Light absorption coefficients by phytoplankton pigments, suspended particles, and colored dissolved organic matter in the Crimea coastal water (the Black sea) in June 2016

2017 ◽  
Author(s):  
Nataliia Moiseeva ◽  
Tanya Churilova ◽  
Tatiana Efimova ◽  
Alexandr Latushkin ◽  
Olga Krivenko
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Black Sea ◽  
Coastal Water ◽  
Light Absorption ◽  
The Black Sea ◽  
Colored Dissolved Organic Matter ◽  
Absorption Coefficients ◽  
Phytoplankton Pigments ◽  
The Crimea

scholarly journals Dependence of the Photosynthesis Quantum Yield on Phytoplankton Light Absorption: Equations for Assessing Primary Production in the Black Sea

2021 ◽  
Vol 37 (1) ◽  
Author(s):  
T. Ya. Churilova ◽  
V. V. Suslin ◽  
H. M. Sosik ◽  
◽  
◽  
...  
Keyword(s):  
Quantum Yield ◽  
Primary Production ◽  
Black Sea ◽  
Light Absorption ◽  
Euphotic Zone ◽  
The Black Sea ◽  
Absorption Coefficients ◽  
Phytoplankton Pigments ◽  
Downwelling Irradiance

Purpose. Based on the results of the investigations that were performed during the scientific cruise and included the water hydrophysical characteristics, the chlorophyll a concentration, the photosynthesis-light dependences, the spectral light absorption coefficients by phytoplankton, and the spectral quantum downwelling irradiance, the dependence of the photosynthesis quantum yield upon the environmental factors was studied with the purpose of adaptation of the developed for the Baltic Sea approach for assessing the photosynthesis quantum yield, to the Black Sea. Methods and Results. Complex hydrophysical and biological studies were carried out at several depths within the photosynthesis zone. Spectral bio-optical parameters were measured in accordance with the modern NASA protocol (2018). The experiments on studying the photosynthesis-light relationship were performed under the temperature and light conditions close to the in situ ones. The quantum yield of photosynthesis was calculated based on the parameters of photosynthesis-light dependences (photosynthesis efficiency, light saturation parameter) and the spectral light absorption coefficients by phytoplankton pigments. It was found out that the main photosynthetic characteristics of phytoplankton including the photosynthesis maximum quantum yield and the portion of photoprotective accessory pigments in the total light absorption by phytoplankton varied with depth within the euphotic zone due to phytoplankton adaptation to the environment factors during the period of water seasonal stratification. The relationship between the photosynthesis quantum yield and the number of solar energy quanta absorbed by the photosynthetically active phytoplankton pigments was revealed. The results of the performed research allowed for modifying the equation for calculating the quantum yield for the Black Sea environment conditions according to the approach developed for the other water areas. Conclusions. For the first time, comprehensive studies carried out in the Black Sea and including the measurements of the photosynthesis-light dependences, the spectral light absorption coefficients by phytoplankton and spectral downwelling irradiance at particular optical depths within the euphotic zone enabled to reveal the equation for calculating the photosynthesis quantum yield, which could be applied for calculating primary production of the Black Sea using the spectral approach based both on the results of in situ measurements and the remote sensing data.

scholarly journals Dependence of the Photosynthetic Quantum Yield on Phytoplankton Light Absorption: Equations for Assessing Primary Production in the Black Sea

2021 ◽  
Vol 28 (1) ◽  
Author(s):  
T. Ya. Churilova ◽  
V. V. Suslin ◽  
H. M. Sosik ◽  
◽  
◽  
...  
Keyword(s):  
Quantum Yield ◽  
Black Sea ◽  
Light Absorption ◽  
Euphotic Zone ◽  
The Black Sea ◽  
Absorption Coefficients ◽  
Phytoplankton Pigments ◽  
Photosynthetic Quantum Yield ◽  
Downwelling Irradiance

Purpose. Investigations were performed during a scientific cruise to characterize hydrophysical properties, chlorophyll a concentration, photosynthesis-irradiance curves, spectral light absorption coefficients by phytoplankton, and spectral quantum downwelling irradiance. From these results, the dependence of the photosynthetic quantum yield upon environmental factors was studied with the purpose of adapting an algorithm developed for the Baltic Sea so that it can be applied for the Black Sea. Methods and Results. Complex hydrophysical and biological studies were carried out at several depths within the euphotic zone. Spectral bio-optical parameters were measured in accordance with the latest NASA protocols (2018). Experiments to determine the photosynthesis-light relationship were performed under temperature and light conditions similar to those in situ. The quantum yield of photosynthesis was calculated from parameters of photosynthesis-light curves (photosynthesis efficiency, light saturation parameter) and the spectral light absorption coefficients by phytoplankton pigments. It was found out that the main photosynthetic characteristics of phytoplankton, including the maximum photosynthetic quantum yield and the fraction of phytoplankton absorption associated with photoprotective accessory pigments, varied with depth within the euphotic zone, due to phytoplankton acclimation to environment factors during the period of seasonal stratification. The relationship between the photosynthetic quantum yield and the quanta absorbed by photosynthetically active phytoplankton pigments was revealed. The results of this research made it possible to build on the approach developed for other regions and modify the equation for calculating the quantum yield to apply specifically for environmental conditions in the Black Sea. Conclusions. For the first time, comprehensive studies carried out in the Black Sea, including measurements of the photosynthesis-light dependence, spectral light absorption coefficients by phytoplankton and spectral downwelling irradiance as a function of optical depths within the euphotic zone, made it possible to reveal the equation for calculating photosynthetic quantum yield. This new equation can be applied for calculating primary production of the Black Sea using a spectral approach, based both on the results of in situ measurements and remote sensing data.

scholarly journals On the light absorption characteristics of colored dissolved organic matter in Lake Dianshan

2007 ◽  
Vol 19 (3) ◽  
pp. 250-254
Author(s):  
SONG Lingling ◽  
◽  
QIU Yanling ◽  
ZHANG Hongen ◽  
LIU Dengguo ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Light Absorption ◽  
Colored Dissolved Organic Matter ◽  
Absorption Characteristics
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