Colored dissolved organic matter and dissolved organic carbon exclusion from lake ice: Implications for irradiance transmission and carbon cycling

Belzile, Claude; Gibson, John A.E.; Vincent, Warwick F.

doi:10.4319/lo.2002.47.5.1283

Cited by 130 publications

(143 citation statements)

References 43 publications

(61 reference statements)

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“…Warmer winters will result in a shortening of the period with snow and ice cover. The importance of wintertime climatic control on DOC dynamics in lakes has already been identified by Belzile et al (2002), Park et al (2005), Karlsson et al (2008), and. From these studies, DOC concentrations are expected to increase along with warmer winters.…”

Section: Discussionmentioning

confidence: 99%

Nonlinear response of dissolved organic carbon concentrations in boreal lakes to increasing temperatures

Weyhenmeyer

Karlsson

2009

Limnology & Oceanography

141

103

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Recent increases in concentrations of dissolved organic carbon (DOC) in lakes and rivers over large regions have been related to both changes in the climate and in atmospheric deposition chemistry. Using a data set of 1041 boreal lakes along a 13u latitudinal gradient, sampled in 1995, 2000, and 2005, and an additional data set of 90 lakes along a 1000-m altitudinal gradient at 68uN, we show that DOC concentrations increase in a nonlinear way along a latitudinal and altitudinal temperature gradient. The nonlinear relation of DOC to increasing temperatures was consistent over space and time. Out of 14 meteorological, catchment, morphometric, and atmospheric deposition variables tested, the variable best explaining this kind of nonlinear pattern was the number of days when air temperatures exceeded 0uC, i.e., the duration of the main growing and runoff season (D T.0 ). Using D T.0 as an input variable, we were able to predict the nonlinear temperature response of DOC concentrations, both spatially (R 2 5 0.90, p , 0.0001) and temporally (R 2 5 0.90, p , 0.0001). D T.0 has an advantage over other variables because it includes the time factor, which is decisive for the duration that biogeochemical processes can take place. We suggest that DOC concentrations in lakes are influenced by climate change and that present temperature increases over Sweden result in an accelerated DOC increase toward warmer geographical regions.In humic lakes, the pool of organic carbon is dominated by dissolved organic carbon (DOC) imported from terrestrial surroundings. Terrestrial DOC plays a key role in aquatic ecosystems because it affects lake productivity, community structure, and metabolic balances (Jones 1998;Jansson et al. 2000 Jansson et al. , 2007, the global carbon budget ), the availability of dissolved nutrients and metals (Franco and Heath 1983), and the thermal structure (Fee et al. 1996) and optical properties of water bodies (Morris et al. 1995). Recently, an increase in DOC concentrations over large regions in the Northern Hemisphere over the last decades has been observed (Monteith et al. 2007). Temporal changes in DOC concentrations have been attributed to changes in runoff (Andersson et al. 1991;Schindler et al. 1997;Erlandsson et al. 2008 (2003) proposed that concentrations and fluxes of DOC are more strongly related to climate and topography than to internal properties.Considering that the majority of the climate-related drivers for DOC concentrations in lakes, such as runoff and temperature, show large variations between seasons at northern latitudes, we were interested to see whether temporal and spatial differences in length of seasons might have an effect on DOC concentrations in lakes. We hypothesized that the length of the main growing season, when main runoff events also take place, is a significant predictor for DOC concentrations in lakes, both on a spatial and a temporal basis. To test the hypothesis, we used a data set of 1041 boreal lakes along a 13u latitudinal gradient from three lake invento...

