ALBERT

Beschreibung: RV Meteor M197 EMS-PS ('Eastern Mediterranean Sea - Process Study'), 30.12.2023 – 06.02.2024

Beschreibung: RV Meteor M197 EMS-PS ('Eastern Mediterranean Sea - Process Study'), 30.12.2023 – 06.02.2024

Beschreibung: RV Meteor M197 EMS-PS ('Eastern Mediterranean Sea - Process Study'), 30.12.2023 – 06.02.2024

Beschreibung: RV Meteor M197 EMS-PS ('Eastern Mediterranean Sea - Process Study'), 30.12.2023 – 06.02.2024

Beschreibung: RV Meteor M197 EMS-PS ('Eastern Mediterranean Sea - Process Study'), 30.12.2023 – 06.02.2024

Beschreibung: RV Meteor M197 EMS-PS ('Eastern Mediterranean Sea - Process Study'), 30.12.2023 – 06.02.2024

Beschreibung: RV MARIA S. MERIAN MSM126 “Jellyweb Madeira” 9. Februar – 4. März 2024 1. Wochenbericht (9.-11. Februar, 2024)

Beschreibung: RV MARIA S. MERIAN MSM126 “Jellyweb Madeira” 9. Februar – 4. März 2024 2.Wochenbericht (12. – 18. Februar 2024)

Beschreibung: RV MARIA S. MERIAN MSM126 “Jellyweb Madeira” 9. Februar – 4. März 2024 3.Wochenbericht (19. – 25. Februar 2024)

Beschreibung: RV MARIA S. MERIAN MSM126 “Jellyweb Madeira” 9. Februar – 4. März 2024 4.Wochenbericht (26.Februar – 03. März 2024)

Beschreibung: Mass mortality events (MMEs) are defined as the death of large numbers of fish over a short period of time. These events can result in catastrophic losses to the Atlantic salmon aquaculture industry and the local economy. However, they are challenging to understand because of their relative infrequency and the high number of potential factors involved. As a result, the causes and consequences of MMEs in Atlantic salmon aquaculture are not well understood. In this study, we developed a structural network of causal risk factors for MMEs for aquaculture and the communities that depend on Atlantic salmon aquaculture. Using the Interpretive Structural Modeling (ISM) technique, we analysed the causes of Atlantic salmon mass mortalities due to environmental (abiotic), biological (biotic) and nutritional risk factors. The consequences of MMEs were also assessed for the occupational health and safety of aquaculture workers and their implications for the livelihoods of local communities. This structural network deepens our understanding of MMEs and points to management actions and interventions that can help mitigate mass mortalities. MMEs are typically not the result of a single risk factor but are caused by the systematic interaction of risk factors related to the environment, fish diseases, feeding/nutrition and cage-site management. Results also indicate that considerations of health and safety risk, through pre- and post-event risk assessments, may help to minimize workplace injuries and eliminate potential risks of human fatalities. Company and government assisted socio-economic measures could help mitigate post-mass mortality impacts. Appropriate and timely management actions may help reduce MMEs at Atlantic salmon cage sites and minimize the physical and social vulnerabilities of workers and local communities.

Beschreibung: FS METEOR Reise M189, 16.04. – 13.05.2023, Walvis Bay (Namibia) – Walvis Bay (Namibia): 1.Wochenbericht (16.04.2023)

Beschreibung: FS METEOR Reise M189, 16.04. – 13.05.2023, Walvis Bay (Namibia) – Walvis Bay (Namibia): 2. Wochenbericht (17. - 23.04.2023)

Beschreibung: FS METEOR Reise M189, 16.04. – 13.05.2023, Walvis Bay (Namibia) – Walvis Bay (Namibia): 3. Wochenbericht ((24. - 30.04.2023)

Beschreibung: FS ALKOR Ausfahrt AL595 GPF 21-2_037 31.05. – 20.06.2023 Kiel – Island – Kiel AUV@Grimsey Bathymetrische und mikrobiologische Untersuchungen am Grimsey Hydrothermalfeld Wochenbericht Nr.1 31.05. – 05.06.2023

