Human activities are altering a range of environmental conditions, including atmospheric CO2 concentration, climate, and nutrient inputs. However, understanding and predicting their combined effect on ecosystem structure and functioning and biogeochemical cycles is challenging. Divergent future projections of terrestrial ecosystem models reflect open questions about fundamental processes and missing observational constraints. Models are routinely tested and calibrated against data from ecosystem flux measurements, remote sensing, atmospheric inversions and ecosystem inventories. While these constrain the current mean state of the terrestrial biosphere, they provide limited information on the sensitivity of ecophysiological, biogeochemical, and hydrological processes to environmental changes. Observational and ecosystem manipulation studies (e.g., Free-Air Carbon Dioxide Enrichment (FACE), nutrient addition or warming experiments) can provide unique insights and inform model development and evaluation.

This session focuses on how ecosystem processes respond to changes in CO2 concentration, atmospheric conditions, water and nutrient availability. It aims at fostering the interaction between experimental and modelling communities by advancing the use of observational and experimental data for model evaluation and calibration. We encourage contributions from syntheses of multiple experiments, model intercomparisons and evaluations against ecosystem manipulation experiments, pre-experimental modelling, or the use of observations from "natural experiments". Contributions may span a range of scales and scopes, including plant ecophysiology, soil organic matter dynamics, soil microbial activity, nutrient cycling, plant-soil interactions, or ecosystem dynamics.

Convener: Benjamin Stocker | Co-conveners: Teresa Gimeno, Karin Rebel, Sönke Zaehle
| Wed, 10 Apr, 14:00–18:00
Room 2.31
| Attendance Wed, 10 Apr, 10:45–12:30
Hall A

Wednesday, 10 April 2019 | Room 2.31

Chairperson: Benjamin Stocker, Teresa Gimeno
14:00–14:15 |
| solicited
Belinda Medlyn, Mingkai Jiang, Kristine Crous, Martin De Kauwe, David Ellsworth, Benjamin Smith, and Sönke Zaehle
14:15–14:30 |
Johanna Pihlblad, Catriona Macdonald, Louise C. Andresen, David Ellsworth, and Yolima Carrillo
14:30–14:45 |
Christiana Dietzen, Klaus Steenberg Larsen, Per Ambus, Marie Arndal, Claus Beier, Sabine Reinsch, and Inger Kappel Schmidt
14:45–15:00 |
Ari Laurén, Mari Lappalainen, Antti-Jussi Kieloaho, Kristiina Karhu, and Marjo Palviainen
15:15–15:30 |
Tea Thum, Silvia Caldararu, Lin Yu, Melanie Kern, Jan Engel, Marleen Pallandt, Bernhard Ahrens, and Sönke Zaehle
Coffee break
Chairperson: Karin T. Rebel, Sönke Zaehle
16:15–16:30 |
Lisa Wingate, Jérôme Ogée, Aurore Kaisermann, Joana Sauze, Sam Jones, Steven Wohl, Laura Meredith, Mary Whelan, Thomas Launois, and Matthias Cuntz
16:45–17:00 |
Athanasios Paschalis, Simone Fatichi, Jakob Zscheischler, and Philippe Ciais and the INTERFACE TEAM
17:00–17:15 |
Frank Hagedorn, Decai Gao, Jobin Joseph, Joerg Luster, Martin Hartmann, Martina Peters, Alois Zuercher, and Arthur Gessler
17:15–17:30 |
Zsofia R. Stangl, Lasse Tarvainen, Mats Räntfors, Göran Wallin, Nerea Ubierna, and John D. Marshall
17:30–17:45 |
Yunpeng Luo, Tarek EI-Madany, Xuanlong Ma, Gianluca Filippa, Edoardo Cremonese, Solveig Franziska Bucher, Marta Galvagno, Javier Pacheco-Labrador, Oscar Pérez-Priego, Andrew D. Richardson, Markus Reichstein, Annette Menzel, Christine Römermann, and Mirco Migliavacca