Spectral attenuation of solar ultraviolet radiation in humic lakes in Central Finland

Huovinen, Pirjo; Penttilä, H.; Soimasuo, Markus

doi:10.1016/s0045-6535(02)00634-3

Cited by 102 publications

(52 citation statements)

References 25 publications

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“…The higher values of a (250 nm)/a (365 nm) were found at the center of the lake, which was corresponding to smaller molecules. From the a (250 nm)/a (365 nm) values, the lake regions with higher humic content had larger humic molecules as compared to the clear lake regions in this study, which was also confirmed by Yacobi et al [16] and Huovinen et al [25].…”

Section: Spectral Slope S Calculationsupporting

confidence: 90%

“…However, CDOM absorption values are close to the results found in large shallow fluvial lake-Lake Saint-Pierre [12] and by other researchers [3,20] but lower those observed in rivers [16]. The ratio of a(250 nm) and a(365 nm) was recorded from 6.14 to 8.38 with a mean value of (7.22 ± 0.65) which was close to the results of other studies [25,26]. The higher values of a (250 nm)/a (365 nm) were found at the center of the lake, which was corresponding to smaller molecules.…”

Section: Spectral Slope S Calculationsupporting

confidence: 90%

“…The DOC concentrations ranged from a maximum of 20.19 mg L Ϫ1 at sampling site 6# located at the mouth of River Lujiang to a minimum of 8.75 mg L Ϫ1 at sampling site 8# situated at the center of Lake Taihu with the average value (13.10 ± 3.51) mg L Ϫ1 , which was quite high corresponding to other clear and humic lakes [12,20,25] but lower than those in rivers [16,27]. The spatial distribution of DOC is similar to that of CDOM.…”

Section: Relationship Between Cdom Absorption and Docmentioning

confidence: 99%

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A Preliminary Study of Chromophoric Dissolved Organic Matter (CDOM) in Lake Taihu, a Shallow Subtropical Lake in China

Zhang

Qin

Chen

et al. 2005

Acta hydrochim. hydrobiol.

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Section: Spectral Slope S Calculationsupporting

confidence: 90%

Section: Spectral Slope S Calculationsupporting

confidence: 90%

Section: Relationship Between Cdom Absorption and Docmentioning

confidence: 99%

See 1 more Smart Citation

A Preliminary Study of Chromophoric Dissolved Organic Matter (CDOM) in Lake Taihu, a Shallow Subtropical Lake in China

Zhang

Qin

Chen

et al. 2005

Acta hydrochim. hydrobiol.

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“…Thus, any dissolved or particulate matter in the water that specifically attenuates discrete spectral ranges would render the spectrum of aquatic irradiance less 'smooth', or having greater energy at high frequencies. This may include, for example, attenuation by algae, bacteria, organic debris and minerals (Huovinen et al, 2003;Belzile et al, 2004;Morel et al, 2007). Additionally, the spectrum of aquatic irradiance can narrow considerably with depth, but still exhibit considerable energy at relatively high frequencies, leading to high complexity.…”

Section: Complexity Of Aquatic and Celestial Irradiancementioning

confidence: 99%

High complexity of aquatic irradiance may have driven the evolution of four-dimensional colour vision in shallow-water fish

