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Relaxed Eddy Accumulation System for Size-Resolved Aerosol Particle Flux Measurements

Source: Journal of Atmospheric and Oceanic Technology:;2004:;volume( 021 ):;issue: 006:;page 933

Author(s): Gaman, Anca; Rannik, Üllar; Aalto, Pasi; Pohja, Toivo; Siivola, Erkki; Kulmala, Markku; Vesala, Timo

Publisher: American Meteorological Society

Abstract: A novel relaxed eddy accumulation (REA) system for aerosol particle flux measurement has been developed and tested. The system consisted of a fast-response sonic anemometer, a flow system, and software for operating the ...

Relative Humidity Effect on the High-Frequency Attenuation of Water Vapor Flux Measured by a Closed-Path Eddy Covariance System

Source: Journal of Atmospheric and Oceanic Technology:;2009:;volume( 026 ):;issue: 009:;page 1856

Author(s): Mammarella, Ivan; Launiainen, Samuli; Gronholm, Tiia; Keronen, Petri; Pumpanen, Jukka; Rannik, Üllar; Vesala, Timo

Publisher: American Meteorological Society

Abstract: In this study the high-frequency loss of carbon dioxide (CO2) and water vapor (H2O) fluxes, measured by a closed-path eddy covariance system, were studied, and the related correction factors through the cospectral transfer ...

Sorption-Caused Attenuation and Delay of Water Vapor Signals in Eddy-Covariance Sampling Tubes and Filters

Source: Journal of Atmospheric and Oceanic Technology:;2014:;volume( 031 ):;issue: 012:;page 2629

Author(s): Nordbo, Annika; Kekäläinen, Pekka; Siivola, Erkki; Mammarella, Ivan; Timonen, Jussi; Vesala, Timo

Publisher: American Meteorological Society

Abstract: dsorption and desorption (together called sorption) processes in sampling tubes and filters of eddy-covariance stations cause attenuation and delay of water vapor signals, leading to an underestimation of water vapor fluxes ...

FLUXNET: A New Tool to Study the Temporal and Spatial Variability of Ecosystem–Scale Carbon Dioxide, Water Vapor, and Energy Flux Densities

Source: Bulletin of the American Meteorological Society:;2001:;volume( 082 ):;issue: 011:;page 2415

Author(s): Baldocchi, Dennis; Falge, Eva; Gu, Lianhong; Olson, Richard; Hollinger, David; Running, Steve; Anthoni, Peter; Bernhofer, Ch; Davis, Kenneth; Evans, Robert; Fuentes, Jose; Goldstein, Allen; Katul, Gabriel; Law, Beverly; Lee, Xuhui; Malhi, Yadvinder; Meyers, Tilden; Munger, William; Oechel, Walt; Paw, K. T.; Pilegaard, Kim; Schmid, H. P.; Valentini, Riccardo; Verma, Shashi; Vesala, Timo; Wilson, Kell; Wofsy, Steve

Publisher: American Meteorological Society

Abstract: FLUXNET is a global network of micrometeorological flux measurement sites that measure the exchanges of carbon dioxide, water vapor, and energy between the biosphere and atmosphere. At present over 140 sites are operating ...

The Helsinki Testbed: A Mesoscale Measurement, Research, and Service Platform

Source: Bulletin of the American Meteorological Society:;2010:;volume( 092 ):;issue: 003:;page 325

Author(s): Koskinen, Jarkko T.; Poutiainen, Jani; Schultz, David M.; Joffre, Sylvain; Koistinen, Jarmo; Saltikoff, Elena; Gregow, Erik; Turtiainen, Heikki; Dabberdt, Walter F.; Damski, Juhani; Eresmaa, Noora; Göke, Sabine; Hyvärinen, Otto; Järvi, Leena; Karppinen, Ari; Kotro, Janne; Kuitunen, Timo; Kukkonen, Jaakko; Kulmala, Markku; Moisseev, Dmitri; Nurmi, Pertti; Pohjola, Heikki; Pylkkö, Pirkko; Vesala, Timo; Viisanen, Yrjö

Publisher: American Meteorological Society

Abstract: The Finnish Meteorological Institute and Vaisala have established a mesoscale weather observational network in southern Finland. The Helsinki Testbed is an open research and quasi-operational program designed to provide ...

FLUXNET-CH4 Synthesis Activity: Objectives, Observations, and Future Directions

Source: Bulletin of the American Meteorological Society:;2020:;volume( 100 ):;issue: 012:;page 2607

Author(s): Knox, Sara H.;Jackson, Robert B.;Poulter, Benjamin;McNicol, Gavin;Fluet-Chouinard, Etienne;Zhang, Zhen;Hugelius, Gustaf;Bousquet, Philippe;Canadell, Josep G.;Saunois, Marielle;Papale, Dario;Chu, Housen;Keenan, Trevor F.;Baldocchi, Dennis;Torn, Margaret S.;Mammarella, Ivan;Trotta, Carlo;Aurela, Mika;Bohrer, Gil;Campbell, David I.;Cescatti, Alessandro;Chamberlain, Samuel;Chen, Jiquan;Chen, Weinan;Dengel, Sigrid;Desai, Ankur R.;Euskirchen, Eugenie;Friborg, Thomas;Gasbarra, Daniele;Goded, Ignacio;Goeckede, Mathias;Heimann, Martin;Helbig, Manuel;Hirano, Takashi;Hollinger, David Y.;Iwata, Hiroki;Kang, Minseok;Klatt, Janina;Krauss, Ken W.;Kutzbach, Lars;Lohila, Annalea;Mitra, Bhaskar;Morin, Timothy H.;Nilsson, Mats B.;Niu, Shuli;Noormets, Asko;Oechel, Walter C.;Peichl, Matthias;Peltola, Olli;Reba, Michele L.;Richardson, Andrew D.;Runkle, Benjamin R. K.;Ryu, Youngryel;Sachs, Torsten;Schäfer, Karina V. R.;Schmid, Hans Peter;Shurpali, Narasinha;Sonnentag, Oliver;Tang, Angela C. I.;Ueyama, Masahito;Vargas, Rodrigo;Vesala, Timo;Ward, Eric J.;Windham-Myers, Lisamarie;Wohlfahrt, Georg;Zona, Donatella

Publisher: American Meteorological Society

Abstract: This paper describes the formation of, and initial results for, a new FLUXNET coordination network for ecosystem-scale methane (CH4) measurements at 60 sites globally, organized by the Global Carbon Project in partnership ...