气候变化领域集成服务门户(CCPortal): The ice-nucleating ability of quartz immersed in water and its atmospheric importance compared to K-feldspar

CCPortal

DOI	10.5194/acp-19-11343-2019
	The ice-nucleating ability of quartz immersed in water and its atmospheric importance compared to K-feldspar
	Harrison A.D.; Lever K.; Sanchez-Marroquin A.; Holden M.A.; Whale T.F.; Tarn M.D.; McQuaid J.B.; Murray B.J.
发表日期	2019
ISSN	16807316
起始页码	11343
结束页码	11361
卷号	19 期号:17
英文摘要	Mineral dust particles are thought to be an important type of ice-nucleating particle (INP) in the mixedphase cloud regime around the globe. While K-rich feldspar (K-feldspar) has been identified as being a particularly important component of mineral dust for ice nucleation, it has been shown that quartz is also relatively ice-nucleation active. Given quartz typically makes up a substantial proportion of atmospheric desert dust, it could potentially be important for cloud glaciation. Here, we survey the ice-nucleating ability of 10 a-quartz samples (the most common quartz polymorph) when immersed in microlitre supercooled water droplets. Despite all samples being a-quartz, the temperature at which they induce freezing varies by around 12 °C for a constant active site density. We find that some quartz samples are very sensitive to ageing in both aqueous suspension and air, resulting in a loss of ice-nucleating activity, while other samples are insensitive to exposure to air and water over many months. For example, the ice-nucleation temperatures for one quartz sample shift down by ∼ 2 °C in 1 h and 12 °C after 16 months in water. The sensitivity to water and air is perhaps surprising, as quartz is thought of as a chemically resistant mineral, but this observation suggests that the active sites responsible for nucleation are less stable than the bulk of the mineral. We find that the quartz group of minerals is generally less active than K-feldspars by roughly 7 °C, although the most active quartz samples are of a similar activity to some K-feldspars with an active site density, ns.T /, of 1 cm-2 at -9 °C. We also find that the freshly milled quartz samples are generally more active by roughly 5 °C than the plagioclase feldspar group of minerals and the albite end member has an intermediate activity. Using both the new and literature data, active site density parameterizations have been proposed for freshly milled quartz, K-feldspar, plagioclase and albite. Combining these parameterizations with the typical atmospheric abundance of each mineral supports previous work that suggests that K-feldspar is the most important ice-nucleating mineral in airborne mineral dust. © 2019 Author(s).
语种	英语
scopus关键词	atmospheric chemistry; cloud microphysics; concentration (composition); dust; feldspar; ice; nucleation; quartz
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/144165
作者单位	School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, United Kingdom; School of Chemistry, University of Leeds, Leeds, LS2 9JT, United Kingdom; School of Physics, University of Leeds, Leeds, LS2 9JT, United Kingdom; School of Physical Sciences and Computing, University of Central Lancashire, Preston, PR1 2HE, United Kingdom
推荐引用方式 GB/T 7714	Harrison A.D.,Lever K.,Sanchez-Marroquin A.,et al. The ice-nucleating ability of quartz immersed in water and its atmospheric importance compared to K-feldspar[J],2019,19(17).
APA	Harrison A.D..,Lever K..,Sanchez-Marroquin A..,Holden M.A..,Whale T.F..,...&Murray B.J..(2019).The ice-nucleating ability of quartz immersed in water and its atmospheric importance compared to K-feldspar.Atmospheric Chemistry and Physics,19(17).
MLA	Harrison A.D.,et al."The ice-nucleating ability of quartz immersed in water and its atmospheric importance compared to K-feldspar".Atmospheric Chemistry and Physics 19.17(2019).