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Boundary-Layer Meteorology

, Volume 166, Issue 3, pp 449–473 | Cite as

High-Resolution Vertical Profile Measurements for Carbon Dioxide and Water Vapour Concentrations Within and Above Crop Canopies

Research Article
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Abstract

We present a portable elevator-based facility for measuring \(\hbox {CO}_{2}\), water vapour, temperature and wind-speed profiles between the soil surface and the atmospheric surface layer above crop canopies. The end of a tube connected to a closed-path gas analyzer is continuously moved up and down over the profile range (in our case, approximately 2 m) while concentrations are logged at a frequency of \(20 \hbox { s}^{-1}\). Using campaign measurements in winter wheat, winter barley and a catch crop mixture (spring 2015 to autumn 2016) during different stages of crop development and different times of the day, we demonstrate a simple approach to correct for time lags, and the resulting profiles of 30-min mean mole fractions of \(\hbox {CO}_{2}\) and \(\hbox {H}_{2}\hbox {O}\) over height increments of 0.025 m. The profiles clearly show the effects of soil respiration and photosynthetic carbon assimilation, varying both during the diurnal cycle and during the growing season. Profiles of temperature and wind speed are based on a ventilated finewire thermocouple and a hot-wire anemometer, respectively. Measurements over bare soil and a short plant canopy were analyzed in the framework of Monin–Obukhov similarity theory to check the validity of the measurements and raw-data-processing approach. Derived fluxes of \(\hbox {CO}_{2}\), latent and sensible heat and momentum show good agreement with eddy-covariance measurements.

Keywords

Elevator Evapotranspiration Monin–Obukhov similarity theory Respiration 

Notes

Acknowledgements

This study was financed by the German Federal Ministry of Education and Research (BMBF) in the framework of the project “IDAS-GHG” (FKZ 01LN1313A). Ancillary hardware and its maintenance was supported by TERENO and the DFG Collaborative Research Centre 32 “Patterns in Soil-Vegetation-Atmosphere Systems”. We gratefully thank Normen Hermes for developing the control electronics for the elevator system, Yannick Tolsdorf for assistance with it, Nicole Adels, Odilia Esser, Daniel Dolfus and Marius Schmidt for conducting most of the eddy covariance, chamber and PAI fieldwork and analyses and four anonymous reviewers and the editor for thorough screening of and constructive comments on the manuscript.

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© Springer Science+Business Media B.V. 2017

Authors and Affiliations

  1. 1.Agrosphere (IBG-3), Institute of Bio- and GeosciencesJülich Research CentreJülichGermany

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