Effects of ultraviolet radiation on the persistence of ocean surface slick microlayer pressure

Richard A. Skop; Ruo-Shan Tseng; John W. Brown

doi:10.1117/12.138860

22 December 1992 Effects of ultraviolet radiation on the persistence of ocean surface slick microlayer pressure

Richard A. Skop, Ruo-Shan Tseng, John W. Brown

Proceedings Volume 1749, Optics of the Air-Sea Interface: Theory and Measurement; (1992) https://doi.org/10.1117/12.138860
Event: San Diego '92, 1992, San Diego, CA, United States

Abstract

Coastal seawater was collected on incoming high tides at the Rosenstiel School of Marine & Atmospheric Science. 3.51 of water was transferred to a plexiglass bubble-tank and aerated for 30 sec at a flow rate of 4.0 ml/min per cm² of water surface area (158 cm²) using glass frits producing bubbles of 203 +/- 61 micrometers diameter. The surface pressure was then determined using calibrated spreading oils of known spreading pressure. After cleaning the seawater surface thoroughly, the water was re-aerated and allowed to stand for 1 to 3 hours in the absence and presence of longwave (365 nm) or shortwave (254 nm) ultraviolet (UV) light, both having an intensity of approximately 300 +/- 25 (mu) W/cm². In the absence of UV radiation, the surface pressure fell to approximately 64% of its initial value after 1 hour of standing and to approximately 63% of its initial value after 3 hours. Comparable results were obtained in the presence of longwave UV exposure. Under shortwave UV radiation, the decline in surface pressure was substantially accelerated; becoming 55% of the initial value after 1 hour and 35% of the initial value after 3 hours.

Citation Download Citation

Richard A. Skop, Ruo-Shan Tseng, and John W. Brown "Effects of ultraviolet radiation on the persistence of ocean surface slick microlayer pressure", Proc. SPIE 1749, Optics of the Air-Sea Interface: Theory and Measurement, (22 December 1992); https://doi.org/10.1117/12.138860

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