Pecularities of the light attenuation coefficient spectra measured in the upper layer of the Black Sea in 103rd cruise of the R/V Professor Vodyanitsky

2019 ◽  
Author(s):  
Vyacheslav V. Suslin ◽  
Alexandr A. Latushkin ◽  
Oleg B. Kudinov ◽  
Oleg V. Martynov
Keyword(s):  
Attenuation Coefficient ◽  
Black Sea ◽  
Light Attenuation ◽  
The Black Sea ◽  
Light Attenuation Coefficient

scholarly journals Light attenuation coefficient of polarization attenuator at high attenuation level

2010 ◽  
Vol 59 (3) ◽  
pp. 1756
Author(s):  
Huang Chong ◽  
Chen Hai-Qing ◽  
Liao Zhao-Shu ◽  
Zhao Shuang
Keyword(s):  
Attenuation Coefficient ◽  
Light Attenuation ◽  
High Attenuation ◽  
Light Attenuation Coefficient ◽  
Attenuation Level

scholarly journals Analytical solution of nitracline with the evolution of subsurface chlorophyll maximum in stratified water columns

2016 ◽  
Author(s):  
Xiang Gong ◽  
Wensheng Jiang ◽  
Linhui Wang ◽  
Huiwang Gao ◽  
Emmanuel Boss ◽  
...  
Keyword(s):  
Light Intensity ◽  
Analytical Solution ◽  
Primary Production ◽  
Attenuation Coefficient ◽  
Light Attenuation ◽  
Euphotic Zone ◽  
Light Level ◽  
Chlorophyll Maximum ◽  
Subsurface Chlorophyll Maximum ◽  
Light Attenuation Coefficient

Abstract. In a stratified water column, the nitracline is a layer where the nitrate concentration increases below the nutrient-depleted upper layer, exhibiting a strong vertical gradient in the euphotic zone. The subsurface chlorophyll maximum layer (SCML) forms near the bottom of euphotic zone, acting as a trap to diminish the upward nutrient supply. Depth and steepness of the nitracline are important measurable parameters related to the vertical transport of nitrate into the euphotic zone. The correlation between the SCML and the nitracline has been widely reported in the literature, but the analytic solution for the relationship between them is not well established. By incorporating a piecewise function for the approximate Gaussian vertical profile of chlorophyll, we derive analytical solutions for the system of phytoplankton and nutrient. The analytical solution shows that the nitracline depth is deeper than the depth of SCML, shoaling with an increase in light attenuation coefficient and with a decrease in surface light intensity. The inverse proportional relationship between the light level at the nitracline depth and the maximum rate of new primary production is derived, suggesting that the light level at the nitracline can be used as an indicator for integrated new primary production. Analytic solutions also show that a thinner SCML corresponds to a steeper nitracline. The nitracline steepness is positively related to light attenuation coefficient, but independent of surface light intensity. The derived equations of the nitracline in relation to the SCML provide further insight into the important role of the nitracline in marine pelagic ecosystems.

LIGHT ATTENUATION COEFFICIENT AND PRODUCTIVITY IN ’VERNAL’ ALFALFA

1970 ◽  
Vol 50 (4) ◽  
pp. 469-474 ◽  
Author(s):  
L. A. HUNT ◽  
J. E. WINCH ◽  
C. E. MOORE
Keyword(s):  
Medicago Sativa ◽  
Attenuation Coefficient ◽  
Dry Matter ◽  
Light Attenuation ◽  
Growing Season ◽  
Dry Matter Accumulation ◽  
Light Attenuation Coefficient ◽  
Below Ground ◽  
Medicago Sativa L

A field stand of ’Vernal’ alfalfa (Medicago sativa L.), cut three times during the growing season, was studied over two years. The attenuation coefficient for radiation of wavelength 300 nm to 400 nm, and the rate of dry matter accumulation, was greater in first growth than in both second and third growth. Percentage dry matter increment below ground was least during first growth.

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