Beschreibung: FS ALKOR Ausfahrt AL595 GPF 21-2_037 31.05. – 20.06.2023 Kiel – Island – Kiel AUV@Grimsey Bathymetrische und mikrobiologische Untersuchungen am Grimsey Hydrothermalfeld Wochenbericht Nr. 2 6.06. – 12.06.2023

Beschreibung: FS ALKOR Ausfahrt AL595 GPF 21-2_037 31.05. – 20.06.2023 Kiel – Island – Kiel AUV@Grimsey Bathymetrische und mikrobiologische Untersuchungen am Grimsey Hydrothermalfeld Wochenbericht Nr.3 13.06. – 19.06.2023

Beschreibung: 06.06. – 29.07.2023, Townsville (Australien) – Singapur

Beschreibung: 06.06. – 29.07.2023, Townsville (Australien) – Singapur

Beschreibung: 06.06. – 29.07.2023, Townsville (Australien) – Singapur

Beschreibung: 06.06. – 29.07.2023, Townsville (Australien) – Singapur

Beschreibung: 06.06. – 29.07.2023, Townsville (Australien) – Singapur

Beschreibung: 06.06. – 29.07.2023, Townsville (Australien) – Singapur

Beschreibung: 06.06. – 29.07.2023, Townsville (Australien) – Singapur

Beschreibung: The Digital Earth Viewer is a tool for the visualisation and exploration of geospatial data in true 3D over time. It runs on Windows, MacOS and Linux and only requires a modern webbrowser to use. Common file formats such as CSV, netCDF, GeoTIFF and many more are natively supported

Beschreibung: TRANSFORMERS II, MARIA S. MERIAN 122 Ponta Delgada – Halifax, 19. Oktober bis 9. November 2023 1. Wochenbericht (19.10.- 22.10.2023)

Beschreibung: TRANSFORMERS II, MARIA S. MERIAN 122 Ponta Delgada – Halifax, 19. Oktober bis 9. November 2023 2. Wochenbericht (23.10.- 29.10.2023)

Beschreibung: TRANSFORMERS II, MARIA S. MERIAN 122, Ponta Delgada – Halifax, 19. Oktober bis 9. November 2023 3. Wochenbericht (30.10.- 05.11.2023)

Beschreibung: MSM123 “BELS” Halifax – St. John’s 23. November – 27. Dezember 2023 2.Wochenbericht (27.11. 2023 - 03.12.2023)

Beschreibung: MSM123 “BELS” Halifax – St. John’s 23. November – 27. Dezember 2023 3.Wochenbericht (04.12.2023 - 10.12.2023)

Beschreibung: MSM123 “BELS” Halifax – St. John’s 23. November – 27. Dezember 2023 4.Wochenbericht (11.12.2023 - 17.12.2023)

Beschreibung: MSM123 “BELS” Halifax – St. John’s 23. November – 27. Dezember 2023 5. Wochenbericht (23.12.2023 - 27.12.2023)

Beschreibung: Expedition SO287 – CONNECT 11.12.2021 - 11.01.2022 Las Palmas-Guayaquil Wochenbericht Nr. 4 27.12.2021- 02.01.2022

Beschreibung: Expedition SO287 – CONNECT 11.12.2021 - 11.01.2022 Las Palmas-Guayaquil Wochenbericht Nr. 5 03. - 10.01.2022

Beschreibung: FS MARIA S. MERIAN - MSM106 (26.02. - 19.03.2022) 2. Wochenbericht (28.2. – 6.3.2022)

Beschreibung: FS MARIA S. MERIAN - MSM106 (26.02. – 19.03.2022) 3. Wochenbericht (07.03. – 13.03.2022)

Beschreibung: FS MARIA S. MERIAN - MSM106 (26.02. - 19.03.2022) 1. Wochenbericht (23. – 27.02.2022)

