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 our project will strive to answer.
To do so, we have conducted unique measurements during a 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 took place throughout the most active period biologically and into the autumn freeze-up (mid July to September), I/B Oden drifted passively whilst moored to an ice floe.
Projects at ACES
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 with contributions from Julia Schmale, Paul Scherrer Institute, see link here)
- Cloud-water and aerosol sampling using a tethered balloon (PI: Paul Zieger and Matthew Salter)
The ACES-Team on board Oden will be Linn Karlsson, Julika Zinke, Matt Salter and Paul Zieger. Start will be July, 31st, 2018 (Longyearbyen, Svalbard) and end on September 25th, 2018 (Tromsö, Norway).
Project 1: Aerosol-cloud interactions in the High Arctic
Aerosol and cloud sampling will be performed on the 4th deck using a newly designed whole-air inlet and a special cloud inlet (called the counterflow virtual impactor inlet / CVI), which just samples cloud droplets. Ambient particles and cloud droplets are then dried and characterized using various in-situ instruments. We will use instrumentation to determine the size and chemical composition of the particles. One focus will be the contribution of biogenic particles for which we will use a newly developed bioaerosol sensor. A schematic overview is depicted in the figure below.
Julia Schmale and Andrea Baccarini (Paul Scherrer Institute, PSI, Switzerland) will contribute by characterizing the role of new particle formation in the high Arctic and by performing high-resolution chemical analysis of cloud condensation nuclei. Their instrumentation will be located in the red Swiss container next to the triplet container on the 4th deck.
Here is a short time lapse showing our inlets while Oden is breaking the ice:
Project 2: Sampling of cloud-water and aerosols using a tethered balloon
We have developed a new instrument to sample the cloud droplets and ice crystals of elevated clouds in the high Arctic. The samples (or the cloud water) will later be analyzed in the laboratory with respect to the chemical composition and the ability to form ice nuclei. The mini-CWS (miniaturized cloud water sampler) has been deployed on a tethered balloon during the expedition.
Project 3: Sampling at the open leads
One highlight will be the sampling of particles originating from bubble bursting in the open leads. For this purpose, we have designed a floating chamber which is based on the sea spray chamber in our lab at ACES. Particles will characterized concerning their size and chemical composition (filter sampling).
Media coverage and outreach
- July 2018: Radio interview with Matt on Swedish radio
- October 2018: Radio feature by Helen Czerski on BBC4
- September 2018: Article in the Guardian by Helen
- September 2018: Article on EGU blog, The puzzle of high Arctic aerosols by Julia
- August 2019: Postcard from the field in AGU’s EOS magazine by Paul (see last page in EOS)
Talks and presentations
- Talks at English School in Nacka and for English school IES in Täby (at SU), Aerosol and cloud research in the Arctic: Report from the US-Swedish icebreaker expedition to the North Pole by Paul (November 2018)
- Talk at the Bolin Centre Science Seminar, Aerosol-cloud interactions in the Arctic -Recent results from our observations on Svalbard and the high Arctic by Paul (March 2019)
- Talk at the 3rd Arctic Ocean workshop in Stockholm, Aerosols and clouds in the high Arctic -Recent results from the Arctic Ocean 2018 expedition by Paul (March 2019)
- Talk during Earth Week at Stockholm University, Arctic research at ACES – Recent results from our aerosol-cloud observations on Svalbard and the high Arctic by Paul (May 2019)
- Invited talk at MetNo and University of Oslo (Norway), Aerosol-cloud interactions in the Arctic -Recent results from our observations on Svalbard and the high Arctic by Paul (May 2019)
Previous media material
More information can be found on social media using the hashtag #ArcticOcean2018 (e.g. on Twitter or Instagram) and on the the expedition website on Polarforskningsportalen. Matt will tweet live here. Paul will post on Instagram and for SU (end of September). The press release from Stockholm University can be found here. Helen Czerski is blogging here, while Julia and Andrea will share updates on this site.
A short video about the upcoming Arctic Ocean 2018 expedition prepared by Stockholm University:
Video from our test flights at Cardington (U.K.) of the mini-CWS together with Ian and Grace from Leeds University: