Methanesulphonic acid movement in solid ice cores
Methanesulphonic acid movement in solid ice cores
复制标题
固体冰芯中甲磺酸的运动
DOI：
10.3189/172756404781814645
复制
发表时间：
2004
影响因子：
2.9
通讯作者：
M. Curran
中科院分区：
文献类型：
--
作者：
Barbara T. Smith;T. V. van Ommen;M. Curran
摘要 甲磺酸（MSA）是冰芯中重要的痕量离子成分，与生物活性和海冰分布有关。 MSA 沉积后的运动已在冰中得到记录，本研究通过测量冰芯储存 14.5 年后几个水平部分的 MSA 分布变化来研究固体冰的运动。使用的核心来自东南极洲劳穹穹顶南的气泡封闭深度以下。以 3 厘米和 0.5 厘米分辨率在芯宽度上研究 MSA 浓度。其分布在整个核心中心是均匀的，但外部 3 厘米的浓度梯度下降到核心边缘中心值的一半以下。这种效应与 14.5 年储存期间向周围空气的扩散一致。扩散系数计算为 2 ×10–13 m2 s–1，并讨论了扩散机制的含义。
Abstract Methanesulphonic acid (MSA) is an important trace-ion constituent in ice cores, with connections to biological activity and sea-ice distribution. Post-depositional movement of MSA has been documented in firn, and this study investigates movement in solid ice by measuring variations in MSA distribution across several horizontal sections from an ice core after 14.5 years storage. The core used is from below the bubble close-off depth at Dome Summit South, Law Dome, East Antarctica. MSA concentration was studied at 3 and 0.5 cm resolution across the core widths. Its distribution was uniform through the core centres, but the outer 3 cm showed gradients in concentrations down to less than half of the central value at the core edge. This effect is consistent with diffusion to the surrounding air during its 14.5 year storage. The diffusion coefficient is calculated to be 2 ×10–13 m2 s–1, and the implications for the diffusion mechanism are discussed.