| DOI: | 10.5194/tc-10-2057-2016
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| Scopus记录号: | 2-s2.0-84987916127
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| 论文题名: | Direct visualization of solute locations in laboratory ice samples |
| 作者: | Hullar T; , Anastasio C
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| 刊名: | Cryosphere
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| ISSN: | 19940416
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| 出版年: | 2016
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| 卷: | 10, 期:5 | | 起始页码: | 2057
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| 结束页码: | 2068
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| 语种: | 英语
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| 英文关键词: | air bubble
; air-ice interaction
; chemical reaction
; experimental design
; ice
; laboratory method
; solute
; temperature effect
; visualization
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| 英文摘要: | Many important chemical reactions occur in polar snow, where solutes may be present in several reservoirs, including at the air-ice interface and in liquid-like regions within the ice matrix. Some recent laboratory studies suggest chemical reaction rates may differ in these two reservoirs. While investigations have examined where solutes are found in natural snow and ice, few studies have examined either solute locations in laboratory samples or the possible factors controlling solute segregation. To address this, we used micro-computed tomography (microCT) to examine solute locations in ice samples prepared from either aqueous cesium chloride (CsCl) or rose bengal solutions that were frozen using several different methods. Samples frozen in a laboratory freezer had the largest liquid-like inclusions and air bubbles, while samples frozen in a custom freeze chamber had somewhat smaller air bubbles and inclusions; in contrast, samples frozen in liquid nitrogen showed much smaller concentrated inclusions and air bubbles, only slightly larger than the resolution limit of our images (∼ 2 μm). Freezing solutions in plastic vs. glass vials had significant impacts on the sample structure, perhaps because the poor heat conductivity of plastic vials changes how heat is removed from the sample as it cools. Similarly, the choice of solute had a significant impact on sample structure, with rose bengal solutions yielding smaller inclusions and air bubbles compared to CsCl solutions frozen using the same method. Additional experiments using higher-resolution imaging of an ice sample show that CsCl moves in a thermal gradient, supporting the idea that the solutes in ice are present in mobile liquid-like regions. Our work shows that the structure of laboratory ice samples, including the location of solutes, is sensitive to the freezing method, sample container, and solute characteristics, requiring careful experimental design and interpretation of results. © Author(s) 2016. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/75079
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| Appears in Collections: | 影响、适应和脆弱性
气候变化与战略
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作者单位: | Department of Land, Air, and Water Resources, University of California, Davis, United States
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| Recommended Citation: | |
Hullar T,, Anastasio C. Direct visualization of solute locations in laboratory ice samples[J]. Cryosphere,2016-01-01,10(5)
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