Beschreibung: Fahrtabschnitt 14.05. - 22.05.2022

Beschreibung: Fahrtabschnitt 30.08. - 04.09.2022

Beschreibung: Las Palmas, Spain - Guayaquil, Ecuador 11.12.2021 - 11.02.2022

Beschreibung: FS Alkor Reise 556, Fahrtabschnitt 14.05. - 22.05.2021 Die Ostsee hat im Rahmen des Klimawandels und wachsender anthropogener Nutzung in den letzten 50 Jahren tiefgreifende und im globalen Vergleich besonders schnell ablaufende Veränderungen, wie Erwärmung, Versauerung, Eutrophierung, zunehmenden Sauerstoffmangel, Überfischung, und die Ausbreitung invasiver Arten, erfahren. Die ökologischen und ökonomischen Konsequenzen dieser langfristigen Veränderungen sind durch kurzfristige Projekte nur schwer zu verfolgen. Umso wichtiger sind Langzeitdatenreihen, die auch dekadische Muster abbilden. Das Hauptziel der Ausfahrt AL556 ist es, durch Probennahmen und hydrographische Messungen eine der besten verfügbaren Langzeitdatenreihen für die pelagische Ostsee fortzusetzen. So wurden seit 1986 in den tiefen Becken der Ostsee mit Hauptfokus auf dem Bornholmbecken mit konsistenter Methodik pelagische Schleppnetzfischerei und Fischprobennahmen, Beprobungen des pelagischen Nahrungsnetzes (Phyto- und Zooplankton einschließlich Ichthyo- und gelatinösem („Quallen“) Plankton), ozeanographische/hydrographische Messungen und Hydroakustikaufnahmen durchgeführt. Diese Arbeiten werden während der AL556 weitergeführt, wobei die Ausfahrt aufgrund einer Corona-bedingten Unterbrechung der Langzeitdatenreihe in 2020 von besonderer Bedeutung ist. Die gewonnenen Proben und Daten sind dabei für verschiedene Projekte und internationale Kollaborationen der Abteilung „Marine Evolutionary Ecology“ am GEOMAR relevant. Dazu gehören insbesondere das Projekt "Fischereiindizierte Evolution" im Rahmen der DFG-Graduiertenschule TransEvo (CAU /GEOMAR), und das EU Horizon 2020 Projektes GoJelly. Sonderprojekte in 2021 sind zudem die Isolation von marinen Viren und der Phytoyplanktonart Ostreococcus für das Projekt Marine Mikroben und Viren der Ostsee unter dem Einfluß des Klimawandels und Probennahmen für die Untersuchung der Nahrungsökologie von Fischlarven und planktivoren adulten Fischen mit Hilfe molekularbiologischer Ansätze („Metabarcoding“).

Beschreibung: 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.

Beschreibung: Global models show generally a large model-data misfit with regard to oxygen. One of the most intense OMZs is located in the Arabian Sea. The scripts serve to give an overview of the main model deficiencies in the Indian Ocean with a detailed comparison of the historical state of ten climate models from the 5th coupled model intercomparison project (CMIP5) that present our present-day understanding of physical and biogeochemical processes.

Beschreibung: CMSY++ is an advanced state-space Bayesian method for stock assessment that estimates fisheries reference points (MSY, Fmsy, Bmsy) as well as status or relative stock size (B/Bmsy) and fishing pressure or exploitation (F/Fmsy) from catch and (optionally) abundance data, a prior for resilience or productivity (r), and broad priors for the ratio of biomass to unfished biomass (B/k) at the beginning, an intermediate year, and the end of the time series. For the purpose of this User Guide, the whole package is referred to as CMSY++ whereas the part of the method that deals with catch-only data is referred to as CMSY (catch MSY), and the part of the method that requires additional abundance data is referred to as BSM (Bayesian Schaefer Model). Both methods are based on a modified Schaefer surplus production model (see paper cited above for more details). The main advantage of BSM, compared to other implementations of surplus production models, is the focus on informative priors and the acceptance of short and incomplete (i.e., fragmented, with missing years) abundance data. This document provides a simple step-by-step guide for researchers who want to apply CMSY++ to their own data.

