The oceans seem to produce significantly more isoprene, and consequently affect stronger the climate than previously thought. This emerges from a study by the Institute of Catalysis and Environment in Lyon (IRCELYON, CNRS / University Lyon 1) and the Leibniz Institute for Tropospheric Research (TROPOS), which had studied samples of the surface film in the laboratory. The results underline the global significance of the chemical processes at the border between ocean and atmosphere, write the researchers in the journal Environmental Science & Technology.
Isoprene is a gas that is formed by both the vegetation and the oceans. It is very important for the climate because this gas can form particles that can become clouds and then later affect temperature and precipitation. Previously it was assumed that isoprene is primarily caused by biological processes from plankton in the sea water.
The atmospheric chemists from France and Germany, however, could now show that isoprene could also be formed without biological sources in surface film of the oceans by sunlight and so explain the large discrepancy between field measurements and models. The new identified photochemical reaction is therefore important to improve the climate models.
The oceans not only take up heat and carbon dioxide from the atmosphere, they are also sources of various gaseous compounds, thereby affecting the global climate. A key role is played by the so-called surface microlayer (SML), especially at low wind speed. In these few micrometers thin layer different organic substances such as dissolved organic matter, fat and amino acids, proteins, lipids are accumulating as well as trace metals, dust and microorganisms.
For the now published study, the research team took samples from the Norther Atlantic Ocean. The surface film was collected in the Raunefjord near Bergen in Norway. For this purpose, a glass plate is immersed in water and then again carefully pulled from the water. The 200 micron thin film sticks to the glass and is then scraped off with a wiper.
The sample thus obtained is analyzed in the laboratory later. At the Institute of Catalysis and Environment in Lyon (IRCELYON), which belongs to the French research organization CNRS and the University of Lyon 1, the team investigated its photochemical properties during which collected samples were irradiated with light and the gases were analyzed: it became clear that isoprene was produced in magtnetudes that were previously attributed solely to plankton.
"We were able for the first time trace back the production of this important aerosol precursor to abiotic sources, so far global calculations consider only biological sources," explains Dr. Christian George from IRCELYON.
Thus, it is now possible to estimate more closely the total amounts of isoprene, which are emitted. So far, however, local measurements indicated levels of about 0.3 megatonnes per year, global simulations of around 1.9 megatons per year. But the team of Lyon and Leipzig estimates that the newly discovered photochemical pathway alone contribute 0.2 to 3.5 megatons per year additionally and could explain the recent disagreements.
"The existence of the organic films at the ocean surface due to biological activities therefore influences the exchange processes between air and sea in a unexpected strong way. The photochemical processes at this interface could be a very significant source of isoprene", summarizes Prof. Hartmut Herrmann from TROPOS.
The processes at the boundary between water and air are currently of great interest in science: In August, the team from the CNRS and TROPOS presented evidence in Scientific Reports, the open-access journal of Nature, that dissolved organic material in the surface film is strengthening the chemical conversion of saturated fatty acids into unsaturated gas phase products under the influence of sunlight.
For the first time it was realized that these products have to be of biological origin not only, but also abiotic processes at the interface between two media have the potential to produce such molecules. In early September another team from Canada, the US, Great Britain and Germany showed in the journal Nature that organic material from the surface film of the oceans can be an important source for the formation of ice in clouds over remote regions of the North Atlantic, North Pacific and Southern Ocean.
The recent publication of the teams from CNRS and TROPOS in Environmental Science & Technology provides indications how the climate models in the important details of the influence of isoprene could be improved. Because of the great importance this paper will be open access as "Editor's Choice".
Raluca Ciuraru, Ludovic Fine, Manuela van Pinxteren, Barbara D'Anna, Hartmut Herrmann, and Christian George (2015): Unravelling new processes at interfaces: photochemical isoprene production at the sea surface. Environmental Science & Technology. Just Accepted Manuscript
http://dx.doi.org/10.1021/acs.est.5b02388The study was funded by the European Research Council ERC (ERC Grant Agreement 290852 - Airsea).
