Parameterization of phytoplankton spectral absorption coefficients in the Baltic Sea: general, monthly and two-component variants of approximation formulas
<p>This paper presents approximate formulas (empirical equations) for parameterizing the coefficient of light absorption by phytoplankton <i>a</i><sub>ph</sub>(<i>λ</i>) in Baltic Sea surface waters. Over a thousand absorption spectra (in the 350–750&...
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2018-12-01
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| Series: | Ocean Science |
| Online Access: | https://www.ocean-sci.net/14/1523/2018/os-14-1523-2018.pdf |
| _version_ | 1818034829520797696 |
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| author | J. Meler S. B. Woźniak J. Stoń-Egiert B. Woźniak |
| author_facet | J. Meler S. B. Woźniak J. Stoń-Egiert B. Woźniak |
| author_sort | J. Meler |
| collection | DOAJ |
| description | <p>This paper presents
approximate formulas (empirical equations) for parameterizing the coefficient
of light absorption by phytoplankton <i>a</i><sub>ph</sub>(<i>λ</i>) in Baltic Sea
surface waters. Over a thousand absorption spectra (in the 350–750 nm
range), recorded during 9 years of research carried out in different months
of the year and in various regions of the southern and central Baltic, were
used to derive these parameterizations. The empirical material was
characterized by a wide range of variability: the total chlorophyll <i>a</i>
concentration (Tchl <i>a</i>) varied between 0.31 and 142 mg m<sup>−3</sup>, the
ratio of the sum of all accessory pigment concentrations to chlorophyll <i>a</i>
( <mo form="infix">∑</mo> <i>C</i><sub><i>i</i></sub>∕Tchl <i>a</i>) ranged between 0.21 and 1.5, and the
absorption coefficients <i>a</i><sub>ph</sub>(<i>λ</i>) at individual light
wavelengths varied over almost 3 orders of magnitude. Different versions of
the parameterization formulas were derived on the basis of these data: a
one-component parameterization in the <q>classic</q> form of a power function
with Tchl <i>a</i> as the only variable and a two-component formula – the
product of the power and exponential functions – with Tchl <i>a</i> and <mo form="infix">∑</mo> <i>C</i><sub><i>i</i></sub>∕Tchl <i>a</i> as variables. We found distinct differences between
the general version of the one-component parameterization and its variants
derived for individual months of the year. In contrast to the general variant
of parameterization, the new two-component variant takes account of the
variability of pigment composition occurring throughout the year in Baltic
phytoplankton populations.</p> |
| first_indexed | 2024-12-10T06:45:23Z |
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| id | doaj.art-887fe3b6f9b148108f6e6e0e69c9efb3 |
| institution | Directory Open Access Journal |
| issn | 1812-0784 1812-0792 |
| language | English |
| last_indexed | 2024-12-10T06:45:23Z |
| publishDate | 2018-12-01 |
| publisher | Copernicus Publications |
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| series | Ocean Science |
| spelling | doaj.art-887fe3b6f9b148108f6e6e0e69c9efb32022-12-22T01:58:40ZengCopernicus PublicationsOcean Science1812-07841812-07922018-12-01141523154510.5194/os-14-1523-2018Parameterization of phytoplankton spectral absorption coefficients in the Baltic Sea: general, monthly and two-component variants of approximation formulasJ. Meler0S. B. Woźniak1J. Stoń-Egiert2B. Woźniak3Institute of Oceanology, Polish Academy of Sciences, Powstańców Warszawy 55, 81-712 Sopot, PolandInstitute of Oceanology, Polish Academy of Sciences, Powstańców Warszawy 55, 81-712 Sopot, PolandInstitute of Oceanology, Polish Academy of Sciences, Powstańców Warszawy 55, 81-712 Sopot, PolandInstitute of Oceanology, Polish Academy of Sciences, Powstańców Warszawy 55, 81-712 Sopot, Poland<p>This paper presents approximate formulas (empirical equations) for parameterizing the coefficient of light absorption by phytoplankton <i>a</i><sub>ph</sub>(<i>λ</i>) in Baltic Sea surface waters. Over a thousand absorption spectra (in the 350–750 nm range), recorded during 9 years of research carried out in different months of the year and in various regions of the southern and central Baltic, were used to derive these parameterizations. The empirical material was characterized by a wide range of variability: the total chlorophyll <i>a</i> concentration (Tchl <i>a</i>) varied between 0.31 and 142 mg m<sup>−3</sup>, the ratio of the sum of all accessory pigment concentrations to chlorophyll <i>a</i> ( <mo form="infix">∑</mo> <i>C</i><sub><i>i</i></sub>∕Tchl <i>a</i>) ranged between 0.21 and 1.5, and the absorption coefficients <i>a</i><sub>ph</sub>(<i>λ</i>) at individual light wavelengths varied over almost 3 orders of magnitude. Different versions of the parameterization formulas were derived on the basis of these data: a one-component parameterization in the <q>classic</q> form of a power function with Tchl <i>a</i> as the only variable and a two-component formula – the product of the power and exponential functions – with Tchl <i>a</i> and <mo form="infix">∑</mo> <i>C</i><sub><i>i</i></sub>∕Tchl <i>a</i> as variables. We found distinct differences between the general version of the one-component parameterization and its variants derived for individual months of the year. In contrast to the general variant of parameterization, the new two-component variant takes account of the variability of pigment composition occurring throughout the year in Baltic phytoplankton populations.</p>https://www.ocean-sci.net/14/1523/2018/os-14-1523-2018.pdf |
| spellingShingle | J. Meler S. B. Woźniak J. Stoń-Egiert B. Woźniak Parameterization of phytoplankton spectral absorption coefficients in the Baltic Sea: general, monthly and two-component variants of approximation formulas Ocean Science |
| title | Parameterization of phytoplankton spectral absorption coefficients in the Baltic Sea: general, monthly and two-component variants of approximation formulas |
| title_full | Parameterization of phytoplankton spectral absorption coefficients in the Baltic Sea: general, monthly and two-component variants of approximation formulas |
| title_fullStr | Parameterization of phytoplankton spectral absorption coefficients in the Baltic Sea: general, monthly and two-component variants of approximation formulas |
| title_full_unstemmed | Parameterization of phytoplankton spectral absorption coefficients in the Baltic Sea: general, monthly and two-component variants of approximation formulas |
| title_short | Parameterization of phytoplankton spectral absorption coefficients in the Baltic Sea: general, monthly and two-component variants of approximation formulas |
| title_sort | parameterization of phytoplankton spectral absorption coefficients in the baltic sea general monthly and two component variants of approximation formulas |
| url | https://www.ocean-sci.net/14/1523/2018/os-14-1523-2018.pdf |
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