Contribution to a bio-optical model for remote sensing of Lena River water
Bio-optical measurements and sampling were carried out in the delta of the Lena River (northern Siberia, Russia) between 26 June and 4 July 2011. The aim of this study was to determine the inherent optical properties of the Lena water, i.e., absorption, attenuation, and scattering coefficients, dur...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2013-11-01
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| Series: | Biogeosciences |
| Online Access: | http://www.biogeosciences.net/10/7081/2013/bg-10-7081-2013.pdf |
| _version_ | 1811203103625576448 |
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| author | H. Örek R. Doerffer R. Röttgers M. Boersma K. H. Wiltshire |
| author_facet | H. Örek R. Doerffer R. Röttgers M. Boersma K. H. Wiltshire |
| author_sort | H. Örek |
| collection | DOAJ |
| description | Bio-optical measurements and sampling were carried out in the delta of the
Lena River (northern Siberia, Russia) between 26 June and 4 July 2011. The
aim of this study was to determine the inherent optical properties of the
Lena water, i.e., absorption, attenuation, and scattering coefficients, during
the period of maximum runoff. This aimed to contribute to the development
of a bio-optical model for use as the basis for optical remote sensing of
coastal water of the Arctic. In this context the absorption by CDOM (colored
dissolved organic matter) and particles, and the concentrations of total suspended matter, phytoplankton-pigments, and carbon were measured. CDOM
was found to be the most dominant parameter affecting the optical properties
of the river, with an absorption coefficient of 4.5–5 m<sup>−1</sup> at 442 nm,
which was almost four times higher than total particle absorption values at
visible wavelength range. The wavelenght-dependence of absorption of the different water constituents was chracterized by determining the semi logarithmic
spectral slope. Mean CDOM, and detritus slopes were 0.0149
nm<sup>−1</sup>(standard deviation (stdev) = 0.0003, <i>n</i> = 18), and 0.0057
nm<sup>−1</sup> (stdev = 0.0017, <i>n</i> = 19), respectively, values which are
typical for water bodies with high concentrations of dissolved and
particulate carbon. Mean chlorophyll <i>a</i> and total suspended matter were 1.8 mg m<sup>−3</sup> (stdev = 0.734 <i>n</i> = 18) and 31.9 g m<sup>−3</sup>
(stdev = 19.94, <i>n</i> = 27), respectively. DOC (dissolved organic carbon) was in the range 8–10 g m<sup>−3</sup> and the
total particulate carbon (PC) in the range 0.25–1.5 g m<sup>−3</sup>. The light
penetration depth (Secchi disc depth) was in the range 30–90 cm and was
highly correlated with the suspended matter concentration. The period of
maximum river runoff in June was chosen to obtain bio-optical data when
maximum water constituents are transported into the Laptev Sea. However, we
are aware that more data from other seasons and other years need to be
collected to establish a general bio-optical model of the Lena water and
conclusively characterize the light climate with respect to primary
production. |
| first_indexed | 2024-04-12T02:50:09Z |
| format | Article |
| id | doaj.art-e7ab6c371bdc4f70a214c7750eed82c5 |
| institution | Directory Open Access Journal |
| issn | 1726-4170 1726-4189 |
| language | English |
| last_indexed | 2024-04-12T02:50:09Z |
| publishDate | 2013-11-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Biogeosciences |
| spelling | doaj.art-e7ab6c371bdc4f70a214c7750eed82c52022-12-22T03:51:02ZengCopernicus PublicationsBiogeosciences1726-41701726-41892013-11-0110117081709410.5194/bg-10-7081-2013Contribution to a bio-optical model for remote sensing of Lena River waterH. Örek0R. Doerffer1R. Röttgers2M. Boersma3K. H. Wiltshire4Helmholtz-Zentrum Geesthacht, Centre for Materials and Research, Institute for Coastal Research, Max-Planck-Str. 1., 21502 Geesthacht, GermanyHelmholtz-Zentrum Geesthacht, Centre for Materials and Research, Institute for Coastal Research, Max-Planck-Str. 1., 21502 Geesthacht, GermanyHelmholtz-Zentrum Geesthacht, Centre for Materials and Research, Institute for Coastal Research, Max-Planck-Str. 1., 21502 Geesthacht, GermanyAlfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Biologische Anstalt Helgoland, P.O. Box 180, 27483 Helgoland, GermanyAlfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Biologische Anstalt Helgoland, P.O. Box 180, 27483 Helgoland, GermanyBio-optical measurements and sampling were carried out in the delta of the Lena River (northern Siberia, Russia) between 26 June and 4 July 2011. The aim of this study was to determine the inherent optical properties of the Lena water, i.e., absorption, attenuation, and scattering coefficients, during the period of maximum runoff. This aimed to contribute to the development of a bio-optical model for use as the basis for optical remote sensing of coastal water of the Arctic. In this context the absorption by CDOM (colored dissolved organic matter) and particles, and the concentrations of total suspended matter, phytoplankton-pigments, and carbon were measured. CDOM was found to be the most dominant parameter affecting the optical properties of the river, with an absorption coefficient of 4.5–5 m<sup>−1</sup> at 442 nm, which was almost four times higher than total particle absorption values at visible wavelength range. The wavelenght-dependence of absorption of the different water constituents was chracterized by determining the semi logarithmic spectral slope. Mean CDOM, and detritus slopes were 0.0149 nm<sup>−1</sup>(standard deviation (stdev) = 0.0003, <i>n</i> = 18), and 0.0057 nm<sup>−1</sup> (stdev = 0.0017, <i>n</i> = 19), respectively, values which are typical for water bodies with high concentrations of dissolved and particulate carbon. Mean chlorophyll <i>a</i> and total suspended matter were 1.8 mg m<sup>−3</sup> (stdev = 0.734 <i>n</i> = 18) and 31.9 g m<sup>−3</sup> (stdev = 19.94, <i>n</i> = 27), respectively. DOC (dissolved organic carbon) was in the range 8–10 g m<sup>−3</sup> and the total particulate carbon (PC) in the range 0.25–1.5 g m<sup>−3</sup>. The light penetration depth (Secchi disc depth) was in the range 30–90 cm and was highly correlated with the suspended matter concentration. The period of maximum river runoff in June was chosen to obtain bio-optical data when maximum water constituents are transported into the Laptev Sea. However, we are aware that more data from other seasons and other years need to be collected to establish a general bio-optical model of the Lena water and conclusively characterize the light climate with respect to primary production.http://www.biogeosciences.net/10/7081/2013/bg-10-7081-2013.pdf |
| spellingShingle | H. Örek R. Doerffer R. Röttgers M. Boersma K. H. Wiltshire Contribution to a bio-optical model for remote sensing of Lena River water Biogeosciences |
| title | Contribution to a bio-optical model for remote sensing of Lena River water |
| title_full | Contribution to a bio-optical model for remote sensing of Lena River water |
| title_fullStr | Contribution to a bio-optical model for remote sensing of Lena River water |
| title_full_unstemmed | Contribution to a bio-optical model for remote sensing of Lena River water |
| title_short | Contribution to a bio-optical model for remote sensing of Lena River water |
| title_sort | contribution to a bio optical model for remote sensing of lena river water |
| url | http://www.biogeosciences.net/10/7081/2013/bg-10-7081-2013.pdf |
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