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Modern digital scientific workflows - often implying Big Data challenges - require data infrastructures and innovative data science methods across disciplines and technologies. Diverse activities within and outside HGF deal with these challenges, on all levels. The series of Data Science Symposia fosters knowledge exchange and collaboration in the Earth and Environment research community. We invited contributions to the overarching topics of data management, data science and data infrastructures. The series of Data Science Symposia is a joint initiative by the three Helmholtz Centers HZG, AWI and GEOMAR Organization: Hela Mehrtens and Daniela Henkel (GEOMAR)

Dates of Cruise: 16.04. – 29.04.2018 Areas of Research: Physical, chemical, biological and fishery oceanography Port Calls: Visby, Sweden, 21. - 22.04.2018

Physical, chemical, biological research and fishery oceanography This multidisciplinary cruise extended a long-term data series on (eco-)system composition and functioning of the Baltic Sea, with a focus on the deeper basins. The series has been collected in similar form since 1986. A key characteristic of the cruise is the integration of oceanographic and biological information to enhance understanding of environmental and (fish) population fluctuations, and evolutionary processes in this system. The resulting datasets and samples feed into the EU projects BONUS BLUEWEBS and Horizon 2020 GoJelly, and the US NSF project "Evolutionary Responses to Global Change in Salinity and Temperature". The spatial focus lay on the Bornholm Basin as most important spawning area of Baltic cod, but also included the Western Baltic Sea, Arkona and Gotland Basin, Gdansk Deep, and Stolpe Trench. Specific investigations included a detailed hydrological survey (oxygen, salinity, temperature) of the Bornholm Basin, plankton surveys (zoo- and ichthyplankton, with the goal to determine the composition and the abundance and vertical and horizontal distribution of species, and to take samples for later measurements of nutritional condition), and pelagic fishery hauls for clupeid and gadoid fish. The latter served to determine stock structure, gonadal maturation, stomach contents, and egg production of sprat and cod, and to sample tissue and otolith samples for individual-level genetic and ecological analyses of cod. The abundance and distribution of fishes in the cruise area was also assessed with hydroacoustic methods. Additional cruise components were: (i) cod gonad sampling for fecundity studies and liver sampling for parasite studies. (ii) vertically resolved phytoplankton and zooplankton sampling for studies of plankton phenology. (iii) in-depth sampling of planktonic food webs for dietary tracer work. (iv) copepode Eurytemora affinis sampling along the salinity gradient of the Baltic Sea for the study of local adapations.

13.4.-28.4.2017 Physical, chemical, biological research and fishery oceanography This multidisciplinary cruise extended a long-term data series on (eco-)system composition and functioning of the Baltic Sea, with a focus on the deeper basins. The series has been collected in similar form since 1986. A key characteristic of the cruise is the integration of oceanographic and biological information to enhance understanding of environmental and (fish) population fluctuations, and evolutionary processes in this system. The resulting datasets and samples are an essential component of the international EU project BONUS BIO-C3 coordinated by GEOMAR. The spatial focus lay on the Bornholm Basin (the most important spawning area of Baltic cod), but also included the Western Baltic Sea, Arkona and Gotland Basin, Gdansk Deep, and Stolpe Trench. Specific investigations included a detailed hydrological survey (oxygen, salinity, temperature) of the Bornholm Basin, plankton surveys (zoo- and ichthyplankton, with the goal to determine the composition and the abundance and vertical and horizontal distribution of species, and to take samples for later measurements of nutritional condition), and pelagic fishery hauls for clupeid and gadoid fish. The latter served to determine stock structure, gonadal maturation, stomach contents, and egg production of sprat and cod, and to sample tissue for later genetic analyses and otoliths for age estimatation of individual cod. The abundance and distribution of fish species in the investigated area was also assessed with hydroacoustic methods. Additional cruise components were: (i) cod gonad sampling for histological and fecundity studies; (ii) vertically resolved phytoplankton and zooplankton sampling for studies of plankton phenology. (iii) vertically and spatially resolved sampling of protist communities for the characteriziation of community structure changes along the salinity gradient of the Baltic Sea.

