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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

Biography

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:

  • 2017-2020: Understand and predict how change in sea ice and ocean properties will affect the large-scale ecosystem structure of the Arctic Ocean (Arctic PRIZE). (NERC Changing Arctic Ocean Program), associated member
  • 2017-2020: Diversity, taxonomy and distribution of marine protists in a changing Arctic (TaxMArc). (Research Council of Norway, project no. 268286/GMR), Co-PI
  • 2015-2019: InterDisciplinary study of Arctic sea ice changes and impacts for the society (ID Arctic). (grant by the Norwegian Ministry of Foreign Affairs), Co-PI
  • 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)
  • ID Arctic – InterDisciplinary study of Arctic sea ice changes and impacts for the society (UID project, 2015-2018)

Completed national and international projects:

  • 2014-2017: Ecosystem modelling of the Arctic Ocean around Svalbard (ArktisMod). (Fram Centre Flagship “Sea ice in the Arctic Ocean, Technology and Systems of Agreement”), Co-PI
  • 2012: Morphological and molecular identification of key phytoplankton species from the Southern Ocean. (European Community – Research Infrastructure Action under the FP7 ‘‘Capacities’’ Specific Programme ASSEMBLE (grant no. 227799)), Main PI
  • 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. Van Leeuwe, M., Tedesco, L., Arrigo, K., Assmy, P., Campbell, K., Meiners, K., Rintala, J.-M., Selz, V., Thomas, D. and Stefels, J., (submitted) Microalgal biodiversity and primary production in Arctic and Antarctic sea ice: A synthesis. Elementa.
  2. Wollenburg, J.E., Katlein, C., Nehrke, G., Nöthig, E.-M., Matthiessen, J., Wolf-Gladrow, D.A., Nikolopoulos, A., Gazquez-Sanchez, F., Rossmann, L., Assmy, P., Babin, M., Bruyant, F., Dybwad, C. and Peeken I. (under revision) The gypsum gravity chute to the Arctic abyss. Scientific Reports
  3. Henjes, J., Friedrichs, L. E., Assmy, P., Jansen, S., Kraegefsky, S. and Bathmann, U. (under revision). Fate of copepod faecal pellets during an iron-induced phytoplankton bloom in the Southern Ocean. Marine Ecology Progress Series.
  4. Laglera, L.M., Tovar-Sanchez, A., Iversen, M.H., González, H.E., Naik, H., Assmy, P., Klaas, C., Mazzocchi, G., Montresor, , Naqvi, S.W.A. and Smetacek V. (under revision). Iron cycling during the LOHAFEX iron fertilization experiment in the Southern Ocean, Part I. Iron partitioning. Marine Chemistry.
  5. Brown, T.A., Assmy, P., Hop, H., Wold, A. and Belt, S.T. (2017) Transfer of ice algal carbon to ice-associated amphipods in the high-Arctic pack ice environment. Journal of Plankton Research. doi:10.1093/plankt/fbx030
  6. Belt, S.T., Brown, T.A., Smik, L., Tatarek, A., Wiktor, J., Stowasser, G., Assmy, P., Allen, C. and Husum, K. (2017) Identification of C25 highly branched isoprenoid (HBI) alkenes in diatoms of the genus Rhizosolenia in high latitude marine phytoplankton. Organic Geochemistry, 110, 65-72.
  7. Duarte, P., Meyer, A., Olsen, L.M., Kauko, H.M., Assmy, P., Rösel, A., Itkin, P., Hudson, S.R., Granskog, M.A., Gerland, S., Sundfjord, A., Steen, H., Hop, H., Peterson, A.K., Jeffery, N., Elliott, S.M., Hunke, E.C., Turner, A.K. (2017). Sea ice thermohaline-dynamics and biogeochemistry in the Arctic Ocean: empirical and model results. Journal of Geophysical Research – Biogeosciences, 122, doi:10.1002/ 2016JG003660.
  8. Kauko, H.M., Taskjelle, T., Assmy, P., Pavlov, A.K., Mundy, C.J., Duarte, P., Fernández Méndez, M., Olsen, L. M., Hudson, S. R., Johnsen, G., Elliott, A., Wang, F. and Granskog, M. A. (2017). Windows in Arctic sea ice: light transmission and ice algal optical properties in a refrozen lead. Journal of Geophysical Research – Biogeosciences, 122, 1486–1505, doi:10.1002/ 2016JG003626.
  9. Olsen, L.M., Laney, S.R., Duarte, P., Kauko, H.M., Fernández-Méndez, M., Mundy, C.J., Rösel, A., Meyer, A., Itkin, P., Cohen, L., Peeken, I., Tatarek, A., Róźańska, M., Wiktor, J., Taskjelle, T., Pavlov, A.K., Hudson, S.R., Granskog, M.A., Hop, H. and Assmy, P. (2017). The role of multiyear ice in seeding ice algae blooms in the Arctic pack ice. Journal of Geophysical Research – Biogeosciences, 122, doi:10.1002/2016JG003668.
