Ground-Based Optical Measurements at European Flux Sites: A Review of Methods, Instruments and Current Controversies

Manuela Balzarolo, Karen Anderson, Caroline Nichol, Micol Rossini, Loris Vescovo, Nicola Arriga, Georg Wohlfahrt, Jean-Christophe Calvet, Arnaud Carrara, Sofia Cerasoli, Sergio Cogliati, Fabrice Daumard, Lars Eklundh, Jan A. Elbers, Fatih Evrendilek, Rebecca N. Handcock, Joerg Kaduk, Katja Klumpp, Bernard Longdoz, Giorgio MatteucciMichele Meroni, Lenoardo Montagnani, Jean-Marc Ourcival, Enrique P. Sanchez-Canete, Jean-Yves Pontailler, Radoslaw Juszczak, Bob Scholes, M. Pilar Martin

Research output: Contribution to journalLiterature reviewpeer-review

Abstract

This paper reviews the currently available optical sensors, their limitations and opportunities for deployment at Eddy Covariance (EC) sites in Europe. This review is based on the results obtained from an online survey designed and disseminated by the Co-cooperation in Science and Technology (COST) Action ESO903-"Spectral Sampling Tools for Vegetation Biophysical Parameters and Flux Measurements in Europe" that provided a complete view on spectral sampling activities carried out within the different research teams in European countries. The results have highlighted that a wide variety of optical sensors are in use at flux sites across Europe, and responses further demonstrated that users were not always fully aware of the key issues underpinning repeatability and the reproducibility of their spectral measurements. The key findings of this survey point towards the need for greater awareness of the need for standardisation and development of a common protocol of optical sampling at the European EC sites.

Original languageEnglish
Pages (from-to)7954-7981
Number of pages28
JournalSensors
Volume11
Issue number8
DOIs
Publication statusPublished - Aug 2011

Keywords

  • optical measurements
  • sensors
  • protocol standardisation
  • European flux networks
  • VEGETATION INDEXES
  • SPECTRAL REFLECTANCE
  • CO2 FLUXES
  • PHOTOSYNTHETIC EFFICIENCY
  • NDVI MEASUREMENTS
  • RESOLUTION NDVI
  • CARBON-DIOXIDE
  • ECOSYSTEM
  • VALIDATION
  • FOOTPRINT

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