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Section: Discussionmentioning

confidence: 99%

Nonlinear response of dissolved organic carbon concentrations in boreal lakes to increasing temperatures

Weyhenmeyer

Karlsson

2009

Limnology & Oceanography

141

103

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“…In a recent study, Belzile et al (2002) demonstrated that the exclusion factor for natural organic matter from Canadian lakes is typically greater than twice the exclusion factor for inorganic solutes. Only lesscomplex, low-molecular-weight molecules were retained in the ice.…”

Section: Resultsmentioning

confidence: 99%

Evidence for terrigenous dissolved organic nitrogen in the Arctic deep sea

Dittmar

2004

Limnology & Oceanography

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To trace the fate of terrigenous dissolved organic nitrogen (DON) in the Arctic Ocean, principal-components analyses (PCA) was used on a data set of 13 amino acids released via hydrolyses from a total of 110 water samples from Russian rivers, adjacent near-shore locations, and the Laptev Sea. The first component of the PCA distinguished significantly between terrigenous DON from the rivers (1.2 Ϯ 0.1) and marine-derived DON in the deep central Arctic Ocean (Ϫ1.1 Ϯ 0.2). The significance of this distinction was validated with amino acid data from seawater and river samples from other regions. The second PCA component correlated significantly with the proportion of D-alanine, a tracer for microbial degradation. The percentage of terrigenous DON in the Arctic Ocean was assessed from the first PCA component. The model was calibrated using data from the rivers (100% terrigenous) and the deep central Arctic Ocean (ϳ0% terrigenous) as end members. Terrigenous DON accounted for 28 Ϯ 13% of the total DON on the Laptev Sea shelf, which is in good agreement with independent, lignin-based estimates. High proportions of terrigenous DON (up to 100%) were calculated for the continental slope down to 2,000 m depth and are probably due to downward convection of brine-enriched shelf waters. The model presented here provides the first direct evidence of terrigenous DON in the deep sea. The model may be directly applied to trace the fate of terrigenous DON in other terrestrially dominated marine environments.

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“…The slopes of FDOM P concentrations against DOC concentrations varied significantly over different seasons, with steeper gradients in the spring (March and April) and fall (October). In general, FDOM P is known to be produced efficiently by biological production in water (Coble, 1996;Belzile et al, 2002;Steinberg et al, 2004;Zhao et al, 2017). Thus, higher FDOM P concentrations relative to DOC concentrations in the spring and fall seem to be associated with the spring and fall phytoplankton blooms in river waters (Mayer et al, 1999;Zhang et al, 2009).…”

Section: Behaviors and Sources Of Fdom In The Estuarine Mixing Zonementioning

confidence: 99%

Sources, fluxes, and behaviors of fluorescent dissolved organic matter (FDOM) in the Nakdong River Estuary, Korea

Lee¹,

Kim²

2018

Biogeosciences

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Abstract. We monitored seasonal variations in dissolved organic carbon (DOC), the stable carbon isotope of DOC (δ 13 C-DOC), and fluorescent dissolved organic matter (FDOM) in water samples from a fixed station in the Nakdong River Estuary, Korea. Sampling was performed every hour during spring tide once a month from October 2014 to August 2015. The concentrations of DOC and humic-like FDOM showed significant negative correlations against salinity (r 2 = 0.42-0.98, p < 0.0001), indicating that the river-originated DOM components were the major source and behave conservatively in the estuarine mixing zone. The extrapolated δ 13 C-DOC values (−27.5 to −24.5 ‰) in fresh water confirm that both components are mainly of terrestrial origin. The slopes of humic-like FDOM against salinity were 60-80 % higher in the summer and fall due to higher terrestrial production of humic-like FDOM. The slopes of proteinlike FDOM against salinity, however, were 70-80 % higher in spring due to higher biological production in river water. Our results suggest that there are large seasonal changes in riverine fluxes of humic-and protein-like FDOM to the ocean.

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Colored dissolved organic matter and dissolved organic carbon exclusion from lake ice: Implications for irradiance transmission and carbon cycling

Cited by 130 publications

References 43 publications

Nonlinear response of dissolved organic carbon concentrations in boreal lakes to increasing temperatures

Nonlinear response of dissolved organic carbon concentrations in boreal lakes to increasing temperatures

Evidence for terrigenous dissolved organic nitrogen in the Arctic deep sea

Sources, fluxes, and behaviors of fluorescent dissolved organic matter (FDOM) in the Nakdong River Estuary, Korea

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