Raluca Ciuraru, Ludovic Fine, Manuela van Pinxteren, Barbara D’Anna, Hartmut Herrmann & Christian George (2015): Photosensitized production of functionalized and unsaturated organic compounds at the air-sea interface. Scientific Reports, 5:12741, DOI: 10.1038/srep12741
http://dx.doi.org/10.1038/srep12741The study was funded by the European Research Council ERC (ERC Grant Agreement 290852 - Airsea).
Dr. Christian George (en. + fr.)
Institut de Recherches sur la Catalyse et l'Environnement de Lyon (IRCELYON)
Tel: +33-(0)472 44 54 92
Prof. Dr. Hartmut Herrmann, Dr. Manuela van PinxterenLeibniz Institute for Tropospheric Research (TROPOS)
Tel. +49-341-2717-7024, -7102
Tilo Arnhold, public relation of TROPOS
Climat : l’impact des réactions à la surface des océans sur l’atmosphère (press release of CNRS in French)
METEOR expedition „BioChemUpwell“ takes a close look at upwelling zones in the Baltic Sea (Press release of 23rd Juli 2015)
The Leibniz Association connects 89 independent research institutions that range in focus from the natural, engineering and environmental sciences via economics, spatial and social sciences to the humanities. Leibniz Institutes address issues of social, economic and ecological relevance. They conduct knowledge-driven and applied basic research, maintain scientific infrastructure and provide research-based services. The Leibniz Association identifies focus areas for knowledge transfer to policy-makers, academia, business and the public. Leibniz Institutes collaborate intensively with universities – in the form of “WissenschaftsCampi” (thematic partnerships between university and non-university research institutes), for example – as well as with industry and other partners at home and abroad. They are subject to an independent evaluation procedure that is unparalleled in its transparency. Due to the institutes’ importance for the country as a whole, they are funded jointly by the Federation and the Länder, employing some 18,100 individuals, including 9,200 researchers. The entire budget of all the institutes is approximately 1.64 billion EUR. http://www.leibniz-association.eu
Tilo Arnhold | Leibniz-Institut für Troposphärenforschung e. V.
Greenland ice flow likely to speed up: New data assert glaciers move over sediment, which gets more slippery as it gets wetter
17.08.2017 | Swansea University
Climate change: In their old age, trees still accumulate large quantities of carbon
17.08.2017 | Universität Hamburg
Whether you call it effervescent, fizzy, or sparkling, carbonated water is making a comeback as a beverage. Aside from quenching thirst, researchers at the University of Illinois at Urbana-Champaign have discovered a new use for these "bubbly" concoctions that will have major impact on the manufacturer of the world's thinnest, flattest, and one most useful materials -- graphene.
As graphene's popularity grows as an advanced "wonder" material, the speed and quality at which it can be manufactured will be paramount. With that in mind,...
Physicists at the University of Bonn have managed to create optical hollows and more complex patterns into which the light of a Bose-Einstein condensate flows. The creation of such highly low-loss structures for light is a prerequisite for complex light circuits, such as for quantum information processing for a new generation of computers. The researchers are now presenting their results in the journal Nature Photonics.
Light particles (photons) occur as tiny, indivisible portions. Many thousands of these light portions can be merged to form a single super-photon if they are...
For the first time, scientists have shown that circular RNA is linked to brain function. When a RNA molecule called Cdr1as was deleted from the genome of mice, the animals had problems filtering out unnecessary information – like patients suffering from neuropsychiatric disorders.
While hundreds of circular RNAs (circRNAs) are abundant in mammalian brains, one big question has remained unanswered: What are they actually good for? In the...
An experimental small satellite has successfully collected and delivered data on a key measurement for predicting changes in Earth's climate.
The Radiometer Assessment using Vertically Aligned Nanotubes (RAVAN) CubeSat was launched into low-Earth orbit on Nov. 11, 2016, in order to test new...
A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.
Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...
16.08.2017 | Event News
04.08.2017 | Event News
26.07.2017 | Event News
17.08.2017 | Physics and Astronomy
17.08.2017 | Earth Sciences
17.08.2017 | Physics and Astronomy