Stocker Thomas

Climate and Environmental Physics
Klima- und Umweltphysik

Project Number: 2000-039522
Project Type: Research_Project
Project Duration: 04/01/1994 - 03/31/2017
Funding Source: SNSF ,
Project Leader: Prof. Thomas Stocker
Physikalisches Institut - Klima- und Umweltphysik
Universität Bern
Sidlerstr. 5
3012 Bern
Phone: +41 (0) 31 631 44 62 ; +41 (0) 31 631 44 64
FAX: +41 (0) 31 631 87 42
e-Mail: stocker(at)

related to this project.
for which the project has a relevance.

Research Areas:
Mean change
Major Human Driving Forces
Natural science
Regional scale
Past Global Change
Atmosphere (Processes)
Cryosphere (Processes)
Hydrosphere (Processes)
Coupled Systems and Biogeochemical Cycles (Processes)

other areas of physics
fluid dynamics
climatology, atmospheric physics, aeronomy
other areas of environmental sciences
other areas of physics
other areas of environmental sciences
other areas of physics
climatology, atmospheric physics, aeronomy
hydrology, limnology, glaciology
other areas of environmental sciences
other areas of physics
climatology, atmospheric physics, aeronomy
hydrology, limnology, glaciology
other areas of environmental sciences

polar ice cores, climate dynamics and modelling, paleoclimate, groundwater, stable isotopes in the environment, water cycle, greenhouse gases, radionuclides

Our climate model of reduced complexity (Bern3D) will be developed to contain a very basic representation of the atmosphere in the form of an energy balance. Further development concerns the ocean components of the model which will be supplemented by a surface marine ecosystem model and a sediment model. This model will be used to calculate changes in reservoir ages of radiocarbon during abrupt climate change and many other biogeochemical applications. We will complete our greenhouse gas measurements (CO2, CH4, N2O) on ice samples from the European Project of Ice Coring in Antarctica (EPICA) back to 800,000 years including ice samples from the bottom 70 meters. Some time periods will be measured in high resolution. It is planned to complete the gas extraction device for isotopic composition of CO2 in polar ice. In groundwater hydrology we will address the question of stability of anthropogenic tracers with the combined use of 85Kr and 3H/3He ages. Tracer analyses and age determinations will be performed in various aquifers. Our palette of radionuclides offers various ways to constrain the age of a water sample.

Leading questions:
What is the role of the deep ocean circulation during rapid climate change and during transitions from a glacial to an interglacial?

What is the detailed sequence of climatic changes in different locations during the last 100'000 years?

Are global climate changes always triggered in the Northern Hemisphere or is also the opposite sequence possible and what is the coupling between the two hemispheres?

How did the different carbon reservoirs evolve during the last few hundred years and how are they influenced by future perturbations, and what is the effect of rapid and anthropogenic climate change on the carbon cycle?

How can the measurements of different stable and radioactive isotopes be best combined to yield information about the hydrological cycle and the processes in groundwater systems?

T. Stocker & D. Wright: Rapid transitions of the ocean's deep circulation induced by changes in the surface water fluxes. Nature, 351, 729 - 732, 1991.

T. Stocker: The variable ocean. Nature, 367, 221 - 222, 1994.

T. Blunier et al.: Variations in atmospheric methane concentration during the Holocene epoch. Nature, Vol 374, 46 - 49, 1995.

F. Joos & J. Sarmiento: Der Anstieg des atmosphärischen Kohlendioxids. Phys. B1. 51, 405 - 411, 1995.

Source of Information: NF Import 2017 (22.05.2017)

Last update: 5/22/17
Source of data: ProClim- Research InfoSystem (1993-2018)
Update the data of project: CH-39522

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