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Non-closure of the surface energy balance explained by phase difference between vertical velocity and scalars of large atmospheric eddies

Title data

Gao, Zhongming ; Liu, Heping ; Katul, Gabriel ; Foken, Thomas:
Non-closure of the surface energy balance explained by phase difference between vertical velocity and scalars of large atmospheric eddies.
In: Environmental Research Letters. Vol. 12 (2017) Issue 3 . - No. 034025.
ISSN 1748-9326
DOI: https://doi.org/10.1088/1748-9326/aa625b

Abstract in another language

It is now accepted that large-scale turbulent eddies impact the widely reported non-closure of the surface energy balance when latent and sensible heat fluxes are measured using the eddy covariance method in the atmospheric surface layer (ASL). However, a mechanistic link between large eddies and non-closure of the surface energy balance remains a subject of inquiry. Here, measured 10 Hz time series of vertical velocity, air temperature, and water vapor density collected in the ASL are analyzed for conditions where entrainment and/or horizontal advection separately predominate. The series are decomposed into small- and large- eddies based on a frequency cutoff and their contributions to turbulent fluxes are analyzed. Phase difference between vertical velocity and water vapor density associated with large eddies reduces latent heat fluxes, especially in conditions where advection prevails. Enlarged phase difference of large eddies linked to entrainment or advection occurrence leads to increased residuals of the surface energy balance.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER140156
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
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 08:50
Last Modified: 08 Jan 2018 08:50
URI: https://eref.uni-bayreuth.de/id/eprint/41186