Concentrations and properties of ice nucleating substances in exudates from Antarctic sea-ice diatoms

Xi, Yu; Mercier, Alexia; Kuang, Cheng; Yun, Jingwei; Christy, Ashton; Melo, Larisse Rayanne Miranda de; Maldonado, María T.; Raymond, James A.; Bertram, Allan K.

doi:10.1039/d0em00398k

Cited by 16 publications

(10 citation statements)

References 90 publications

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“…Freezing of the droplets was captured by a digital camera located at the top of the transparent chamber. The recorded video was analyzed either manually or automatically by a MATLAB script to determine the freezing temperature of each droplet . The interaction time of the K-rich feldspar with the solute was 10–15 min before freezing, which is sufficient to ensure full mixing in the droplets, as detailed further in Section S1 of the Supporting Information.…”

Section: Methodsmentioning

confidence: 99%

Effects of Inorganic Acids and Organic Solutes on the Ice Nucleating Ability and Surface Properties of Potassium-Rich Feldspar

Yun

Kumar

Removski

et al. 2021

ACS Earth Space Chem.

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Mineral dust particles can initiate the freezing of cloud droplets in the atmosphere. The freezing efficiency of these particles can, however, be strongly affected by solutes, such as inorganic acids, polyols, and carboxylic acids. Here, we report the effects of inorganic acids (HNO 3 and HCl), polyols, and carboxylic acids at low concentrations on the ice nucleating ability of potassium-rich feldspar (K-rich feldspar) using the droplet freezing technique. The inorganic acids and carboxylic acids decreased the median freezing temperature of droplets containing K-rich feldspar by up to 7 °C, while the polyols had no significant effect on the median freezing temperature. For the inorganic acids and carboxylic acids, the median freezing temperature was a strong function of the pH of the droplets, with the median freezing temperature decreasing as the pH decreased. By examining the surface properties of K-rich feldspar exposed to different concentrations of HCl with cryogenic X-ray photoelectron spectroscopy, we show that the decrease in the ice nucleating ability of Krich feldspar by the inorganic acids and carboxylic acids was likely caused by ion exchange (H 3 O + with parent K + in microcline) and the incongruent dissolution of Al with respect to Si at K-rich feldspar surfaces. The decrease in the ice nucleating ability of K-rich feldspar by the carboxylic acids only related to the pH of the droplets rather than the type of carboxylic acid and their expected binding mechanisms on K-rich feldspar. This study focuses on rare ice nucleating active sites (with an ice nucleating active site density of 10−600 cm −2 ) of the K-rich feldspar and short exposure times between the solutes and the K-rich feldspar. Further studies are needed to investigate more abundant ice nucleating active sites and longer exposure times, as well as K-rich feldspar samples from different sources.

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Section: Methodsmentioning

confidence: 99%

Effects of Inorganic Acids and Organic Solutes on the Ice Nucleating Ability and Surface Properties of Potassium-Rich Feldspar

Yun

Kumar

Removski

et al. 2021

ACS Earth Space Chem.

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“…The ice nucleating properties of the extracted suspensions were measured using the droplet freezing technique. 7,[28][29][30][31] For each trial, three siliconized glass slides (18 mm, HR3-239, Hampton Research) were cleaned with MilliQ water, dried with nitrogen gas, and then placed on a cooling stage (Grant Asymptote EF600 freezer). The uncertainty in the temperature measurement of the cooling stage was AE0.25 C, according to the manufacturer, which was conrmed using the melting temperatures measured for water and dodecane.…”

Section: Droplet Freezing Experimentsmentioning

confidence: 99%

Ice nucleating properties of airborne dust from an actively retreating glacier in Yukon, Canada

Downey

et al. 2022

Environ. Sci.: Atmos.

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“…For autonomous detection, the freezing temperature was assigned as the temperature when the first derivative of the brightness reached a maximum. 43 The uncertainty in the freezing temperature was ±0.25 °C based on specifications from the manufacturer.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…For autonomous detection, the freezing temperature was assigned as the 6 temperature when the first derivative of the brightness reached a maximum. 43 The uncertainty in the freezing temperature was 0.25 ℃ based on specifications from the manufacturer. ± After determining the freezing temperature of each droplet, the INP concentration in the air was calculated with the following equation.…”

Section: Inp Measurements For Samples Without Any Treatmentmentioning

confidence: 99%

Ice nucleating particles in the Canadian High Arctic during the fall of 2018

Yun

Evoy

Worthy

et al. 2022

Environ. Sci.: Atmos.

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Concentrations and properties of ice nucleating substances in exudates from Antarctic sea-ice diatoms

Abstract: Field Antarctic sea-ice diatom supernatant samples showed ice nucleating abilities.

Cited by 16 publications

References 90 publications

Effects of Inorganic Acids and Organic Solutes on the Ice Nucleating Ability and Surface Properties of Potassium-Rich Feldspar

Effects of Inorganic Acids and Organic Solutes on the Ice Nucleating Ability and Surface Properties of Potassium-Rich Feldspar

Ice nucleating properties of airborne dust from an actively retreating glacier in Yukon, Canada

Ice nucleating particles in the Canadian High Arctic during the fall of 2018

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