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Publikationer 1983 2019

2019

Influence of long term nitrogen limitation on lipid, protein and pigment production of Euglena gracilis in photoheterotrophic cultures

Tossavainen, M., Ilyass, U., Ollilainen, V., Valkonen, K., Ojala, A. & Romantschuk, M., 1 apr 2019, I : PeerJ. 7, 19 s., 6624.

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

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Rotifer communities under variable predation-turbulence combinations

Horppila, J., Härkönen, L., Hellén, N., Estlander, S., Pekcan-Hekim, Z. & Ojala, A., feb 2019, I : Hydrobiologia. 828, 1, s. 339-351 13 s.

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

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2018

Beavers affect carbon biogeochemistry: both short-term and long-term processes are involved.

Nummi, P. J., Vehkaoja, M. C., Pumpanen, J. S. & Ojala, A. K., okt 2018, I : Mammal Review. 48, 4, s. 298-311 14 s.

Forskningsoutput: TidskriftsbidragÖversiktsartikelVetenskapligPeer review

Conversion of biowaste leachate to valuable biomass and lipids in mixed cultures of Euglena gracilis and chlorophytes

Tossavainen, M., Katyal, N., Silja, K., Valkonen, K., Sharma, A. K., Sharma, S., Ojala, A. & Romantschuk, M., nov 2018, I : Algal Research. 35, s. 76-84 9 s.

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

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Effects of Climate Change on CO2 Concentration and Efflux in a Humic Boreal Lake: A Modeling Study

Kiuru, P., Ojala, A., Mammarella, I., Heiskanen, J., Kämäräinen, M., Vesala, T. & Huttula, T., jul 2018, I : Journal of Geophysical Research : Biogeosciences. 123, 7, s. 2212-2233 22 s.

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

Effects of similar weather patterns on the thermal stratification, mixing regimes and hypolimnetic oxygen depletion in two boreal lakes with different water transparency

Mammarella, I., Gavrylenko, G., Zdorovennova, G., Ojala, A., Erkkilä, K-M., Zdorovennov, R., Stepanyuk, O., Palshin, N., Terzhevik, A., Vesala, T. & Heiskanen, J., aug 2018, I : Boreal Environment Research. 23, s. 237-247 11 s.

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

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High-frequency productivity estimates for a lake from free-water CO2 concentration measurements

Provenzale, M., Ojala, A., Heiskanen, J., Erkkila, K-M., Mammarella, I., Hari, P. & Vesala, T., 9 apr 2018, I : Biogeosciences. 15, 7, s. 2021-2032 12 s.

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Methane and carbon dioxide fluxes over a lake: comparison between eddy covariance, floating chambers and boundary layer method

Erkkilä, K-M., Ojala, A., Bastviken, D., Biermann, T., Heiskanen, J. J., Lindroth, A., Peltola, O., Rantakari, M., Vesala, T. & Mammarella, I., 19 jan 2018, I : Biogeosciences. 15, 2, s. 429-445 17 s.

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Microalgae – Platform for conversion of waste to high value products

Tossavainen, P. M., 2018, Helsinki: University of Helsinki. 51 s.

Forskningsoutput: AvhandlingDoktorsavhandlingSamling av artiklar

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2017

Culturing of Selenastrum on diluted composting fluids; conversion of waste to valuable algal biomass in presence of bacteria

Tossavainen, M., Nykänen, A., Valkonen, K. S., Ojala, A., Silja, K. & Romantschuk, M., aug 2017, I : Bioresource Technology. 238, s. 205-213 9 s.

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Iron and pH regulating the photochemical mineralization of dissolved organic carbon

Gu, Y., Lensu, A., Perämäki, S., Ojala, A. K. & Vähätalo, A. V., maj 2017, I : ACS Omega. 2, s. 1905-1914

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Methylophilaceae and Hyphomicrobium as target taxonomic groups in monitoring the function of methanol-fed denitrification biofilters in municipal wastewater treatment plants

Rissanen, A. J., Ojala, A., Fred, T., Toivonen, J. & Tiirola, M., jan 2017, I : Journal of Industrial Microbiology and Biotechnology. 44, 1, s. 35-47 13 s.

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

Seasonal variation in nutrient removal efficiency of a boreal wetland detected by high-frequency on-line monitoring

Valkama, P., Mäkinen, E., Ojala, A., Vahtera, H., Lahti, K., Rantakokko, K., Vasander, H., Nikinmaa, E. & Wahlroos, O., jan 2017, I : Ecological Engineering. 98, s. 307-317 11 s.

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

2016

Atmosphere-land-lake carbon cycle provides possibilities for economic studies

Heiskanen, J. J., Mammarella, I., Ojala, A. K. & Vesala, T. V., 2016, I : Report Series in Aerosol Science. 180, s. 187-188 2 s.

Forskningsoutput: TidskriftsbidragKonferensartikelVetenskaplig

LAKE 2.0: A model for temperature, methane, carbon dioxide and oxygen dynamics in lakes

Stepanenko, V., Mammarella, I., Ojala, A. K., Miettinen, H. M., Lykosov, V. N. & Vesala, T. V., 2016, I : Geoscientific Model Development. 9, 5, s. 1977-2006 30 s.

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Methylophaga and Hyphomicrobium can be used as target genera in monitoring saline water methanol-utilizing denitrification

Rissanen, A. J., Ojala, A., Dernjatin, M., Jaakkola, J. & Tiirola, M., dec 2016, I : Journal of Industrial Microbiology and Biotechnology. 43, 12, s. 1647-1657 11 s.

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

Modeling nonlinear responses of DOC transport in boreal catchments in Sweden

Kasurinen, V., Alfredsen, K., Ojala, A., Pumpanen, J., Weyhenmeyer, G. A., Futter, M. N., Laudon, H. & Berninger, F., jul 2016, I : Water Resources Research. 52, 7, s. 4970-4989 20 s.

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

Nostetta suomalaiseen vesitutkimukseen

Ojala, A. K., dec 2016, I : energiaopas.net. s. 6 1 s.

Forskningsoutput: TidskriftsbidragArtikelAllmänheten

Real-time detection of arsenic cations from ambient air in boreal forest and lake environments

Faust, J. A., Junninen, H., Ehn, M., Chen, X., Ruusuvuori, K., Kieloaho, A-J., Bäck, J., Ojala, A., Jokinen, T., Worsnop, D. R., Kulmala, M. & Petäjä, T., feb 2016, I : Environmental Science & Technology Letters. 3, 2, s. 42-46 5 s.

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

2015

A process-based model for simulation of lake DIC and oxygen

Kiuru, P., Ojala, A. K., Mammarella, I. & Huttula, T., 2015, (Insänt) I : Boreal Environment Research.

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

Concentrations and quality of DOC along the terrestrial-aquatic continuum in a boreal forested catchment

Rasilo, T., Ojala, A., Huotari, J., Starr, M. & Pumpanen, J., 2015, I : Freshwater Science. 34, 2, s. 440-455 16 s.

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

Effects of water clarity on lake stratification and lake-atmosphere heat exchange

Heiskanen, J. J., Mammarella, I., Ojala, A., Stepanenko, V., Erkkila, K-M., Miettinen, H., Sandström, H., Eugster, W., Lepparanta, M., Jarvinen, H., Vesala, T. & Nordbo, A., 16 aug 2015, I : Journal of Geophysical Research : Atmospheres. 120, 15, s. 7412-7428 17 s.

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Urban wetland parks in Finland: improving water quality and creating endangered habitats

Wahlroos, O. M., Valkama, P., Mäkinen, E., Ojala, A., Vasander, H., Väänänen, V-M., Halonen, A., Linden, L., Nummi, P., Ahponen, H., Lahti, K., Vessman, T., Rantakokko, K. & Nikinmaa, E., 2015, I : International Journal of Biodiversity Science, Ecosystem Services & Management. 11, 1, s. 46-60 15 s.

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2014

Combined Effects of Turbulence and Different Predation Regimes on Zooplankton in Highly Colored Water-Implications for Environmental Change in Lakes

Härkönen, L., Pekcan-Hekim, Z., Hellen, N., Ojala, A. & Horppila, J., 2014, I : PLoS One. 9, 11, 13 s., 111942.

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Comparison on eddy covariance and floating chamber measurements of CO2 and CH4 fluxes over a boreal lake

Erkkilä, K-M., Gutierrez de los Rios, M. L., Heiskanen, J. J., Miettinen, H. M., Peltola, O. P., Ojala, A. K., Vesala, T. V. & Mammarella, I., nov 2014, Proceedings of 'the Center of Excellence in Atmospheric Sciences (CoE ATM) - From Molecular and Biological Processes to the Global Climate' Annual Meeting 2014. Aerosolitutkimusseura ry, s. 246-249 4 s. (Report Series in Aerosol Science; vol. 2014, nr. 157).

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskaplig

Effects of cooling and internal wave motions on gas transfer coefficients in a boreal lake

Heiskanen, J. J., Mammarella, I., Haapanala, S., Pumpanen, J., Vesala, T., Macintyre, S. & Ojala, A., 2014, I : Tellus. Series B: Chemical and Physical Meteorology. 66, 16 s., 22827.

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Greenhouse gases and micrometeorology research team: overview of scientific activities

Mammarella, I., Vesala, T., Alekseychik, P., Dengel, S., Erkkilä, K-M., Heiskanen, J., Keronen, P., Kolari, P., Nordbo, A., Peltola, O., Provenzale, M., Räsänen, M., Rannik, U., Aalto, T., Järvi, L., Laurila, T., Ojala, A., Tuittila, E-S., Levula, J., Praplan, A. & 4 andraPihlatie, M., Rinne, J., Pumpanen, J. & Bäck, J., 2014, Proceedings of 'the Center of Excellence in Atmospheric Sciences (CoE ATM) –From Molecular and Biological Processes to the Global Climate’ Annual Meeting 2014. Kulmala, M., Lintunen, A. & Kontkanen, J. (red.). Helsinki: Finnish Association for Aerosol Research, s. 99-105 7 s. (Report Series in Aerosol Science; vol. 157).

