Search Results - "Aalto, J."

Statistical Forecasting of Current and Future Circum‐Arctic Ground Temperatures and Active Layer Thickness by Aalto, J., Karjalainen, O., Hjort, J., Luoto, M.

“…Mean annual ground temperature (MAGT) and active layer thickness (ALT) are key to understanding the evolution of the ground thermal state across the Arctic…”
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Soil Moisture Variations From Boreal Forests to the Tundra by Kemppinen, J., Niittynen, P., Rissanen, T., Tyystjärvi, V., Aalto, J., Luoto, M.

“…Soil moisture has a profound influence on life on Earth, and this vital water resource varies across space and time. Here, we explored soil moisture variations…”
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Chemodiversity of a Scots pine stand and implications for terpene air concentrations by Bäck, J, Aalto, J, Henriksson, M, Hakola, H, He, Q, Boy, M

“…Atmospheric chemistry in background areas is strongly influenced by natural vegetation. Coniferous forests are known to produce large quantities of volatile…”
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Biogeophysical controls on soil-atmosphere thermal differences: implications on warming Arctic ecosystems by Aalto, J, Scherrer, D, Lenoir, J, Guisan, A, Luoto, M

“…Soil temperature (ST) has a key role in Arctic ecosystem functioning and global environmental change. However, soil thermal conditions do not necessarily…”
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Annual cycle of volatile organic compound exchange between a boreal pine forest and the atmosphere by Rantala, P, Aalto, J, Taipale, R, Ruuskanen, T. M, Rinne, J

“…Long-term flux measurements of volatile organic compounds (VOC) over boreal forests are rare, although the forests are known to emit considerable amounts of…”
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Potku – New analysis software for heavy ion elastic recoil detection analysis by Arstila, K., Julin, J., Laitinen, M.I., Aalto, J., Konu, T., Kärkkäinen, S., Rahkonen, S., Raunio, M., Itkonen, J., Santanen, J.-P., Tuovinen, T., Sajavaara, T.

“…Time-of-flight elastic recoil detection (ToF-ERD) analysis software has been developed. The software combines a Python-language graphical front-end with a C…”
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The direct and indirect effects of watershed land use and soil type on stream water metal concentrations by Taka, M., Aalto, J., Virkanen, J., Luoto, M.

“…Identifying the factors controlling stream water pollutants is challenged by the diversity of potential sources, pathways, and processes. This study tests the…”
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Diversity and Selection of Surface Marine Microbiomes in the Atlantic-Influenced Arctic by Aalto, Nerea J., Schweitzer, Hannah D., Krsmanovic, Stina, Campbell, Karley, Bernstein, Hans C.

“…Arctic marine environments are experiencing rapid changes due to the polar amplification of global warming. These changes impact the habitat of the…”
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New foliage growth is a significant, unaccounted source for volatiles in boreal evergreen forests by Aalto, J, Kolari, P, Hari, P, Kerminen, V.-M, Schiestl-Aalto, P, Aaltonen, H, Levula, J, Siivola, E, Kulmala, M, Bäck, J

“…Estimates of volatile organic compound (VOC) emissions from forests are based on the assumption that foliage has a steady emission potential over its lifetime,…”
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Long-term sub-micrometer aerosol chemical composition in the boreal forest: inter- and intra-annual variability by Heikkinen, Liine, Ãijälä, Mikko, Riva, Matthieu, Luoma, Krista, Dällenbach, Kaspar, Aalto, Juho, Aalto, Pasi, Aliaga, Diego, Aurela, Minna, Keskinen, Helmi, Makkonen, Ulla, Rantala, Pekka, Kulmala, Markku, Petäjä, Tuukka, Worsnop, Douglas, Ehn, Mikael

“…The Station for Measuring Ecosystem–Atmosphere Relations (SMEAR) II is well known among atmospheric scientists due to the immense amount of observational data…”
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Tree water relations can trigger monoterpene emissions from Scots pine stems during spring recovery by Vanhatalo, A, Chan, T, Aalto, J, Korhonen, J. F, Kolari, P, Hölttä, T, Nikinmaa, E, Bäck, J

