Philipp Assmy » Members

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Philipp Assmy

Research scientist Norwegian Polar InstituteResearch department: ecotoxicology
Work address Norwegian Polar Institute Fram Centre Tromsø 9296 Norway Work Phone: +47 77 75 05 87
Photo of Philipp Assmy


Research interests:

  • Phyto- and protozooplankton ecology
  • Sea ice biology
  • Ocean biogeochemistry in particular carbon and silicon cycles
  • Diatom taxonomy
  • Field experience from the Arctic Ocean and Southern Ocean.

Running national and international projects:

  • N-ICE2015 – Norwegian yound sea ICE cruise
  • Boom or Bust – Ice-algal and under-ice phytoplankton bloom dynamics in a changing Arctic icescape (RCN project, 2015-2018)
  • ID Arctic – InterDisciplinary study of Arctic sea ice changes and impacts for the society (UID project, 2015-2018)

Completed national and international projects:

  • Controls on and paleoceanographic utility of the valve size frequency distribution of the Southern Ocean diatom, Fragilariopsis kerguelensis (DFG project, 2008-2012)

Relevant scientific publications:

  1. Barber, D.G., Assmy, P., ET AL. (in press). Selected physical, biological and biogeochemical implications of a rapidly changing Arctic Marginal Sea Ice Zone. Progress in Oceanography.
  2. Leu, E., Assmy, P., ET AL. (in press). Arctic spring awakening – steering principles behind the phenology of vernal ice algae blooms. Progress in Oceanography.
  3. Duarte, P., Assmy, P., ET AL. (2015). Modeling potentials and limitations for estimating production of ice algae in the Arctic Ocean. Journal of Marine Systems, 145, 69-90.
  4. Thiele, S., Assmy, P., ET AL. (2014). Stable composition of the nano- and picoplankton community during the iron fertilization experiment LOHAFEX. PLOS ONE, 9(11), e113244.
  5. Assmy, P., ET AL. (2014). Response of the protozooplankton assemblage during the European Iron Fertilization Experiment (EIFEX) in the Antarctic Circumpolar Current. Journal of Plankton Research, 36(5), 1175-1189.
  6. Latasa, M., Assmy, P., ET AL. (2014). Progressive decoupling between phytoplankton growth and microzooplankton grazing during an iron-induced phytoplankton bloom in the Southern Ocean. Marine Ecology Progress Series, 513, 39-50.
  7. Ebersbach, F., Assmy, P., ET AL. (2014). Particle flux characterisation and sedimentation patterns of protistan plankton during the iron fertilization experiment LOHAFEX in the Southern Ocean. Deep-Sea Research Part I, 89, 94-103.
  8. Armbrecht, L.H., Assmy, P., ET AL. (2014). Cell death and aggregate formation in the giant diatom Coscinodiscus wailesii (Gran & Angst, 1931). Journal of Experimental Marine Biology and Ecology, 452, 31-39.
  9. Lydersen, C., Assmy, P., ET AL. (2014). The importance of glacier fronts for marine mammals and seabirds in Svalbard, Norway. Journal of Marine Systems, 129, 452-471.
  10. Nomura, D., Assmy, P., ET AL. (2013). Arctic and Antarctic sea ice acts as a sink for atmospheric CO2 during periods of snow melt and surface flooding. Journal of Geophysical Research – Oceans, 118, 1-14, doi: 10.1002/2013JC009048
  11. Assmy, P., ET AL. (2013). Thick-shelled, grazer-protected diatoms decouple ocean carbon and silicon cycles in the iron-limited Antarctic Circumpolar Current. Proceedings of the National Academy of Sciences of the United States of America, 110(51), 20633-20638, doi: 10.1073/pnas.1309345110.
  12. Assmy, P., ET AL. (2013). Floating ice-algal aggregates below melting Arctic sea ice. PLOS ONE, 8(10), e76599.
  13. Fuchs, N., Assmy, P., ET AL. (2013). Genetic characterization and life cycle of the diatom Fragilariopsis kerguelensis. European Journal of Phycology, 48(4), 411-426.N
  14. Nomura, D., Assmy, P., ET AL. (2013). Characterization of ikaite (CaCO3 x 6H2O) crystals in first-year Arctic sea ice north of Svalbard. Annals of Glaciology, 54, 125-131.
