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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

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 twelve 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 non-precipitating days. A single-column model test shows that model simulated boundary layer development is impacted by using the large-scale forcing data of differentmore » surface turbulent fluxes. Determinately, 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.« less
Authors:
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 Lab. (LLNL), Livermore, CA (United States)
  2. Stony Brook Univ., Stony Brook, NY (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Grant/Contract Number:
AC02-06CH11357; DE‐AC02‐06CH11357; DE‐AC52‐07NA27344
Type:
Published Article
Journal Name:
Journal of Geophysical Research: Atmospheres
Additional Journal Information:
Journal Volume: 124; Journal Issue: 4; Journal ID: ISSN 2169-897X
Publisher:
American Geophysical Union
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23), Atmospheric Radiation Measurement (ARM); USDOE
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; eddy correlation; land‐atmosphere interaction; large‐scale forcing; surface energy balance; surface vegetation type
OSTI Identifier:
1507205
Alternate Identifier(s):
OSTI ID: 1501873; OSTI ID: 1507206

Tang, Shuaiqi, Xie, Shaocheng, Zhang, Minghua, Tang, Qi, Zhang, Yunyan, Klein, Stephen A., Cook, David R., and Sullivan, Ryan C.. 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. United States: N. p., Web. doi:10.1029/2018JD029689.
Tang, Shuaiqi, Xie, Shaocheng, Zhang, Minghua, Tang, Qi, Zhang, Yunyan, Klein, Stephen A., Cook, David R., & Sullivan, Ryan C.. 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. United States. doi:10.1029/2018JD029689.
Tang, Shuaiqi, Xie, Shaocheng, Zhang, Minghua, Tang, Qi, Zhang, Yunyan, Klein, Stephen A., Cook, David R., and Sullivan, Ryan C.. 2019. "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". United States. doi:10.1029/2018JD029689.
@article{osti_1507205,
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},
author = {Tang, Shuaiqi and Xie, Shaocheng and Zhang, Minghua and Tang, Qi and Zhang, Yunyan and Klein, Stephen A. and Cook, David R. and Sullivan, Ryan C.},
abstractNote = {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 twelve 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 non-precipitating 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. Determinately, 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.},
doi = {10.1029/2018JD029689},
journal = {Journal of Geophysical Research: Atmospheres},
number = 4,
volume = 124,
place = {United States},
year = {2019},
month = {2}
}

Works referenced in this record:

Correction of flux measurements for density effects due to heat and water vapour transfer
journal, January 1980
  • Webb, E. K.; Pearman, G. I.; Leuning, R.
  • Quarterly Journal of the Royal Meteorological Society, Vol. 106, Issue 447, p. 85-100
  • DOI: 10.1002/qj.49710644707