  10. Pavlov, A.K., Taskjelle, T., Kauko, H.M., Hamre, B., Hudson, S.R., Assmy, P., Duarte, P., Fernández-Méndez, M., Mundy, C.J., and Granskog, M.A. (2017). Altered inherent optical properties and estimates of the underwater light field during an Arctic under-ice bloom of Phaeocystis pouchetii. Journal of Geophysical Research – Oceans, 122, 4939–4961, doi:10.1002/ 2016JC012471.
  11. Fransson, A., Chierici, M., Skjelvan, I., Olsen, A., Assmy, P., Peterson, A.K., Spreen, G. and Ward, B. (2017). Under-ice fCO2, sea-air CO2 fluxes and effect of storm events and an under-ice phytoplankton bloom on sea-air CO2 fluxes during the winter-spring transition in the high Arctic Ocean. Journal of Geophysical Research – Oceans, 122, doi: 1002/2016JC012478
  12. Assmy, P., Fernández-Méndez, M., Duarte, P., Meyer, A., Randelhoff, A., Mundy, C.J., Olsen, L.M., Kauko, H.M., Bailey, A., Chierici, M., Cohen, L., Doulgeris, A.P., Ehn, J.K., Fransson, A., Gerland, S., Hop, H., Hudson, S.R., Hughes, N., Itkin, P., Johnsen, G., King, J.A., Koch, B.P., Koenig, Z., Kwasniewski, S., Laney, S.R., Nicolaus, M., Pavlov, A.K., Polashenski, C.M., Provost, C., Rösel, A., Sandbu, M., Spreen, G., Smedsrud, L.H., Sundfjord, A., Taskjelle, T., Tatarek, A., Wiktor, J., Wagner, P.M., Wold, A., Steen, H. and Granskog, M.A. (2017). Leads in Arctic pack ice enable early phytoplankton blooms below snow-covered sea ice. Scientific Reports, 7, 40850; doi: 10.1038/srep40850.
  13. 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.
  14. Leu, E., Assmy, P., ET AL. (in press). Arctic spring awakening – steering principles behind the phenology of vernal ice algae blooms. Progress in Oceanography.
  15. 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.
  16. 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.
  17. 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.
  18. 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.
  19. 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.
  20. 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.
  21. 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.
  22. 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
  23. 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.
  24. Assmy, P., ET AL. (2013). Floating ice-algal aggregates below melting Arctic sea ice. PLOS ONE, 8(10), e76599.
  25. 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
  26. 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.
  27. Smetacek, V., Assmy, P., ET AL. (2012). Deep carbon export from a Southern Ocean iron-fertilized diatom bloom. Nature, 487, 313-319.
  28. 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.
  29. 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.
  30. 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.
  31. 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.
  32. 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.
  33. Assmy, P. and Smetacek, V. (2009). Algal blooms, In: Encyclopedia of Microbiology, (Moselio Schaechter, Editor), Oxford: Elsevier, pp. 27-41.
  34. 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.
  35. 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.
  36. Henjes, J., Assmy, P. (2008). Particle availability controls agglutination in pelagic tintinnids in the Southern Ocean. Protist, 159, 239-250.
  37. 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.
  38. 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.
  39. 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.
  40. 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.
  41. 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.
  42. Assmy, P., ET AL. (2006). Auxospore formation by the silica-sinking, oceanic diatom Fragilariopsis kerguelensis (BACILLARIOPHYCEAE), Journal of Phycology, 42, 1002-1006.
  43. 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.
  44. 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.

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