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

Eiko Nemitz, Ivan Mammarella, Andreas Ibrom, Mika Aurela, George G. Burba, Sigrid Dengel, Bert Gielen, Achim Grelle, Bernard Heinesch, Mathias Herbst, Lukas Hörtnagl, Leif Klemedtsson, Anders Lindroth, Annalea Lohila, Dayle K. McDermitt, Philip Meier, Lutz Merbold, David Nelson, Giacomo Nicolini, Mats B. NilssonOlli Peltola, Janne Rinne, Mark Zahniser

Research output: Contribution to journalArticleScientificpeer-review

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.
Original languageEnglish
JournalInternational Agrophysics
Volume32
Issue number4
Pages (from-to)517-549
Number of pages39
ISSN0236-8722
DOIs
Publication statusPublished - Dec 2018
MoE publication typeA1 Journal article-refereed

Fields of Science

  • 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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