Accession Number:

ADA605405

Title:

Wave Induced Bubble Clouds and their Effect on Radiance in the Upper Ocean

Descriptive Note:

Corporate Author:

RHODE ISLAND UNIV NARRAGANSETT GRADUATE SCHOOL OF OCEANOGRAPHY

Personal Author(s):

Report Date:

2007-09-30

Pagination or Media Count:

5.0

Abstract:

LONG-TERM GOALS. A goal of this project is to measure wave induced bubble clouds and their effect on radiance in the upper ocean and to address the fact that despite the fundamental importance of optical backscatter in the ocean it is still not possible to explain more than 5 to 10 percent of the particulate backscattering in the ocean based on known constituents even during periods with no active wave breaking Terrill Lewis, 2004. We want to investigate the role of upper ocean bubbles in these processes. In this work we are working closely with Svein Vagle IOS. OBJECTIVES. During this project, which is a component of the much larger RadyO project, we are addressing the following scientific questions How does radiant light fluctuate beneath a sea in which waves are breaking Can this variability be explained in terms of measured bubble populations with wave scattering models using Mei theory as a kernel for light-bubble interactions Can a predictive model be developed for radiant light that includes wave conditions and predicted subsurface bubble injections The presence of surfactants on the surface of the bubbles decreases their buoyancy and therefore their rise speed. The presence of compounds on the bubbles will also modify their dissolution rate and will therefore change the dynamics of the temporal and spatial evolution of bubble clouds and their size distributions. Bubbles are effective at scattering light thus a proper understanding of the role of surfactants on the bubble field is important to understanding observed radiance modulations. With our collaborators at IOS and the larger RadyO group of investigators, we will measure and model bubble injection and radiance fluctuations in the upper ocean during wave-breaking conditions.

Subject Categories:

  • Physical and Dynamic Oceanography
  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE