Role of dissolved organic carbon in the attenuation of photosynthetically active and ultraviolet radiation in Adirondack lakes

Bukaveckas, Paul A.; Robbins-Forbes, Marise

doi:10.1046/j.1365-2427.2000.00518.x

Cited by 68 publications

(60 citation statements)

References 50 publications

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“…Although S values are related to the method of calculation and the wavelength range, the values in the Yunnan lakes were still high considering the difference of wavelengths. The S value was comparable to the mean value of 19.3 (for the 280-to 450-nm range) for 85 lakes in the Adirondack mountain region of New York State, U.S.A. (Bukaveckas and Robbins-Forbes 2000).…”

Section: Discussionsupporting

confidence: 69%

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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Section: Discussionsupporting

confidence: 69%

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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“…In the St. John's River, a blackwater river in northern Florida, Phlips and others observed a strong relationship between water color and vertical light attenuation (2000). Based on relationships between DOC and PAR attenuation in Adirondack lakes (Bukaveckas and Robbins-Forbes 2000), we roughly estimate how photic zone depth varies along our DOC gradient. Although the composition of the DOC pool likely differs between these lakes and the Florida rivers we studied, order-of-magnitude estimates show large differences in light penetration between spring and blackwater rivers.…”

Section: Discussionmentioning

confidence: 99%

Direct and Indirect Effects of Dissolved Organic Matter Source and Concentration on Denitrification in Northern Florida Rivers

Fork

Heffernan

2013

Ecosystems

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Using a natural gradient of dissolved organic carbon (DOC) source and concentration in rivers of northern Florida, we investigated how terrestriallyderived DOC affects denitrification rates in river sediments. Specifically, we examined if the higher concentrations of DOC in blackwater rivers stimulate denitrification, or whether such terrestriallyderived DOC supports lower denitrification rates because (1) it is less labile than DOC from aquatic primary production; whether (2) terrestrial DOC directly inhibits denitrification via biochemical mechanisms; and/or whether (3) terrestrial DOC indirectly inhibits denitrification via reduced light availability to-and thus DOC exudation byaquatic primary producers. We differentiated among these mechanisms using laboratory denitrification assays that subjected river sediments to factorial amendments of NO 3 -and dextrose, humic acid dosing, and cross-incubations of sediments and water from different river sources. DOC from terrestrial sources neither depressed nor stimulated denitrification rates, indicating low lability of this DOC but no direct inhibition; humic acid additions similarly did not affect denitrification rates. However, responses to addition of labile C increased with long-term average DOC concentration, which supports the hypothesis that terrestrial DOC indirectly inhibits denitrification via decreased autochthonous production. Observed and future changes in DOC concentration may therefore reduce the ability of inland waterways to remove reactive nitrogen.

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“…In addition, during each experiment water samples were taken from the epilimnion at 1.5 m depth with a Ruttner sampler (2 l) for analyses of water chemistry variables and chl a. The light conditions in the containers and the mixed layer of the lakes were calculated following Ramberg (1979) ) data obtained from the Swedish Meteorological and Hydrological Institute (SMHI) (www.smhi.se), the depths of the mixed layers (m), and diffuse light attenuation coefficients (k d ) calculated from lake dissolved organic carbon (DOC) concentrations (Bukaveckas & Robbins-Forbes 2000).…”

Section: Methodsmentioning

confidence: 99%

Phytoplankton responses to nitrogen and phosphorus enrichment in unproductive Swedish lakes along a gradient of atmospheric nitrogen deposition

Bergström¹,

Jönsson²,

Jansson³

2008

Aquat. Biol.

101

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Lake sampling and in situ nutrient enrichment enclosure experiments with nitrogen (N) and phosphorus (P) were conducted in unproductive Swedish lakes along a gradient of increasing atmospheric N-deposition. The regional and seasonal patterns of nutrient limitation of phytoplankton were clearly related to the amounts of N-deposition and N-inputs the lakes received. In areas of low N-deposition in northern Sweden, N-limitation of phytoplankton was evident throughout the summer season due to high catchment N-retention and very low dissolved inorganic N (DIN) inputs during the early summer. High N-deposition in the south was accompanied by high lake DIN-concentrations during the early summer and subsequent P-limitation of phytoplankton. However, P-limitation did not persist over the summer and, as a consequence of a declining DIN-pool, the lakes switched to dual-and co-limitation by N and P, and then to N-limitation. Generally, the lakes were N-limited rather than P-limited during the summer. We conclude that N-limitation is probably a natural state of the unproductive lakes studied, but P-limitation of variable intensity and duration has been induced by elevated atmospheric N-deposition.

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Role of dissolved organic carbon in the attenuation of photosynthetically active and ultraviolet radiation in Adirondack lakes

Cited by 68 publications

References 50 publications

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

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

Direct and Indirect Effects of Dissolved Organic Matter Source and Concentration on Denitrification in Northern Florida Rivers

Phytoplankton responses to nitrogen and phosphorus enrichment in unproductive Swedish lakes along a gradient of atmospheric nitrogen deposition

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