Beschreibung: With this script, the Meridional Overturning Circulation (MOC) can be computed from NEMO ocean-model output for the whole globe or the Atlantic (AMOC), Indic (IMOC) and Pacific (PMOC) subbasins. The MOC is computable in z- and sigma coordinates. Moreover, for nested configurations, it is possible to combine data from both host and nest grids. Finally, it is possible to take into account of that the ORCA model grid is curvilinear north of 20°N: it is possible to compute the northward velocity component from the velocity field in x- and y- directions and to sum up the meridional flux over latitudional bands instead of in x-direction. When both steps are applied, the resulting MOC shows however strong variability in meridional direction. It needs to be clarified, whether this is realistic or not. The software is provided in the form of the jupyter notebook "MOC.ipynb" which includes more informations on the possibilites of the computations and an extensive appendix section with comparisons to computations with cdftools, as well as with details on the computation of the MOC including nest data and taking the curvilinearity of the grid into account. Necessary python modules are listed at the beginning of the document.

Beschreibung: Expedition SO287 – CONNECT 11.12.2021 - 11.01.2022 Las Palmas-Guayaquil Wochenbericht Nr. 3 20.12. - 26.12.2021

Beschreibung: 19.07. – 27.07.2021, Kiel (Germany) – Kiel (Germany) BALTEACH - 1

Beschreibung: Expedition SO287 – CONNECT 11.12.2021 - 11.01.2022 Las Palmas - Guayaquil 1. Wochenbericht 10.12. - 12.12.2021

Beschreibung: Expedition SO287 – CONNECT 11.12.2021 - 11.01.2022 Las Palmas - Guayaquil 2. Wochenbericht 13.12. - 19.12.2021

Beschreibung: SONNE 284 Mooring Rescue Emden - Emden, 27.06. - 17.08.2021 1. WOCHENBERICHT 27.06. - 04.07.2021

Beschreibung: SONNE 284 Mooring Rescue Emden - Emden, 27.06. - 17.08.2021 5. WOCHENBERICHT 26.07. - 01.08.2021

Beschreibung: SONNE 284 Mooring Rescue Emden - Emden, 27.06. - 17.08.2021 3. WOCHENBERICHT 12.07. - 18.07.2021

Beschreibung: SONNE 284 Mooring Rescue Emden - Emden, 27.06. - 17.08.2021 2. WOCHENBERICHT 05.07. - 11.07.2021

Beschreibung: SONNE 284 Mooring Rescue Emden - Emden, 27.06. - 17.08.2021 6. WOCHENBERICHT 02.08. - 08.08.2021

Beschreibung: SONNE 284 Mooring Rescue Emden - Emden, 27.06. - 17.08.2021 4. WOCHENBERICHT 19.07. - 25.07.2021

Beschreibung: Dates of Cruise: 02.-06.08.2021 Areas of Research: Aquarium West Shore Port Calls: Grenå DK (03.08. - 05.08.2021, 2 nights) Institute: GEOMAR Helmholtz Centre for Ocean Research Kiel Acquisition of living marine organism for the institute’s own aquarium in the northern Kattegat.

