Journal ArticleDOI
Concentrations and properties of ice nucleating substances in exudates from Antarctic sea-ice diatoms
Yu Xi,Alexia Mercier,Cheng Kuang,Jingwei Yun,Ashton Christy,Luke Melo,Maria T. Maldonado,James A. Raymond,Allan K. Bertram +8 more
TLDR
The number of INSs per mass of DOC for the supernatant samples were lower than those reported previously for the sea surface microlayer and bulk sea water collected in the Arctic and Atlantic, and possible candidates for these INSs include protein containing nanogels.Abstract:
The ocean contains ice nucleating substances (INSs), some of which can be emitted to the atmosphere where they can influence the formation and properties of clouds. A possible source of INSs in the ocean is exudates from sea-ice diatoms. Here we examine the concentrations and properties of INSs in supernatant samples from dense sea-ice diatom communities collected from Ross Sea and McMurdo Sound in the Antarctic. The median freezing temperatures of the samples ranged from approximately -17 to -22 °C. Based on our results and a comparison with results reported in the literature, the ice nucleating ability of exudates from sea-ice diatoms is likely not drastically different from the ice nucleating ability of exudates from temperate diatoms. The number of INSs per mass of DOC for the supernatant samples were lower than those reported previously for the sea surface microlayer and bulk sea water collected in the Arctic and Atlantic. The INSs in the supernatant sample collected from Ross Sea were not sensitive to temperatures up to 100 °C, were larger than 300 kDa, and were different from ice shaping and recrystallization inhibiting molecules present in the same sample. Possible candidates for these INSs include polysaccharide containing nanogels. The INSs in the supernatant sample collected from McMurdo Sound were sensitive to temperatures of 80 and 100 °C and were larger than 1000 kDa. Possible candidates for these INSs include protein containing nanogels.read more
Citations
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Contribution of Feldspar and Marine Organic aerosols to global ice nucleating particles concentrations
Jesús Vergara Temprado,Benjamin J. Murray,T. W. Wilson,Daniel O'Sullivan,J. Browse,Kirsty J. Pringle,Karin Ardon-Dryer,Allan K. Bertram,Susannah M. Burrows,Darius Cerbunis,Paul J. DeMott,Ryan H. Mason,Colin D. O'Dowd,Matteo Rinaldi,Kenneth S. Carslaw +14 more
TL;DR: In this article, the authors developed a global model of INP concentrations relevant for mixed-phase clouds based on laboratory and field measurements of ice nucleation by K-feldspar (an ice active component of desert dust) and marine organic aerosols (from sea spray).
Journal ArticleDOI
Effects of Inorganic Acids and Organic Solutes on the Ice Nucleating Ability and Surface Properties of Potassium-Rich Feldspar
Jingwei Yun,Anand Kumar,Nicole Removski,Andrey Shchukarev,Nicole Link,Jean-François Boily,Allan K. Bertram +6 more
TL;DR: The freezing efficiency of these particles can, however, be strongly affected by solutes, such as inorganic aci... as mentioned in this paper, which can initiate the freezing of cloud droplets in the atmosphere.
Journal ArticleDOI
Terrestrial or marine – indications towards the origin of ice-nucleating particles during melt season in the European Arctic up to 83.7° N
Markus Hartmann,Xianda Gong,Xianda Gong,Simonas Kecorius,Manuela van Pinxteren,Teresa Vogl,Teresa Vogl,André Welti,André Welti,Heike Wex,Sebastian Zeppenfeld,Hartmut Herrmann,Alfred Wiedensohler,Frank Stratmann +13 more
TL;DR: In this paper, the ice nucleation properties of samples from different environmental compartments, i.e., the sea surface microlayer (SML), the bulk seawater (BSW), and fog water, were investigated.
Journal ArticleDOI
Atmospheric Humic-Like Substances (HULIS) Act as Ice Active Entities
J. Chen,Zhijun Wu,Xi Zhao,Yuchen Wang,J. C. Chen,Yanting Qiu,T. M. Zong,H. X. Chen,Bingbing Wang,Peng Lin,Peng Lin,Wen Liu,Song Guo,Maosheng Yao,L. M. Zeng,Heike Wex,Xiaohong Liu,Min Hu,Shao-Meng Li +18 more
Journal ArticleDOI
The effect of (NH 4 ) 2 SO 4 on the freezing properties of non-mineral dust ice-nucleating substances of atmospheric relevance
Soleil E. Worthy,Anand Kumar,Yu Xi,Jingwei Yun,Jessie Chen,Cuishan Xu,Victoria E. Irish,Pierre Amato,Allan K. Bertram +8 more
TL;DR: In this article, the authors studied the effect of dilute (NH4)2SO4 solutions on immersion freezing of a variety of non-mineral dust ice nucleating substances (INSs) including bacteria, fungi, sea ice diatom exudates, sea surface microlayer substances, and humic substances using the droplet-freezing technique.
References
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