Search Results - "Pohja, T"

Technical Note: Quantitative long-term measurements of VOC concentrations by PTR-MS – measurement, calibration, and volume mixing ratio calculation methods by Taipale, R., Ruuskanen, T. M., Rinne, J., Kajos, M. K., Hakola, H., Pohja, T., Kulmala, M.

“…Proton transfer reaction mass spectrometry (PTR-MS) is a technique for online measurements of atmospheric concentrations, or volume mixing ratios, of volatile…”
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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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Basic characteristics of atmospheric particles, trace gases and meteorology in a relatively clean Southern African Savannah environment by Laakso, L., Laakso, H., Aalto, P. P., Keronen, P., Petäjä, T., Nieminen, T., Pohja, T., Siivola, E., Kulmala, M., Kgabi, N., Molefe, M., Mabaso, D., Phalatse, D., Pienaar, K., Kerminen, V.-M.

“…We have analyzed one year (July 2006–July 2007) of measurement data from a relatively clean background site located in dry savannah in South Africa. The…”
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Prescribed burning of logging slash in the boreal forest of Finland: emissions and effects on meteorological quantities and soil properties by Virkkula, A, Levula, J, Pohja, T, Aalto, P. P, Keronen, P, Schobesberger, S, Clements, C. B, Pirjola, L, Kieloaho, A.-J, Kulmala, L, Aaltonen, H, Patokoski, J, Pumpanen, J, Rinne, J, Ruuskanen, T, Pihlatie, M, Manninen, H. E, Aaltonen, V, Junninen, H, Petäjä, T, Backman, J, Dal Maso, M, Nieminen, T, Olsson, T, Grönholm, T, Aalto, J, Virtanen, T. H, Kajos, M, Kerminen, V.-M, Schultz, D. M, Kukkonen, J, Sofiev, M, De Leeuw, G, Bäck, J, Hari, P, Kulmala, M

“…A prescribed fire experiment was conducted on 26 June 2009 in Hyytiälä, Finland, to study aerosol and trace gas emissions from prescribed fires of slash fuels…”
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A look at aerosol formation using data mining techniques by Hyvönen, S., Junninen, H., Laakso, L., Dal Maso, M., Grönholm, T., Bonn, B., Keronen, P., Aalto, P., Hiltunen, V., Pohja, T., Launiainen, S., Hari, P., Mannila, H., Kulmala, M.

“…Atmospheric aerosol particle formation is frequently observed throughout the atmosphere, but despite various attempts of explanation, the processes behind it…”
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Transportable Aerosol Characterization Trailer with Trace Gas Chemistry: Design, Instruments and Verification by Petäjä, T., Vakkari, V., Pohja, T., Nieminen, T., Laakso, H., Aalto, P.P., Keronen, P., Siivola, E., Kerminen, V.-M., Kulmala, M., Laakso, L.

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Observations of ultrafine aerosol particle formation and growth in boreal forest by Mäkelä, J. M., Aalto, P., Jokinen, V., Pohja, T., Nissinen, A., Palmroth, S., Markkanen, T., Seitsonen, K., Lihavainen, H., Kulmala, M.

“…Number size distribution of ambient submicron and ultrafine aerosol particles have been measured on a continuous basis (every 10 minutes) for three quarters of…”
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An open chamber system for measuring soil surface CO2 efflux: Analysis of error sources related to the chamber system by Pumpanen, J., Ilvesniemi, H., Keronen, P., Nissinen, A., Pohja, T., Vesala, T., Hari, P.

“…An open dynamic chamber is a widely used method for soil CO2 efflux measurements. However, any uncontrolled air flow between the inside and outside of the…”
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improvement of the method for calibrating measurements of photosynthetic CO2 flux by Hari, P, Keronen, P, Back, J, Altimir, N, Linkosalo, T, Pohja, T, Kulmala, M, Vesala, T

