| Autor: |
N.A. Moiseeva, T.Ya. Churilova, T.V. Efimova, O.V. Krivenko, D.N. Matorin |
| Jazyk: |
angličtina |
| Rok vydání: |
2019 |
| Předmět: |
|
| Zdroj: |
Physical Oceanography, Vol 26, Iss 5, Pp 425-437 (2019) |
| Druh dokumentu: |
article |
| ISSN: |
1573-160X |
| DOI: |
10.22449/1573-160X-2019-5-425-437 |
| Popis: |
Purpose. At present the express method of estimating the chlorophyll a concentration by its fluorescence is widely spread. The applied in calculations coupling coefficient between these two values is assumed to be constant (in time and space); but it does not correspond to reality. Therefore, the basic purpose of the paper consists in studying dependence of fluorescence on the chlorophyll a concentration in the deep part of the Black Sea in a warm period when seasonal water stratification is observed. Methods and Results. Relation between the light absorption by the phytoplankton pigments, and the chlorophyll a concentration and fluorescence is investigated. It is shown that the ratio between the chlorophyll a concentration and fluorescence was different in the quasi-isolated layers during the seasonal water stratification. Revealed is the vertical heterogeneity of fluorescence normalized for the chlorophyll a concentration in the euphotic layer. It is conditioned by change of the phytoplankton ability to absorb light quanta at the wavelength ~455 nm (fluorescence excitation) calculated for a unit of the chlorophyll a content. Comparison of the specific values of fluorescence and light absorption index on the wavelength ~455 nm showed their strong mutual correlation that testifies to insignificant variation of the values of the fluorescence quantum yield within the photosynthesis zone. Conclusions. The obtained dependences between the chlorophyll a concentration and fluorescence can be used to specify the algorithms applied at present for reconstructing the chlorophyll a concentration profiles based on the data of either the fluorescence submerged probes or the drifting floats of the international project Biogeochemical Argo. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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