Non-closure of the surface energy balance explained by phase difference between vertical velocity and scalars of large atmospheric eddies
Abstract
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. Furthermore, enlarged phase difference of large eddies linked to entrainment or advection occurrence leads to increased residuals of the surface energy balance.
- Authors:
- Publication Date:
- Research Org.:
- Washington State Univ., Pullman, WA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Biological and Environmental Research (BER)
- OSTI Identifier:
- 1347044
- Alternate Identifier(s):
- OSTI ID: 1355930
- Grant/Contract Number:
- SC0006967; SC0011461
- Resource Type:
- Published Article
- Journal Name:
- Environmental Research Letters
- Additional Journal Information:
- Journal Name: Environmental Research Letters Journal Volume: 12 Journal Issue: 3; Journal ID: ISSN 1748-9326
- Publisher:
- IOP Publishing
- Country of Publication:
- United Kingdom
- Language:
- English
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES; biochemical research methods; mathematical & computational biology; eddy covariance fluxes; large eddies; ensemble empirical mode decomposition; horizontal advection
Citation Formats
Gao, Zhongming, Liu, Heping, Katul, Gabriel G., and Foken, Thomas. Non-closure of the surface energy balance explained by phase difference between vertical velocity and scalars of large atmospheric eddies. United Kingdom: N. p., 2017.
Web. doi:10.1088/1748-9326/aa625b.
Gao, Zhongming, Liu, Heping, Katul, Gabriel G., & Foken, Thomas. Non-closure of the surface energy balance explained by phase difference between vertical velocity and scalars of large atmospheric eddies. United Kingdom. https://doi.org/10.1088/1748-9326/aa625b
Gao, Zhongming, Liu, Heping, Katul, Gabriel G., and Foken, Thomas. Thu .
"Non-closure of the surface energy balance explained by phase difference between vertical velocity and scalars of large atmospheric eddies". United Kingdom. https://doi.org/10.1088/1748-9326/aa625b.
@article{osti_1347044,
title = {Non-closure of the surface energy balance explained by phase difference between vertical velocity and scalars of large atmospheric eddies},
author = {Gao, Zhongming and Liu, Heping and Katul, Gabriel G. and Foken, Thomas},
abstractNote = {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. Furthermore, enlarged phase difference of large eddies linked to entrainment or advection occurrence leads to increased residuals of the surface energy balance.},
doi = {10.1088/1748-9326/aa625b},
journal = {Environmental Research Letters},
number = 3,
volume = 12,
place = {United Kingdom},
year = {Thu Mar 16 00:00:00 EDT 2017},
month = {Thu Mar 16 00:00:00 EDT 2017}
}
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https://doi.org/10.1088/1748-9326/aa625b
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