Atmospheric oxygen and the global carbon cycle. Observations from the new F3 North Sea platform monitoring station and 6 additional locations in Europe and Siberia

Observations of the atmospheric oxygen concentration are a valuable source of information regarding the global carbon cycle and therefore play an important role in current climate research. When the oxygen (O2) and carbon dioxide (CO2) concentrations are measured concurrently, they enable the partitioning of CO2 uptake between the land biosphere and the oceans. In this context a new atmospheric measurement station was established on the production platform F3 in the North Sea. This measurement station is equipped with an automated flask sampler and a setup for continuous O2 and CO2 measurements. This is the first location in the Netherlands where O2 is measured directly in the atmosphere. Measuring O2 is challenging since the absolute variations in the O2 concentration are in the same order of magnitude as for CO2, while the background is much larger. This thesis presents the measurement techniques and the first results from the F3 platform. In the period 2006-2009 the trend was 2.11 ± 0.04 ppm/year for CO2 and -27.1 ± 0.6 per meg/year for O2. The seasonal amplitude was 15.2 ± 0.1 ppm for CO2 and 144 ± 2 per meg for O2. Furthermore this thesis contains the analysis of the seasonal variations, long term trends and gradients of atmospheric samples from flasks filled at 6 different locations in Europe and Siberia. Using renewed insights and observations from Mace Head (Ireland) the CO2 uptake by the global oceans is 1.8 ± 0.8 PgC/year.

	Titel en inhoud
	Hoofdstuk 1
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	Engelse samenvatting
	Nederlandse samenvatting
	Dankwoord
	Curriculum vitae
	Kleuren afbeeldingen
	Volledige dissertatie

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