“…Measurements of rapid changes in concentrations and fluxes of gaseous compounds relating to photosynthetic gas exchange are commonly performed using…”
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Onset of photosynthesis in spring speeds up monoterpene synthesis and leads to emission bursts: Photosynthesis recovery causes monoterpene 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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The summertime Boreal forest field measurement intensive (HUMPPA-COPEC-2010): an overview of meteorological and chemical influences by Williams, J., Crowley, J., Fischer, H., Harder, H., Martinez, M., Petäjä, T., Rinne, J., Bäck, J., Boy, M., Dal Maso, M., Hakala, J., Kajos, M., Keronen, P., Rantala, P., Aalto, J., Aaltonen, H., Paatero, J., Vesala, T., Hakola, H., Levula, J., Pohja, T., Herrmann, F., Auld, J., Mesarchaki, E., Song, W., Yassaa, N., Nölscher, A., Johnson, A. M., Custer, T., Sinha, V., Thieser, J., Pouvesle, N., Taraborrelli, D., Tang, M. J., Bozem, H., Hosaynali-Beygi, Z., Axinte, R., Oswald, R., Novelli, A., Kubistin, D., Hens, K., Javed, U., Trawny, K., Breitenberger, C., Hidalgo, P. J., Ebben, C. J., Geiger, F. M., Corrigan, A. L., Russell, L. M., Ouwersloot, H. G., Vilà-Guerau de Arellano, J., Ganzeveld, L., Vogel, A., Beck, M., Bayerle, A., Kampf, C. J., Bertelmann, M., Köllner, F., Hoffmann, T., Valverde, J., González, D., Riekkola, M.-L., Kulmala, M., Lelieveld, J.

“…This paper describes the background, instrumentation, goals, and the regional influences on the HUMPPA-COPEC intensive field measurement campaign, conducted at…”
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Experimental and numerical analysis of stomatal absorption of sulphur dioxide and transpiration by pine needles by Vesala, T., Hämeri, K., Ahonen, T., Kulmala, M., Hari, P., Pohja, T., Krissinel', E., Shokhirev, N., Lushnikov, A.A.

“…We present the experimental results of flow chamber measurements on SO 2 dry deposition, and of separate field measurements on transpiration of Scots pine (…”
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A photographic system for measuring shoot elongation in tree seedlings and relation to solar radiation and temperature by Kanninen, M, Pohja, T, Siivola, E

“…An automatic system has been developed to measure the variations in the rate of shoot elongation of tree seedlings. A camera equipped with 50 mm…”
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An open chamber system for measuring soil surface CO 2 efflux: Analysis of error sources related to the chamber system by Pumpanen, J., Ilvesniemi, H., Keronen, P., Nissinen, A., Pohja, T., Vesala, T., Hari, P.

“…An open dynamic chamber is a widely used method for soil CO 2 efflux measurements. However, any uncontrolled air flow between the inside and outside of the…”
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An open chamber system for measuring soil surface CO sub(2) efflux: Analysis of error sources related to the chamber system by Pumpanen, J, Ilvesniemi, H, Keronen, P, Nissinen, A, Pohja, T, Vesala, T, Hari, P

“…An open dynamic chamber is a widely used method for soil CO sub(2) efflux measurements. However, any uncontrolled air flow between the inside and outside of…”
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An improvement of the method for calibrating measurements of photosynthetic CO 2 flux by Hari, P., Keronen, P., Bäck, J., Altimir, N., Linkosalo, T., Pohja, T., Kulmala, M., Vesala, T.

“…ABSTRACT Measurements of rapid changes in concentrations and fluxes of gaseous compounds relating to photosynthetic gas exchange are commonly performed using…”
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An improvement of the method for calibrating measurements of photosynthetic CO sub(2) flux by Hari, P, Keronen, P, Baeck, J, Altimir, N, Linkosalo, T, Pohja, T, Kulmala, M, Vesala, T

“…Measurements of rapid changes in concentrations and fluxes of gaseous compounds relating to photosynthetic gas exchange are commonly performed using…”
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Continuous measurements of submicron particle size distribution at boreal forest station in southern Finland by Mäkelä, J.M., Kulmala, M., Aalto, P., Toivonen, A., Pohja, T.

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A station for forest ecological and atmospheric chemical measurements in Värriö by Ahonen, T, Aalto, P, Rannik, Ü, Vesala, T, Kulmala, M, Hari, P, Pohja, T

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Air pollution in eastern Lapland : challenge for an environmental measurement station by Hari, Pertti, Aalto, Pasi, Hämeri, Kaarle, Kulmala, Markku, Lahti, Tapani, Luoma, Sari, Palva, Lauri, Pohja, Toivo, Pulliainen, Erkki, Siivola, Erkki, Vesala, Timo

“…The Värriö environmental measurement station has been designed and constructed during 1991 and 1992. The measurement system consists of measurement units for…”
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