低温盐水的冰下形成机制

IF 2.5 4区 地球科学 Q2 GEOGRAPHY, PHYSICAL
S. Neuhaus, S. Tulaczyk
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引用次数: 0

摘要

摘要尽管低温卤水可能包含过去冰盖行为的信息,但它们的研究仍在进行中。低温盐水是通过海水的低温浓缩形成的,尽管具体的环境和形成机制一直存在争议。以前的盐水形成概念模型需要在经历冰冻的封闭盆地中将海水与海洋隔离。相反,我们提出,它们可能在经历了冰盖前进和后退的重复循环的海洋沉积物的孔隙中形成。在基础冻结期间,低温浓缩产生高盐度盐水,其经历由不稳定密度分层驱动的向下流动。我们的孔隙水化学演化平流-扩散模型成功地再现了两个含有低温盐水的南极深部核心(AND-1B和AND-2A)的孔隙水的化学,表明低温盐水可以通过现代和过去冰盖冰下沉积物孔隙空间内海水的重复隔离和低温浓缩而形成。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Mechanism for the subglacial formation of cryogenic brines
Abstract Cryogenic brines are under-studied, despite the fact that they may contain information about past ice-sheet behavior. Cryogenic brines form through cryoconcentration of seawater, although the specific setting and mechanism of formation have been debated. Previous conceptual models of brine formation require seawater isolation from the ocean in a closed basin experiencing freezing. We propose instead that they may form in pore spaces of marine sediments subjected to repeat cycles of ice-sheet advance and retreat. During periods of basal freezing, cryoconcentration produces hypersaline brines which experience downward flow driven by unstable density stratification. Our advection-diffusion model of porewater chemistry evolution successfully recreates the porewater chemistry of two deep Antarctic cores containing cryogenic brines (AND-1B and AND-2A), suggesting that cryogenic brines can be formed through the repeated isolation and cryoconcentration of marine waters within subglacial sediment pore spaces of modern and past ice sheets.
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来源期刊
Annals of Glaciology
Annals of Glaciology GEOGRAPHY, PHYSICAL-GEOSCIENCES, MULTIDISCIPLINARY
CiteScore
8.20
自引率
0.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: Annals of Glaciology publishes original scientific articles and letters in selected aspects of glaciology-the study of ice. Each issue of the Annals is thematic, focussing on a specific subject. The Council of the International Glaciological Society welcomes proposals for thematic issues from the glaciological community. Once a theme is approved, the Council appoints an Associate Chief Editor and a team of Scientific Editors to handle the submission, peer review and publication of papers.
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