Physical, chemical, biological research and fishery oceanography This multidisciplinary cruise extended a long-term data series on (eco-)system composition and functioning of the Baltic Sea, with a focus on the deeper basins. The series has been collected in similar form since 1986. A key characteristic of the cruise is the integration of oceanographic and biological information to enhance understanding of environmental and (fish) population fluctuations, and evolutionary processes in this system. The resulting datasets and samples are an essential component of the international EU project BONUS BIO-C3 coordinated by GEOMAR. The spatial focus lay on the Bornholm Basin (the most important spawning area of Baltic cod), but also included the Western Baltic Sea, Arkona Basin, Gdansk Deep, and Stolpe Trench. The planned Gotland Basin stations had to be cancelled on this cruise due to difficult weather conditions. Specific investigations included a detailed hydrographic survey (oxygen, salinity, temperature) of the Bornholm Basin, plankton surveys (zoo- and ichthyplankton, with the goal to determine the composition and the abundance and vertical and horizontal distribution of species, and to take samples for later measurements of nutritional condition), and pelagic and near-bottom fishery hauls for clupeid and gadoid fish. The latter served to determine stock structure, gonadal maturation, stomach contents, and egg production of sprat and cod, and to sample tissue for later genetic analyses, otoliths for age estimatation, and muscle tissue for stable isotope analysis of individual cod. The abundance and distribution of fish species in the investigated area was also assessed with hydroacoustic methods. Additional cruise components were: (i) cod gonad sampling for histological and fecundity studies; (ii) vertically resolved phyto- and zooplankton sampling for studies of plankton phenology.

15.04.2015 - 29.04.2015

13.04. – 27.04.2013 Port Calls: Gdynia, Poland 19. – 21.04.2013

Dates of Cruise: 16.04. - 29.04.2018 Areas of Research: Physical, chemical, biological and fishery oceanography Port Calls: Visby, Sweden, 21. - 22.04.2018

This multidisciplinary cruise extended a long-term data series on ecosystem composition and functioning of the deeper basins of the Baltic Sea that has been collected in similar form since 1987. The key characteristic of the cruise was the integration of oceanographic and biological information to enhance understanding of environmental, plankton dynamics and fish population fluctuations, and ultimately, evolutionary processes in this system. The spatial focus lay on the Bornholm Basin as most important spawning area of Baltic cod, but also included the Western Baltic Sea, Arkona and Gotland Basin, Gdansk Deep, and Stolpe Trench. All objectives of the cruise were achieved, benefiting from perfect weather conditions and flawless performance of all instruments and gear. The detailed hydrological survey (oxygen, salinity, temperature) of the entire cruise area showed higher water temperatures and an improvement of the oxygen situation in deep water layers compared to the same time period in 2018. Plankton surveys (zoo- and ichthyplankton including gelatinous plankton, with the goal to determine the composition and the abundance and vertical and horizontal distribution of species, and to take samples for later measurements of nutritional condition) showed a much higher abundance of jellyfish larvae (?ephyrae?) and small adults than in 2018. Regarding fish larvae, sprat and flounder larvae were abundant but very few cod larvae were present throughout the cruise area, both of which was consistent with the situation in previous years. Pelagic fishery hauls were carried out as planned to determine stock structure and to obtain a range of different samples (gonads, livers, stomachs, tissue samples, otoliths) for cod, whiting, sprat and herring as well as different flatfish species, and are the foundation for a range of different individual-level genetic and ecological analyses to be carried out in the laboratory on land. The abundance and distribution of fishes in the cruise area was also assessed continuously over the duration of the cruise with hydroacoustic methods. As in previous years, cod, herring, sprat and flounder dominated catches. Catches of cod increased compared to 2018, but the absence of large cod individuals in particular in Bornholm Basin was consistent with observations in previous years. Finally, the work for all additional collaborative projects, including in-depth sampling of planktonic food webs for dietary tracer work, sampling and experimental work of photosynthesis and respiration rates of different phytoplankton fractions and finally, pelagic fish stomach and plankton sampling for eDNA assessments was carried out successfully. The resulting data- and sample sets support ongoing projects in the Research Unit Marine Evolutionary Ecology at GEOMAR, as well as the EU Horizon 2020 project GoJelly and several international collaborations.