EGU24-17179, updated on 11 Mar 2024
EGU General Assembly 2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

Ice nucleating properties of air filter and snow samples taken in the Central Arctic during MOSAiC

Amélie Kirchgaessner, Markus Frey, Floor van den Heuvel, Tom Lachlan-Cope, Ananth Ranjithkumar, and Xin Yang
Amélie Kirchgaessner et al.
  • British Antarctic Survey, Atmosphere, Ice and Climate Team, Cambridge, United Kingdom of Great Britain – England, Scotland, Wales (

Arctic clouds are still poorly represented in climate models. An important reason for this is our lack of knowledge regarding the various sources of natural aerosol in the high Arctic. Recent field campaigns have provided evidence that over sea ice blowing snow can act as a source of sea salt aerosol (SSA). This source can account for the maximum in SSA that occurs in the Polar Regions during winter and spring. SSA can influence the regional climate through the indirect radiative effect, but also through the role it plays as nucleation particle in cloud formation. Its contribution to and potential as ice nucleating particle (INP) is still largely unknown though. 

 Here we will present offline samples of airborne aerosol taken in the Central Arctic during MOSAiC focussing on the transition period from winter to spring. The samples comprise of quasi-ciontinuous low-volume air filter samples taken in the British Antarctic Survey’s aerosol lab container on board of RV Polarstern, weekly snow samples from the ice floe, and filter samples taken by tethered balloon. These samples were analysed for their ice nucleating characteristics using a peltier cold stage and applying a machine learning algorithm to the images taken during the cooling process.

Initial results confirm an increased presence of INP in both the airborne and snow samples at the turn from winter to spring. 

How to cite: Kirchgaessner, A., Frey, M., van den Heuvel, F., Lachlan-Cope, T., Ranjithkumar, A., and Yang, X.: Ice nucleating properties of air filter and snow samples taken in the Central Arctic during MOSAiC, EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-17179,, 2024.