Marcelo Ketzer

I am a professor in environmental science with focus on sedimentary geochemistry at the Department of Biology and Environmental Science. My current research interests are on the chemistry of sediments and soils (and related pore waters and gases) in their pristine state and when altered by human activities. I am also interested in the relationships between life and chemistry in geological environments.

Teaching

I am involved in teaching geosciences, climate change, and environmental science in the Environmental Analyst Programme (undergraduate level) and in the Environmental Science and Sustainability Programme (master level). Both programmes are in the Faculty of Life and Health Sciences.

Research

I am participating of several research projects with focus on the response of natural systems to climate change. We are investigating, for instance, how climate change may affect biogeochemical cycles in sediments of the Baltic Sea and, therefore, how environmental conditions may be modified in the future. Understanding the natural systems and how they are affected by climate change will be important to plan for remediation actions in a global warming scenario. Another important consequence of climate change to the marine environment is the stability of large reservoirs of methane trapped as gas hydrates in deep sea. The stability of such systems is sensitive to glacial- interglacial changes in water pressure (sea-level) and temperature, but also to the poorly understood dynamics of venting structures observed to release gas to the oceans. An improved understanding of gas release over time is of wide scientific and social relevance, due to its impacts on global carbon budgets, marine life, seabed slope stability and resource assessments. I am participating of research projects in the Amazon deep-sea fan and in the Rio Grande Cone (Atlantic Ocean), and in the Baltic Sea and Mediterranean Sea.

Marcelo investigates pollution in Baltic Sea sediments (in Swedish).

News

My research groups

Environmental Geochemistry Our research group consists of environmental scientists working with issues related to environmental geochemistry, which is the study of how chemical processes and flows in…

My ongoing research projects

Publications

Article in journal (Refereed)

