Home About Browse Search
Svenska


CloudRoots: integration of advanced instrumental techniques and process modelling of sub-hourly and sub-kilometre land-atmosphere interactions

Vilà-Guerau de Arellano, Jordi and Ney, Patrizia and Hartogensis, Oscar and de Boer, Hugo and van Diepen, Kevin and Emin, Dzhaner and de Groot, Geiske and Klosterhalfen, Anne and Langensiepen, Matthias and Matveeva, Maria and Miranda-García, Gabriela and Moene, Arnold F. and Rascher, Uwe and Röckmann, Thomas and Adnew, Getachew and Brüggemann, Nicolas and Rothfuss, Youri and Graf, Alexander (2020). CloudRoots: integration of advanced instrumental techniques and process modelling of sub-hourly and sub-kilometre land-atmosphere interactions. Biogeosciences. 17 , 4375–4404
[Journal article]

[img] PDF
4MB

Abstract

The CloudRoots field experiment was designed to obtain a comprehensive observational dataset that includes soil, plant, and atmospheric variables to investigate the interaction between a heterogeneous land surface and its overlying atmospheric boundary layer at the sub-hourly and sub-kilometre scale. Our findings demonstrate the need to include measurements at leaf level to better understand the relations between stomatal aperture and evapotranspiration (ET) during the growing season at the diurnal scale. Based on these observations, we obtain accurate parameters for the mechanistic representation of photosynthesis and stomatal aperture. Once the new parameters are implemented, the model reproduces the stomatal leaf conductance and the leaf-level photosynthesis satisfactorily. At the canopy scale, we find a consistent diurnal pattern on the contributions of plant transpiration and soil evaporation using different measurement techniques. From highly resolved vertical profile measurements of carbon dioxide (CO2) and other state variables, we infer a profile of the CO2 assimilation in the canopy with non-linear variations with height. Observations taken with a laser scintillometer allow us to quantify the non-steadiness of the surface turbulent fluxes during the rapid changes driven by perturbation of photosynthetically active radiation by cloud flecks. More specifically, we find 2 min delays between the cloud radiation perturbation and ET. To study the relevance of advection and surface heterogeneity for the land–atmosphere interaction, we employ a coupled surface–atmospheric conceptual model that integrates the surface and upper-air observations made at different scales from leaf to the landscape. At the landscape scale, we calculate a composite sensible heat flux by weighting measured fluxes with two different land use categories, which is consistent with the diurnal evolution of the boundary layer depth. Using sun-induced fluorescence measurements, we also quantify the spatial variability of ET and find large variations at the sub-kilometre scale around the CloudRoots site. Our study shows that throughout the entire growing season, the wide variations in stomatal opening and photosynthesis lead to large diurnal variations of plant transpiration at the leaf, plant, canopy, and landscape scales. Integrating different advanced instrumental techniques with modelling also enables us to determine variations of ET that depend on the scale where the measurement were taken and on the plant growing stage.

Authors/Creators:Vilà-Guerau de Arellano, Jordi and Ney, Patrizia and Hartogensis, Oscar and de Boer, Hugo and van Diepen, Kevin and Emin, Dzhaner and de Groot, Geiske and Klosterhalfen, Anne and Langensiepen, Matthias and Matveeva, Maria and Miranda-García, Gabriela and Moene, Arnold F. and Rascher, Uwe and Röckmann, Thomas and Adnew, Getachew and Brüggemann, Nicolas and Rothfuss, Youri and Graf, Alexander
Title:CloudRoots: integration of advanced instrumental techniques and process modelling of sub-hourly and sub-kilometre land-atmosphere interactions
Year of publishing :2020
Volume:17
Page range:4375–4404
Number of Pages:30
Publisher:Copernicus Publications
ISSN:1726-4170
Language:English
Publication Type:Journal article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Meteorology and Atmospheric Sciences
URN:NBN:urn:nbn:se:slu:epsilon-p-107351
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-107351
Additional ID:
Type of IDID
DOI10.5194/bg-17-4375-2020
ID Code:17526
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Forest Ecology and Management
Deposited By: SLUpub Connector
Deposited On:22 Sep 2020 10:00
Metadata Last Modified:22 Sep 2020 10:00

Repository Staff Only: item control page

Downloads

Downloads per year (since September 2012)

View more statistics

Downloads
Hits