Titlebar

Export bibliographic data
Literature by the same author
plus on the publication server
plus at Google Scholar

 

Forest Climate in Vertical and Horizontal Scales

Title data

Hübner, Jörg ; Siebicke, Lukas ; Lüers, Johannes ; Foken, Thomas:
Forest Climate in Vertical and Horizontal Scales.
In: Foken, Thomas (ed.): Energy and Matter Fluxes of a Spruce Forest Ecosystem. - Cham : Springer , 2017 . - pp. 331-353 . - (Ecological Studies ; 229 )
ISBN 978-3-319-49387-9
DOI: https://doi.org/10.1007/978-3-319-49389-3_14

Abstract in another language

Microclimate was investigated within a heterogeneous spruce forest in Northern Bavaria, Germany, at theWaldstein-Weidenbrunnen site, especially during the EGER project in 2007, 2008 and 2011. Besides standard tower measurements, two innovative measuring techniques were used to investigate horizontal and vertical gradients. A particular focus was paid to advection within the homogeneous part and its effect on net ecosystem exchange, as well as gradients near a forest edge, measured by a mobile measuring system. The forest canopy shields the below-canopy trunk space and therefore huge gradients are prevalent. However, vertical exchange is PAI-dependent and thus small gaps in the canopy (‘sunny spots’) can facilitate vertical exchange by coherent structures and alter the CO2 concentration within the trunk space. The coupling of different canopy layers also plays an important role in altering trunk space conditions. Decoupling leads to an enrichment of CO2 close to the ground with large katabatic drainage, and coupling leads to depletion. Furthermore, the investigations showed that horizontal and vertical advection contributes significantly to the net ecosystem exchange at the Waldstein-Weidenbrunnen site, especially during nighttime and transition periods. The investigations in 2011 showed that clearings, with their forest edges, play a key role in vertical exchange in heterogeneous forests. Roughness changes and thermal differences between forests and clearings facilitate downdrafts (during night) and updrafts (during day). This leads to the highest variations in turbulent influenced quantities, like temperature, humidity and trace gas concentrations directly at the forest edge, for example. Additionally, the formation of a secondary circulation system is possible above the clearing during midday, with effects on horizontal gradients.

Further data

Item Type: Article in a book
Refereed: No
Additional notes: BAYCEER139902
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professorship Micrometeorology
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Former Professors > Professorship Micrometeorology - Univ.-Prof. Dr. Thomas Foken
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Former Professors > Professorship Climatology - Univ.-Prof. Dr. Johannes Lüers
Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Former Professors
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 08 Jan 2018 10:48
Last Modified: 08 Jan 2018 10:48
URI: https://eref.uni-bayreuth.de/id/eprint/41198