Dejun Dai
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View article: A laboratory study of wave steepness effects on sea spray generation
A laboratory study of wave steepness effects on sea spray generation Open
Sea spray generation is vital for air-sea interactions, however, it has been showing large differences of four orders of magnitude under the same wind speed. It is well known that wind speed can affect sea spray generation, and other physi…
View article: Observation and parameterization of turbulent Reynolds stress in the ocean surface boundary layer under swell-dominated conditions
Observation and parameterization of turbulent Reynolds stress in the ocean surface boundary layer under swell-dominated conditions Open
The turbulent Reynolds stress in the ocean surface boundary layer (OSBL) is investigated using two sets of turbulence measurements conducted on an offshore tower-based platform in the coastal region of the northern South China Sea. Observa…
View article: Estimating sea spray volume flux with a laser gauge in a self-consistent system
Estimating sea spray volume flux with a laser gauge in a self-consistent system Open
Sea spray is one of the drivers of heat, mass, and gas exchange between the ocean and the atmosphere, and its volume flux could be estimated by the record of the laser intensity. In the laboratory experiments, the relationship between sea …
View article: Quantitatively study on wave-turbulence interactions by laboratory experiments
Quantitatively study on wave-turbulence interactions by laboratory experiments Open
Ocean turbulent mixing influences the air-sea exchanges of heat, momentum and mass. The surface gravity waves play a key role in turbulence generation in the upper ocean. How wave energy is transferred to ocean turbulence through the wave-…
View article: Laboratory experimental study on wave-turbulence interactions
Laboratory experimental study on wave-turbulence interactions Open
<p>Surface gravity waves play an important role in the mixing process of upper ocean. How wave energy is transferred to ocean turbulence through the wave-turbulence interactions remains an open question. Here, laboratory experiments …
View article: Laboratory experiments on CO2 gas exchange with wave breaking
Laboratory experiments on CO2 gas exchange with wave breaking Open
The CO 2 gas transfer velocity ( ) at air-sea interface is usually parameterized with the wind speed, but to a great extent is defined by waves and wave breaking. To investigate the direct relationship between and waves, laboratory experim…
View article: Observational Evidence of Surface Wave&#8208;Generated Strong Ocean Turbulence
Observational Evidence of Surface Wave‐Generated Strong Ocean Turbulence Open
<p>By using an acoustic Doppler velocimeter mounted on the seabed of the continental shelf of the<br>northern South China Sea, high frequency velocity fluctuations were measured for 4.5 days. The<br>turbulent kinetic ener…
View article: Laboratory experiments on CO2 gas exchange with wave breaking
Laboratory experiments on CO2 gas exchange with wave breaking Open
The 2 gas transfer velocity (2 ) at air-sea interface is usually parameterized with the wind speed, but to a great extent is defined by waves and wave breaking. To investigate the direct relationship between 2 and waves, laboratory experim…
View article: Study on air-sea CO2 exchange with wave breaking
Study on air-sea CO2 exchange with wave breaking Open
<p>Hydrodynamic processes at air-sea interface play a significant role on air-sea CO<sub>2</sub> gas exchange, which further affects global carbon cycle and climate change. CO<sub>2</sub> gas transfer velocity…
View article: Impact of Surface Waves on Wind Stress under Low to Moderate Wind Conditions
Impact of Surface Waves on Wind Stress under Low to Moderate Wind Conditions Open
<p>The impact of ocean surface waves on wind stress at the air&#8211;sea interface under low to moderate wind<br>conditions was systematically investigated based on a simple constant flux model and flux measurements<br&g…
View article: Observational evidence of surface wave-generated strong ocean turbulence
Observational evidence of surface wave-generated strong ocean turbulence Open
<p>By using an Acoustic Doppler Velocimeter (ADV) mounted on the seabed of the continental shelf of the northern South China Sea, high frequency velocity fluctuations were measured for 4.5 days. The turbulent kinetic energy dissipati…
View article: Observational Evidence of Surface Wave‐Generated Strong Ocean Turbulence
Observational Evidence of Surface Wave‐Generated Strong Ocean Turbulence Open
By using an acoustic Doppler velocimeter mounted on the seabed of the continental shelf of the northern South China Sea, high frequency velocity fluctuations were measured for 4.5 days. The turbulent kinetic energy dissipation rate was est…
View article: Novel Generalized Three-Step Phase-Shifting Interferometry with a Slight-Tilt Reference
Novel Generalized Three-Step Phase-Shifting Interferometry with a Slight-Tilt Reference Open
A convenient and powerful method is proposed and presented to find the unknown phase shifts in three-step generalized phase-shifting interferometry. A slight-tilt reference of 0.1 degrees is employed. As a result, the developed theory show…
View article: Calculation of turbulent dissipation rate with acoustic Doppler velocimeter
Calculation of turbulent dissipation rate with acoustic Doppler velocimeter Open
Turbulent dissipation rates are calculated from an acoustic Doppler velocimeter by fitting the measured wavenumber spectrum to a universal turbulence spectrum. A combination of the Butterworth filter and empirical model decomposition is em…
View article: Source site of internal solitary waves in the northern South China of westward shoaling thermocline
Source site of internal solitary waves in the northern South China of westward shoaling thermocline Open
This study use a three dimensional general circulation model, MITgcm with non-hydrostatic option, to study the source site of internal solitary waves (ISWs) observed in the northern South China Sea. Simulation reveals that besides Luzon St…
View article: Wave–turbulence interaction-induced vertical mixing and its effects in ocean and climate models
Wave–turbulence interaction-induced vertical mixing and its effects in ocean and climate models Open
Heated from above, the oceans are stably stratified. Therefore, the performance of general ocean circulation models and climate studies through coupled atmosphere–ocean models depends critically on vertical mixing of energy and momentum in…