Get to know the researchers in Environmental Geochemistry!
Tom Jilbert

Tom is Associate Professor of Environmental Geochemistry and Academy Research Fellow at the Department of Geosciences and Geography in Kumpula. His research is specialized in sediment biogeochemistry in human-impacted aquatic systems such as the Baltic Sea and eutrophic lakes. Tom is a member of the editorial boards of Chemical Geology, Frontiers in Earth Science and Frontiers in Marine Science, and co-ordinates the international symposium on lake restoration Lahti Lakes. He also participates as a key researcher in the Coastclim Centre.

Tom on Google Scholar, Research Portal, Research Gate and Twitter.

Kaarina Weckström

Kaarina is a University Researcher. She is a palaeoecologist interested in the reconstruction of past climate and environments using both marine and freshwater sediment proxy records. Her expertise includes marine, brackish and freshwater diatom taxonomy and ecology, and sediment biomarkers (especially IP25), with a special interest in proxy evaluation and development. Within the Environmental Geochemistry group, Kaarina works on reconstructions of paleoenvironmental change in the Black Sea and Baltic Sea using a combination of geochemical and paleoecological data. In earlier projects, Kaarina has studied recent eutrophication history of the Baltic Sea, the effects of groundwater phosphorus concentrations on lake trophic state, and Arctic environmental change.


Kaarina on Google Scholar and Research Portal.

Martijn Hermans

Martijn is a Postdoctoral Researcher specialized in electromicrobiology and marine biogeochemistry. His past research has focused on the impact of cable bacteria on coastal sediment biogeochemistry. Currently he is implementing coupled sedimentary iron and phosphorus dynamics into the BALTSEM model of the Baltic Sea. Among many applications, this model expansion can be used to gain a better mechanistic understanding of multidecadal feedbacks in oxygen conditions. His work is connected to collaborators including Bo Gustafsson (Stockholm University, Baltic Sea Centre) and Caroline Slomp (Radboud University, Netherlands). Martijn is funded by the Academy of Finland Research Fellowship of Tom Jilbert.

Martijn on Google Scholar.


Mareike Paul

Mareike Paul is a Doctoral Researcher studying the mechanisms of trace metal enrichment in the sediments of coastal European seas, including the Baltic Sea, Black Sea and Swedish West Coast fjords. Many details of sedimentary trace metal chemistry are still poorly constrained, which limits the use of trace metal enrichments as quantitative recorders of (past) hypoxia. Mareike's work aims to shed light on the various factors that control trace metal enrichments by studying a wide range of locations under varying degrees of anthropogenic stress. The project is a collaboration with international partners and is funded by the Academy of Finland Research Fellowship of Tom Jilbert.


Mareike on Google Scholar, Research Portal and Research Gate.

Siqi Zhao

Siqi is a Doctoral Researcher studying sedimentary phosphorus dynamics in eutrophic lakes in the agricultural areas of southern Finland. Siqi is interested in the effect of internal loading of phosphorus on recovery from lake eutrophication, and especially in the recovery timeline. In her PhD work, she is comparing the differences of sedimentary phosphorus processes between lakes with contrasting catchment characteristics and histories of nutrient loading. She is also applying reactive transport diagenetic modeling to the study of lake sediment phosphorus dynamics. Siqi is a grant researcher funded by the China Scholarship Council.

Frederico Aragão

Frederico is a Doctoral Researcher working on the hypolimnetic withdrawal and treatment pilot project at Lake Kymijärvi, Lahti. His interests are primarily in the mechanisms of phosphorus retention and capture in filtration systems. He is performing column experiments to study the capture of precipitates in porous media in the context of filtration of nutrient-rich hypolimnetic water. Data from field and laboratory experiments will be used to build a hydrogeochemical model to simulate processes in the treatment units. His work aims to support optimization of infrastructure operation in future applications of hypolimnetic withdrawal and therefore to improve strategies for lake restoration. Frederico's work is supported by EDUFI and the K.H. Renlund Foundation.

Former group members

The group was previously located at the EcoEnv research program as the Aquatic Biogeochemistry Research Unit (ABRU). Researchers who have been affiliated to ABRU and Environmental Geochemistry since 2015 include:

Susanna Hietanen

Karoliina Koho

Eero Asmala

Dana Hellemann

Saija Saarni

Sami Jokinen

Jesse Harrison

Myrsini Chronopoulou

Soila Silvonen

Iines Salonen

JP Myllykangas

Antti Rissanen

Petra Tallberg