. The total concentration of Al (t-Al) in the core was high in the period of glacial maximum compared with the interglacial. This variation was coincide with the result of particulate Al (p-Al, >0.45μm diameter) from the Dome C core. The t-Al concentrations in the Dome Fuji core were ranged from 3.94 to 276ppb, and the maximum value was more than 2 times larger than that of p-Al in the Dome C core. The result, if it is not due to local variation, indicates that the significant part of Al in Antarctic ice sheet would be fine particles less than 0.45μm diameter and/or would be water soluble. Estimated mineral dust fluxes to Dome Fuji were 21.7±11.9 mg m^<-2> yr^<-1> in LGM and 2.56±1.91 mg m^<-2> yr^<-1> in Holocene. These values were comparable to predicted values by a climate model and were approximately three orders of magnitude smaller than the presumed fluxes in the mid-latitude region.