Multiresolution optical properties for infrared sea surface modeling

2008 ◽  
Author(s):  
Karine Caillault ◽  
Sandrine Fauqueux ◽  
Pierre Simoneau
Keyword(s):  
Optical Properties ◽  
Surface Modeling ◽  
Sea Surface

scholarly journals Reply to: "Tropical cirrus and water vapor: an effective Earth infrared iris feedback?"

2002 ◽  
Vol 2 (2) ◽  
pp. 99-101 ◽  
Author(s):  
M.-D. Chou ◽  
R. S. Lindzen ◽  
A. Y. Hou
Keyword(s):  
Boundary Layer ◽  
Optical Properties ◽  
Water Vapor ◽  
Surface Temperature ◽  
Climate Sensitivity ◽  
Physical Meaning ◽  
Radiative Forcing ◽  
Sea Surface ◽  
Boundary Layer Clouds ◽  
High Level

Abstract. In assessing the iris effect suggested by Lindzen et al. (2001), Fu et al. (2002) found that the response of high-level clouds to the sea surface temperature had an effect of reducing the climate sensitivity to external radiative forcing, but the effect was not as strong as LCH found. The approach of FBH to specifying longwave emission and cloud albedos appears to be inappropriate, and the derived cloud optical properties may not have real physical meaning. The cloud albedo calculated by FBH is too large for cirrus clouds and too small for boundary layer clouds, which underestimates the iris effect.

scholarly journals Modelling a Spectral Index to Detect Dispersed Oil in a Seawater Column Depending on the Viewing Angle: Gulf of Gdańsk Case Study

Sensors ◽  
2020 ◽  
Vol 20 (18) ◽  
pp. 5352
Author(s):  
Emilia Baszanowska ◽  
Zbigniew Otremba ◽  
Jacek Piskozub
Keyword(s):  
Optical Properties ◽  
Spectral Index ◽  
Sea Surface ◽  
Viewing Angle ◽  
Gulf Of Gdańsk ◽  
Water Emulsion ◽  
Dispersed Oil ◽  
Oil Concentration ◽  
Gulf Of Gdansk ◽  
Oil In Water Emulsion

This paper analyzes the digital modelling of radiance reflectance of the sea surface when the water column is polluted by oil-in-water emulsion. A method tracking the fate of two billion virtual solar photons was applied to obtain the angular distribution of bottom-up radiance for a plane of sunlight striking the sea surface. For the calculations, the inherent optical properties of seawater characteristic for the Gulf of Gdańsk (southern Baltic Sea) were used. The analyses were performed for two types of oils with extremely different optical properties for an oil concentration of 10 ppm and for a roughened sea surface with a wind speed of 2 m/s. The spectral index for oil detection in seawater for different viewing angles was determined based on the results obtained for reflectance at eight wavelengths in the range of 412–676 nm for viewing angle in the range from 80° to 0°, both on the side of incidence of direct sunlight and on the opposite side. The resulting calculated spectral indexes for different wavelength combinations indicated significant dependence on the viewing angle.

scholarly journals Results of the first Wave Glider experiment in the southern Tyrrhenian Sea

2016 ◽  
Vol 7 (1) ◽  
Author(s):  
Giuseppe Aulicino ◽  
Yuri Cotroneo ◽  
Teodosio Lacava ◽  
Giancanio Sileo ◽  
Giannetta Fusco ◽  
...  
Keyword(s):  
Optical Properties ◽  
Autonomous Vehicle ◽  
Sea Surface ◽  
Preliminary Evaluation ◽  
Tyrrhenian Sea ◽  
Surface Parameters ◽  
Spatial And Temporal Scales ◽  
Gulf Of Naples ◽  
Southern Tyrrhenian Sea ◽  
Wave Glider