  15. Smetacek, V., Assmy, P., ET AL. (2012). Deep carbon export from a Southern Ocean iron-fertilized diatom bloom. Nature, 487, 313-319.
  16. Leblanc, K., Assmy, P., ET AL. (2012). A global diatom database – abundance, biovolume and biomass in the world ocean. Earth System Science Data Discussions, 4, 149 – 165.
  17. Ligowski, R., Jordan, R.W. and Assmy, P. (2012). Morphological adaptation of a planktonic diatom to growth in Antarctic sea ice. Marine Biology, 159, 817-827.
  18. Geibert, W., Assmy, P., ET AL. (2010). High productivity in an ice melting hotspot at the eastern boundary of the Weddell Gyre. Global Biogeochemical Cycles, 24 GB3007, doi:10.1029/2009GB003657.
  19. Gaebler-Schwarz, S., Assmy, P., ET AL. (2010). A new cell stage in the haploid-diploid life cycle of the colony-forming haptophyte Phaeocystis antarctica and its ecological implications. Journal of Phycology, 46(5), 1006-1016.
  20. Kooistra, W.H.C.F., Assmy, P., ET AL. (2010). Comparative molecular and morphological phylogenetic analyses of taxa in the Chaetocerotaceaea (Bacillariophyta). Phycologia, 49(5), 471-500.
  21. Assmy, P. and Smetacek, V. (2009). Algal blooms, In: Encyclopedia of Microbiology, (Moselio Schaechter, Editor), Oxford: Elsevier, pp. 27-41.
  22. Michels, J., Assmy, P., ET AL. (2008). Short-term biogenic particle flux under late spring sea ice in the western Weddell Sea, Deep-Sea Research II, 55, 1024-1039.
  23. Assmy, P., ET AL. (2008). Morphological variability and life cycle traits of the type species of the diatom genus Chaetoceros, C. dichaeta. Journal of Phycology, 44, 152-163.
  24. Henjes, J., Assmy, P. (2008). Particle availability controls agglutination in pelagic tintinnids in the Southern Ocean. Protist, 159, 239-250.
  25. Assmy, P., ET AL. (2007). Mechanisms determining species dominance in a phytoplankton bloom induced by the iron fertilization experiment EisenEx in the Southern Ocean. Deep-Sea Research I, 54, 340-362.
  26. Henjes, J., Assmy, P., ET AL. (2007). Response of microzooplankton (protists and small copepods) to an iron-induced phytoplankton bloom in the Southern Ocean (EisenEx). Deep-Sea Research I, 54, 363-384.
  27. Henjes, J, Assmy, P., ET AL. (2007). Response of the larger protozooplankton to an iron-induced phytoplankton bloom in the Polar Frontal Zone of the Southern Ocean (EisenEx). Deep-Sea Research I, 54, 774-791.
  28. Croot, P. L., Assmy, P., ET AL. (2007). Surface active substances in the upper water column during a Southern Ocean Iron Fertilization Experiment (EIFEX), Geophysical Research Letters, 34, doi:10.1029/2006GL028080.
  29. Hoffmann, L. J., Assmy, P., ET AL. (2006). Different reactions of Southern Ocean phytoplankton size classes to iron fertilization. Limnology and oceanography, 51(3), 1217-1229.
  30. Assmy, P., ET AL. (2006). Auxospore formation by the silica-sinking, oceanic diatom Fragilariopsis kerguelensis (BACILLARIOPHYCEAE), Journal of Phycology, 42, 1002-1006.
  31. De Baar, H. J. W., Assmy, P., ET AL. (2005). Synthesis of iron fertilization experiments: From the Iron Age in the Age of Enlightenment, Journal of Geophysical Research: Oceans, 110. doi: 10.1029/2004JC002601.
  32. Smetacek V., Assmy P., Henjes J. (2004). The role of grazing in structuring Southern Ocean pelagic ecosystems and biogeochemical cycles, Antarctic Science, 16 (4), pp. 541-558.

Popular science and outreach:

  •     Assmy, P., Lochte, K. and Smetacek, V. (2009). Plankton productivity and the role of iron in the Southern Ocean. In: Biological studies in polar oceans – exploration of life in icy waters. 35 research reports and reviews, Gotthilf and Irmtraut Hempel (Editors), Wirtschaftsverlag NW, Verlag für neue Wissenschaft, Bremerhaven, 227-235.