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskaplig

Increasing precipitation enhances the riverine transport of carbon but decreases the proportion of inorganic carbon

Rantakari, M. M., Kortelainen, P., Räike, A. & Ojala, A., 2014, (Insänt) I : Ecosystems.

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

Project for the measurement of greenhouse gas exchanges over lake Vanajavesi with the Eddy Covariance technique

Provenzale, M., Arvola, L. M. J., Mammarella, I., Ojala, A. K., Rantala, P. A. I. & Vesala, T. V., 2014, Proceedings of 'the Center of Excellence in Atmospheric Sciences (CoE ATM) –From Molecular and Biological Processes to the Global Climate’ Annual Meeting 2014. Kulmala, M., Lintunen, A. & Kontkanen, J. (red.). Helsinki: Finnish Association for Aerosol Research, s. 533-535 3 s. (Report Series in Aerosol Science; vol. 157).

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskaplig

2013

Changes in phytoplankton in a boreal lake during a 14-year period

Peltomaa, E., Ojala, A., Holopainen, A-L. & Salonen, K., 27 sep 2013, I : Boreal Environment Research. 18, 5, s. 387-400 14 s.

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Concentrations of CO2 and CH4 in water columns of two stratified boreal lakes during a year of atypical summer precipitation

López Bellido, J., Tulonen, T., Paula, K. & Ojala, A., 2013, I : Biogeochemistry. 113, 1-3, s. 613-627 15 s.

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

Contrasting CO2 concentration discharge dynamics in headwater streams: a multi-catchment comparison

Dinsmore, K. J., Wallin, M. B., Johnson, M. S., Billett, M. F., Bishop, K., Pumpanen, J. & Ojala, A., 2013, I : Journal of Geophysical Research : Biogeosciences. 118, 2, s. 445-461 17 s.

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Efficient gas exchange between a boreal river and the atmosphere

Huotari, J., Haapanala, S., Pumpanen, J., Vesala, T. & Ojala, A., 2013, I : Geophysical Research Letters. 40, 21, s. 5683-5686 4 s.

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

Emissions of volatile organic compounds from boreal humic lakes

Aaltonen, H., Hakola, H., Ojala, A., Klemedtsson, L., Pumpanen, J., Peltomaa, E. & Bäck, J., 2013, Proceedings of FCoE in 'Physics, Chemistry, Biology and Meteorology of Atmospheric Composition and Climate Change' Annual Meeting 2013. s. 152-154 3 s. (Report Series in Aerosol Science; vol. Nro 142 (2013)).

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskaplig

Evidence of lateral transport of carbon gases of terrestrial origin in boreal aquatic ecosystems

Ojala, A., Pumpanen, J., Rasilo, T., Miettinen, H., Rantakari, M. M., Heiskanen, J., Mammarella, I., Huotari, J., Kankaala, P., Levula, J., Bäck, J., Hari, P. & Vesala, T., 2013, Proceedings of FCoE in 'Physics, Chemistry, Biology and Meteorology of Atmospheric Composition and Climate Change' Annual Meeting 2013. s. 429-432 4 s. (Report Series in Aerosol Science; vol. Nro 142 (2013)).

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskaplig

Fatty acid composition as biomarkers of freshwater microalgae: analysis of 37 strains of microalgae in 22 genera and in seven classes

Taipale, S., Strandberg, U., Peltomaa, E., Galloway, A. W. E., Ojala, A. & Brett, M. T., 16 dec 2013, I : Aquatic Microbial Ecology. 71, 2, s. 165-178 14 s.

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

Interlake variation and environmental controls of denitrification across different geographical scales

Rissanen, A., Tiirola, M., Hietanen, S. & Ojala, A., 3 apr 2013, I : Aquatic Microbial Ecology. 69, 1, s. 1-16 16 s.

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

Lake-size dependent physical forcing drives carbon dioxide and methane effluxes from lakes in a boreal landscape

Kankaala, P., Huotari, J., Tulonen, T. & Ojala, A., 2013, I : Limnology and Oceanography. 58, 6, s. 1915-1930 16 s.

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

Long term measurements of carbon dioxide and methane fluxes over a small boreal lake in Southern Finland

Mammarella, I., Erkkilä, K-M., Haapanala, S., Heiskanen, J., Ojala, A. & Vesala, T., 2013, Proceedings of FCoE in 'Physics, Chemistry, Biology and Meteorology of Atmospheric Composition and Climate Change' Annual Meeting 2013. s. 381-385 5 s. (Report Series in Aerosol Science; vol. Nro 142 (2013)).

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskaplig

Production of different pelagic energy mobilisers in boreal lakes varies in relation to morphometry and concentration of dissolved organic carbon

Kankaala, P., López Bellido, J., Ojala, A., Tulonen, T. & Jones, R. I., 2013, I : Ecosystems. 16, 6, s. 1152-1164 12 s.

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review