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Large Eddies Regulate Turbulent Flux Gradients in Coupled Stable Boundary Layers

Journal Article · · Geophysical Research Letters
DOI:https://doi.org/10.1029/2019gl082228· OSTI ID:1611628
 [1];  [2];  [3];  [4];  [5]
  1. Washington State Univ., Pullman, WA (United States); DOE/OSTI
  2. Washington State Univ., Pullman, WA (United States)
  3. Duke Univ., Durham, NC (United States)
  4. Boston Univ., MA (United States)
  5. National Oceanic and Atmospheric Administration (NOAA), Idaho Falls, ID (United States)
Due to strong mean wind shear, the stable boundary layer (SBL) becomes vertically coupled. In a coupled SBL, large turbulent eddies enhance cross-layer mixing and vertically mix turbulent kinetic energy. However, large gradients in momentum and heat fluxes are frequently observed, degrading the performance of Monin-Obukhov similarity theory. It is shown that increased vertical gradients of mean variables (i.e., wind speed and potential temperature) can cause flux gradients. This process is operated upon by downward penetrating large eddies with altered phase difference, contributing unevenly to fluxes and thus causing flux gradients. In the coupled SBL with small gradients in mean variables, large eddies are vertically synchronized, contributing evenly to fluxes across layers and thus causing small flux gradients. As turbulent production becomes weak and the cross-layer difference in turbulent flux transport increases, large eddies become less vertically synchronized, contributing unevenly to fluxes across layers and thus causing large flux gradients.
Research Organization:
Duke Univ., Durham, NC (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0011461
OSTI ID:
1611628
Alternate ID(s):
OSTI ID: 1524456
Journal Information:
Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 11 Vol. 46; ISSN 0094-8276
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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