Beschreibung: The Net-Zero-2050 cluster aims for a national roadmap for net zero CO2 emissions by 2050, including integrated scenario analyses and negative emission technology assessment (see fact sheet Net-Zero-2050 Structure Project 1). This national target to substantially reduce national CO2 emissions by 2050 stems from the objective to comply with the global long-term temperature goal of well below 2°C of the Paris Agreement (UNFCCC, 2015). Within the cluster it is therefore important to decide on an approach for deriving a national remaining carbon budget from global emissions trajectories in agreement with the Paris Climate Agreement’s longterm temperature goal (UNFCCC, 2015). Allocating national carbon budgets is a balance of environmental effectiveness, equity, national capacity and ability, political feasibility, economic efficiency and technical requirements (Gignac and Matthews, 2015; Höhne et al., 2003; 2014). Given Germany’s capacity and abilities, we decided to follow a sustainable growth trajectory with a convergence phase to equal-per-capita CO2 emissions by 2035, and a net zero CO2 emissions trajectory after 2050 until the end of the century. This approach leads to a remaining Germany CO2 budget of 9 GtCO2 (from 1st January 2018 to 2050 and 2100), which we propose to be used across the Net-Zero-2050 cluster. The remaining carbon budget will serve as a target to be used in all work packages in a concerted way, either qualitatively or quantitatively, and in accordance with other work packages (see also fact sheet Net-Zero-2050 Energy Scenario Approach). The calculated budget is at the lower end of the national budget if allocated by the grandfathering approach (emissions are allocated with respect to today’s emissions shares: 5.5-13.1 GtCO2), but slightly higher than the highest estimate of an equal-per-capita remaining carbon budget (emissions are allocated with respect to Germany’s share of the global population: 3.5-8.4 GtCO2) The 9 GtCO2 national remaining CO2 budget, 6.9 GtCO2 from 1st January 2021, will need to be broken down by category (e.g. energy, land use, industrial processes, and man-made sinks and sources; see Gap Analysis Report) in order to provide a consistent approach across work packages.

Beschreibung: This report is thought as a guide to early hydrographic log sheets of bottle data obtained by the former Institut für Meereskunde, Kiel (IFMK, now integrated into GEOMAR) in the post-war years 1946 to 1956, and which in summer 2018 when a building used by GEOMAR was to clear were not available in digitized format at GEOMAR. The data mostly were taken by the research cutter FK “Südfall” in the Baltic. It turned out that some of these data from 1950 to 1956 were available in digitized form at the on-line data bank of the International Council for the Exploration of the Sea (ICES). Comparison with the original logged data sheets, however, showed that they needed to be improved w/r to time and position and to be completed by missing data. This report shortly describes the methods of sampling and measuring these old data, and the processing steps applied to improve the data set by using the data log sheets before archiving and submitting the now improved and complete data set to data centres for archiving.

Beschreibung: 14.6. – 18.6.2021 Areas of Research: Public relations and aquarium west shore Port Calls: Grena/ DK (15.6. – 17.6.2021) Acquisition of living marine organisms for the public relations division (GEOMAR), the institute’s own aquarium and the Multimar Wattforum - Tönning in the northern Kattegat.

Beschreibung: Cold‐water coral (CWC) reefs and mounds are and have been biodiversity hotspots of the deep sea. As their occurrence depends on specific environmental parameters, gaining hindsight on changing ocean conditions under on‐going climate change is the key to a better understanding of CWC mound development through time. A convenient technique for reconstructing the palaeoenvironment during periods of CWC mound growth is by extracting geochemical proxies from biologically mediated carbonates. Here, the focus is on probably the two most abundant calcareous archives, that are, cold‐water Scleractinia and Foraminifera, with an overview of the geochemical proxies (selection) used in these aragonitic and calcitic skeletons from CWC mounds. A particular emphasis is set on constraining proxies for temperature, salinity, seawater density, seawater carbonate systems parameters (pH, CO 3 2− ), nutrients, oxygen and water mass tracers.

