Atmospheric correction of ocean color imagery through thick layers of Saharan dust

Moulin, C.; Gordon, Howard R.; Chomko, R.; Banzon, Viva F.; Evans, Robert H.

doi:10.1029/2000gl011803

Cited by 77 publications

(51 citation statements)

References 10 publications

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“…We believe that the lidar data on the dust aerosol vertical profiles presented at 355 and 532 nm are indicative for our area and will be a very important input for regional radiative transfer models (RTM) and atmospheric chemistry transport models (ACTM) over the Eastern Mediterranean region (Diaz et al, 2000;Lelieveld et al, 2002), as well as for atmospheric correction of ocean color imagery data (Moulin et al, 2001). Our lidar ratio observations could also contribute to a better calibration over the Eastern Mediterranean region of the forthcoming two-wavelength space lidar CALIPSO mission.…”

Section: Discussionmentioning

confidence: 99%

Measurements of Saharan dust aerosols over the Eastern Mediterranean using elastic backscatter-Raman lidar, spectrophotometric and satellite observations in the frame of the EARLINET project

et al. 2005

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Abstract. We report on the vertical distributions of Saharan dust aerosols over the N.E. Mediterranean region, which were obtained during a typical dust outbreak on August 2000, by two lidar systems located in Athens and Thessaloniki, Greece, in the frame of the European EARLINET project. MODIS and ground sun spectrophotometric data, as well as air-mass backward trajectories confirmed the existence of Saharan dust in the case examined, which was also successfully forecasted by the DREAM dust model. The lidar data analysis for the period 2000-2002 made possible, for the first time, an estimation of the vertical extent of free tropospheric dust layers [mean values of the aerosol backscatter and extinction coefficients and the extinction-to-backscatter ratio (lidar ratio, LR) at 355 nm], as well as a seasonal distribution of Saharan dust outbreaks over Greece, under cloud-free conditions. A mean value of the lidar ratio at 355 nm was obtained over Athens (53±1 sr) and over Thessaloniki (44±2 sr) during the Saharan dust outbreaks. The corresponding aerosol optical thickness (AOT) at 355 nm, in the altitude range 0-5 km, was 0.69±0.12 and 0.65±0.10 for Athens and Thessaloniki, respectively (within the dust layer the AOT was 0.23 and 0.21, respectively). Air-mass back-trajectory analysis Correspondence to: A. Papayannis (apdlidar@central.ntua.gr) performed in the period 2000-2002 for all Saharan dust outbreaks over the N.E. Mediterranean indicated the main pathways followed by the dust aerosols.

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Section: Discussionmentioning

confidence: 99%

Measurements of Saharan dust aerosols over the Eastern Mediterranean using elastic backscatter-Raman lidar, spectrophotometric and satellite observations in the frame of the EARLINET project

et al. 2005

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“…The OC3M and OC2 algorithms are empirical algorithms developed for global applications and have been shown to overestimate chl-a in coastal environments, in part due to increased concentrations of other optical constituents (e.g., Muller-Karger et al, 2005). Within optically complex coastal waters such as Santa Monica Bay, CDOM, sediments, bottom reflectance (Maritorena et al, 1994;Cannizzaro and Carder, 2006), land adjacency effects (Santer and Schmechtig, 2000), and urban and absorbing aerosols (Moulin et al, 2001;Claustre et al, 2002;Ransibrahmanakul and Stumpf, 2006) can all interfere with the accurate detection of chl-a. This challenge is potentially exacerbated during the unusual conditions created by the wastewater diversion.…”

Section: Utility Of Landsat 8 Tirs and Oli For Coastal Water Quality mentioning

confidence: 99%

Application of Landsat 8 for Monitoring Impacts of Wastewater Discharge on Coastal Water Quality

et al. 2017

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“…We selected a relative humidity of 70% because the C70 model best matched the Angstrom exponents observed in the Dry Tortugas under dust-free conditions (see Table 1). In the simulations, the coastal aerosol is homogeneously mixed from 0 to 1 km, with t 550 = 0.05 and three dust models of varying absorption (BDW1, BDW2, and BDW3 from the work of Moulin et al, 2001b) homogeneously mixed between 1 and 4 km, with t 550 = 0.35. A background aerosol optical depth of 0.05 is consistent with our observations in dust-free conditions ( Figure 6) and values historically measured by AERONET in the Dry Tortugas in clear atmospheres (not shown).…”

Section: Effect Of Background Aerosolmentioning

confidence: 99%

Columnar aerosol single‐scattering albedo and phase function retrieved from sky radiance over the ocean: Measurements of Saharan dust

2003

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[1] The single-scattering albedo and phase function of African mineral dust are retrieved at 14 wavelengths across the visible spectrum from ground-based measurements of the aerosol optical thickness and the sky radiance taken in the solar principal plane. The retrieval algorithm employs the radiative transfer equation to solve by iteration for these properties that best reproduce the observed sky radiance, and is therefore independent of particle shape. The estimated error in the retrieved single-scattering albedo is less than 0.02 due to the precision of the solar-reflectance-based calibration of the radiometer. The phase function retrieved at 860 nm is robust under simulations of expected experimental errors and may be used to characterize aerosol scattering at the directly measured scattering angles (i.e., Â 155°). The phase function retrieved at 443 nm, however, is too sensitive to such errors to confidently describe the angular scattering at blue wavelengths. The single-scattering albedo displays a spectral shape expected of iron-bearing minerals but is much higher than climate models have assumed, indicating that wind-blown mineral dust cools Earth more than is generally believed. The method may be applied to any combination of airborne and ground-based measurements over the ocean and can complement more involved ground-based retrievals through its insensitivity to particle shape and ability to retrieve aerosol properties at relatively small aerosol optical depths.INDEX TERMS: 0305 Atmospheric Composition and Structure: Aerosols and particles (0345, 4801); 1640 Global Change: Remote sensing; 1694 Global Change: Instruments and techniques; 4275 Oceanography: General: Remote sensing and electromagnetic processes (0689); KEYWORDS: aerosol, mineral dust, absorption, sky radiance, scattering, optical properties Citation: Cattrall, C., K. L. Carder, and H. R. Gordon, Columnar aerosol single-scattering albedo and phase function retrieved from sky radiance over the ocean: Measurements of Saharan dust,

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Atmospheric correction of ocean color imagery through thick layers of Saharan dust

Cited by 77 publications

References 10 publications

Measurements of Saharan dust aerosols over the Eastern Mediterranean using elastic backscatter-Raman lidar, spectrophotometric and satellite observations in the frame of the EARLINET project

Measurements of Saharan dust aerosols over the Eastern Mediterranean using elastic backscatter-Raman lidar, spectrophotometric and satellite observations in the frame of the EARLINET project

Application of Landsat 8 for Monitoring Impacts of Wastewater Discharge on Coastal Water Quality

Columnar aerosol single‐scattering albedo and phase function retrieved from sky radiance over the ocean: Measurements of Saharan dust

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