Parameterization of the sea spray generation function with whitecap coverage

Abstract. This paper presents a sea spray generation function for aerosols produced by bubbles bursting that accounts for the effects of fetch. This is achieved by introducing a fetch-dependent model for the whitecap fraction, which is valid for fetch-limited conditions, i.e. steady-state conditions of the wave field in the whitecap droplet flux derived by Monahan et al. (1986). The aerosol generation fluxes calculated by this method show an enhancement of the aerosol production with increasing fetch. However, the predicted generation fluxes are lower than those calculated by using the classical model for the whitecap fraction proposed by Monahan and O’Muircheartaigh (1980). The results are then compared to aerosol size distributions measured in a Mediterranean coastal site at various fetch lengths. The data confirm the role of fetch, through its influence on marine aerosol generation and subsequent particle dispersion. The aerosol size distributions are divided into "fine" and "coarse" fractions. Submicrometer particles decrease in concentration at larger fetch, while the concentrations of super micron aerosols increase with increasing fetch.Key words. Atmospheric composition and structure (aerosols and particles) Meteorology and atmospheric dynamics (waves and ties) Oceanography: physical (air-sea interactions)

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ANALYSIS OF A SEA SPRAY: EFFECT OF SIMULTANEOUS GROWTH AND FRAGMENTATION ON DROPLET/PARTICLE SIZE DISTRIBUTION OF A MULTICOMPONENT AEROSOL

Atomization and Sprays ◽

10.1615/atomizspr.v11.i6.30 ◽

2001 ◽

Vol 11 (6) ◽

pp. 20 ◽

Cited By ~ 1

Author(s):

David Katoshevski

Keyword(s):

Particle Size ◽

Particle Size Distribution ◽

Size Distribution ◽

Sea Spray ◽

Simultaneous Growth

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Bulk Contributions Modulate the Sum-Frequency Generation Spectra of Interfacial Water on Model Sea-Spray Aerosols

10.26434/chemrxiv.5743638 ◽

2018 ◽

Author(s):

Sandeep K. Reddy ◽

Raphael Thiraux ◽

Bethany A. Wellen Rudd ◽

Lu Lin ◽

Tehseen Adel ◽

...

Keyword(s):

Single Layer ◽

Sum Frequency Generation ◽

Second Order ◽

Interfacial Structure ◽

Sea Spray ◽

Third Order ◽

Systematic Analysis ◽

Sum Frequency ◽

Structure Of Water ◽

Frequency Generation

Vibrational sum-frequency generation (vSFG) spectroscopy is used to determine the molecular structure of water at the interface of palmitic acid monolayers. Both measured and calculated spectra display speci c features due to third-order contributions to the vSFG response which are associated with nite interfacial electric potentials. We demonstrate that theoretical modeling enables to separate the third-order contributions, thus allowing for a systematic analysis of the strictly surface-sensitive, second-order component of the vSFG response. This study provides fundamental, molecular-level insights into the interfacial structure of water in a neutral surfactant system with relevance to single layer bio-membranes and environmentally relevant sea-spray aerosols. These results emphasize the key role that computer simulations can play in interpreting vSFG spectra and revealing microscopic details of water at complex interfaces, which can be difficult to extract from experiments due to the mixing of second-order, surface-sensitive and third-order, bulk-dependent contributions to the vSFG response.

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