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In May 2011 we deployed nine 25 m long KOSMOS units for 5 weeks in a Norwegian fjord (Raunefjord, 60.265°N, 5.205°E) close to the city of Bergen, in order to study the influence of ocean acidification on the succession of a plankton community under in-situ conditions. Towards the end of the study (7th of June), we mounted an underwater camera on a diving torch and slowly lowered this setup to a depth of approximately 24.5 m. A variety of different organisms (copepods, fish larvae, jelly fish, appendicularians) and detrital aggregates can be seen during the descent of the camera into the deep. The conical mesocosm sediment trap and particles collected in the funnel can be seen at the end of the video in 25 m water depth. The video shows that we enclosed and studied lively plankton communities within the KOSMOS system. The video can be downloaded on OceanRep but is also available on the KOSMOS channel of the streaming platform YouTube.

In July 2010 the authors observed two mating specimens of Clione limacina (Phipps, 1774) in the surface water of the Arctic Kongsfjord, Svalbard (78° 57.6564' N, 12° 2.55558' E). Clione limacina is a holopelagic gastropod mollusc that belongs to the monophyletic group Pteropoda, which members are characterized by the possession of paired, wing-like appendages. These "wings" constitute a modified gastropod foot and are used for active swimming. Two subgroups of pteropods exist, the shelled Thecosomata and the unshelled Gymnosomata. Gymnosome species are hard to study for a variety of reasons and thus our knowledge on these animals is still very limited, in particular when it comes to behavioral observations. Here we present rare video footage of two mating specimens of Clione limacina, which have been transferred into a plastic bowl for closer observation. Specimens were facing each other on their ventral sides and kept swimming slowly during the whole period. The cephalic copulatory apparatus, which contains a long and slender accessory organ and a penis is everted in both specimens. The free accessory copulatory organs are wrapped around the partner and the penes are inserted into the matesÕ posterior genital opening. The transfer of a spermatophore from the anterior male genital opening along the penis is clearly visible. Fertilization is reported to be reciprocal in this species. Although the mating process has been described previously, the functional physiology of involved anatomical structures (i.e. complex glandular systems) in the formation of the spermatophores and spawn remains obscure.

Folge 4 des Magazins GEOMAR.tv begleitet das Forschungsschiff METEOR auf seiner Jubiläumsfahrt in den Indischen Ozean. Vor Island ziehen Geologen des GEOMAR Bohrkerne aus dem Meeresboden, um mehr über Vulkanausbrüche in der Vergangenheit zu erfahren -- als Basis für Vorhersagen zukünftiger Eruptionen. Teilnehmer des Programms GAME untersuchen, welche Auswirkungen Mikroplastik auf marine Lebewesen hat. Außerdem: Ein Besuch im Aquarium des GEOMAR, das neue Blogportal oceanblogs.org, Artenvielfalt an Kalten Quellen am Meeresboden und das GEOMAR beim Fest zum Tag der Deutschen Einheit in Stuttgart.

Helena, Tim, Melanie und Tim, die sich in ihren Sommerferien langweilen, stolpern über einen Artikel über Sauerstoffminimumzonen. Sie beschließen, verschiedene Meereslebewesen vor Ort zu befragen, was es damit auf sich hat. Bei ihrer Recherche tauchen sie von der Meeresoberfläche bis 500 Meter unter dem Meer ...

AtlantOS aims to improve ocean observing by strengthening international collaboration, sharing of ocean observing and by promoting engagement and innovation. The vision is to create together with the ocean community a coordinated, efficient, sustainable and purposeful system.

By placing a component of the marine environment under controlled conditions, mesocosms provide important links between field studies and laboratory experiments. Project Leader Dr Paolo Simonelli and scientific site coordinators Drs Elin Lindehoff, Jamileh Javidpour, Romain Pete, Stella Berger and Tatiana Tsagaraki explain how they are opening up access to these unique resources for European scientists

Secondary quality control is a process in which data are objectively studied to quantify systematic biases in the measurements. The identified data biases are subjectively compared to predetermined accuracy limits. If the data from the cruise being analyzed show significant bias, this may indicate that an adjustment (either multiplicative or additive) needs to be made to the data, or that there is a systematic problem in the data generation or calibration. It is not recommended that data be adjusted solely on the basis of a secondary QC, but rather that it be stated in the meta-data that there may be a bias and why. At best, the source of the bias will be identified (for example, a problem with the standard used) and corrected. Using this package allows crossover analysis to be performed. Crossover analysis is an objective comparison of deep water data from one cruise with data from other cruises in the same area (e.g., Sabine et al. 1999, Gouretski and Jancke 2001, Johnson et al. 2001, Sabine et al. 2005, Tanhua et al., 2010, see also http://cdiac.esd.ornl.gov/oceans/glodap/crossover.html). The scripts in this package are modified versions of the scripts used by the CARINA project; see Tanhua et al. 2010for more information. An extract of that information is given below.

The FAIR principles (see e.g. https://www.go-fair.org/fair-principles/) currently guide research data management. To assess how FAIR a dataset is, FAIR metrics for data maturity can be evaluated. These figures provide a visual overview of the 41 FAIR metrics specified by the Research Data Alliance (RDA, https://doi.org/10.15497/rda00050).

In austral summer 2017 (coincidently during a coastal El Nino event) we deployed eight KOSMOS mesocosm units (53 m3 each) about 4.5 nm off-shore the Peruvian coastline (-12.0554667°, -077.2347667°). The aim of the study was to gather mechanistic understanding of processes controlling plankton productivity, organic matter export, and particle stoichiometry in the coastal upwelling system off Peru. We collected subsurface waters at two different locations in the regional oxygen minimum zone and injected them into four replicate mesocosms, to compare how upwelling of water masses with different oxygen minimum signature influence plankton succession patterns. This video is meant as an illustration of activities during this interdisciplinary mesocosm study in close cooperation with the Peruvian marine institute IMARPE.