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Kohlenstoffkreislauf-Forschung auf dem Jungfraujoch

English title Carbon Cycle Research at Jungfraujoch
Applicant Leuenberger Markus
Number 124932
Funding scheme Project funding (Div. I-III)
Research institution Klima und Umweltphysik Physikalisches Institut Universität Bern
Institution of higher education University of Berne - BE
Main discipline Other disciplines of Physics
Start/End 01.04.2009 - 31.03.2011
Approved amount 222'941.00
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All Disciplines (2)

Other disciplines of Physics
Other disciplines of Environmental Sciences

Keywords (7)

Carbon cycle; Carbon Dioxide; Water cycle; Jungfraujoch; water isotopes; mass independent fractionation; Stratospheric Tropospheric Exchange

Lay Summary (German)

Lay summary

). Solche Isotopenbestimmungen stellen einen zusätzlichen Indikator für diese Quellenzuordnung dar. Vorstudien zu Variationen der Wasserdampfisotope werden auf dem Jungfraujoch durchgeführt werden. Das Ziel dabei ist, die Variabilität der Wasserdampfisotopen auf Wolkenbildungshöhe zu charakterisieren.2 Variationen wesentlich geringer sind. Diese kontinuierlichen Konzentrationsmessungen werden durch diskrete Flaschenmessungen kontrolliert und mit weiteren Messungen ergänzt (Isotopenbestimmungen an CO2 Variationen auf die verschiedenen Quellen erlaubt. Es geht in dieser Studie jetzt darum herauszufinden, ob dies auch auf dem Jungfraujoch gelingt, wo die CO2. Messungen in Bern haben gezeigt, dass diese Methodik eine Aufteilung der CO2 pro mol CO2. Der Austausch mit der Biosphäre hat ein Verhältnis von ungefähr 1.1 mol O2 pro mol CO2 zu erhalten, für den heutigen globalen fossilen Brennstoffmix allerdings nur ungefähr 1.4 mol O2 um 1 mol CO2) prozessabhängig sind. So braucht es für die Methanverbrennung (Erdgas) 2 mol O2/CO2 gemacht werden, da deren Verhältnisse (O2 gebraucht wird. Durch die gleichzeitige Messungen beider Konzentrationen können Aussagen über die Herkunft des CO2, O2) ist von Interesse, da bei der Verbrennung von fossilen Brennstoffen zu CO2 auf dem Jungfraujoch durchzuführen. Insbesondere die Sauerstoff Konzentration (O2. Diese Studie hat das Hauptziel Messungen von assozierten Variablen zu CO2 Konzentration in der Atmosphäre ergibt eine Erhöhung der Erdtemperatur über die Treibhausgas-Wirkung von CO2) in der Atmosphäre. Diese zunehmende CO2Der wachsende Verbrauch von fossilen Brennstoffträgern führt zu einer Zunahme des Kohlendioxids (CO

Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants


Associated projects

Number Title Start Funding scheme
116540 Klima- und Umweltphysik 01.04.2007 Project funding (Div. I-III)
136273 CarboCount CH: Quantifying greenhouse gas fluxes and their sensitivity to climate variations: A case study in Central Europe and Switzerland 01.01.2012 Sinergia
135152 Klima- und Umweltphysik 01.04.2011 Project funding (Div. I-III)
134641 Kohlenstoffkreislauf-Forschung auf dem Jungfraujoch 01.04.2011 Project funding (Div. I-III)


Preamble: The High Altitude Research Station at Jungfraujoch is widely recognised as an important research station. It is for example a primary site in the Network for the Detection of Atmospheric Composition Change (NDACC), and was recently selected as one of the 24 Global Atmosphere Watch stations (GAW). The 75th anniversary of research at Jungfraujoch could be celebrated in 2006. The director of the international foundation known today as "High Altitude Research Stations Jungfraujoch and Gornergrat, HFSJG", Prof. Dr. Erwin Flückiger, is going into retirement from his University position in February 2009 and therefore will also resign as director of the foundation in the near future. His designated successor is Prof. Dr. Markus Leuenberger. The research priorities of Prof. Flückiger have been in the field of solar and galactic cosmic rays and were funded by SNF proposal (200020-113704) ending in January 2009. Prof. Leuenberger's research priority at Jungfraujoch is the understanding of Earth's system processes, in particular climate related studies of major air components [Leuenberger and Flückiger, 2008].Climate change is driven primarily by carbon dioxide emissions from fossil fuel consumption and land use changes. During the last decade a small CO2 monitoring network was developed in Europe. A comparison between model estimates and network data have clearly identified two shortcomings: (i) More high resolution data are required combined with related tracers such as CO, CH4, O2, Ar and corresponding isotopes to improve the partitioning of measured CO2 variations into either oceanic, biospheric or anthropogenic contributions. (ii) Transport modelling is a major limitation for an exact explanation of CO2 variations. This proposal is oriented to these issues by addressing two topics that are closely linked, i.e. A) Measurements of carbon dioxide and associated tracers and B) Tracing Stratosphere Troposphere Exchange (STE) by water isotope measurements. CO2 measurements on Jungfraujoch that commenced in late 2000 will be complemented by associated tracers as mentioned above. Particular focus will be given to continuous O2 measurements, discrete analyses on flask samplings for Ar/N2 ratios and for isotope compositions on CO2 and the major air components. Questions related to those measurements are: How variable is the carbon oxidation ratio based on measurements from Jungfraujoch? What are the dominating processes driving the observed CO2 and O2 variations as monitored at Jungfraujoch, are they more biosphere or ocean related? What is the origin of inter-annual variation for CO2 and O2? How do CO2 and O2 trends compare to other sites over longer time periods (decades)?Isotope measurements of discrete precipitation (rain/snow) as well as on water vapour samples from Jungfraujoch will be performed using a new water to oxygen conversion device available at the Climate and Environmental Physics Division of the Physics Institute of the University of Bern. Emphasis will be on deviations between the oxygen isotopes (D17O) due to mass-independent fractionation processes. Those discrete samplings will be complemented by continuous observations of the water isotopes during precipitation events using a state-of-the-art laser system based on wavelength scanned cavity ring down spectroscopy. Burning questions that will be addressed are: Is it possible to detect small changes in D17O at Jungfraujoch? If yes, are those variations in agreement with stratospheric air intrusions as estimated from ozone levels or potential vorticity criteria? Do isotope data from the high-elevation site Jungfraujoch differ from those of the Swiss National Network for the Observation of Isotopes in the water cycle run by the host division?Both topics naturally extend the paleoclimate related research performed at the Climate and Environmental Physics division. The first topic allows us to compare today's atmospheric CO2 variations from a unique observational site with those reconstructed from ice cores and the second topic is closely linked to our long-term involvement in water cycle research.This proposal seeks financial support for part of the research done at Jungfraujoch by the group of Prof. Leuenberger from the Division of Climate and Environmental Physics. Monitoring of CO2 concentrations at Jungfraujoch is not part of this budget since a long term financial support was granted by the Federal Government through GCOS Schweiz in 2008.