Beschreibung: 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)

Beschreibung: The response of permafrost to submergence can vary between ice-rich late Pleistocene deposits and the thermokarst basins that thawed out during the Holocene. We hypothesize that inundated Alases offshore thaw faster than submerged Yedoma. To test this hypothesis, we estimated depths to the top of ice-bearing permafrost offshore of the Bykovsky Peninsula in northeast Siberia using electrical resistivity surveys. The surveys traversed submerged lagoon deposits, drained and refrozen Alas deposits, and undisturbed Yedoma from the coastline to 373 m offshore. While the permafrost degradation rates of the submerged Yedoma were in the range of similar sites, the submerged Alas permafrost degradation rates were up to 170% faster. Given the abundance of thermokarst basins and lakes along parts of the Arctic coastline, its effect on subsea permafrost degradation must be similarly prevalent. Remote sensing analyses suggest that 54% of lagoons wider than 500 m originated in thermokarst basins.

Beschreibung: Permafrost thaw leads to thermokarst lake formation and talik growth tens of meters deep, enabling microbial decomposition of formerly frozen organic matter (OM). We analyzed two 17-m-long thermokarst lake sediment cores taken in Central Yakutia, Russia. One core was from an Alas lake in a Holocene thermokarst basin that underwent multiple lake generations, and the second core from a young Yedoma upland lake (formed ca. 70 years ago) whose sediments have thawed for the first time since deposition. This comparison provides a glance into OM fate in thawing Yedoma deposits. We analyzed total organic carbon (TOC) and dissolved organic carbon (DOC) content, n-alkanes concentrations, and bacterial and archaeal membrane markers. Furthermore, we conducted one-year-long incubations (4 °C, dark) and measured anaerobic carbon dioxide (CO2) and methane (CH4) production. The sediments from both cores contained little TOC (0.7±0.4 wt%), but DOC values were relatively high, with highest values in the frozen Yedoma lake sediments (1620 mg L-1). Cumulative GHG production after one year was highest in the Yedoma lake sediments (226±212 μg CO2-C gdw-1, 28±36 μg CH4-C gdw-1) and 3 and 1.5 times lower in the Alas lake sediments, respectively (75±76 μg CO2-C gdw-1, 19±29 μg CH4-C gdw-1). The highest CO2 production in the frozen Yedoma lake sediments likely results from decomposition of readily bioavailable OM, while highest CH4 production in the non-frozen top sediments of this core suggests that methanogenic communities established upon thaw. The lower GHG production in the non-frozen Alas lake sediments resulted from advanced OM decomposition during Holocene talik development. Furthermore, we found that drivers of CO2 and CH4 production differ following thaw. Our results suggest that GHG production from TOC-poor mineral deposits, which are widespread throughout the Arctic, can be substantial. Therefore, our novel data are relevant for vast ice-rich permafrost deposits vulnerable to thermokarst formation.

Beschreibung: Thermal erosion is a major mechanism of permafrost degradation, resulting in characteristic landforms. We inventory thermo-erosional valleys in ice-rich coastal lowlands adjacent to the Siberian Laptev Sea based on remote sensing, Geographic Information System (GIS), and field investigations for a first regional assessment of their spatial distribution and characteristics. Three study areas with similar geological (Yedoma Ice Complex) but diverse geomorphological conditions vary in valley areal extent, incision depth, and branching geometry. The most extensive valley networks are incised deeply (up to 35 m) into the broad inclined lowland around Mamontov Klyk. The flat, low-lying plain forming the Buor Khaya Peninsula is more degraded by thermokarst and characterized by long valleys of lower depth with short tributaries. Small, isolated Yedoma Ice Complex remnants in the Lena River Delta predominantly exhibit shorter but deep valleys. Based on these hydrographical network and topography assessments, we discuss geomorphological and hydrological connections to erosion processes. Relative catchment size along with regional slope interact with other Holocene relief-forming processes such as thermokarst and neotectonics. Our findings suggest that thermo-erosional valleys are prominent, hitherto overlooked permafrost degradation landforms that add to impacts on biogeochemical cycling, sediment transport, and hydrology in the degrading Siberian Yedoma Ice Complex.