“…Tree canopies are known to emit large amounts of VOCs (volatile organic compounds) such as monoterpenes into the surrounding air. High VOC emission rates from…”
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Diurnal patterns in Scots pine stem oleoresin pressure in a boreal forest by Rissanen, K, Hölttä, T, Vanhatalo, A, Aalto, J, Nikinmaa, E, Rita, H, Bäck, J

“…Coniferous tree stems contain large amounts of oleoresin under positive pressure in the resin ducts. Studies in North‐American pines indicated that the stem…”
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Sources of long-lived atmospheric VOCs at the rural boreal forest site, SMEAR II by Patokoski, J, Ruuskanen, T. M, Kajos, M. K, Taipale, R, Rantala, P, Aalto, J, Ryyppö, T, Nieminen, T, Hakola, H, Rinne, J

“…In this study a long-term volatile organic compound (VOCs) concentration data set, measured at the SMEAR II (Station for Measuring Ecosystem–Atmosphere…”
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Continuous VOC flux measurements on boreal forest floor by Aaltonen, H., Aalto, J., Kolari, P., Pihlatie, M., Pumpanen, J., Kulmala, M., Nikinmaa, E., Vesala, T., Bäck, J.

“…Background and Aims Volatile organic compound (VOC) emissions from biogenic sources are important contributors to chemical reactions in the air. Soil/forest…”
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Molecular composition of biogenic secondary organic aerosols using ultrahigh-resolution mass spectrometry: comparing laboratory and field studies by Kourtchev, I., Fuller, S. J., Giorio, C., Healy, R. M., Wilson, E., O'Connor, I., Wenger, J. C., McLeod, M., Aalto, J., Ruuskanen, T. M., Maenhaut, W., Jones, R., Venables, D. S., Sodeau, J. R., Kulmala, M., Kalberer, M.

“…Numerous laboratory experiments have been performed in an attempt to mimic atmospheric secondary organic aerosol (SOA) formation. However, it is still unclear…”
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Climate and land-use change drive population decline in a red-listed plant species by Suppula, M., Hällfors, M.H., Aapala, K., Aalto, J., Kemppainen, E., Leikola, N., Pirinen, P., Heikkinen, R.K.

“…Land-use change is a perennial driver of biodiversity decline. However, climate change may pose novel pressures on species populations, adding to the mixture…”
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Onset of photosynthesis in spring speeds up monoterpene synthesis and leads to emission bursts by Aalto, J., Porcar‐Castell, A., Atherton, J., Kolari, P., Pohja, T., Hari, P., Nikinmaa, E., PetÄJÄ, T., Bäck, J.

“…Emissions of biogenic volatile organic compounds (BVOC) by boreal evergreen trees have strong seasonality, with low emission rates during photosynthetically…”
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Water relations in silver birch during springtime: How is sap pressurised? by Hölttä, T, Dominguez Carrasco, M D R, Salmon, Y, Aalto, J, Vanhatalo, A, Bäck, J, Lintunen, A

“…Positive sap pressures are produced in the xylem of birch trees in boreal conditions during the time between the thawing of the soil and bud break. During this…”
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Drivers of Atmosphere-Ocean CO2 Flux in Northern Norwegian Fjords by Aalto, Nerea J., Campbell, Karley, Eilertsen, Hans C., Bernstein, Hans C.

“…High-latitude fjords and continental shelves are shown to be sinks for atmospheric CO 2 , yet large spatial-temporal variability and poor regional coverage of…”
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Ambient measurements of aromatic and oxidized VOCs by PTR-MS and GC-MS: intercomparison between four instruments in a boreal forest in Finland by Kajos, M. K, Rantala, P, Hill, M, Hellén, H, Aalto, J, Patokoski, J, Taipale, R, Hoerger, C. C, Reimann, S, Ruuskanen, T. M, Rinne, J, Petäjä, T

“…Proton transfer reaction mass spectrometry (PTR-MS) and gas chromatography mass spectrometry GC-MS) are commonly used methods for automated in situ…”
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