Search Results - "Vesala, T"

Ozone Fluxes Over a Boreal Lake Exhibit Enhanced Deposition at Nights by Fung, P. L., Rannik, Ü., Mammarella, I., Vesala, T.

“…A few studies on ozone deposition over lake water are available and so far only one using the eddy covariance technique (Wesely et al., 1981,…”
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Plant mediated methane efflux from a boreal peatland complex by Korrensalo, A., Mammarella, I., Alekseychik, P., Vesala, T., Tuittila, E-S.

“…Purpose Aerenchymous plants are an important control for methane efflux from peatlands to the atmosphere, providing a bypass from the anoxic peat and avoiding…”
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Four-year (2006-2009) eddy covariance measurements of CO2 flux over an urban area in Beijing by Liu, H Z, Feng, J W, Järvi, L, Vesala, T

“…Long-term measurements of carbon dioxide flux (Fc ) and the latent and sensible heat fluxes were performed using the eddy covariance (EC) method in Beijing,…”
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Terrestrial biogeochemical feedbacks in the climate system by Arneth, A, Harrison, S. P, Zaehle, S, Tsigaridis, K, Menon, S, Bartlein, P. J, Feichter, J, Korhola, A, Kulmala, M, O'Donnell, D, Schurgers, G, Sorvari, S, Vesala, T

“…The terrestrial biosphere is a key regulator of atmospheric chemistry and climate. Total positive radiative forcing resulting from biogeochemical feedbacks…”
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Towards a standardized processing of Net Ecosystem Exchange measured with eddy covariance technique: algorithms and uncertainty estimation by Papale, D., Reichstein, M., Aubinet, M., Canfora, E., Bernhofer, C., Kutsch, W., Longdoz, B., Rambal, S., Valentini, R., Vesala, T., Yakir, D.

“…Eddy covariance technique to measure CO2, water and energy fluxes between biosphere and atmosphere is widely spread and used in various regional networks…”
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Temporal and among-site variability of inherent water use efficiency at the ecosystem level by Beer, C, Ciais, P, Reichstein, M, Baldocchi, D, Law, B.E, Papale, D, Soussana, J.F, Ammann, C, Buchmann, N, Frank, D, Gianelle, D, Janssens, I.A, Knohl, A, Köstner, B, Moors, E, Roupsard, O

“…Half‐hourly measurements of the net exchanges of carbon dioxide and water vapor between terrestrial ecosystems and the atmosphere provide estimates of gross…”
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Four-year (2006–2009) eddy covariance measurements of CO 2 flux over an urban area in Beijing by Liu, H. Z., Feng, J. W., Järvi, L., Vesala, T.

“…Long-term measurements of carbon dioxide flux (Fc) and the latent and sensible heat fluxes were performed using the eddy covariance (EC) method in Beijing,…”
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Europe-wide reduction in primary productivity caused by the heat and drought in 2003 by Friend, A. D, Valentini, R, Aubinet, M, Matteucci, G, Heinesch, B, Ciais, Ph, Allard, V, Soussana, J. F, Manca, G, Schulze, E. D, Viovy, N, Loustau, D, Ourcival, J. M, Papale, D, Bernhofer, Chr, Knohl, A, Buchmann, N, Grünwald, T, Krinner, G, Granier, A, Seufert, G, Ogée, J, Carrara, A, Miglietta, F, Chevallier, F, Friedlingstein, P, Reichstein, M, Keronen, P, De Noblet, N, Rambal, S, Pilegaard, K, Vesala, T, Sanz, M. J

“…Future climate warming is expected to enhance plant growth in temperate ecosystems and to increase carbon sequestration. But although severe regional heatwaves…”
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Seasonal and annual variation of carbon dioxide surface fluxes in Helsinki, Finland, in 2006–2010 by Järvi, L, Nordbo, A, Junninen, H, Riikonen, A, Moilanen, J, Nikinmaa, E, Vesala, T

“…Five years of carbon dioxide exchange measured with the eddy covariance technique at the world's northernmost urban flux station SMEAR III located in Helsinki,…”
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Testing the applicability of neural networks as a gap-filling method using CH4 flux data from high latitude wetlands by Dengel, S, Zona, D, Sachs, T, Aurela, M, Jammet, M, Parmentier, F J. W, Oechel, W, Vesala, T

“…Since the advancement in CH4 gas analyser technology and its applicability to eddy covariance flux measurements, monitoring of CH4 emissions is becoming more…”
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Boreal pine forest floor biogenic volatile organic compound emissions peak in early summer and autumn by Aaltonen, H., Pumpanen, J., Pihlatie, M., Hakola, H., Hellén, H., Kulmala, L., Vesala, T., Bäck, J.

