Relationships between water attenuation coefficients derived from active and passive remote sensing: a case study from two coastal environments

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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“…3. 28,31,90,91 This suggests that either or both of the attenuation coefficients could be inferred with the appropriate lidar geometry.…”

Section: Optical Propertiesmentioning

confidence: 99%

Review of profiling oceanographic lidar

Churnside

2013

Opt. Eng

137

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“…The lidar measurements can often be related to parameters commonly used in ocean color retrievals. For airborne lidar, the lidar-attenuation coefficient is very close to the diffuseattenuation coefficient, K d , as long as the laser spot on the surface is large (Gordon, 1982), and this relationship has been verified (Montes et al, 2011;Lee et al, 2013). The most commonly used scattering parameter in ocean color measurements is the particulate backscattering coefficient, b bp .…”

Section: Polarization Lidarmentioning

confidence: 83%

“…It is also a very promising technique for the estimation of the sea temperature profiles using either the Raman or the Brillouin scattering (Leonard et al, 1979;Rudolf and Walther, 2014 and references within) but these studies were either theoretical development or laboratory tests. As the lidar equation (section Basics of Lidar) is a function of the scattering and absorption coefficients of the marine particles, it is therefore possible to detect the optical properties of the seawater (Churnside et al, 1998;Montes et al, 2011). More detailed examples of the use of airborne lidar in oceanic applications is shown in section Polarization Lidar.…”

Section: Introductionmentioning

confidence: 99%

Going Beyond Standard Ocean Color Observations: Lidar and Polarimetry

et al. 2019

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“…The corrected attenuation coefficient at the depth from −45 to −70 m is about 0.041 ± 0.005 m −1 , which is within the measurement uncertainty of the diffuse attenuation of clear seawater [ Churnside , ; Pelevin and Rostovtseva , ; Pope and Fry , ; Wozniak and Dera , ]. The vertical profile of the attenuation coefficient is between the diffuse attenuation coefficient and the beam attenuation coefficient, depending on the lidar spot size at the ocean surface [ Montes , ; Vasilkov et al ., ]. For the spot size of the CALIOP footprint, the lidar attenuation will be very close to the diffuse attenuation.…”

Section: Removal Of the Effect Of The Transient Responsementioning

confidence: 99%

Ocean subsurface studies with the CALIPSO spaceborne lidar

Trepte

et al. 2014

JGR Oceans

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The primary objective of the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) mission is to study the climate impact of clouds and aerosols in the atmosphere. However, recent studies have demonstrated that CALIPSO also collects information about the ocean subsurface. The objective of this study is to estimate the ocean subsurface backscatter from CALIPSO lidar measurements. The effects of the lidar receiver's transient response on the attenuated backscatter were first removed in order to obtain the correct attenuated backscatter profile. The empirical relationship between sea surface lidar backscatter and wind speed was used to estimate the theoretical ocean surface backscatter. Then the twoway atmospheric transmittance was estimated as the ratio between the corrected ocean surface backscatter and the theoretical one. The ocean subsurface backscatter was finally derived from the subsurface attenuated backscatter divided by the two-way atmospheric transmittance. Significant relationships between integrated subsurface backscatter and chlorophyll-a concentration and between integrated subsurface backscatter and particulate organic carbon were found, which indicate a potential use of CALIPSO lidar to estimate global chlorophyll-a and particulate organic carbon concentrations.

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Relationships between water attenuation coefficients derived from active and passive remote sensing: a case study from two coastal environments

Cited by 18 publications

References 28 publications

Review of profiling oceanographic lidar

Review of profiling oceanographic lidar

Going Beyond Standard Ocean Color Observations: Lidar and Polarimetry

Ocean subsurface studies with the CALIPSO spaceborne lidar

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