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Home / Articles and Press Releases / Press Release / Rare Traces of a Volatile Gas

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Press Release

Rare Traces of a Volatile Gas

By GEOMAR Helmholtz Centre for Ocean Research Kiel

| Read Bio

Published: January 25th, 2018

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The gas nitrogen monoxide (NO) belongs to the group of nitrogen oxides which are infamous as toxic emissions in urban agglomerations. But NO is also produced in nature and plays a role in the nitrogen cycle, which is essential for most organisms. However, from earth’s largest ecosystem, the ocean, we have hardly any NO measurements so far. Researchers from the GEOMAR Helmholtz Centre for Ocean Research Kiel and the Collaborative Research Center (SFB) 754 now have published new NO concentration data from the eastern tropical South Pacific Ocean in the international journal Deep-Sea Research Part II, for which a newly developed measuring method was used for the first time.

Nitrogen oxides — i.e. nitrogen compounds with varying amounts of oxygen — have a very bad reputation. They are produced among other things by burning fossil fuels. In regions with heavy traffic and a lot of industry, they occur in high concentrations and are made responsible for a large number of diseases of the respiratory system. However, nitrogen oxides also occur in nature. There they play an important role in the nitrogen cycle, which ensures that nitrogen, essential for life, is available in forms that the organisms can process.

One of these nitrogen oxides is nitrogen monoxide (NO). Where it is produced in nature and in which quantities is hardly known. It is very volatile and reacts quickly with other substances. Therefore, NO is difficult to measure, especially in the world’s largest ecosystem, the ocean. In the past few years, researchers at the GEOMAR Helmholtz Centre for Ocean Research Kiel have developed a new measurement method and used them during an expedition of the Collaborative Research Center (SFB) 754 “Climate-Biogeochemical Interactions in the Tropical Ocean” in the eastern tropical South Pacific Ocean. Now, they have published the first results in the international journal Deep-Sea Research Part II. “We have been able to demonstrate a clear link between low oxygen concentrations and the production of NO,” says Hannah Lutterbeck, first author of the study.

The new NO-data set is the first since 30 years. “There have been some attempts to measure oceanic NO in the 1980s, but the procedure was extremely complex and resulted in comparatively few data points,” explains co-author Prof. Dr. Hermann Bange from GEOMAR. Since then, research has hardly dealt with the topic of NO in seawater — until Hannah Lutterbeck has taken up the topic again for her PhD thesis.

The special trick of the new method: Water samples are pumped from the depth directly on board and analyzed immediately. “Only by means of quick processing directly on board the research vessel, we have obtained good results. If the water samples are stored for only a few minutes before analysis, the results can already be distorted,” explains Hannah Lutterbeck, who now works at the State Office for Agriculture, Environment and Rural Areas of Schleswig-Holstein.

The expedition, in which the new method has proven itself, was conducted in February and March 2013 in a region off the coast of Peru, where very low oxygen concentrations already occur at 30-50 meters depth. The SFB 754 funded by the German Science Foundation and hosted by Kiel University and the GEOMAR investigates these oxygen minimum zones and their development. “It’s not just a question of whether oxygen depletion in the ocean is increasing, but also how it affects other processes, such as nitrogen and nutrient supply in the ocean,” explains Professor Bange.

The new method of measurement allows marine researchers to add another piece to the puzzle of the many chemical, physical and biological processes in the oxygen minimum zones. “The more details we know, the sooner we understand the phenomenon in its entirety,” says Hermann Bange.

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ABOUT THE AUTHOR

GEOMAR Helmholtz Centre for Ocean Research Kiel

GEOMAR Helmholtz Centre for Ocean Research Kiel is one of the world’s leading institutes in the field of marine sciences. The institute investigates the chemical, physical, biological and geological processes of the seafloor, oceans and ocean margins and their interactions with the atmosphere. With this broad spectrum GEOMAR is unique in Germany. Additionally, the centre has successfully bridged the gap between basic and applied science in a number of research areas. The GEOMAR is a foundation under public law jointly funded by the federal (90 %) and state (10 %) government. GEOMAR has a staff of 1,000 (status on 31 March 2017) and a yearly budget of around 75 Mio. Euro.

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