Beschreibung: Maria S. Merian - MSM94 - SNAP Westlicher Subpolarer Atlantik 02.08.2020 - 06.09.2020

Beschreibung: 31.8.-6.9.2020

Beschreibung: 7.9.-13.9.2020

Beschreibung: 17.-23.8.2020

Beschreibung: 14.9.-20.9.2020

Beschreibung: 21.07 – 31.07.2020, Warnemünde (Germany) – Kiel (Germany) BALTEACH - 1

Beschreibung: 14. - 16.08.2020

Beschreibung: 28.9.-3.10.2020

Beschreibung: UVic-updates-opem introduces optimality-based phytoplankton and zooplankton into the UVic-ESCM (version 2.9) with variable C:N:P(:Chl) stoichiometry for phytoplankton, diazotrophs, and detritus. Code development started with and has incorporated updates provided by David Keller, Karin Kvale, and Levin Nickelsen.

Beschreibung: Maria S. Merian - MSM94 - SNAP Westlicher Subpolarer Atlantik 02.08.2020 - 06.09.2020

Beschreibung: 25.05. – 04.06.2020 Kiel – Heiligenhafen – Stohl – Schönhagen Cruise L10-20 was carried out in the framework of the project ‘Morphologische Projektionen Ostseeküste 2100’ (Morphological projections Baltic Sea Coast; financed by MELUND). The purpose of this cruise was to collect information on seafloor topography and sedimentology and shallow sub-seafloor stratigraphy of the morphodynamically active coastal zone of the focus areas Heiligenhafen,Stohl and Schönhagen. All three areas feature erosional cliff coasts acting as a sediment sources during high energy wave events. One of the aims of the project is to identify sediment transport pathways from the cliffs to the nearshore zone and to quantify the sediment budget in the coastal transport cells. This cruise served as a baseline study to be complemented during repetitive future cruises to the focus areas.

Beschreibung: 21.9.-27.9.2020

Beschreibung: Maria S. Merian - MSM94 - SNAP Westlicher Subpolarer Atlantik 02.08.2020 - 06.09.2020

Beschreibung: 24.-30.8.2020

Beschreibung: 15.06. - 19.06.2020 Areas of research: Public relations and Aquarium West Shore Port Calls: Grenå DK (15.06. - 18.06.2020, 3 nights) Acquisition of living marine organisms for the public relations division (GEOMAR), the institute´s own aquarium and the Multimar Wattforum (Tönning) in the northern Kattegat.

Beschreibung: Maria S. Merian - MSM94 - SNAP Westlicher Subpolarer Atlantik 02.08.2020 - 06.09.2020

Beschreibung: MSM94 – Maria S. Merian - SNAP Westlicher Subpolarer Atlantik 02.08.2020 - 06.09.2020

Beschreibung: MSM89 – Bridgetown/Barbados – Bridgetown/Barbados 2. Wochenbericht – MARIA S. MERIAN - MSM89 20.-26.01.2020

Beschreibung: MSM89 – Bridgetown/Barbados – Bridgetown/Barbados 1. Wochenbericht – MARIA S. MERIAN - MSM89 14.-19.01.2020

Beschreibung: MSM89 – Bridgetown/Barbados – Bridgetown/Barbados 3. Wochenbericht – MARIA S. MERIAN - MSM89 27.01.-02.02.2020

Beschreibung: Oct. 07 2019 – Oct. 10, 2019 Kiel (Germany) – Kiel (Germany) MNF-Pher-110The main purpose of the ALKOR cruise AL529 was the training of students in observational techniques applied by physical oceanographers. The students who participated in the trip attend the module "Measurement Methods of Oceanography" which is offered in the Bachelor program "Physics of the Earth System" at CAU Kiel. During the AL529 the students were instructed in instrument calibration and in the interpretation of measurement data at sea. In addition, the students had the opportunity to learn about working and living at sea and to explore and study the impact of physical processes in the western Baltic Sea, the sea at their doorstep. The observations show a quasi-synoptic picture of the hydrography and currents in the western Baltic Sea. Twice-repeated hydrographic and current sections across the Fehmarn Belt show well the short time scales where significant changes occur. A zonal section along the deepest topography, from about 10°40'E to 014°21'E, shows very nicely the two-layer system of outflowing low salinity and inflowing North Sea water. A bottom shield anchorage shows the currents in the water column and the near-bottom temperature and salinity variations in the Fehmarnbelt area.