Seidel, L., Sachpazidou, V., Ketzer, J.M., Hylander, S., Forsman, A., et al. (2023). Long-term warming modulates diversity, vertical structuring of microbial communities, and sulfate reduction in coastal Baltic Sea sediments. Frontiers in Microbiology. 14.
Status: Published
Ketzer, J.M., Praeg, D., Augustin, A.H., Rodrigues, L.F., Steiger, A.K., et al. (2023). Gravity complexes as a focus of seafloor fluid seepage : the Rio Grande Cone, SE Brazil. Scientific Reports. 13 (1).
Status: Published
Seidel, L., Broman, E., Nilsson, E., Ståhle, M., Ketzer, J.M., et al. (2023). Climate change-related warming reduces thermal sensitivity and modifies metabolic activity of coastal benthic bacterial communities. The ISME Journal. 17. 855-869.
Status: Published
Praeg, D., Silva, C.G., Reis, A.T.D., Cruz, A., Ketzer, J.M., et al. (2022). Seismic evidence of gas hydrate and seafloor fluid escape on the upper Amazon deep-sea fan, Brazilian equatorial margin. Brazilian Journal of Geophysics. 40 (3).
Status: Published
Seidel, L., Ketzer, J.M., Broman, E., Shahabi-Ghahfarokhi, S., Rahmati-Abkenar, M., et al. (2022). Weakened resilience of benthic microbial communities in the face of climate change. ISME Communications. 2 (1).
Status: Published
Shahabi-Ghahfarokhi, S., Åström, M.E., Yu, C., Lindquist, T., Djerf, H., et al. (2022). Extensive dispersion of metals from hemiboreal acid sulfate soil into adjacent drain and wetland. Applied Geochemistry. 136.
Status: Published
Proenca, A.M., Oliveira, M.M., Neves, P.F.R., Giongo, A., De Oliveira, R.R., et al. (2022). Genomic, biochemical, and phylogenetic evaluation of bacteria isolated from deep-sea sediment harboring methane hydrates. Archives of Microbiology. 204 (4).
Status: Published
Shahabi-Ghahfarokhi, S., Rahmati-Abkenar, M., Matson, J.G., Karimi, H., Yu, C., et al. (2022). Removal and potential recovery of dissolved metals from acid sulfate soil drainage by spent coffee-grounds and dissolved organic carbon. Environmental Advances. 8.
Status: Published
Stranne, C., O'regan, M., Hong, W., Bruchert, V., Ketzer, J.M., et al. (2022). Anaerobic oxidation has a minor effect on mitigating seafloor methane emissions from gas hydrate dissociation. Communications Earth & Environment. 3 (1).
Status: Published
Westmeijer, G., Mehrshad, M., Turner, S., Alakangas, L., Sachpazidou, V., et al. (2022). Connectivity of Fennoscandian Shield terrestrial deep biosphere microbiomes with surface communities. Communications Biology. 5 (1).
Status: Published
Santos, V.H.J.M.D., Engelmann, P.D.M., Marconatto, L., Borge, L.G.D.A., Palhano, P.D.L., et al. (2022). Exploratory analysis of the microbial community profile of the municipal solid waste leachate treatment system : A case study. Waste Management. 141. 125-135.
Status: Published
Shahabi-Ghahfarokhi, S., Rahmati-Abkenar, M., Jaeger, L., Josefson, S., Djerf, H., et al. (2022). The response of metal mobilization and redistribution to reoxygenation in Baltic Sea anoxic sediments. Science of the Total Environment. 837.
Status: Published
Shahabi-Ghahfarokhi, S., Åström, M.E., Josefsson, S., Apler, A., Ketzer, J.M. (2021). Background concentrations and extent of Cu, As, Co, and U contamination in Baltic Sea sediments. Journal of Sea Research. 176.
Status: Published
Rahmati-Abkenar, M., Alizadeh, M., Ketzer, J.M. (2021). A New Dynamic Modeling Approach to Predict Microbial Methane Generation and Consumption in Marine Sediments. Energies. 14 (18).
Status: Published
Shahabi-Ghahfarokhi, S., Josefsson, S., Apler, A., Kalbitz, K., Åström, M.E., et al. (2021). Baltic Sea sediments record anthropogenic loads of Cd, Pb, and Zn. Environmental Science and Pollution Research. 28. 6162-6175.
Status: Published
Pires, J.P., Ramos, A.D.S., Mattos, C.F., Ketzer, J.M., Lourega, R.V. (2021). Analysis of the Effect of Organic Salts Derived from L-Phenylalanine Amino Acid as Kinetic Promoters/Inhibitors of CO₂ Hydrates. Energy & Fuels. 35 (9). 8095-8101.
Status: Published
Vernooij, R., Siqueira, T.D.A., Hangx, S., Spiers, C., Ketzer, J.M., et al. (2021). CO₂‐water‐rock interactions in undeformed and sheared claystone caprocks from Northern Europe. Greenhouse Gases : Science and Technology. 11 (2). 232-250.
Status: Published
Giongo, A., Dos Anjos Borges, L.G., Marconatto, L., Palhano, P.D.L., Serbent, M.P., et al. (2020). Adaption of microbial communities to the hostile environment in the Doce River after the collapse of two iron ore tailing dams. Heliyon. 6 (8). 1-16.
Status: Published
Ketzer, J.M., Praeg, D., Rodrigues, L.F., Augustin, A., Pivel, M.A.G., et al. (2020). Gas hydrate dissociation linked to contemporary ocean warming in the southern hemisphere. Nature Communications. 11 (1). 1-9.
Status: Published
Rodrigues, L.F., Macario, K.D., Anjos, R.M., Ketzer, J.M., Maraschin, A.J., et al. (2020). Origin and alteration of organic matter in hydrate-bearing sediments of the Rio Grande Cone, Brazil : evidence from biological, physical, and chemical factors.. Radiocarbon. 62 (1). 197-206.
Status: Published
Giongo, A., Haag, T., Medina-Silva, R., Heemann, R., Pereira, L.M., et al. (2020). Distinct deep subsurface microbial communities in two sandstone units separated by a mudstone layer. Geosciences Journal. 24. 267-274.
Status: Published
Da Silva Ramos, A., Pires, J.P., Ketzer, J.M., De Araujo, G.E., Lourega, R.V. (2020). Synthesis of new CO₂ hydrate inhibitors. Journal of Natural Gas Science and Engineering. 75. 1-6.
Status: Published
Braga, R., Iglesias, R.S., Romio, C., Praeg, D., Miller, D., et al. (2020). Modelling methane hydrate stability changes and gas release due to seasonal oscillations in bottom water temperatures on the Rio Grande cone, offshore southern Brazil. Marine and Petroleum Geology. 112. 1-15.
Status: Published
Ramos, A.D.S., Pires, J.P., Ketzer, J.M., Lourega, R.V. (2020). Organic salts as kinetic and thermodynamic inhibitors for CO₂ hydrate precipitation. Journal of Natural Gas Science and Engineering. 82. 1-8.
Status: Published
Rodrigues, L., Ketzer, J.M., Oliveira, R., Dos Santos, V., Augustin, A., et al. (2019). Molecular and Isotopic Composition of Hydrate-Bound, Dissolved and Free Gases in the Amazon Deep-Sea Fan and Slope Sediments, Brazil. Geosciences. 9 (2). 1-15.
Status: Published
