Origin, accumulation and fate of dissolved organic matter in an extreme hypersaline shallow lake

Butturini, Andrea; Herzsprung, Peter; Lechtenfeld, Oliver J.; Alcorno, P.; Benaiges-Fernandez, R.; Berlanga, Mercedes; Boadella, Judit; Campillo, Z. Freixinos; Gomez, R.M.; Sánchez-Montoya, M. M.; Urmeneta, J.; Romaní, A.M.

doi:10.1016/j.watres.2022.118727

Cited by 16 publications

(3 citation statements)

References 63 publications

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“…In accordance with studies in other semiarid lakes, 23,47 saline lakes (Cuo'e and Selin Co) had a higher DOC concentration compared with the freshwater lakes, which is likely due to long water retention times and the role of evaporation (Figure 2), as well as the contribution of autochthonous input from phytoplankton growth. 48,49 Furthermore, as terminal waters in the watershed, the saline lakes receive and accumulate DOM. 9 The river samples showed overall lower DOC concentrations than the lake samples, suggesting an accumulative effect as well as likely the role of autochthonous production of DOM in lakes.…”

Section: ■ Discussionmentioning

confidence: 99%

Hydrological Controls on Dissolved Organic Matter Composition throughout the Aquatic Continuum of the Watershed of Selin Co, the Largest Lake on the Tibetan Plateau

Zhou

Zhang

et al. 2023

Environ. Sci. Technol.

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Alpine river and lake systems on the Tibetan Plateau are highly sensitive indicators and amplifiers of global climate change and important components of the carbon cycle. Dissolved organic matter (DOM) encompasses organic carbon in aquatic systems, yet knowledge about DOM variation throughout the river−lake aquatic continuum within alpine regions is limited. We used optical spectroscopy, ultrahigh-resolution mass spectrometry (Fourier transform ion cyclotron resonance mass spectrometry), and stable water isotopic measurements to evaluate linkages between DOM composition and hydrological connection. We investigated glacial influences on DOM composition throughout the watershed of Selin Co, including upstream glacier-fed rivers and downstream-linked lakes. We found that the dissolved organic carbon concentration increased, whereas specific ultraviolet absorbance (SUVA 254 ) decreased along the river−lake continuum. Relative to rivers, the downstream lakes had low relative abundances of polyphenolic and condensed aromatic compounds and humic-like substances but increased relative abundances of aliphatics and protein-like compounds. SUVA 254 decreased while proteinlike components increased with enriched stable water isotope δ 2 H-H 2 O, indicating that DOM aromaticity declined while autochthonous production increased along the flow paths. Glacier meltwater contributed to elevated relative abundances of aliphatic and protein-like compounds in headwater streams, while increased relative abundances of aromatics and humic-like DOM were found in glacier-fed lakes than downstream lakes. We conclude that changes in hydrological conditions, including glacier melt driven by a warming climate, will significantly alter DOM composition and potentially their biogeochemical function in surface waters on the Tibetan Plateau.

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Section: ■ Discussionmentioning

confidence: 99%

Hydrological Controls on Dissolved Organic Matter Composition throughout the Aquatic Continuum of the Watershed of Selin Co, the Largest Lake on the Tibetan Plateau

Zhou

Zhang

et al. 2023

Environ. Sci. Technol.

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“…The preliminary results showed that the effects of salinity on most spectroscopic characteristics were lower than 10% (Figure S1). As such effects were relatively small, we conducted direct measurements on the filtered and diluted water samples (DOC < 5 mg L –1 and salinity <10) according to the previous studies of saline lake water and seawater ,,− without using a further desalination approach.…”

Section: Methodsmentioning

confidence: 99%

“…Saline lakes typically contain high concentrations of dissolved organic carbon (DOC), which is often attributed to the evaporation–condensation effect. − DOC concentration may be greater in brine lakes (salinity >50) than in brackish lakes (0.5 < salinity < 30) because of the greater evaporation–condensation effect. Previous studies have also shown that saline lakes are usually terminal lakes, without any outflow except for evaporation; ,, thus, the limited outflow would cause long persistency and old age of DOC in saline lakes .…”

Section: Introductionmentioning

confidence: 99%

Dissolved Organic Matter Characteristics and Composition of Saline Lakes in the Badain Jaran Desert, China

Zhang,

Wang,

Zhang

et al. 2023

ACS Earth Space Chem.

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Elucidating the characteristics and molecular composition of dissolved organic matter (DOM) is critical to understanding carbon cycling in increasingly saline lakes in arid and hyperarid areas; however, the molecular signatures of DOM in these widely distributed saline lakes remain poorly understood. Here, variations in DOM characteristics and ages with salinity were investigated across 10 small saline lakes within the Badain Jaran Desert based on absorption and fluorescence spectroscopy, Fourier transform ion cyclotron resonance mass spectrometry, and 14 Cisotopic analysis. The results showed that dissolved organic carbon (DOC) significantly increased with salinity, and the 14 C age of solid-phase extracted DOM ranging 385−3935 years before present did not correlate with salinity across lakes. With increasing salinity, the DOM aromaticity, DOC-specific abundances of fluorescent components, and relative abundance of lignin-like components all decreased, whereas the relative abundance of lipid-like components increased. Regarding halogen-containing DOM, the brine lakes showed higher relative abundances of chlorine-containing lignin-and lipid-like components but comparable relative abundances of bromine-containing components, supporting preferential chlorination over bromination. This study demonstrates the strong impacts of salinization on DOM accumulation and chlorination in inland saline lakes and highlights the critical role of brine lakes as a persistent carbon pool.

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Redox conditions and Indicator of Reduction in Soils (IRIS) films in soils of a hypersaline wetland

Castañeda,

Rodríguez-Ochoa,

Olarieta

et al. 2024

CATENA

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Origin, accumulation and fate of dissolved organic matter in an extreme hypersaline shallow lake

Cited by 16 publications

References 63 publications

Hydrological Controls on Dissolved Organic Matter Composition throughout the Aquatic Continuum of the Watershed of Selin Co, the Largest Lake on the Tibetan Plateau

Hydrological Controls on Dissolved Organic Matter Composition throughout the Aquatic Continuum of the Watershed of Selin Co, the Largest Lake on the Tibetan Plateau

Dissolved Organic Matter Characteristics and Composition of Saline Lakes in the Badain Jaran Desert, China

Redox conditions and Indicator of Reduction in Soils (IRIS) films in soils of a hypersaline wetland

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