News & Events Overview

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2nd (AC)³ Science Conference on Arctic Amplification

Our 2nd (AC)³ Science Conference on Arctic Amplification was held in Bremerhaven from 12 to 14 November, 2018.

Over 110 participants met at Klimahaus Bremerhaven for discussing about the results of the first three years of (AC)³. Well-known international guests presented their work during keynote lectures. The research on Arctic Amplification was presented in various oral presentations mostly by PhD students and young PostDocs and almost 50 scientific posters in five sessions according to the (AC)³ clusters. The “(AC)³ Distinguished Young Investigators Prize” was awarded to three PhD students. Congratulations!

First vernissage of paintings from ACLOUD & PASCAL

A first exhibition of paintings by the graphic designer and illustrator Kerstin Heymach has been shown during the celebration of the 25th anniversary of AWI Potsdam. She accompanied the scientists as part of the team to Longyearbyen and Ny-Ålesund at Spitsbergen in May-June 2017. In the tradition of earlier expedition drawers, her pastels, drawings, sketches, photos and interviews illustrate the beauty of the Nordic landscapes and the difficult work of the researchers and team spirit.

This “Documentary drawings of a scientific expedition to the Arctic” will be published in 2017 and the book can be now ordered (;


DFG status report of German National Committee SCAR/IASC published. More information can be found at DFG website

The EOS (AC)³ overview paper Wendisch et al. 2017 was recently published in the printed August EOS magazine, page 22 – 26.

PR released from AGU for the paper “Increasing frequency and duration of Arctic winter warming events” co-authored by (AC)³ member A. Rinke  (link to paper

On the site “Outreach” we have summarized the most interesting articles of the campaings ACLOUD and PASCAL chronologically.

ACLOUD – Aircraft measurements with Polar 5 & 6 at Longyearbyen/Svalbard



ACLOUD blog:

Further news and flight documentation can be found at our website (here).

PASCAL – Ship measurements with RV Polarstern

Or you may follow us on Twitter #arktis17

We are very pleased that the artist Kerstin Heymach is accompanying our ACLOUD campaign in Longyearbyen/Svalbard. She will look at our often technical and scientific work from another point of view with drawings, pictures and documentation of the field work of artic scientists.

Expeditions-Zeichnen auf Spitzbergen

Ab 29. Mai 2017 nimmt Kerstin Heymach als Zeichnerin für einen knappen Monat an der (AC)³-Expedition auf Spitzbergen/Svalbard teil.

Sie begleitet zeichnerisch, fotografisch und textlich Wissenschaftler der beteiligten Unis Leipzig, Bremen, Köln, des Instituts für Troposphärenforschung (TROPOS) und des Alfred-Wegener-Instituts (AWI) bei ihrer Flugzeug-Kampagne ACLOUD und damit verknüpften Forschungen in Longyearbyen und Ny Alesund.

Sie betreibt dazu einen WordPress-Blog: Wer virtuell ohne kalte Füße mitkommen will: Wer soziale Medien mag, gönnt vielleicht der Seite: ein like und kann auch hier dabei sein.

Kerstin würde sich freuen, wenn Ihr den Blog auch in Eure Communities teilt bzw. weiterschickt.

Expedition drawing on Spitsbergen

Kerstin Heymach will take part, as a droughtswoman, in the (AC)³ Expedition on Spitsbergen/Svalbard for nearly a month, starting from May 29th, 2017.

She accompanies scientists of the contributing universities of Leipzig, Bremen, Cologne, the Institute for Tropospheric Research (TROPOS) and of the Alfred Wegener Institute (AWI) on their aircraft campaign ACLOUD and related research work in Longyearbyen and Ny Alesund by drawing, taking photographs and writing texts.

For that purpose she writes a WordPress blog. For those who want to virtuelly come with her without getting cold feet: Fans of social media could perhaps give a like to the site:  to join her.
Kerstin would be glad if you shared  or passed on this blog to your communities.

Kerstin Heymach
Kerstin Heymach
Kangia Eisfjord Grönland 2004
Kangia Eisfjord Grönland 2004

PR released from EGU for the paper “Polar Amplification” from Marc Salzmann (link to paper):

German version from Uni Leipzig can be found here:

You may also check out the article on

You may check out the latest press release introducing our upcoming campaigns ACLOUD and PASCAL (german).

