Issue 2, 2022

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

Abstract

Ice nucleating particles (INPs) are a small subset of atmospheric particles that can initiate the formation of ice in clouds, including mixed-phase clouds. Here we report concentrations of INPs during October and November of 2018 at Alert, Nunavut, in the Canadian High Arctic. Our results show that average INP concentrations in October were higher than those in November. Based on an ammonium sulfate assay, mineral dust was an important component of the INP population at temperatures (T) ≤ −21 °C and T ≤ −20 °C for October and November, respectively. Based on a heat assay, biological particles were an important component of the INP population at T ≥ −21 °C and T ≥ −16.5 °C for October and November, respectively. In addition, INP concentrations were correlated with aluminum concentrations (a tracer for mineral dust), possibly suggesting a significant fraction of the mineral dust and biological INPs came from the same source. Particle dispersion modelling and correlations between INP concentrations and aluminum suggest a significant fraction of the INPs came from ice-free and snow-free land at latitudes >50 °N. Since the coverage of ice-free and snow-free land in the Arctic is expected to increase as temperatures increase in the Arctic, these results have important implications for climate feedback mechanisms in the region.

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

Supplementary files

Article information

Article type
Paper
Submitted
22 aug 2021
Accepted
06 jan 2022
First published
07 jan 2022
This article is Open Access
Creative Commons BY license

Environ. Sci.: Atmos., 2022,2, 279-290

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

J. Yun, E. Evoy, S. E. Worthy, M. Fraser, D. Veber, A. Platt, K. Rawlings, S. Sharma, W. R. Leaitch and A. Bertram, Environ. Sci.: Atmos., 2022, 2, 279 DOI: 10.1039/D1EA00068C

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