Ketzer, J.M., Praeg, D., Pivel, M., Augustin, A., Rodrigues, L.F., et al. (2019). Gas Seeps at the Edge of the Gas Hydrate Stability Zone on Brazil’s Continental Margin. Geosciences. 9 (5). 1-11.
Status: Published
Rodrigues, L.F., Ramos, A., De Araujo, G., Silveira, E., Ketzer, J.M., et al. (2019). High-Pressure and Automatized System for Study of Natural Gas Hydrates. Energies. 12 (16).
Status: Published
Stranne, C., O’regan, M., Jakobsson, M., Brüchert, V., Ketzer, J.M. (2019). Can anaerobic oxidation of methane prevent seafloor gas escape in a warming climate?. Solid Earth. 10 (5). 1541-1554.
Status: Published
Cedeno, D.G., Conceicao, R.V., Wilbert De Souza, M.R., Schimdt Quinteiro, R.V., Carniel, L.C., et al. (2019). An experimental study on smectites as nitrogen conveyors in subduction zones. Applied Clay Science. 168. 409-420.
Status: Published
Tharimela, R., Augustin, A., Ketzer, J.M., Cupertino, J., Miller, D., et al. (2019). 3D CSEM imaging of gas hydrates : insights from the Pelotas Basin, offshore Brazil.. Interpretation. 7 (4). SH111-SH131.
Status: Published
Ketzer, J.M., Augustin, A., Rodrigues, L.F., Oliveira, R., Praeg, D., et al. (2018). Gas seeps and gas hydrates in the Amazon deep-sea fan. Geo-Marine Letters. 38 (5). 429-438.
Status: Published
Engelmann, P.D.M., Dos Santos, V.H.J.M., Barbieri, C.B., Augustin, A.H., Ketzer, J.M., et al. (2018). Environmental monitoring of a landfill area through the application of carbon stable isotopes, chemical parameters and multivariate analysis. Waste Management. 76. 591-605.
Status: Published
Medina-Silva, R., De Oliveira, R.R., Pivel, M.A.G., Borges, L.G.A., Simao, T.L.L., et al. (2018). Microbial diversity from chlorophyll maximum, oxygen minimum and bottom zones in the southwestern Atlantic Ocean. Journal of Marine Systems. 178. 52-61.
Status: Published
Iglesias, R.S., Ketzer, J.M., Maraschin, A.J., Sbrissa, G. (2018). Characterization and modeling of CO2‐water‐rock interactions in Hygiene Sandstones (Upper Cretaceous), Denver Basin, aimed for carbon dioxide geological storage. Greenhouse Gases : Science and Technology. 8 (4). 781-795.
Status: Published
Da S. Ramos, A., De Araujo, G.E., Siviero, L., Ketzer, J.M., Heemann, R., et al. (2018). Comparative assessment between different sample preparation methodologies for PTGA CO₂ adsorption assays—Pellet, powder, and fragment samples. Adsorption Science and Technology. 36 (7-8). 1441-1455.
Status: Published
Schütz, M.K., Lopes, N.F., Cenci, A., Ketzer, J.M., Einloft, S., et al. (2018). Influence of Alkaline Additives and Buffers on Mineral Trapping of CO₂ under Mild Conditions. Chemical Engineering & Technology. 41 (3). 573-579.
Status: Published
Müller Bicca, M., Philipp, R.P., Jelinek, A.R., Ketzer, J.M., Dos Santos Scherer, C.M., et al. (2017). Permian-Early Triassic tectonics and stratigraphy of the Karoo Supergroup in northwestern Mozambique. Journal of African Earth Sciences. 130. 8-27.
Status: Published
Dos Santos, V.H.J.M., Ketzer, J.M., Rodrigues, L.F. (2017). Classification of Fuel Blends Using Exploratory Analysis with Combined Data from Infrared Spectroscopy and Stable Isotope Analysis. Energy & Fuels. 31 (1). 523-532.
Status: Published
Medina-Silva, R., Oliviera, R.R., Trindade, F.J., Borges, L.G.A., Simao, T.L.L., et al. (2017). Microbiota associated with tubes of Escarpia sp. from cold seeps in the southwestern Atlantic Ocean constitutes a community distinct from that of surrounding marine sediment and water. Antonie van Leeuwenhoek. International Journal of General and Molecular Microbiology. 111 (4). 533-550.
Status: Published
Rodrigues, L.F., Ketzer, J.M., Lourega, R.V., Augustin, A.H., Sbrissa, G., et al. (2017). The influence of methane fluxes on the sulfate/methane interface in sediments from the Rio Grande Cone Gas Hydrate Province, southern Brazil : A influência dos fluxos de metano na interface sulfato/metano em sedimentos de hidrato de gás do Cone do Rio Grande, Sul do Brasil. Brazilian Journal of Geology. 47 (3). 369-381.
Status: Published
Engelmann, P.D.M., Dos Santos, V.H.J.M., Moser, L.I., Do Canto Bruzza, E., Barbieri, C.B., et al. (2017). Environmental monitoring of water resources around a municipal landfill of the Rio Grande do Sul state, Brazil. Environmental Science and Pollution Research. 24 (26). 21398-21411.
Status: Published
Dos Santos, V.H.J.M., Ramos, A.S., Pires, J.P., Engelmann, P.D.M., Lourega, R.V., et al. (2017). Discriminant analysis of biodiesel fuel blends based on combined data from Fourier Transform Infrared Spectroscopy and stable carbon isotope analysis. Chemometrics and Intelligent Laboratory Systems. 161. 70-78.
Status: Published
Siqueira, T.A., Iglesias, R.S., Ketzer, J.M. (2017). Carbon dioxide injection in carbonate reservoirs : a review of CO2-water-rock interaction studies. Greenhouse Gases : Science and Technology. 7 (5). 802-816.
Status: Published
Giongo, A., Haag, T., Lopes Simao, T.L., Medina-Silva, R., Utz, L.R.P., et al. (2016). Discovery of a chemosynthesis-based community in the western South Atlantic Ocean. Deep Sea Research Part I : Oceanographic Research Papers. 112. 45-56.
Status: Published
Ramos, A.D.S., Rodrigues, L.F., De Araujo, G.E., Pozocco, C.T.M., Ketzer, J.M., et al. (2015). Geochemical Characterization of Irati And Palermo Formations (Parana Basin-Southern Brazil) for Shale Oil/Gas Exploration. Energy Technology. 3 (5). 481-487.
Status: Published
Miller, D.J., Ketzer, J.M., Viana, A.R., Kowsmann, R.O., Freire, A.F.M., et al. (2015). Natural gas hydrates in the Rio Grande Cone (Brazil) : A new province in the western South Atlantic. Marine and Petroleum Geology. 67. 187-196.
Status: Published
Iglesias, R.S., Ketzer, J.M., Melo, C.L., Heemann, R., Machado, C.X. (2015). Carbon capture and geological storage in Brazil : an overview. Greenhouse Gases : Science and Technology. 5 (2). 119-130.
Status: Published
Rodrigues, L., Goudinho, F., Laroque, D., Lourega, R., Heemann, R., et al. (2014). An Alternative Gas Chromatography Setting for Geochemical Analysis.. Journal of Chemical Engineering & Process Technology. 5.
Status: Published
Santarosa, C.S., Crandall, D., Haljasmaa, I.V., Hur, T., Fazio, J.J., et al. (2013). CO₂ sequestration potential of Charqueadas coal field in Brazil. International Journal of Coal Geology. 106. 25-34.
Status: Published