First balloon tests in Melpitz

Our researches are currently testing their equipment and instruments for the tethered balloon measurements at the TROPOS measurement site in Melpitz, Germany. These tests were also attended and reported by a journalist from “Sächsische Zeitung”. The online arcticle can be found here. The tethered balloon experiment will be conducted during the ice station experiment ABEX within the expedition PASCAL in the Arctic in summer 2017.

Launch of tethered balloon.
Launch of tethered balloon.
Lifted TROPOS balloon mounted with several measurement probes.
Lifted TROPOS balloon mounted with several measurement probes.
TROPOS balloon with circumhorizontal arc.
TROPOS balloon with circumhorizontal arc.
Turbulence probe.
Turbulence probe.
Wind probe.
Wind probe.
Broadband radiation probe
Broadband radiation probe

At the Faculty of Physics and Geosciences the following Junior Professorship has to be filled starting on 1 October 2017:

W1 Junior Professorship Arctic Climate Change (with tenure track leading to W2).

Further information can be found here.

Wendisch et al. recently published an article in EOS on “Understanding Causes and Effects of Rapid Warming in the Arctic” introducing the (AC)³ project. The Article can be downloaded on

The Call for Abstracts for the 1st (AC)³ Science Conference on Arctic Amplification in Bremen, Germany is open from now on until 15 January 2017. Further details can be found here.

Our (AC)³ member Klaus Dethloff, AWI Potsdam, is co-author of a paper recently published in Nature Climate Change: Nonlinear response of mid-latitude weather to the chanching Arctic.

Abstract: Are continuing changes in the Arctic influencing wind patterns and the occurrence of extreme weather events in northern mid-latitudes? The chaotic nature of atmospheric circulation precludes easy answers. The topic is a major science challenge, as continued Arctic temperature increases are an inevitable aspect of anthropogenic climate change. We propose a perspective that rejects simple cause-and-effect pathways and notes diagnostic challenges in interpreting atmospheric dynamics. We present a way forward based on understanding multiple processes that lead to uncertainties in Arctic and mid-latitude weather and climate linkages. We emphasize community coordination for both scientific progress and communication to a broader public.

Reprinted by permission from Macmillan Publishers Ltd: Nature Climate Change, advance online publication, 27 10 2016 (doi:10.1038/nclimate3121).

(AC)³ was officially endorsed by YOPP – The Year of Polar Prediction.

Our (AC)³ members Marion Maturilli and Annette Rinke hold a lecture on “Arctic Climate Change” at the Potsdam Summer School “Dealing with Climate Impacts”. Further information can be found here.

A further award for an outstanding scientist: The Royal Society announced their new members in April 2016, one of them is the Bremer Professor John Philip Burrows from the Insitute of Environmental Physics of the University of Bremen. Further information and a (german) PR can be found here.

Our correponding member Prof. Klaus Dethloff has been elected as a new member of the Leibniz-Soziatät in Berlin. Further information can be found here.

The „Sächsische Zeitung“ (SZ) has published an article on the upcoming Polarstern cruise PS106 in May 2017 within (AC)³ . The article in SZ is available here.

Manfred Wendisch has been invited to give presentations about our (AC)³ Arctic research activities in the framework of the „Lange Nacht der Wissenschaften“ in Leipzig. These presentations were also intended for childrens. Further information can be found here.

The “Leipziger Volkszeitung” (LVZ) has published an article on the recent Kick-off Meeting of (AC)³ at Kloster Nimbschen, Grimma. download here

Journalists from the “Sächsische Zeitung” will give journalistic support to our PASCAL ship cruise PS108 on RV Polarstern. The research editorial team will cover news on the campaign preperations and the Arctic expedition – as a journalist and a “assistant researcher”. Further informoation can be found here.

Great news! The Deutsche Forschungsgemeinschaft (DFG) has approved 15 new SFBs and SFB/TRs including (AC)³. PR can be found here.


PI Planning meeting phase II of (AC)³ and General Assembly

The PI planning meeting for discussion about the second phase of (AC)³ will take place in Bremen from January 15 – 17, 2019.

Further information will follow.

2nd (AC)³ Science Conference on Arctic Amplification

12 – 14 November 2018: Bremerhaven, Germany

It is planned to start the conference with an ice breaker on Monday, 12 Nov, evening. Subsequently there will be also a PhD student event.

Further information can be found here.


PASCAL conference (SynArc)

22 – 24 October 2018: Delmenhorst, Germany

Synergy of physical, biological, and biogeochemical Arctic observations – From the Polarstern expedition PS106 towards MOSAiC

Further information will follow.


PI Planning meeting phase II

The PI planning meeting for discussion about the second phase of (AC)³ will take place in Leipzig from July 3 -4, 2018.

Further information will follow.


Halo-(AC)³ planning workshop

A first Halo-(AC)³ planning workshop for will take place in Berlin, 28 June 2018.

Further information will follow.


“Advancing MOSAiC Science” workshop

The Multidisciplinary driftings Observatory for the Study of Arctic Climate (MOSAiC) Science workshop will take place from May 28 – 01 June, 2018 at the Alfred Wegener Institute in Potsdam.

Further information can be found here.


PAMARCMiP campaign

Polar Airborne Measurements and Arctic Regional Climate Model Simulation Project (PAMARCMiP) starting on March 12 to April 6 2018, Station North, Greenland.


(AC)³ General Assembly 2018 in Leipzig

The 1st annual (AC)³ General Assembly (GA) meeting will take place in Leipzig from 6 – 8 March, 2018 (noon – noon).

Further information here.

There will be additional and supplementary meetings and breakout groups on the following dates:

  • ACLOUD meeting: 5 – 6 March 2018 @ Prager Str. 34, LIM
  • Xcutting breakout groups: 6 March 2018 @ Augustusplatz, Uni Leipzig, 9-11:30 am


Ocean subgroup meeting

2 February 2018, 13:00 – 16:00 @ HGF Geschäftsstelle Berlin, Anna-Louisa-Karsch-Straße 2, 10178 Berlin


27 – 28 November 2017: University of Cologne, Cologne

The 2nd annual (AC)³ General Assembly (GA) meeting will take place in Cologne from November 27 – 28, 2017.

The (AC)³ community will present their scientific highlights from 2017. During breakout group discussion, the (AC)³ participants will report and discuss on onging collaborations with other Cluster groups and upcoming campaigns.

Meeting agenda and additional information ( PDF ).


20 – 21 November 2017: Leipzig

Workshop “ACLOUD & PASCAL model-data synergy”

In order to fully exploit the (AC)³ observations – here with a focus on the first field campaign results
from the ACLOUD & PASCAL campaigns, but open for additional ideas – we plan a dedicated workshop to bring together ACLOUD & PASCAL scientists (observations side) and modellers (from high-resolved / LES modelling to global climate modelling scale), as well as other interested (AC)³ scientists.
A preliminary workshop 14 October 2016 in Leipzig with participants just from different groups
from Universität Leipzig and TROPOS underlined the potential of, and the interest in, such activities.
We plan a first exploratory workshop on this topic a few months after the ACLOUD & PASCAL  campaigns but early enough to still steer the work of (AC)³ PhD candidates in both, modelling and observations fields, and early enough to accomplish meaningful science in the sense of joint  publications across institutes.
We will call for participation from colleagues who really intend to collaborate on specific model-data
synergy projects (in the sense of a workshop, not a conference).

WORKSHOP: Arctic snow, sea ice properties and interaction with the atmosphere

Dates: 6th – 8th of November 2017

Location: AWI Bremerhaven – Glashaus, building F (Bussestraße 24)


On behalf of the Transregional Collaborative Research Center TR 172 “ArctiC Amplification: Climate Relevant Atmospheric and SurfaCe Processes, and Feedback Mechanisms (AC )³“ we cordially invite you to attend the Topical Workshop on “Arctic snow and sea ice properties and interaction with the atmosphere” which will take place in Bremerhaven, Germany from 6 to 7 November 2017. One aim of the topical workshop is to strengthen the goals of the upcoming aircraft campaign PAMARCMiP (April 2018). A preparation meeting of PAMARCMiP will followed the workshop from 7 to 8 November.


Snow and sea ice albedo are essential to quantify the Arctic energy budget. Only small changes in surface albedo can trigger feedback mechanisms which enhance the Arctic sea ice loss. However, the snow and sea ice albedo are influenced by a multitude of parameters, such as snow grain size, black carbon concentration, surface roughness, the presence of leads and melt ponds, snow and sea ice thickness and the presence of clouds. Therefore, the local optical and physical properties of snow and sea ice have to be well characterized. Especially, aerosol particles including black carbon may alter the snow optical properties but still raise scientific questions like: What are the most relevant sources of aerosol particles contribution to the
reduction of snow albedo? How are aerosol particles transported into the Arctic and deposited to the surface? How aerosol particles interact with the cloudy atmosphere and are scavenged or modified along the transport path? These questions can be answered only by a collaborative effort of different types of measurements and modeling activities that together will capture the full picture of snow-atmosphere interactions.


Abstract (1/2 page) submission until: 31 August 2017

Abstract submission to: Andreas.Herber[at]

The number of participants will be limited to 30 people.

Organization Committee: Andreas Herber, Marco Zanatta, André Ehrlich


Monday 6. Nov. 2017 (12:00 – 20:00)

Key Note Speaker: Marie Dumont
Invited Speakers: Evi Jäkel, Larisa Istomina, Marcel Nicolaus

SESSION II Evening POSTER SESSION with drinks and finger food

Tuesday 7. Nov. 2017 (09:00 – 17:00)

Key Note Speaker: Björn Hallvard Samset
Invited Speakers: Bernd Heinold, Makoto Koike, Henrik Skov


Late Afternoon: Visit of Schifffahrtsmuseum and joint dinner

Wednesday 8. Nov. 2017 (09:00 – 12:00)


Afternoon: Visit of research vessel POLARSTERN

4 – 6 October 2017: Albertina, University of Leipzig

4 October: ATM Graduate School  >> Preliminary Agenda (PDF)

5 – 6 October: HALO-(AC)³ Workshop “Sharpening the Science objectives of HALO-(AC)³

We are planning to apply HALO (High Altitude and Long-Range Research Aircraft) in the framework of the envisioned second phase of (AC)³ in March-April of either 2020 (during MOSAiC) or 2021. The objective will be to measure air mass transformations along their way from the inner Arctic to the open Arctic Sea. In particular, vertical profiles observations of meteorological, aerosol, cloud, and radiative energy budget parameters and their transformations along meridional air mass transports over sea ice has been conducted with a positive outcome. However, it is now time to specify and sharpen the scientific objectives of this mission and to write a White Book summarizing the aims. For this purpose we are planning a topical workshop.

Further information will follow soon.

Physical feedback of Arctic PBL, Sea ice, Cloud And AerosoL (PASCAL) with RV Polarstern on cruise leg PS106.1 and PS106.2 starting on May 24 to July 20 2017 from Bremerhaven to Longyearbyen and Tromsö.

You may check out where Polarstern is on:

Weekly cruise reports from Polarstern are available on:

Polarstern blog:


Arctic CLoud Observations Using airborne measurements during polar Day (ACLOUD) starting on May 22 to June 28 2017, Longyearbyen/Svalbard.

Further information can be found on You may also follow our ACLOUD blog on


Come and visit RV Polarstern!

Within the Science Year 2016*17 the research vessel Polarstern, operated by the Alfred Wegener Institute, will be open for the public on 22 and 23 April.

Date and Time

Saturday, 22 April 2017, 11 a.m. until 5 p.m. (ship will close at 4 p.m.)
Sunday, 23 April 2017, 10 a.m. until 4 p.m. (ship will close at 3 p.m.)

Further details can be found at AWI website.

26 – 28 March 2017: University of Bremen, Germany. 1st (AC)³ Science Conference.

The conference will summarize the scientific results obtained during the first year of the
Transregional Collaborative Research Center TR 172 on Arctic Amplification (AC)³, and discuss them in context with the international research community. Distinguished guest speakers will talk about recent highlights and current hypotheses in the field of Arctic climate research. Talks and posters will be presented in five sessions. The “(AC)³ Disthinguished Young Investigators Prizes“ will be awarded. The conference is supposed to promote scientific exchange and identify key tasks to be addressed in near-future Arctic climate research.

 A conference flyer can be downloaded here ( outside / inside ).

Further information

The final conference agenda is available here.

Each conference participant will recieve a printed conference booklet including all general information and abstracts at the registration desk. You may also download a digital pdf version in advance. At the conference site WLAN will be available (for further information please ask the registration desk).