<p>A wave-propelled autonomous vehicle (Wave Glider) instrumented with a variety of oceanographic and meteorological sensors was launched from Gulf of Naples on the 12<sup>th </sup>of September 2012 for a two-week mission in the Southern Tyrrhenian Sea. The main objective of the mission was a preliminary evaluation of the potential of commercial autonomous platforms to provide reliable measurements of sea surface parameters which can complement existing satellite based products moving from the local to the synoptic scale. To this aim Wave Glider measurements were compared to equivalent, or near-equivalent, satellite products achieved from MODIS (Moderate Resolution Imaging Spectroradiometer) sensors onboard the EOS (Earth Observing System) satellite platforms and from AVISO (Archiving Validation and Interpretation of Satellite Oceanographic Data). Level-3 near real time and Level-4 reprocessed sea surface foundation temperature products provided by the CMEMS (Copernicus Marine Environment Monitoring Service) were also included in this study as well as high resolution model output supplied by NEMO (Nucleus for European Modelling of the Ocean). The Wave Glider was equipped with sensors to measure temperature, salinity, currents, as well as Colored Dissolved Organic Matter (CDOM), turbidity and refined fuels fluorescence. The achieved results confirmed the emerging value of Wave Gliders in the framework of multiplatform monitoring systems of the ocean surface parameters. In particular, they showed that Wave Glider measurements captured the southern Tyrrhenian Sea major surface oceanographic features, including the coast to open sea haline gradient and the presence of a cyclone-anticyclone system in the southeastern sub-region. The Wave Glider also had the capability to monitor upper ocean currents at finer spatial and temporal scales than satellite altimetric observations and model outputs. Nonetheless, results stressed the existence of several limits in the combined use of satellite and Wave Glider observations and the necessity of further analyses concerning the monitoring of the ocean optical properties. In fact, Wave Glider and satellite-based products agree in terms of sea surface temperature and currents patterns, while bio-optical properties turned out to be less well correlated. No significant traces of refined fuels have been detected along the WG track.</p>

Infrared multiscale sea surface modeling

2006 ◽  
Author(s):  
Karine Caillault ◽  
Sandrine Fauqueux ◽  
Christophe Bourlier ◽  
Pierre Simoneau
Keyword(s):  
Surface Modeling ◽  
Sea Surface

Relationship between spectral reflected irradiance at the sea surface and optical properties of marine phytoplankton

1994 ◽  
Author(s):  
Bogdan Wozniak ◽  
Witold von Smekot-Wensierksi ◽  
Roland Doerffer ◽  
Hartmut Grassl
Keyword(s):  
Optical Properties ◽  
Sea Surface ◽  
Marine Phytoplankton

Three-dimensional dynamic sea surface modeling based on ocean wave spectrum

2021 ◽  
Vol 40 (10) ◽  
pp. 38-48
Author(s):  
Zhimiao Chang ◽  
Fuxing Han ◽  
Zhangqing Sun ◽  
Zhenghui Gao ◽  
Lili Wang
Keyword(s):  
Wave Spectrum ◽  
Three Dimensional ◽  
Surface Modeling ◽  
Sea Surface ◽  
Ocean Wave ◽  
Ocean Wave Spectrum

scholarly journals Reply to: “Tropical cirrus and water vapor: an effective Earth infrared iris feedback?"

2002 ◽  
Vol 2 (1) ◽  
pp. 173-180 ◽  
Author(s):  
M.-D. Chou ◽  
R. S. Lindzen ◽  
A. Y. Hou
Keyword(s):  
Boundary Layer ◽  
Optical Properties ◽  
Water Vapor ◽  
Surface Temperature ◽  
Climate Sensitivity ◽  
Physical Meaning ◽  
Radiative Forcing ◽  
Sea Surface ◽  
Boundary Layer Clouds ◽  
High Level

Abstract. In assessing the iris effect suggested by Lindzen et al. (2001), Fu et al. (2001, 2002) found that the response of high-level clouds to the sea surface temperature had an effect of reducing the climate sensitivity to external radiative forcing, but the effect was not as strong as Lindzen et al. (2001) found. The approach of Fu et al. (2001, 2002) to specifying longwave emission and cloud albedos appears to be inappropriate, and the derived cloud optical properties may not have real physical meaning. The cloud albedo calculated by Fu et al. (2001, 2002) is too large for cirrus clouds and too small for boundary layer clouds, which underestimates the iris effect.

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