Variability in the Index of Light Absorption by a Yellow Substance in the Surface Layer of Lake Teletskoye

2018 ◽  
Vol 31 (5) ◽  
pp. 532-538
Author(s):  
O. B. Akulova ◽  
V. I. Bukatyi ◽  
K. P. Popov
Keyword(s):  
Surface Layer ◽  
Light Absorption ◽  
Lake Teletskoye ◽  
Yellow Substance

scholarly journals Light Absorption by Metals with Porous Surface Layer Formed by Oxidization–Reduction Treatment

2012 ◽  
Vol 53 (9) ◽  
pp. 1556-1562 ◽  
Author(s):  
Masanori Suzuki ◽  
Toshifumi Yamamoto ◽  
Yohei Katayama ◽  
Soichiro Kuwata ◽  
Toshihiro Tanaka
Keyword(s):  
Surface Layer ◽  
Light Absorption ◽  
Porous Surface ◽  
Reduction Treatment

scholarly journals Optical characteristics of water at the mouth of the Ob River

2021 ◽  
pp. 1147-1151
Author(s):  
O.B. Akulova ◽  
◽  
V.I. Bukaty ◽  
V.V. Kirillov ◽  
◽  
...  
Keyword(s):  
Light Absorption ◽  
Light Attenuation ◽  
River Mouth ◽  
Field Studies ◽  
Optical Characteristics ◽  
Ob River ◽  
Average Value ◽  
Yellow Substance ◽  
Maximum Development ◽  
Maximum Content

Abstract. As a result of the field studies (August 25 September 1, 2020), new data were obtained on the optical characteristics of water at the Ob River mouth near the Salemal village (Yamal region, Yamal-Nenets Autonomous Okrug) during the lowest water level and the maximum development of hydrobiocenoses. We calculated the light attenuation coefficient ( ) in the spectral range from 400 to 800 nm, which varied from 1.5 to 21.5 m 1 during the study period, and the light absorption by yellow substance ys( ) from 0.1 to 12.2 m 1. Concentrations of yellow substance Cys and chlorophyll Chl were determined. For instance, chlorophyll concentrations in water samples taken at different stations of the Ob River ranged from 12.5 to 22.7 mg m 3. The maximum content of chlorophyll in our case was recorded at a depth of 14 m (station 5.3), which was 22.7 mg m 3. The yellow substance concentration determined optically by the calculated yellow substance light absorption coefficient at wavelength =450 nm ranged within 18.8 and 26.9 g m 3 with an average value of 22.1 g m 3. The average value of ys( ) at =450 nm over the study period was 4.7 m 1.

scholarly journals Inter-Annual Variability of the Seawater Light Absorption in Surface Layer of the Northeastern Black Sea in Connection with Hydrometeorological Factors

2019 ◽  
Vol 7 (9) ◽  
pp. 326 ◽  
Author(s):  
Anna Yushmanova ◽  
Oleg Kopelevich ◽  
Svetlana Vazyulya ◽  
Inna Sahling
Keyword(s):  
Surface Layer ◽  
Black Sea ◽  
Light Absorption ◽  
Vertical Mixing ◽  
Field Studies ◽  
The Black Sea ◽  
Strong Wind ◽  
Science And Engineering ◽  
Main Factor

Data on the light absorption by seawater and its components are needed in many theoretical and practical aspects of marine science and engineering. However, up to now, there is a lack of such data for the northeastern part of the Black Sea. This article presents the data on light absorption measured by a portable integrated cavity absorption meter (ICAM) spectrophotometer in the Gelendzhik region of the Black Sea during field studies in June 2017 and 2018, together with other bio-optical and oceanographic data from in situ measurements and satellite observations. In 2018, the elevated values of the colored dissolved organic matter (CDOM) absorption in the surface layer were observed concurrently with high values of salinity, contradicting the idea of river runoff being the main CDOM source. The vertical profiles of salinity differed in 2017 and 2018, especially in shallow waters; in the upper layer, the salinity increased from 17.1 psu in 2017 to 17.8 psu in 2018, while the values of CDOM absorption increased from 0.10 to 0.16 m−1. The analysis of available hydrometeorological data pointed to intensive vertical mixing due to the strong wind forcing as a main factor in increasing values of both salinity and the CDOM absorption in the surface layer in 2018.