You may register for the evening talk by Sebastian Gerland with subsequent (AC)³ reception seperately using the following link:³-reception/

We are looking forward to welcoming you to our conference in Bremen!

19 -25 March 2017: Hyytiälä, Finland.

The winter school is an advanced course intended for graduate students and researchers who want to receive
up-to-date knowledge on the observation and modeling of clouds and precipitation, with a specific focus on
Arctic and high-latitude clouds. The course is structured around a combination of lectures and hands-on
experience using data from research-grade radars (US DOE ARM and ACTRIS), in situ sensors and state-ofthe-
art models. The course topics include: cloud and precipitation observations (cloud radars, lidars, solar
and microwave radiometers, in situ sensors), cloud modeling, precipitation formation, boundary layer

The winter school announcement, registration and application deadline can be found here.

14 – 16 December  2016: Youth Hostel Riehl, Cologne. PhD Worhshop.

The two-day workshop theme is ‘Getting Started’ and includes topics such as time, self and project management. It will provide you with relevant and helpful tools for your writing process. On the third day, Friday, December 16th, you will have the opportunity to spend some time together, share your experiences within and outside your cluster and possibly make a visit to the observatory for cloud evolution in Jülich. This second part of the workshop will be prepared and organised by you. Robert Rauterkus as one of the docs’ representatives will be coordinating this part of the workshop. Please contact him with your ideas and suggestions on this part (r.rauterkus[at] For details on the workshop, please see below.

Workshop: Getting Started

Trainer: Aleksandra Skoric

Date: December 14th – 16th

Place: Youth Hostel Riehl, Cologne

Accommodation: Youth Hostel Riehl, Cologne

Registration for workshop via mail to Annette Drost  (idrost[at] More details will follow soon.

12 December 2016: University of Leipzig. Colloquia on “Arctic Climate Change” by Deutsche Meteorologische Gesellschaft (DMG). Abstracts and further information can be found here for download (only german).

1 – 2 December 2016: Wissenschaftszentrum, Potsdam. 2nd General Assambly (GA) Meeting. Futher information can be found here.

21 – 22 November 2016 : University of Bremen, Meeting Room U1050, IUP Building NW1, Bremen. Preparation Workshop ACLOUD. Further information can be found here.

1 November 2016: University of Leipzig, Faculty of Physics and Earth Sciences, Linnéstr. 5, Leipzig. Colloquia on “Arctic Climate Change”.

18 – 19 October 2016: University of Bremen. PARMACIMP kick-off meeting.

17 – 18 October  2016: University of Leipzig/TROPOS, Leipzig. ATM “Cloud droplet concentration”. An ATM outline is available here and further programe information can be found in a pdf file. Further ATMs with (AC)³ specific focus will be added in the future.

3 – 7 October 2016: Kjeller (Norway), Ny-Ålesund Atmosphere Flagship work group meetings from NySMAC (Ny-Ålesund Science Managers Committee)

14 – 17 July  2016: University of Leipzig/TROPOS, Leipzig. PhD Workshop on Introduction to Linux/Unix.

9 June 2016, 15:15 – TROPOS, Leipzig. Prof. Dr. Annica Ekman gives a talk “Arctic climate response to regional aerosol emission changes between 1980 and 2005” within the scope of the Leipziger Meteorologisches Kolloqium.

1 June – 2 June 2016 (AC)³ PhD Kick-off Meeting at Kloster Nimbschen, Grimma. Further information can be found here.

30 May – 1 June 2016 (AC)³ Kick-off Meeting at Kloster Nimbschen, Grimma. Further information can be found here.

2 May 2016 – Bremerhaven: Planning Meeting Polarstern PS106

24 April 2016, 10:00 – Faculty of Physics and Earth Science, Leipzig. Prof. Dr. Johannes Quaas gives a Sunday lecture on “Luftverschmutzung, Wolken und der Klimawandel – Global und in der Arktis” (details).

31 March 2016, 15:15 – TROPOS, Leipzig. Dr. Peggy Achtert gives a talk “An overview of atmospheric measurements during recent Arctic cruises with the Swedish icebreaker Oden” within the scope of the Leipziger Meteorologisches Kolloqium. The abstract can be found here.

16 -17 February 2016 – Leipzig. Further information can be found here.

28 -29 January 2016 – Sopot, Poland (link)