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Title: Differences in Eddy‐Correlation and Energy‐Balance Surface Turbulent Heat Flux Measurements and Their Impacts on the Large‐Scale Forcing Fields at the ARM SGP Site

Journal Article · · Journal of Geophysical Research: Atmospheres
DOI:https://doi.org/10.1029/2018JD029689· OSTI ID:1507205
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [3]; ORCiD logo [3]
  1. Lawrence Livermore National Laboratory Livermore CA USA
  2. School of Marine and Atmospheric SciencesStony Brook University Stony Brook NY USA
  3. Argonne National Laboratory Argonne IL USA
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Differences in the surface turbulent heat fluxes measured by the eddy correlation flux measurement system (ECOR) and the energy balance Bowen ratio system (EBBR) are examined using 12 years of continuous measurements collected at multiple stations in the Atmospheric Radiation Measurement (ARM) program Southern Great Plains (SGP) surface observational network. The flux measurements are found strongly impacted by their upwind surface types, which vary with wind direction. For collocated ECOR and EBBR at the central facility, the fluxes measured by ECOR and EBBR agree much better when their upwind fetches are over the same surface type. Among all stations at SGP, ECOR measures more over winter wheat fields while EBBR measures mostly over grassland. The different seasonality of growth cycles between winter wheat and grass causes systematic differences in measured fluxes between ECOR and EBBR. These differences impact the derived large-scale forcing as illustrated in a constrained variational analysis, in which the state variables have to be adjusted according to different fluxes to keep the column-integrated energy and moisture budgets in balance. This impact prevails in summertime on nonprecipitating days. A single-column model test shows that model-simulated boundary layer development is impacted by using the large-scale forcing data of different surface turbulent fluxes. It is recommended to include both ECOR and EBBR measurements to better represent the domain-mean turbulent fluxes and atmospheric budgets of energy and water vapor at the SGP.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23), Atmospheric Radiation Measurement (ARM); USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23). Atmospheric Radiation Measurement (ARM) Program; National Science Foundation (NSF)
Grant/Contract Number:
AC02‐06CH11357; AC52‐07NA27344; AC02-06CH11357; AC52-07NA27344
OSTI ID:
1507205
Alternate ID(s):
OSTI ID: 1501873; OSTI ID: 1507206; OSTI ID: 1510046; OSTI ID: 1513156
Report Number(s):
LLNL-JRNL-758453
Journal Information:
Journal of Geophysical Research: Atmospheres, Journal Name: Journal of Geophysical Research: Atmospheres Vol. 124 Journal Issue: 6; ISSN 2169-897X
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 20 works
Citation information provided by
Web of Science

References (33)

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Related Subjects

54 ENVIRONMENTAL SCIENCES
eddy correlation
land‐atmosphere interaction
large‐scale forcing
surface energy balance
surface vegetation type