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A semi-empirical model of the energy balance closure in the surface layer

De Roo, Frederik; Zhang, Sha; Huq, Sadiq; Mauder, Matthias

Abstract:
It has been hypothesized that the energy balance closure problem of single-tower eddy-covariance measurements is linked to large-scale turbulent transport. In order to shed light on this problem, we investigate the functional dependence of the normalized residual for the potential temperature and humidity conservation equations, i.e. the imbalance ratio for the fluxes of latent and sensible heat. We set up a suite of simulations consisting of cases with different stability and surface Bowen ratio. We employ a nesting approach in the lower part of the atmospheric boundary-layer to achieve higher spatial resolution near the surface. Our simulations reproduce earlier simulation results for the mixed layer and also mimic the saw-blade pattern of real flux measurements. Focusing on homogeneous terrain, we derive a parameterization for the spatially averaged flux imbalance ratios of latent and sensible heat in the surface layer. We also investigate how the remaining imbalance for a given point measurement is related to the local turbulence, by deriving a statistical model based on turbulence characteristics that are related to large-scale turbulence. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000088747
Veröffentlicht am 19.12.2018
Originalveröffentlichung
DOI: 10.1371/journal.pone.0209022
Coverbild
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung (IMK-IFU)
Publikationstyp Zeitschriftenaufsatz
Jahr 2018
Sprache Englisch
Identifikator ISSN: 1932-6203
urn:nbn:de:swb:90-887477
KITopen-ID: 1000088747
HGF-Programm 12.02.05 (POF III, LK 01)
Erschienen in PLOS ONE
Band 13
Heft 12
Seiten Article: e0209022
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Vorab online veröffentlicht am 12.12.2018
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