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

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:
 [1] ;  [1] ;  [2] ;  [3]
  1. Washington State Univ., Pullman, WA (United States)
  2. Duke Univ., Durham, NC (United States)
  3. Univ. of Bayreuth, Bavaria (Germany)
Publication Date:
Grant/Contract Number:
SC0006967; SC0011461
Type:
Published Article
Journal Name:
Environmental Research Letters
Additional Journal Information:
Journal Volume: 12; Journal Issue: 3; Journal ID: ISSN 1748-9326
Publisher:
IOP Publishing
Research Org:
Washington State Univ., Pullman, WA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; biochemical research methods; mathematical & computational biology; eddy covariance fluxes; large eddies; ensemble empirical mode decomposition; horizontal advection
OSTI Identifier:
1347044
Alternate Identifier(s):
OSTI ID: 1355930