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Dates:
01.12 - 02.12.2016  
Venue:
Stockholm, Sweden
Contact person:
Fredrik Charpentier Ljungqvist, This email address is being protected from spambots. You need JavaScript enabled to view it.

PAGES' Euro-Med2k working group will hold a meeting at Stockholm University, Sweden, from 1-2 December 2016.

Logistics

The workshop will take place in seminar room Y23 (the Geo-Science building, part Y, level 2) at Stockholm University.

Participants

Fredrik Charpentier Ljungqvist (Stockholm University – main organizer)
Paul J. Krusic (Stockholm University – co-organizer)
Jürg Luterbacher (Justus Liebig University Giessen – vice-head of PAGES EuroMed2k)
Elena García Bustamante (Universidad de Murcia)
Edward R. Cook (Lamont-Doherty Earth Observatory, Columbia University)
Dominik Fleitmann (University of Reading)
Mary Gagen (Swansea University)
Jesús Fidel González-Rouco (Universidad Complutense de Madrid)
Camilo Andrés Melo Aguilar (Universidad Complutense de Madrid)
Anders Moberg (Stockholm University)
Andrea Seim (University of Gothenburg)
Kristina Seftigen (University of Gothenburg)
Johannes Werner (University of Bergen)
Elena Xoplaki (Justus Liebig University Giessen)
Eduardo Zorita (Institute for Coastal Research, Helmholtz-Zentrum Geesthacht)

Workshop aims

To hold a two-day, product-oriented working meeting for participants to work towards the goal of identifying and documenting summer temperature and drought co-variability across Europe over the past millennium.

This will be accomplished by assessing and comparing:
1. 20th century instrumental temperature and precipitation/drought data
2. gridded tree-ring based temperature and drought reconstructions from 850 CE to the present, and
3. climate model simulations of temperature and precipitation/drought from 850 CE to the present.

The aimed-for article can be considered as the extension of three recent studies:
1) Luterbacher J et al. "European summer temperatures since Roman times", Environmental Research Letters 11 (2016): 024001, doi:10.1088/1748-9326/11/1/024001
2) Ljungqvist FC et al. "Northern Hemisphere hydroclimatic variability over the past twelve centuries", Nature 532 (2016): 94–98
3) Cook ER et al. "Old World megadroughts and pluvials during the Common Era", Science Advances 1 (2015): e1500561

Objectives

- Assess the co-variability, in space and time, of summer temperature and summer drought across Europe since c. 850 CE at inter-annual to sub-centennial time-scales.
- Investigate potential changes in dominating patterns of co-variability vis-à-vis the time-scales chosen.
- Empirically test the hypothesis, suggested by climate model simulations, that northern Europe tends to be wetter in a warmer climate and southern Europe tends to be drier.
- Assess the accuracy and precision of climate models to simulate the summer temperature and summer drought co-variability as found both in 20th century instrumental data and millennium-long tree-ring based reconstructions.
- Investigate and discuss results from cross-spectral analyses of temperature and drought variability in time and space over Europe.

Program

30 November
16.00 - Guided tour (by Fredrik Charpentier Ljungqvist) of the Gold Room (treasury collection) and the Viking exhibition at the Swedish History Museum, Narvavägen 13–17.
19.00 - Dinner at Restaurang Konstnärsbaren, Smålandsgatan 7.

1 December
09.00 - Official start of the workshop. Coffee and fruit will be provided. Short welcome by Earth and Environmental Sciences Section Dean Professor Barbara Wohlfarth.
09.30 - Introductory and workshop outline by Fredrik Charpentier Ljungqvist.
10.30 - Presentation by Paul J. Krusic of research regarding "European streamflow and drought: Continental scale outputs of the hydrological cycle."
12.30 - Lunch at Restaurang Fossilen at the Swedish Museum of Natural History near the campus.
14.00 - Work in smaller groups with different tasks regarding the article.
17.00 - Summing up of the first day’s work.
18.30 - Dinner arranged by Paul J. Krusic at the private historical home of Liston Hill, Djurgårdsvägen 216, Djurgården. Transportation by taxi will be provided.

2 December
09.00 - Open Bolin Centre for Climate Research lecture by Professor Jürg Luterbacher about "The Tambora eruption in April 1815 and the ‘year without a summer’ 1816" in William-Olssonsalen, Geo-Science building. Coffee and fruit will be provided.
10.15 - Continued work in smaller groups.
12.30 - Lunch at the Faculty Club, Stockholm University.
14.00 - Reports/presentations from the smaller groups and general discussion about the progress made.
16.00 - Discussion of the future of EuroMed2k and its activities and collaborations after the working group has been officially dissolved by the new year.
17.30 - End of workshop.

Post-meeting material

euromed2k dec 16

Group photo from the workshop dinner.