Doctoral thesis, comprehensive summary (Other academic)

Ketzer, J.M. (2002). Diagenesis and Sequence Stratigraphy : an integrated approach to constrain evolution of reservoir quality in sandstones. Doctoral Thesis. Uppsala, Acta Universitatis Upsaliensis.

Chapter in book (Refereed)

Praeg, D., Migeon, S., Mascle, J., Unnithan, V., Ketzer, J.M. (2022). A Gas Hydrate System of Heterogeneous Character in the Nile Deep-Sea Fan. World Atlas of Submarine Gas Hydrates in Continental Margins. Springer. 437-447.
Ketzer, J.M., Viana, A., Miller, D., Augustin, A., Rodrigues, F., et al. (2022). Gas Hydrate Systems on the Brazilian Continental Margin. World Atlas of Submarine Gas Hydrates in Continental Margins. Springer. 343-352.
Ketzer, J.M., Iglesias, R., Einloft, S. (2017). Reducing Greenhouse Gas Emissions with CO₂ Capture and Geological Storage.. Handbook of climate change mitigation and adaptation.. Springer. 2197-2237.

Chapter in book (Other (popular science, discussion, etc.))

Cupertino, J.A., Augustin, A.H., Rodrigues, L.F., Ketzer, J.M., Viana, A.R., et al. (2022). Estado da arte das ocorrências de hidratos de gás ao longo da margem continental Brasileira. Economia azul - vetores para o desenvolvimento do Brasil.. Sao Paulo, Marinha do Brasil. 623-648.

Patent (Other (popular science, discussion, etc.))

Steiger, A.K., Ketzer, J.M. (2015). Equipment and process to manipulate and transfer fluid samples collected at high pressure (deep sea)..
Silva, I., Ketzer, J.M., Steiger, A. (2014). Device for collecting sample of fluids in underwater medium..

Collection (editor) (Other (popular science, discussion, etc.))

Ketzer, J.M., Machado, C., Rockett, G., Iglesias, R. (2016). Brazilian Atlas of CO₂ Capture and Geological Storage : Atlas Brazileiro de Captura e Armazenamento Geologico de CO₂. EDIPUCRS. 95.