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Thursday, July 16, 2020 | History

3 edition of Inherent and apparent optical properties of the North Sea found in the catalog.

Inherent and apparent optical properties of the North Sea

Niels K. HГёjerslev

Inherent and apparent optical properties of the North Sea

Fladen ground experiment, flex 75

by Niels K. HГёjerslev

  • 46 Want to read
  • 10 Currently reading

Published by Københavns universitet, Institut for fysisk oceanografi in Copenhagen .
Written in English

    Subjects:
  • Optical oceanography -- North Sea.,
  • North Sea.

  • Edition Notes

    Other titlesFladen ground experiment, flex 75.
    Statementby N.K. Højerslev.
    SeriesReport -- no. 32., Report (Københavns universitet. Institut for fysisk oceanografi) -- no. 32.
    ContributionsKøbenhavns universitet. Institut for fysisk oceanografi.
    The Physical Object
    Pagination39, 57 p. :
    Number of Pages57
    ID Numbers
    Open LibraryOL15161041M

    Sea surface effects Optical Eyeball Response Properties of the Sea The primary source of variability in the Secchi disk depth is the optical properties of the sea, specifically the attenuation of light. (the other parameters are in the logarithmic term). Secchi disk optics: But, to what wavelengths of cand K is the secchi sensitive to? A spectral model is developed describing the relation between optical spectral reflectance and sampled suspended particulate matter concentration. This reflectance model is based on inherent optical properties of North Sea colouring water constituents. Hyper spectral airborne observations by a CASI scanner are carried out in the Dutch coastal zone and interpreted making use of the reflectance.

    Inherent and apparent optical properties of the North Sea, “Fladen Ground Experiment - FLEX 75”, Rep. Inst. Phys. Oceanogr., University of Copenhagen. Google Scholar. The MArine RAdiometric Spectrometer (MARAS) has been developed to perform in situ spectral marine radiometry. The vector and scalar components of the upwelling and downwelling light field are measured simultaneously over a constant separation, enabling the estimation of the apparent and inherent optical properties of a water body. When combined with the active MARAS sub-system, the.

    These ‘apparent’ optical properties are related to the ‘inherent’ optical properties of absorption and scatter-ing. (The inherent optical properties do not change with variations in light conditions.) The absorption coefficient, a(k), and scattering coefficient, b(k), were found from the following empirical relationships: Rð0 ;kÞ¼ ab.   Attenuation coefficients calculated in this way exhibit some interesting relationships both to certain other properties of the light field and to the inherent optical properties of the water. In particular, I find that for all types of irradiance [equation ], where E (0) is the value of irradiance just below the water surface.


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Inherent and apparent optical properties of the North Sea by Niels K. HГёjerslev Download PDF EPUB FB2

This led to the use of apparent optical properties (AOPs) rather than IOPs to describe the bulk optical properties of water bodies. A ”good” AOP will give useful information about a water body, e.g., the types and concentrations of the water constituents, from easily made measurements of the light field.

Keywords: Inherent optical properties, near infrared absorption, chlorophyll a retrieval, remote sensing algorithms. INTRODUCTION The Southern Bight of the North Sea is a shallow sea region (depths up to 40 m) with strong semi-diurnal tidal currents and wind.

The work presented in this paper seeks to build on our previous knowledge of the Clyde Sea by providing in situ measurements of a range of inherent optical properties (IOPs) and apparent optical properties (AOPs) and by investigating the relationships between by: Inherent and apparent optical properties in coastal waters: a study of the Clyde Sea in early summer D.

McKeea,*, A. Cunninghama, J. Slatera, K.J. Jonesb, C.R. Griffithsb aDepartment of Physics and Applied Physics, University of Strathclyde, Rottenrow East, Glasgow G4 0NG, Scotland, UK.

We investigated the relationships between inherent and apparent optical properties (IOP and AOP, respectively) and suspended sediment concentrations (SSC) in the main Amazonian river waters. In situ measurements of SSC, remote sensing reflectance (Rrs), the diffuse light attenuation coefficient (Kd) and the total and non-algal particle (NAP) absorption coefficients (aTOT and aNAP, respectively.

Apparent Optical Properties Diffuse attenuation, K (m-1): Note that c and K are very different because K depends Upon the properties of the solar source θ Δz K d1 K d2 Uniform c z K describes the loss of E from z to z+Δz Kd2 > Kd1 z+Δz d d, but the pathlength traveled is r =Δz/cos θ K d2 > K d1 K d.