Sabbah

Troje

Gray

et al. 2013

Journal of Experimental Biology

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SUMMARYHumans use three cone photoreceptor classes for colour vision, yet many birds, reptiles and shallow-water fish are tetrachromatic and use four cone classes. Screening pigments, which narrow the spectrum of photoreceptors in birds and diurnal reptiles, render visual systems with four cone classes more efficient. To date, however, the question of tetrachromacy in shallowwater fish that, like humans, lack screening pigments, is still unsolved. We raise the possibility that tetrachromacy in fish has evolved in response to higher spectral complexity of underwater light. We compared the dimensionality of colour vision in humans and fish by examining the spectral complexity of the colour signal reflected from objects into their eyes. We show that fish require four to six cone classes to reconstruct the colour signal of aquatic objects at the accuracy level achieved by humans viewing terrestrial objects. This is because environmental light, which alters the colour signals, is more complex and contains more spectral fluctuations underwater than on land. We further show that fish cones are better suited than human cones to detect these spectral fluctuations, suggesting that the capability of fish cones to detect high-frequency fluctuations in the colour signal confers an advantage. Taken together, we propose that tetrachromacy in fish has evolved to enhance the reconstruction of complex colour signals in shallow aquatic environments. Of course, shallow-water fish might possess fewer than four cone classes; however, this would come with the inevitable loss in accuracy of signal reconstruction. Supplementary material available online at

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“…In different aquatic ecosystems, UV-B attenuation coeffi cients range from 0.02 to 60 m −1 (Williamson et al 1996;Vincent et al 1998;Arts et al 2000;Rae et al 2001;Sommaruga 2001;Huovinen et al 2003;Frost et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Variation of chromophoric dissolved organic matter and possible attenuation depth of ultraviolet radiation in Yunnan Plateau lakes

Zhang

Liu

et al. 2007

Limnology

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The increase of ultraviolet radiation (UVR, 280-400 nm) caused by stratospheric ozone depletion has profound effects on aquatic ecosystems. High-altitude lakes in the Yunnan Plateau are exposed to high intensities of UVR and contain low concentrations of chromophoric dissolved organic matter (CDOM). Thirty-eight lakes in the Yunnan Plateau with elevations from 1291 to 3809 m above sea level were investigated to study CDOM concentrations and possible effects of UVR on the lake ecosystem. The attenuation of UVR in the Yunnan Plateau lakes was calculated from the absorption coeffi cient of CDOM based on an empirical relationship from lakes in the Alps and Pyrenees mountains. Absorption coeffi cients [a(λ)] at 320 nm [a(320)] ranged from 0.52 to 14.05 m −1 (mean ± standard deviation, 4.40 ± 3.85 m −1 ) and at 380 nm [a(380)] from 0.05 to 4.51 m −1 (1.40 ± 1.30 m −1 ). The exponential slope coeffi cient for the relationship of wavelength to a(λ) ranged from 16.2 to 41.4 µm −1 (21.74 ± 4.93 µm −1 ) over the 280-400 nm interval. Normalized fl uorescence emission (NFLU) at 450 nm from an excitation wavelength of 355 nm, F n (355), averaged 7.93 ± 3.22 NFLU. A signifi cant positive relationship was found between a(355) and F n (355). The estimated diffuse attenuation coeffi cients of UV-B (320 nm) and UV-A (380 nm) ranged from 0.55 to 15.77 m −1 and from 0.24 to 6.73 m −1 ; the corresponding 1% attenuation depths ranged from 0.29 to 8.44 m and from 0.68 to 19.12 m. Twenty-fi ve of 38 lakes had 1% UV-B attenuation depths of 1.5 m or more. The median 1% attenuation depth was 28.8% of the sampling depth for UV-B radiation and 60% for UV-A. In addition to CDOM, chlorophyll a (Chla) and total suspended matter (TSM) also may contribute to attenuation of UVR.

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Spectral attenuation of solar ultraviolet radiation in humic lakes in Central Finland

Cited by 102 publications

References 25 publications

A Preliminary Study of Chromophoric Dissolved Organic Matter (CDOM) in Lake Taihu, a Shallow Subtropical Lake in China

A Preliminary Study of Chromophoric Dissolved Organic Matter (CDOM) in Lake Taihu, a Shallow Subtropical Lake in China

High complexity of aquatic irradiance may have driven the evolution of four-dimensional colour vision in shallow-water fish

Variation of chromophoric dissolved organic matter and possible attenuation depth of ultraviolet radiation in Yunnan Plateau lakes

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