iron, is considered the key factor in controlling Southern Ocean phytoplankton productivity and community structure. However, phytoplankton are not isolated from other microorganisms and biological interactions [...] will focus on viral-bacterial-phytoplankton interactions considering biologically excreted organic matter as a control for trace metal chemistry, bioavailability to phytoplankton and productivity. As the increase [...] anthropogenic CO2, playing therefore a pivotal role in the global climate system. Southern Ocean phytoplankton are major drivers of global carbon cycling accounting for 20% of the global annual primary pr

will inevitably affect coastal phytoplankton communities. To better understand the impact of light, iron and carbon dioxide availability as potential modulators of phytoplankton community dynamics in Ryder [...] CO2 incubation experiments with Ryder ay phytoplankton. Picture: S. Trimborn (Photo: Alfred-Wegener-Institut) Sampling of seawater containing Ryder Bay phytoplankton. Picture: S. Trimborn (Photo: Alfred- [...] Light, iron and carbon dioxide availability as potential modulators of phytoplankton community dynamics in Ryder Bay, Western Antarctic Peninsula The British research station Rothera on the Western Antarctic

2015/16 this situation was remedied by creating a metadata inventory for all zooplankton and phytoplankton data collected in the Antarctic, particularly for the Weddell Sea and adjacent areas such as the

zooplankton composition, biodiversity as well as physiological processes. Large scale observations of phytoplankton surface distributions are done via remote sensing. In addition, experiments with key species are [...] temperature increase and acidification of the Arctic Ocean. Team Dr. Eva-Maria Nöthig (coordinator, phytoplankton ecology & particle flux) Prof. Dr. Astrid Bracher (PI, remote sensing) Prof. Dr. Anja Engel (PI

Laboratory Trace element analysis of seawater and phytoplankton. Trace elements (e.g. Fe, Mn, Co, Cu, Zn, Mo) in seawater strongly influence the growth of phytoplankton. To understand the cycle of trace elements [...] elements as well as the influence of trace elements on phytoplankton growth, the concentration of the mentioned elements in seawater and phytoplankton can be analyzed via the coupling of a SeaFast system to [...] Trace element analysis of phytoplankton cells. Using a high resolution ICP-MS of NuInstruments (figure 4D), trace metal concentrations (Fe, Co, Zn, Cd, Mn, Mo, Cu) of phytoplankton cells can be quantified

vitamin B12, respectively. Some phytoplankton species may be able to replace Zn with Co while others cannot. B-Vitamins are required by more than half of all phytoplankton species and play an important role [...] Looking beyond Iron: Dynamics of vitamins, zinc and cobalt and their effect on phytoplankton community composition in a changing Southern Ocean In large areas of the worlds oceans iron (Fe) limits primary [...] as well as open ocean waters. To date, however, the influences of these micronutrients on SO phytoplankton and their biological requirement for growth are poorly known. The focus of this project will be

y) affect not only the timing, but also the physiology and biochemistry in sea ice algae and phytoplankton. This has implications for the efficiency of trophic transfer, as well as for the use of trophic [...] developing biochemical pathways which enable them to accumulate large lipid stores during summer phytoplankton blooms. The importance of lipids is connected to their capability to store energy in a very efficient [...] closely related to biological and hydrographical studies. These basic data are important to study phytoplankton blooms and to characterize water masses due to different nutrient concentrations in the oceans

Species interactions and underlying processes To explain mass proliferation (bloom formation) of phytoplankton and the corresponding consequences on the ecosystem, it is crucial to understand the underlying

through inter-comparisons with other existing satellite derived products on phytoplankton composition including phytoplankton size class (PSC), SynSenPFT, OC-PFT and PHYSAT. Preliminary experiment of the [...] OLCI-PFT Global Retrieval of Phytoplankton Functional Types (PFTs) from OLCI and Merged Ocean Colour products This collaborative AWI-ACRI-ST project funded by ACRI-ST focuses on retrieving global PFTs [...] the satellite data but also a very large (about 12,000) globally distributed field data set on phytoplankton pigments. With data of only nine spectral bands from the merged ocean color products, it is possible

2020.111704 Outreach: 1) AWI press release “Observing Phytoplankton via Satellite” : <link en about-us service press press-release observing-phytoplankton-via-satellite.html> www.awi.de/en/about-us/servic [...] Global phytoplankton group chl-a data sets online Application of Xi et al. (2020) algorithm for retrieving multiple PFTs from space: a) Software: C-TEP, Coastal Thematic Exploitation Platform, is an online [...] 2 Figure: Sentinel-3 Ocean Land. Colour Imager (OLCI) chlorophyll-a concentration of various phytoplankton groups (rom left to right: diatoms, dinoflagellates, green algae (upper panel), haptophytes,