Beschreibung: 05.07. – 18.07.2020, Kiel (Germany) – Warnemünde (Germany) BALTEACH - 1

Beschreibung: DIPLANOAGAP: Distribution of Plastics in the North Atlantic Garbage Patch Ponta Delgada (Portugal) – Malaga (Spain) 17.08. – 12.09.2019 The expedition POS 536 is part of a multi-disciplinary research initiative of GEOMAR investigating the origin, transport and fate of plastic debris from estuaries to the oceanic garbage patches. The main focus will be on the vertical transfer of plastic debris from the surface and near-surface waters to the deep sea and on the processes that mediate this transport. The obtained data will help to develop quantitative models that provide information about the level of plastic pollution in the different compartments of the open ocean (surface, water column, seafloor). Furthermore, the effects of plastic debris on marine organisms in the open ocean will be assessed. The cruise will provide data about the: (1) abundance of plastic debris with a minimum size of 100 μm as well as the composition of polymer types in the water column at different depths from the sea surface to the seafloor including the sediment, (2) abundance and composition of plastic debris in organic aggregates (“marine snow”), (3) in pelagic and benthic organisms (invertebrates and fish) and in fecal pellets, (4) abundance and the identity of biofoulers (bacteria, protozoans and metazoans) on the surface of plastic debris from different water depths, (5) identification of chemical compounds (“additives”) in the plastic debris and in water samples.

Beschreibung: Precipitation extremes with devastating socioeconomic consequences within the South American Monsoon System (SAMS) are expected to become more frequent in the near future. The complexity in SAMS behavior, however, poses severe challenges for reliable future projections. Thus, robust paleomonsoon records are needed to constrain the high spatiotemporal variability in the response of SAMS rainfall to different climatic drivers. This study uses Ti/Ca ratios from X‐ray fluorescence scanning of a sediment core retrieved off eastern Brazilian to trace precipitation changes over the past 322 Kyr. The results indicate that despite the spatiotemporal complexity of the SAMS, insolation forcing is the primary pacemaker of variations in the monsoonal system. Additional modulation by atmospheric p CO 2 suggests that SAMS intensity over eastern Brazil will be suppressed by rising CO 2 emissions in the future. Lastly, our record reveals an unprecedented strong and persistent wet period during Marine Isotope Stage 6 driven by anomalously strong trade winds.

Beschreibung: Streams and rivers are important components of the carbon cycle as they transport and transform dissolved organic matter (DOM). Using high‐resolution Fourier‐transform ion cyclotron resonance mass spectrometry, we studied the spatial distribution of DOM at the molecular level at more than 100 sites across a stream network during summer and winter baseflow. We developed a model approximating the time DOM spent in the fluvial network, a key constraint on the biogeochemical processing of DOM. Discharge‐weighted travel time explained the compositional changes of DOM, which differed markedly in summer and winter. We attribute these seasonal differences to variation in source material, putatively reflecting the dynamics of freshly produced DOM in summer and DOM with an imprint of leaf litter in winter. Hydrological mixing was an important driver of the spatial dynamics of DOM. From the convergence rate of DOM compound intensities to the network‐wide average, we inferred the spatial distribution of sources within the catchment. Finally, we estimated network‐wide apparent mass transfer coefficients (vf app) of individual DOM compounds, which describe the vertical velocity at which DOM compounds are removed by biotic and abiotic processes. We identified the oxidative state of carbon as an important factor explaining vf app, which we consequently attribute to biological uptake of thermodynamically favorable DOM compounds. This work contributes to our understanding of the spatial processes, temporal constraints, and chemical properties of DOM that regulate the transformation and diagenesis of DOM at the fluvial network scale.