20132020

Research output per year

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Personal profile

Description of research and teaching

My research interests lie in the field of marine biogeochemistry, with a focus on elemental cycling in coastal systems, biogeochemical responses to anthropogenic pressures, and, particularly, benthic nitrogen turnover. Excess availability of land-derived nitrogen in coastal waters has led to coastal eutrophication all around the world, including the Baltic Sea; at the same time, elemental turnover processes in the coastal zone can temporarily retain and permanently remove nitrogen, thereby mitigating its transport to open waters. Understanding nitrogen turnover in the coastal habitat is thus imperative for understanding its fate in the wider marine system.

 

Research projects:

Elucidating seasonal substrate limitation of benthic nitrate reduction in the coastal Baltic Sea (PostDoc: Walter and Andrée de Nottbeck Foundation, 2020-2021)

Biogeochemical links between eutrophication and climate change in the Baltic Sea (PhD student: Academy of Finland, 2013-2018)

BONUS COCOA - Nutrient cocktail in coastal zones of the Baltic Sea (PhD student: funded jointly by the EU and the Academy of Finland, 2014-2017).

 

Curriculum vitae

Since 2020.  Post-doctoral researcher (University of Helsinki).

2014-2019.  PhD in Aquatic Sciences (University of Helsinki).

2012-2014.  Research Associate in Biological Oceanography (GEOMAR Helmholtz Centre for Ocean Research, Kiel).

2009-2012.  MSc in Biological Oceanography (GEOMAR Helmholtz Centre for Ocean Research, University of Kiel).

2006-2009.  BSc in Environmental Sciences (Institute for Chemistry and Biology of the Marine Environment, University of Oldenburg).

Fields of Science

  • 1172 Environmental sciences
  • marine biogeochemistry, coastal biogeochemistry, sediment biogeochemistry, nitrogen cycle, benthic-pelagic coupling, coastal filter, eutrophication, Baltic Sea, nitrate reduction, isotope pairing technique

International and National Collaboration Publications and projects within past five years.

Publications

  • 7 Article
  • 1 Commissioned report
  • 1 Review Article
  • 1 Doctoral Thesis

Seasonal cycle of benthic denitrification and DNRA in the aphotic coastal zone, northern Baltic Sea

Hellemann, D., Tallberg, P., Aalto, S. L., Bartoli, M. & Hietanen, S., 5 Mar 2020, In : Marine Ecology. Progress Series. 637, p. 15-28 14 p.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
File

Application of the isotope pairing technique in sediments: Use, challenges, and new directions

Robertson, E. K., Bartoli, M., Bruechert, V., Dalsgaard, T., Hall, P. O. J., Hellemann, D., Hietanen, S., Zilius, M. & Conley, D. J., Feb 2019, In : Limnology and Oceanography: Methods. 17, 2, p. 112-136 25 p.

Research output: Contribution to journalReview ArticleScientificpeer-review

Open Access
File

Nitrogen cycling in aphotic coastal sandy sediments of the Baltic Sea

Hellemann, D., 2019, Helsinki: University of Helsinki. 34 p.

Research output: ThesisDoctoral ThesisCollection of Articles

Open Access
File

Particulate organic matter controls benthic microbial N retention and N removal in contrasting estuaries of the Baltic Sea

Bartl, I., Hellemann, D., Rabouille, C., Schulz, K., Tallberg, P., Hietanen, S. & Voss, M., 19 Sep 2019, In : Biogeosciences. 16, 18, p. 3543-3564 22 p.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
File

Enhanced transfer of organic matter to higher trophic levels caused by ocean acidification and its implications for export production: A mass balance approach

Boxhammer, T., Taucher, J., Bach, L. T., Achterberg, E. P., Alguero-Muniz, M., Bellworthy, J., Czerny, J., Esposito, M., Haunost, M., Hellemann, D., Ludwig, A., Yong, J. C., Zark, M., Riebesell, U. & Anderson, L. G., 25 May 2018, In : PLoS One. 13, 5, 25 p., 0197502.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
File

Projects

Activities

  • 11 Types for other activities - Other
  • 8 Organisation and participation in conferences, workshops, courses, seminars
  • 3 Public Talks
  • 1 Supervision of other thesis (Master's, Licentiate)

14th International Biogeochemistry Symposium

Dana Hellemann (Speaker: Presenter)
4 Jun 20178 Jun 2017

Activity: Participating in or organising an event typesPublic Talks

Scientific blog:"Sources & Sinks: A Tale of Coastal Biogeochemistry - BONUS COCOA"

Dana Hellemann (Teacher)
Jan 2017 → …

Activity: Other activity typesTypes for other activities - Other

2nd DENVI annual meeting

Dana Hellemann (Speaker: Presenter)
6 Feb 20177 Feb 2017

Activity: Participating in or organising an event typesPublic Talks

Sampling season at Tvärminne Zoological Station

Dana Hellemann (Teacher)
Apr 2016Nov 2016

Activity: Other activity typesTypes for other activities - Other

CommOCEAN 2016

Dana Hellemann (Speaker: Presenter)
6 Dec 20167 Dec 2016

Activity: Participating in or organising an event typesOrganisation and participation in conferences, workshops, courses, seminars