What are the consequences of the dramatic loss of summer sea-ice for Arctic climate? Will the ice continue to disappear at an ever-increasing rate as the exposed ocean surface absorbs increasing amounts of solar radiation? Or might conditions become progressively more favorable for biological activity and associated cloud-formation, decreasing the amount of solar-radiation received at the surface? How might the Arctic climate change on inter-annual and inter-decadal time scales and quite how sensitive is it to anthropogenic climate change? These are key questions that the Microbiology-Ocean-Cloud-Coupling in the High Arctic (MOCCHA 2018 campaign) project will strive to answer.

To do so, we will conduct unique measurements during a planned research cruise to the high Arctic in summer 2018 aboard the Swedish icebreaker (I/B) Oden as part of the Arctic Ocean 2018 expedition. During the cruise, which will take place throughout the most active period biologically and into the autumn freeze-up (mid July to September), I/B Oden will drift passively whilst moored to an ice floe. This approach will allow us to utilize a number of innovative techniques and novel measurement approaches and the project will involve contributions from across many fields in the natural sciences.

Within ACES, we are responsible for the following projects during the expedition:

  • Quantifying the source of aerosols from open leads in the High Arctic (PI: Matthew Salter)
  • Aerosol-cloud interactions in the High Arctic (PI: Paul Zieger)
  • Cloud-water and aerosol sampling using a tethered balloon (PI’s: Paul Zieger and Matthew Salter)



Schematic set-up of the Arctic Ocean 2018 expedition on board the icebreaker Oden (Picture: P. Zieger).


The project at Stockholm University is a collaboration between ACES and MISU. Our international partners are from the University of Leeds (Ian Brooks, Ben Murray, Grace Porter, Mike Adams), the Paul Scherrer Institute (Julia Schmale, Andrea Baccarini), the University of Leipzig (Matthias Gotschalk, Manfred Wendisch), the University of Oldenburg (Oliver Wurl, Brandy Robinson), University College London (Helen Czerski) and Dalhousie University (Patrick Duplessis, Rachel Chang).

Project Info

Project start: 2017

Funded by

The Swedish Polar Research Secretariat, the US National Science Foundation (NSF) and Vetenskapsrådet (VR).