Raman LIDAR For The Remote Measurement Of Subsurface Ocean Parameters

Leonard, Donald A.; Caputo, Bernard

doi:10.1117/12.943313

Cited by 5 publications

(2 citation statements)

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“…Because the Raman-shifted light is strongly absorbed when 532-nm illumination is used, measurements have used shorter-wavelength lasers [123][124][125][126] unless only near-surface values are required. 127,128 Using this technique, temperature profiles have been measured to 30 m using a 450-nm laser on a ship.…”

Section: Temperaturementioning

confidence: 99%

Review of profiling oceanographic lidar

Churnside

2013

Opt. Eng

145

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This paper provides a review of the development of profiling oceanographic lidars. These can provide quantitative profiles of the optical properties of the water column to depths of 20 to 30 m in productive coastal waters and to depths of 100 m for a blue lidar in the open ocean. The properties that can be measured include beam attenuation, diffuse attenuation, absorption, volume scattering at the scattering angle of 180 deg, and total backscattering. Lidar can be used to infer the relative vertical distributions of fish, plankton, bubbles, and other scattering particles. Using scattering as a tracer, lidar can provide information on the dynamics of the upper ocean, including mixed-layer depth, internal waves, and turbulence. Information in the polarization of the lidar return has been critical to the success of many of these investigations. Future progress in the field is likely through a better understanding of the variability of the lidar ratio and the application of high-spectral-resolution lidar to the ocean. Somewhat farther into the future, capabilities are likely to include lidar profiling of temperature in the ocean and an oceanographic lidar in space.

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Section: Temperaturementioning

confidence: 99%

Review of profiling oceanographic lidar

Churnside

2013

Opt. Eng

145

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“…Temperature profiles are more difficult to measure from an aircraft. It is possible to measure temperature profiles using either Brillouin [20,21] or Raman [22,23] lidar, but neither technique has been widely applied. Sea surface temperature can easily be measured from an aircraft using a thermal radiometer, and this temperature can be used through the mixed layer of the upper ocean.…”

Section: Profiles Of Productivitymentioning

confidence: 99%

Airborne lidar estimates of photosynthesis profiles

Churnside

2016

2016 IEEE International Geoscience and Remote Sensing Symposium (IGARSS)

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The rate of photosynthesis in the ocean depends on the concentration of chlorophyll in the water, the light level, and the water temperature. The depth profile of chlorophyll concentration can be estimated by airborne backscatter lidar. Both the attenuation of a lidar pulse and the volume backscattering coefficient depend on chlorophyll concentration, and these dependences can be used in an iterative retrieval to estimate the chlorophyll profile. The chlorophyll concentration profile can also be used to estimate the attenuation of sunlight with depth, which can be used with a measurement of the incident sunlight at the aircraft to estimate the light level profile. The temperature profile is more difficult, but the sea-surface temperature can be measured from the aircraft and this temperature is constant through the mixed layer. The technique is illustrated using data from a lidar and visible and infrared radiometers on an aircraft over the Gulf of Mexico.

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