Study of coherent structures and heat flux transportation under different stratification stability conditions in the atmospheric surface layer

2021 ◽  
Vol 33 (6) ◽  
pp. 065113
Author(s):  
Xuebo Li ◽  
Guohua Wang ◽  
Xiaojing Zheng
Keyword(s):  
Heat Flux ◽  
Surface Layer ◽  
Coherent Structures ◽  
Atmospheric Surface Layer ◽  
Stability Conditions

scholarly journals Characteristics of the Heat Flux in the Unstable Atmospheric Surface Layer

2016 ◽  
Vol 73 (11) ◽  
pp. 4519-4529 ◽  
Author(s):  
Maithili Sharan ◽  
Piyush Srivastava
Keyword(s):  
Heat Flux ◽  
Surface Layer ◽  
Temperature Gradient ◽  
Power Law ◽  
Atmospheric Surface Layer ◽  
Potential Temperature ◽  
Stability Parameter ◽  
Layer Potential ◽  
Power Law Function ◽  
The Stability

Abstract The behavior of the heat flux H with respect to the stability parameter (=z/L, where z is the height above the ground, and L is the Obukhov length) in the unstable atmospheric surface layer is analyzed within the framework of Monin–Obukhov similarity (MOS) theory. Using MOS equations, H is expressed as a function of and vertical surface-layer potential temperature gradient . A mathematical analysis is carried out to analyze the theoretical nature of heat flux with the stability parameter by considering the vertical potential temperature gradient as (i) a constant and (ii) a power-law function of heat flux. For a given value of H, two values of associated with different stability regimes are found to occur in both the conditions, suggesting the nonuniqueness of MOS equations. Turbulent data over three different sites—(i) Ranchi, India; (ii) the Met Office’s Cardington, United Kingdom, monitoring facility; and (iii) 1999 Cooperative Atmosphere–Surface Exchange Study (CASES-99; United States—are analyzed to compare the observed nature of H with that predicted by MOS. The analysis of observational data over these three sites reveals that the observed variation of H with is consistent with that obtained theoretically from MOS equations when considering the vertical temperature gradient as a power-law function of heat flux having the exponent larger than 2/3. The existence of two different values of the stability parameter for a given value of heat flux suggests that the application of heat flux as a boundary condition involves some intricacies, and it should be applied with caution in convective conditions.

Long-term study of coherent structures in the atmospheric surface layer

2007 ◽  
Vol 125 (1) ◽  
pp. 1-24 ◽  
Author(s):  
Christian Barthlott ◽  
Philippe Drobinski ◽  
Clément Fesquet ◽  
Thomas Dubos ◽  
Christophe Pietras
Keyword(s):  
Surface Layer ◽  
Coherent Structures ◽  
Atmospheric Surface Layer ◽  
Term Study ◽  
Long Term Study

Ground effects on pressure fluctuations in the atmospheric boundary layer

1978 ◽  
Vol 86 (3) ◽  
pp. 491-511 ◽  
Author(s):  
M. M. Gibson ◽  
B. E. Launder
Keyword(s):  
Boundary Layer ◽  
Heat Flux ◽  
Surface Layer ◽  
Atmospheric Surface Layer ◽  
Pressure Field ◽  
Pressure Fluctuations ◽  
Gravitational Effects ◽  
Fluctuating Pressure ◽  
Stratified Shear Flow ◽  
Ground Effects

Proposals are made for modelling the pressure-containing correlations which appear in the transport equations for Reynolds stress and heat flux in a simple way which accounts for gravitational effects and the modification of the fluctuating pressure field by the presence of a wall. The predicted changes in structure are shown to agree with Young's (1975) measurements in a free stratified shear flow and with the Kansas data on the atmospheric surface layer.

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