scholarly journals EXISTENCE OF CONSTANT-FLUX LAYER ABOVE THE URBAN AREA

2002 ◽  
Vol 46 ◽  
pp. 79-84 ◽  
Author(s):  
Tomoki WATANABE ◽  
Ryo MORIWAKI ◽  
Manabu KANDA ◽  
Kazuaki MATSUNAGA
Keyword(s):  
Urban Area ◽  
Constant Flux ◽  
Flux Layer

scholarly journals Swell Modulation on Wind Stress in the Constant Flux Layer

2020 ◽  
Vol 47 (20) ◽  
Author(s):  
Sheng Chen ◽  
Fangli Qiao ◽  
Jun A. Zhang ◽  
Hongyu Ma ◽  
Yuhuan Xue ◽  
...  
Keyword(s):  
Wind Stress ◽  
Constant Flux ◽  
Flux Layer

A note on estimating the height of the constant flux layer

1981 ◽  
Vol 20 (3) ◽  
pp. 397-398 ◽  
Author(s):  
Maurice Danard
Keyword(s):  
Constant Flux ◽  
Flux Layer

scholarly journals CO<sub>2</sub>-flux measurements above the Baltic Sea at two heights: flux gradients in the surface layer?

2015 ◽  
Vol 7 (2) ◽  
pp. 311-317 ◽  
Author(s):  
A. Lammert ◽  
F. Ament
Keyword(s):  
Baltic Sea ◽  
Eddy Covariance ◽  
Latent Heat ◽  
Co2 Flux ◽  
The Baltic Sea ◽  
Near Surface ◽  
Constant Flux ◽  
Flux Measurements ◽  
Flux Layer ◽  
The Baltic

Abstract. The estimation of CO2 exchange between the ocean and the atmosphere is essential to understand the global carbon cycle. The eddy-covariance technique offers a very direct approach to observe these fluxes. The turbulent CO2 flux is measured, as well as the sensible and latent heat flux and the momentum flux, a few meters above the ocean in the atmosphere. Assuming a constant-flux layer in the near-surface part of the atmospheric boundary layer, this flux equals the exchange flux between ocean and atmosphere. The purpose of this paper is the comparison of long-term flux measurements at two different heights above the Baltic Sea to investigate this assumption. The results are based on a 1.5-year record of quality-controlled eddy-covariance measurements. Concerning the flux of momentum and of sensible and latent heat, the constant-flux layer theory can be confirmed because flux differences between the two heights are insignificantly small more than 95 % of the time. In contrast, significant differences, which are larger than the measurement error, occur in the CO2 flux about 35 % of the time. Data used for this paper are published at http://doi.pangaea.de/10.1594/PANGAEA.808714.

Wind Measurements Near the Surface of Waves

2013 ◽  
Author(s):  
Alexander V. Babanin ◽  
Jason McConochie
Keyword(s):  
Surface Wind ◽  
Constant Flux ◽  
Wind Speeds ◽  
Momentum Fluxes ◽  
Wind Measurements ◽  
The Mean ◽  
Flux Layer ◽  
Logarithmic Layer ◽  
Wave Boundary

Wind-over-wave in situ measurements are typically conducted in two different fashions: either by means of wave-riding buoys, or by placing anemometers well elevated above the surface. Routinely, concept of the constant-flux layer is invoked to convert one into another as necessary. In the paper, comparisons of mean wind speeds and wind-momentum fluxes are conducted, based on measurements throughout the wave boundary layer, including wave-follower measurements very near the surface. Significant deviations from the constant-flux expectations are found. Near the surface, the fluxes are less than those obtained by extrapolation within the logarithmic-layer assumption, and the mean wind speeds are correspondingly larger. Such results have significant implications for modelling the wind-generated waves and for calibrations of remotely sensed surface wind conditions.

scholarly journals CO<sub>2</sub>-flux measurements above the Baltic Sea at two heights: flux gradients in the surface layer

2015 ◽  
Vol 8 (2) ◽  
pp. 587-601
Author(s):  
A. Lammert ◽  
F. Ament
Keyword(s):  
Baltic Sea ◽  
Eddy Covariance ◽  
Latent Heat ◽  
Co2 Flux ◽  
The Baltic Sea ◽  
Near Surface ◽  
Constant Flux ◽  
Flux Measurements ◽  
Flux Layer ◽  
The Baltic

Abstract. The estimation of CO2 exchange between the ocean and the atmosphere is essential to understand the global carbon cycle. The eddy-covariance technique offers a very direct approach to observe these fluxes. The turbulent CO2 flux is measured as well as the sensible and latent heat flux and the momentum flux, a few meters above the ocean in the atmosphere. Assuming a constant-flux layer in the near surface part of the atmospheric boundary, this flux equals the exchange flux between ocean and atmosphere. The goal of this paper is the comparison of long-term flux measurements at two different heights above the Baltic Sea due to this assumption. The results are based on an one-and-a-half year record of quality controlled eddy covariance measurements. Concerning the flux of momentum and of sensible and latent heat, the constant-flux layer theory can be validated because flux gradients between the two heights are more than 95 % of the time insignificantly small. In contrast, significant gradients, which are larger than the measurement error, occur for the CO2 flux in nearly 35 % of the time. Data, used for this paper are published at http://doi.pangaea.de/10.1594/PANGAEA.808714.

Sign in / Sign up

Export Citation Format

Share Document