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A Physics-Based Universal Indicator for Vertical Decoupling and Mixing Across Canopies Architectures and Dynamic Stabilities

Title data

Peltola, O. ; Lapo, K. ; Thomas, C. K.:
A Physics-Based Universal Indicator for Vertical Decoupling and Mixing Across Canopies Architectures and Dynamic Stabilities.
In: Geophysical Research Letters. Vol. 48 (2021) Issue 5 . - e2020GL091615.
ISSN 1944-8007
DOI: https://doi.org/10.1029/2020GL091615

Official URL: Volltext

Project information

Project title:
Project's official titleProject's id
DarkMix - Illuminating the dark side of surface meteorology: creating a novel framework to explain atmospheric transport and turbulent mixing in the weak-wind boundary layer724629

Abstract in another language

Air flows may be decoupled from the underlying surface either due to strong stratification of air or due to canopy drag suppressing cross-canopy mixing. During decoupling, turbulent fluxes vary with height and hence identification of decoupled periods is crucial for the estimation of surface fluxes with the eddy covariance (EC) technique and computation of ecosystem-scale carbon, heat, and water budgets. A new indicator for identifying the decoupled periods is derived using forces (buoyancy and canopy drag) hindering movement of a downward propagating air parcel. This approach improves over the existing methods since (1) changes in forces hindering the coupling are accounted for, and (2) it is based on first principles and not on ad hoc empirical correlations. The applicability of the method is demonstrated at two contrasting EC sites (flat open terrain, boreal forest) and should be applicable also at other EC sites above diverse ecosystems (from grasslands to dense forests).

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: canopy; decoupling; flux, mixing; stable stratification; turbulence
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professor Micrometeorology
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professor Micrometeorology > Professor Micrometeorology - Univ.-Prof. Dr. Christoph K. Thomas
Profile Fields > Advanced Fields > Ecology and the Environmental Sciences
Profile Fields > Advanced Fields > Nonlinear Dynamics
Research Institutions > EU Research Projects > DarkMix
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Profile Fields
Profile Fields > Advanced Fields
Research Institutions
Research Institutions > EU Research Projects
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
500 Science > 550 Earth sciences, geology
Date Deposited: 20 Mar 2021 22:00
Last Modified: 29 Mar 2021 08:34
URI: https://eref.uni-bayreuth.de/id/eprint/64188