Inherent and apparent optical properties (IOPs and AOPs) of Tampa Bay (Florida, USA) were measured during fourteen cruises between February and October to understand how these properties relate to one another and what controls light absorption and diffuse attenuation in this moderately sized (∼ km 2), shallow estuary (average depth ∼4 m).

In this study, we investigate the effects of a Phaeocystis pouchetii (hereafter Phaeocystis) bloom on inherent optical properties (IOPs) of waters underneath a compact sea‐ice pack.

The bloom was observed in May–June at 80–81°N in the Eurasian Basin of the Arctic Ocean, during the N‐ICE expedition [ Granskog et al., ]. The optical properties of sea water are sometimes grouped into inherent and apparent properties.

• Inherent optical properties (IOPs) are those properties that depend only upon the medium and therefore are independent of the ambient light field.

The two fundamental IOPs are the absorption coefficient and the volume scattering function. Simultaneously, the apparent optical property (AOP) water-leaving radiance reflectance has been measured with a system of TriOS spectroradiometers.

In this paper, we show some examples of the high variability of IOPs in the area and how it impacts the water-leaving reflectance, and hence retrieval of products such as CHL and TSM.

These algorithms derive apparent and inherent optical properties from spectral radiance measurements of the Moderate Resolution Imaging Spectrometer MERIS Cal/Val field campaigns in North Sea. inherent and apparent. Inherent optical properties (IOPs) are those properties that depend only upon the medium and therefore are independent of the ambient light field within the D t, 10 2 3 to 10 3 s (depending on whether or not one wishes to average out sea surface wave ef fects), D A, 10 2 3 m 2 D Ω, 10 2 2 sr, and D l, 10 nm.

The complex optical properties of NE Aegean Sea particles were studied in the framework of Perseus and AegeanMarTech projects. Inherent optical properties (IOPs; beam attenuation, optical.

The peculiar bio‐optical properties of the northernmost waters of the Baltic Sea (Bothnian Sea and Bothnian Bay) are illustrated by exploiting unique in situ measurements of apparent and inherent optical properties collected in   Specific inherent optical properties (SIOP) of the Berau coastal waters were derived from in situ measurements and inversion of an ocean color model.

Field measurements of water-leaving reflectance, total suspended matter (TSM), and chlorophyll a (Chl a) concentrations were carried out during the dry season.

The highest values for SIOP were found in the turbid waters, decreasing. Some examples from the North Sea data set obtained in July are described next.

Optical properties of the North Sea During July (7/7//7/94) the MARAS system was taken on a cruise aboard the RV Gauss, out of Hamburg. The cruise took place in the Sea taking in both case I and case II waters.

divided into two mutually exclusive classes: inherent and apparent. Inherent optical properties (IOP's) are those properties that depend only upon the medium, and therefore are independent of the ambient light field within the medium.

The two fundamental IOP's are the absorption coefficient and the volume scattering function. This algorithm returns spectral marine absorption and backscattering coefficients for water column constituents (e.g., colored dissolved organic material (CDOM) and algal and non-algal particles) in m-1, calculated using the default global configuration of the Generalized Inherent Optical Property.

Until now, no satellite methods were available for the study of inherent optical properties (IOPs) over wide areas of the world's oceans. Herein the coefficients of phytoplankton absorption, chromophoric dissolved organic matter (CDOM)‐detritus absorption, and total backscattering have been retrieved from Sea‐viewing Wide Field‐of‐view Sensor (SeaWiFS), and nm.

Wang and T. Li, “Spring Empirical Models between Apparent and Inherent Optical Properties in the East China Sea and Yellow Sea,” Ocean Technol. 4, (). Song and J. Tang, “The study on the scattering properties in the Huanghai Sea and East China Sea,” Acta Oceanol.

Herlevi, A. Inherent and apparent optical properties in relation to water quality in Nordic waters. Academic dissertation in Geophysics. University of Helsinki. Heron, M. L. & Prytz, A. Coherence scales for microwave Bragg scatter. In OCEANS ' MTS/IEEE. Prospects for .The MArine RAdiometric Spectrometer (MARAS) has been developed to perform in situ spectral marine radiometry.

The vector and scalar components of the upwelling and downwelling light field are measured simultaneously over a constant separation, enabling the estimation of the apparent and inherent optical properties of a water body.(). Dependence of relationship between inherent and apparent optical properties of water on solar altitude.

(). Deriving inherent optical properties and associated inversion-uncertainties in the Dutch lakes. (). Detection of optical water quality parameters for eutrophic waters by high resolution remote sensing.

().