scholarly journals Application of Satellite Data for Retrieving the Light Absorption Characteristics in the Black Sea Waters

2021 ◽  
Vol 28 (2) ◽  
Author(s):  
V. S. Suetin ◽  
S. N. Korolev ◽  
◽  
Keyword(s):  
Chlorophyll A ◽  
Black Sea ◽  
Satellite Data ◽  
Light Absorption ◽  
The Black Sea ◽  
Universal Method ◽  
Chlorophyll A Concentration ◽  
Inherent Optical Properties ◽  
Yellow Substance ◽  
The Crimea

Purpose. he work is aimed at studying the effects of light absorption in the Black Sea waters with due regard for the variations of its individual components, and how they are manifested in the NASA archival results of calculating the chlorophyll a concentration obtained by processing satellite data using the universal operational method. Methods and Results. The NASA archival data of the MODIS and SeaWiFS satellite instruments, and the values of the light absorption components (determined by the method of Generalized ocean color inversion model for retrieving marine inherent optical properties (GIOP)) related to yellow substance and phytoplankton were analyzed. In order to avoid possible manifestations of various distortions in the results of determining the remote sensing reflectance of the sea and in the products resulted from application of the GIOP method, only the specially selected and sufficiently reliable test data from two areas located near the Crimea Southern Coast and south of the Danube estuary were used. Conclusions. In the considered examples with low content of chlorophyll a in the seawater, the yellow substance plays a predominant role in light absorption in the spectrum blue part, whereas if the chlorophyll a content is high, the phytoplankton contribution is dominant. The revealed relationship between the light absorption components related to yellow substance and phytoplankton significantly differs from that implicitly preset as a basis of the universal method (applied in NASA for the satellite data operational processing) for determining the chlorophyll a concentration. This, in its turn, is manifested in the fact that the data on the chlorophyll a concentration in the Black Sea stored in the NASA archive may be overestimated in case the chlorophyll a concentration is low, and underestimated – in case it is high.

scholarly journals Application of Satellite Data for Retrieving the Light Absorption Characteristics in the Black Sea Waters

2021 ◽  
Vol 37 (2) ◽  
Author(s):  
V. S. Suetin ◽  
S. N. Korolev ◽  
◽  
Keyword(s):  
Chlorophyll A ◽  
Black Sea ◽  
Satellite Data ◽  
Light Absorption ◽  
The Black Sea ◽  
Universal Method ◽  
Chlorophyll A Concentration ◽  
Inherent Optical Properties ◽  
Yellow Substance ◽  
The Crimea

Purpose. The work is aimed at studying the effects of light absorption in the Black Sea waters with due regard for the variations of its individual components, and how they are manifested in the NASA archival results of calculating the chlorophyll a concentration obtained by processing satellite data using the universal operational method. Methods and Results. The NASA archival data of the MODIS and SeaWiFS satellite instruments, and the values of the light absorption components (determined by the method of Generalized ocean color inversion model for retrieving marine inherent optical properties (GIOP)) related to yellow substance and phytoplankton were analyzed. In order to avoid possible manifestations of various distortions in the results of determining the remote sensing reflectances of the sea and in the products resulted from application of the GIOP method, only the specially selected and sufficiently reliable test data from two areas located near the Crimea Southern Coast and south of the Danube estuary were used. Conclusions. In the considered examples with low content of chlorophyll a in the seawater, the yellow substance plays a predominant role in light absorption in the spectrum blue part, whereas if the chlorophyll a content is high, the phytoplankton contribution is dominant. The revealed relationship between the light absorption components related to yellow substance and phytoplankton significantly differs from that implicitly preset as a basis of the universal method (applied in NASA for the satellite data operational processing) for determining the chlorophyll a concentration. This, in its turn, is manifested in the fact that the data on the chlorophyll a concentration in the Black Sea stored in the NASA archive may be overestimated in case the chlorophyll a concentration is low, and underestimated – in case it is high.

Sign in / Sign up

Export Citation Format

Share Document