Determine the absorption coefficient of visible light in the southern waters of the Caspian Sea

Subject Areas : soil pollution

Jamshid Karimi ¹ (M.Sc of Physical Oceanography, MOHAM Industrial group, Shahid Sattari Industry.)
Masoud Torabi Azad ² (Associate Prof. Islamic Azad university, North Tehran Branch)

Received: 2017-10-21 Accepted : 2017-10-21 Published : 2020-12-21

Keywords: Attenuation coefficient of vis, Scattering coefficient of visi, Absorption coefficient of visi, South Caspian Sea,

Abstract :

Visible light is a combination of different colors. Absorption and scattering of light in different environments are depending on the type of environment and the wavelength of incident light.  The sea water is one of the areas that cause severe attenuation of visible light. In this study, a method for calculating the absorption of visible light in the southern waters of the Caspian Sea in Chalus and Kapurchal station is provided. A water sample from a depth of half a meter from each station sampled laboratory irradiated laser beams with different wavelengths and the light attenuation coefficient obtained by using the relevant tables, the light absorption coefficient is calculated in study stations.  The two stations due to the low salinity of sea water is less dispersion. An also, because the surface layer of water sampling is done, the influence of visible light at different wavelengths is almost identical. Shorter wavelengths are more scattered and longer wavelengths are more absorbed.            

References:

- حسینی.ه ،1390 ، مطالعه تغییرات ضریب تضعیف نور با طول موج، توسط اندازه‌گیری‌های میدانی در سواحل خزر جنوبی (بندر نوشهر)، پایان نامه کارشناسی ارشد ، دانشگاه آزاد اسلامی- تهران شمال، دانشکده علوم وفنون دریایی.

2-Bogdan wozniak and Jerzy dera, 2007,  Light absorption in sea water , Atmospheric and oceanographic Seiences library (33) ,  Springer.      

3- Knauss .J, 1997, Introduction to physical Oceanography, Prentice Hall, Second Edition.

4-Emery.W.J and Richard E.Thomson , 2004 ,  Data Analysis Methods In Physical Oceanography , Elsevier. 

5-Kokhanovsky A.A, 2006, Light Scattering Reviews, Springer.

6-Alexander, L. V., et al., 2006, Global observed changes in daily climate extremes of temperature and precipitation, J. Geophys. Res., 111.

 7- Stewart.R.H, 2008, Introduction to physical oceanography, Department of oceanography

Texas A & M University.

8-ایزدی  .د، 1385 ، بررسی تضعیف نور در آبهای دریای عمان ، پایان نامه کارشناسی ارشد ، دانشگاه آزاد اسلامی- تهران شمال ، دانشکده علوم وفنون دریایی.                                9- Tam. A. C., C. K. N. Patel, and R. J. Kerl,1979, Measurement of small absorptions in liquids,Optics Letters,Vol. 4,Issue 3,pp. 81-83

10-Bricaud, A., M. Babin, A. Morel, and H. Claustre, 1995, Variability in the chlorophyll-specific absorption coefficients of naturnal phytoplankton: Analysis and parameterization, J. Geophy. Res., 100, 13321-13332.

11- Owen.R.W., 1973, The effect of particles on light Scattering in the sea.Springer.

12-Miroslaw Jonasz and Georges R. Fournier, 2007, Light Scattering by Particles in water, Elsevier.