Standardisation of eddy-covariance flux measurements of methane and nitrous oxide

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Nemitz , E , Mammarella , I , Ibrom , A , Aurela , M , Burba , G G , Dengel , S , Gielen , B , Grelle , A , Heinesch , B , Herbst , M , Hörtnagl , L , Klemedtsson , L , Lindroth , A , Lohila , A , McDermitt , D K , Meier , P , Merbold , L , Nelson , D , Nicolini , G , Nilsson , M B , Peltola , O , Rinne , J & Zahniser , M 2018 , ' Standardisation of eddy-covariance flux measurements of methane and nitrous oxide ' , International Agrophysics , vol. 32 , no. 4 , pp. 517-549 . https://doi.org/10.1515/intag-2017-0042

Title: Standardisation of eddy-covariance flux measurements of methane and nitrous oxide
Author: Nemitz, Eiko; Mammarella, Ivan; Ibrom, Andreas; Aurela, Mika; Burba, George G.; Dengel, Sigrid; Gielen, Bert; Grelle, Achim; Heinesch, Bernard; Herbst, Mathias; Hörtnagl, Lukas; Klemedtsson, Leif; Lindroth, Anders; Lohila, Annalea; McDermitt, Dayle K.; Meier, Philip; Merbold, Lutz; Nelson, David; Nicolini, Giacomo; Nilsson, Mats B.; Peltola, Olli; Rinne, Janne; Zahniser, Mark
Contributor: University of Helsinki, INAR Physics
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, University of Lund
Date: 2018-12
Language: eng
Number of pages: 39
Belongs to series: International Agrophysics
ISSN: 0236-8722
URI: http://hdl.handle.net/10138/294755
Abstract: Commercially available fast-response analysers for methane (CH4) and nitrous oxide (N2O) have recently become more sensitive, more robust and easier to operate. This has made their application for long-term flux measurements with the eddycovariance method more feasible. Unlike for carbon dioxide (CO2) and water vapour (H2O), there have so far been no guidelines on how to optimise and standardise the measurements. This paper reviews the state-of-the-art of the various steps of the measurements and discusses aspects such as instrument selection, setup and maintenance, data processing as well as the additional measurements needed to aid interpretation and gap-filling. It presents the methodological protocol for eddy covariance measurements of CH4 and N2O fluxes as agreed for the ecosystem station network of the pan-European Research Infrastructure Integrated Carbon Observation System and provides a first international standard that is suggested to be adopted more widely. Fluxes can be episodic and the processes controlling the fluxes are complex, preventing simple mechanistic gap-filling strategies. Fluxes are often near or below the detection limit, requiring additional care during data processing. The protocol sets out the best practice for these conditions to avoid biasing the results and long-term budgets. It summarises the current approach to gap-filling.
Subject: ICOS
protocol
micrometeorology
greenhouse gas exchange
standardisation
GREENHOUSE-GAS FLUXES
TUNABLE DIODE-LASER
CARBON-DIOXIDE FLUXES
MULTISCALE TEMPORAL VARIATION
N2O FLUXES
WATER-VAPOR
SPATIAL VARIABILITY
STATIC CHAMBER
GROWING-SEASON
NET CARBON
114 Physical sciences
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