“…► The boreal forest floor showed the clear emissions of BVOCs. ► Monoterpenes were the most emitted group, sesquiterpene emissions being minor. ► The fluxes of…”
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Comparison between eddy covariance and automatic chamber techniques for measuring net ecosystem exchange of carbon dioxide in cotton and wheat fields by Wang, K, Liu, C, Zheng, X, Pihlatie, M, Li, B, Haapanala, S, Vesala, T, Liu, H, Wang, Y, Liu, G, Hu, F

“…Static and transparent automatic chamber (AC) technique is a necessary choice for measuring net ecosystem exchange (NEE) of carbon dioxide (CO2) in…”
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Conceptual design of a measurement network of the global change by Hari, P, Petäjä, T, Bäck, J, Kerminen, V.-M, Lappalainen, H. K, Vihma, T, Laurila, T, Viisanen, Y, Vesala, T, Kulmala, M

“…The global environment is changing rapidly due to anthropogenic emissions and actions. Such activities modify aerosol and greenhouse gas concentrations in the…”
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Variable Physical Drivers of Near‐Surface Turbulence in a Regulated River by Guseva, S., Aurela, M., Cortés, A., Kivi, R., Lotsari, E., MacIntyre, S., Mammarella, I., Ojala, A., Stepanenko, V., Uotila, P., Vähä, A., Vesala, T., Wallin, M. B., Lorke, A.

“…Inland waters, such as lakes, reservoirs and rivers, are important sources of climate forcing trace gases. A key parameter that regulates the gas exchange…”
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Partitioning ozone fluxes between canopy and forest floor by measurements and a multi-layer model by Launiainen, S., Katul, G.G., Grönholm, T., Vesala, T.

“…► O3 fluxes and concentrations measured above and within a pine forest. ► Leaf and canopy scale stomatal O3 uptake estimated by a multi-layer model. ► O3…”
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Ozone deposition into a boreal forest over a decade of observations: evaluating deposition partitioning and driving variables by Rannik, Ã, Altimir, N, Mammarella, I, Bäck, J, Rinne, J, Ruuskanen, T. M, Hari, P, Vesala, T, Kulmala, M

“…This study scrutinizes a decade-long series of ozone deposition measurements in a boreal forest in search for the signature and relevance of the different…”
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Field intercomparison of four methane gas analyzers suitable for eddy covariance flux measurements by Peltola, O, Mammarella, I, Haapanala, S, Burba, G, Vesala, T

“…Performances of four methane gas analyzers suitable for eddy covariance measurements are assessed. The assessment and comparison was performed by analyzing…”
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Warming response of peatland CO2 sink is sensitive to seasonality in warming trends by Helbig, M., Živković, T., Alekseychik, P., Aurela, M., El-Madany, T. S., Euskirchen, E. S., Flanagan, L. B., Griffis, T. J., Hanson, P. J., Hattakka, J., Helfter, C., Hirano, T., Humphreys, E. R., Kiely, G., Kolka, R. K., Laurila, T., Leahy, P. G., Lohila, A., Mammarella, I., Nilsson, M. B., Panov, A., Parmentier, F. J. W., Peichl, M., Rinne, J., Roman, D. T., Sonnentag, O., Tuittila, E.-S, Ueyama, M., Vesala, T., Vestin, P., Weldon, S., Weslien, P., Zaehle, S.

“…Peatlands have acted as net CO 2 sinks over millennia, exerting a global climate cooling effect. Rapid warming at northern latitudes, where peatlands are…”
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Relationship between aerodynamic roughness length and bulk sedge leaf area index in a mixed‐species boreal mire complex by Alekseychik, P. K., Korrensalo, A., Mammarella, I., Vesala, T., Tuittila, E.‐S.

“…Leaf area index (LAI) is an important parameter in natural ecosystems, representing the seasonal development of vegetation and photosynthetic potential…”
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On the choice of the driving temperature for eddy-covariance carbon dioxide flux partitioning by Lasslop, G, Migliavacca, M, Bohrer, G, Reichstein, M, Bahn, M, Ibrom, A, Jacobs, C, Kolari, P, Papale, D, Vesala, T, Wohlfahrt, G, Cescatti, A

“…Networks that merge and harmonise eddy-covariance measurements from many different parts of the world have become an important observational resource for…”
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