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The Effects of Surface Heterogeneity Scale on the Flux Imbalance under Free Convection
Zhou, YZ (Zhou, Yanzhao)1,2,3; Li, D (Li, Dan)4; Li, X (Li, Xin)1,5
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
2019
Volume124Issue:15Pages:8424-8448
DOI10.1029/2018JD029550
Abstract

It is well known that the available energy (i.e., the net radiation minus the ground heat flux) is often 10-30% larger than the sum of turbulent fluxes measured by the eddy-covariance method. Although field observations and previous large-eddy simulation studies have shown that surface heterogeneity can induce flux imbalance, the relationship between the flux imbalance magnitude and the surface heterogeneity scale remains to be investigated in more detail. Here we examine the flux imbalance over landscapes characterized by different surface heterogeneity scales in a dry freely convective boundary layer. We reveal that the flux imbalance initially increases with increasing surface heterogeneity scale. However, when the surface heterogeneity scale becomes larger than the boundary layer height, the surface starts to behave locally homogeneous, which leads to a lower flux imbalance. Based on large-eddy simulation results, we propose a conceptual model to explain how the domain average flux imbalance is influenced by surface heterogeneity. The flux imbalance is found to be controlled by the ratio of the boundary layer height to the Obukhov length (-z(i)/L), the integral length scale of vertical velocity (l(w)), the mean horizontal speed (U), and the time averaging interval (T). Among these four variables, l(w) determines the size of turbulent coherent structures (i.e., large eddies), whereas -z(i)/L affects the form of these large eddies. Meanwhile, the U and T determine how many these large eddies can be sampled by the eddy covariance. This finding indicates that it may be possible to diagnose the flux imbalance using these four variables under convective conditions.

Subject AreaAtmospheric Sciences
WOS IDWOS:000482475000004
Language英语
Indexed BySCI
KeywordEnergy-balance Closure Large-eddy Simulation Planetary Boundary-layer Land-surface Heat-flux Part i Long-term Impact Temperature Similarity
WOS Research AreaMeteorology & Atmospheric Sciences
WOS SubjectMeteorology & Atmospheric Sciences
Cooperation Status国内
URL查看原文
PublisherAMER GEOPHYSICAL UNION
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/9193
Collection图书馆
Corresponding AuthorLi, D (Li, Dan); Li, X (Li, Xin)
Affiliation1.Chinese Acad Sci, Inst Tibetan Plateau Res, Natl Tibetan Plateau Data Ctr, Beijing, Peoples R China;
2.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Remote Sensing Gansu Prov, Lanzhou, Gansu, Peoples R China;
3.Univ Chinese Acad Sci, Beijing, Peoples R China;
4.Boston Univ, Dept Earth & Environm, Boston, MA 02215 USA;
5.Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China.
Recommended Citation
GB/T 7714
Zhou, YZ ,Li, D ,Li, X . The Effects of Surface Heterogeneity Scale on the Flux Imbalance under Free Convection[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2019,124(15):8424-8448.
APA Zhou, YZ ,Li, D ,&Li, X .(2019).The Effects of Surface Heterogeneity Scale on the Flux Imbalance under Free Convection.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,124(15),8424-8448.
MLA Zhou, YZ ,et al."The Effects of Surface Heterogeneity Scale on the Flux Imbalance under Free Convection".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 124.15(2019):8424-8448.
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