The importance of feldspar for ice nucleation by mineral dust in mixed-phase clouds

  title={The importance of feldspar for ice nucleation by mineral dust in mixed-phase clouds},
  author={James D. Atkinson and Benjamin J. Murray and Matthew T. Woodhouse and Thomas F Whale and Kelly J. Baustian and Kenneth S. Carslaw and Steven Dobbie and Daniel O'Sullivan and Tamsin L. Malkin},
The amount of ice present in mixed-phase clouds, which contain both supercooled liquid water droplets and ice particles, affects cloud extent, lifetime, particle size and radiative properties. The freezing of cloud droplets can be catalysed by the presence of aerosol particles known as ice nuclei. One of the most important ice nuclei is thought to be mineral dust aerosol from arid regions. It is generally assumed that clay minerals, which contribute approximately two-thirds of the dust mass… Expand
Atmospheric science: The seeds of ice in clouds
It is shown here that feldspar minerals dominate ice nucleation by mineral dust, despite being a minor dust component, and it is suggested that fellspar particles may account for a large proportion of ice nuclei in the Earth's atmosphere at certain temperatures, and as feldSpar content can vary, changes in the location of dust sources may alter the concentration of ice nucleus in the atmosphere and the associated climate effects. Expand
Heterogeneous ice nucleation on dust particles sourced from nine deserts worldwide – Part 2: Deposition nucleation and condensation freezing
Abstract. Mineral dust particles from deserts are amongst the most common ice nucleating particles in the atmosphere. The mineralogy of desert dust differs depending on the source region and canExpand
Ice Nucleation Activity of Soil Dust Aerosols
Only a minor, but strongly temperature and humidity dependent fraction of atmospheric aerosol particles act as ice nucleating particles (INPs) and thereby induce primary ice formation in troposphericExpand
Size-dependent ice nucleation by airborne particles during dust events in the eastern Mediterranean
Abstract. The prediction of cloud ice formation in climate models remains a challenge, partly due to the complexity of ice-related processes. Mineral dust is a prominent aerosol in the troposphereExpand
Contribution of feldspar and marine organic aerosols to global ice nucleating particle concentrations
Abstract. Ice-nucleating particles (INPs) are known to affect the amount of ice in mixed-phase clouds, thereby influencing many of their properties. The atmospheric INP concentration changes byExpand
Heterogeneous ice nucleation on dust particles sourced from nine deserts worldwide – Part 1: Immersion freezing
Abstract. Desert dust is one of the most abundant ice nucleating particle types in the atmosphere. Traditionally, clay minerals were assumed to determine the ice nucleation ability of desert dust andExpand
Size-dependent ice nucleation by airborne particles during dust events in the Eastern Mediterranean
Abstract. Predictions of cloud ice formation in climate models remain a challenge, partly due to the complexity of ice-related processes. Mineral dust is a prominent aerosol in the troposphere and isExpand
Organic matter matters for ice nuclei of agricultural soil origin
Abstract. Heterogeneous ice nucleation is a crucial process for forming ice-containing clouds and subsequent ice-induced precipitation. The importance for ice nucleation by airborne desert soil dustsExpand
Ice nucleation by mineral dusts
Heterogeneous ice nucleation in the immersion mode plays a vital, yet poorly understood, role in the development of ice in mixed-phase clouds. From recent work it is thought that mineral dusts areExpand
Active sites in heterogeneous ice nucleation—the example of K-rich feldspars
Direct electron-microscopic observations of deposition growth of aligned ice crystals on feldspar, an atmospherically important component of mineral dust, are reported and molecular-scale computer simulations indicate that this alignment arises from the preferential nucleation of prismatic crystal planes of ice on high-energy surface planes of feldSpar. Expand


Ice nucleation by particles immersed in supercooled cloud droplets.
Aerosol species which have been identified in the past as potentially important ice nuclei are introduced and their ice-nucleating ability when immersed in a supercooled droplet is addressed and the importance of ice nucleation by different aerosol types is estimated. Expand
Immersion mode heterogeneous ice nucleation by an illite rich powder representative of atmospheric mineral dust
Abstract. Atmospheric dust rich in illite is transported globally from arid regions and impacts cloud properties through the nucleation of ice. We present measurements of ice nucleation in waterExpand
A Classical-Theory-Based Parameterization of Heterogeneous Ice Nucleation by Mineral Dust, Soot, and Biological Particles in a Global Climate Model
An ice nucleation parameterization based on classical nucleation theory, with aerosol-specific parameters derived from experiments, has been implemented into a global climate model—the CommunityExpand
Heterogeneous ice nucleation on atmospheric aerosols: a review of results from laboratory experiments
Abstract. A small subset of the atmospheric aerosol population has the ability to induce ice formation at conditions under which ice would not form without them (heterogeneous ice nucleation). WhileExpand
Irreversible loss of ice nucleation active sites in mineral dust particles caused by sulphuric acid condensation
Abstract. During the FROST-2 (FReezing Of duST) measurement campaign conducted at the Leipzig Aerosol Cloud Interaction Simulator (LACIS), we investigated changes in the ice nucleation properties ofExpand
Heterogeneous freezing of water droplets containing kaolinite particles
Abstract. Clouds composed of both ice particles and supercooled liquid water droplets exist at temperatures above ~236 K. These mixed phase clouds, which strongly impact climate, are very sensitiveExpand
A Particle-Surface-Area-Based Parameterization of Immersion Freezing on Desert Dust Particles
AbstractIn climate and weather models, the quantitative description of aerosol and cloud processes relies on simplified assumptions. This contributes major uncertainties to the prediction of globalExpand
African dust aerosols as atmospheric ice nuclei
[1] Measurements of the ice nucleating ability of aerosol particles in air masses over Florida having sources from North Africa support the potential importance of dust aerosols for indirectlyExpand
Quantitative descriptions of ice formation mechanisms of silver iodide-type aerosols
Abstract Laboratory and numerical cloud model experiments were designed to obtain quantitative data describing ice formation by two specific aerosols used operationally for cloud modification.Expand
Ice formation and development in aged, wintertime cumulus over the UK: observations and modelling
Abstract. In situ high resolution aircraft measurements of cloud microphysical properties were made in coordination with ground based remote sensing observations of a line of small cumulus clouds,Expand