Detailed Information on Publication Record
2017
Evaporating brine from frost flowers with electron microscopy and implications for atmospheric chemistry and sea-salt aerosol formation
YANG, Xin, Vilém NEDĚLA, Jiří RUNŠTUK, Gabriela ONDRUŠKOVÁ, Ján KRAUSKO et. al.Basic information
Original name
Evaporating brine from frost flowers with electron microscopy and implications for atmospheric chemistry and sea-salt aerosol formation
Authors
YANG, Xin (826 United Kingdom of Great Britain and Northern Ireland), Vilém NEDĚLA (203 Czech Republic), Jiří RUNŠTUK (203 Czech Republic), Gabriela ONDRUŠKOVÁ (703 Slovakia, belonging to the institution), Ján KRAUSKO (703 Slovakia, belonging to the institution), Ľubica VETRÁKOVÁ (703 Slovakia, belonging to the institution) and Dominik HEGER (203 Czech Republic, guarantor, belonging to the institution)
Edition
Atmospheric Chemistry and Physics, GOTTINGEN, COPERNICUS GESELLSCHAFT MBH, 2017, 1680-7316
Other information
Language
English
Type of outcome
Článek v odborném periodiku
Field of Study
10509 Meteorology and atmospheric sciences
Country of publisher
Germany
Confidentiality degree
není předmětem státního či obchodního tajemství
References:
Impact factor
Impact factor: 5.509
RIV identification code
RIV/00216224:14310/17:00095496
Organization unit
Faculty of Science
UT WoS
000401921300001
Keywords in English
EXPERIMENTAL-COMPUTATIONAL APPROACH; AQUEOUS-SOLUTIONS; BOUNDARY-LAYER; BLOWING SNOW; SPECTROSCOPIC PROPERTIES; LOW-TEMPERATURES; OZONE DEPLETION; ICE NUCLEATION; HEXAGONAL ICE; IN-SITU
Tags
International impact, Reviewed
Změněno: 3/4/2018 15:11, Ing. Nicole Zrilić
Abstract
V originále
An environmental scanning electron microscope (ESEM) was used for the first time to obtain well-resolved images, in both temporal and spatial dimensions, of lab-prepared frost flowers (FFs) under evaporation within the chamber temperature range from -5 to -18 degrees C and pressures above 500 Pa. Our scanning shows temperature-dependent NaCl speciation: the brine covering the ice was observed at all conditions, whereas the NaCl crystals were formed at temperatures below -10 degrees C as the brine oversaturation was achieved. Finger-like ice structures covered by the brine, with a diameter of several micrometres and length of tens to 100 mu m, are exposed to the ambient air. The brine-covered fingers are highly flexible and cohesive. The exposure of the liquid brine on the micrometric fingers indicates a significant increase in the brine surface area compared to that of the flat ice surface at high temperatures; the NaCl crystals formed can become sites of heterogeneous reactivity at lower temperatures. There is no evidence that, without external forces, salty FFs could automatically fall apart to create a number of sub-particles at the scale of micrometres as the exposed brine fingers seem cohesive and hard to break in the middle. The fingers tend to combine together to form large spheres and then join back to the mother body, eventually forming a large chunk of salt after complete dehydration. The present microscopic observation rationalizes several previously unexplained observations, namely, that FFs are not a direct source of sea-salt aerosols and that saline ice crystals under evapora-tion could accelerate the heterogeneous reactions of bromine liberation.
Links
| GA15-12386S, research and development project |
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| LM2011028, research and development project |
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| LO1214, research and development project |
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