Riverine dissolved organic carbon and its optical properties in a permafrost region of the Upper Heihe River basin in the Northern Tibetan Plateau

Gao, Tanguang; Kang, Shichang; Chen, Rensheng; Zhang, Taigang; Zhang, Tingjun; Han, Chuntan; Sillanpää, Mika

doi:10.1016/j.scitotenv.2019.05.478

Cited by 28 publications

(14 citation statements)

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“…In winter, the temperature drops sharply, and the lower soil temperature limits the release of DOC (Gao et al, 2019). In addition, the reduced thickness of the active layer also reduces the connectivity between deep soil water and adjacent surface water (Striegl, Aiken, Dornblaser, Raymond, & Wickland, 2005).…”

Section: Discussionmentioning

confidence: 99%

“…Groundwater is often developed in seasonal permafrost. The cross‐distribution of bedrock, residual slope, and alluvial layer under the control of microtopography makes the conversion of surface water to groundwater and different layers more frequent in this area (Gao et al, 2019; Wang, Sun, Yalu, Mengyan, & Chang, 2017). Because of the high surface‐temperature, permafrost is sensitive to global warming.…”

Section: Discussionmentioning

confidence: 99%

“…DOC is an important part of the food web of aquatic ecosystems and is a source of energy for many organisms (Gao et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…The concentration and transport of DOC are essential aspects of the global carbon cycle (Raymond & Bauer, 2001). DOC is an important part of the food web of aquatic ecosystems and is a source of energy for many organisms (Gao et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

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Dissolved organic carbon transport in the Qilian mountainous areas of China

Zhu

Wan

Yong

et al. 2020

Hydrological Processes

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The Dissolved Organic Carbon (DOC) content of rivers is the most significant part of the carbon cycle migration in the basin under consideration, and it is the basis for a comprehensive understanding of the regional carbon cycle. In this study, we periodically collected samples from four monitoring stations in the Xiying River Basin of the Qilian Mountains in the northern Qinghai-Tibet Plateau. We calculated the fluxes of organic carbon in the rivers within the study area and have discussed the influencing factors of DOC concentration in these rivers. The results showed that: (a) The DOC concentration and transport flux of the Xiying river showed significant seasonal changes. The DOC concentration during summer and autumn was higher than that in winter and spring, and the output flux in summer and autumn accounted for approximately 88.3% of the total annual output. (b) Precipitation runoff has a higher DOC concentration than meltwater runoff. Climate factors, river-water chemical characteristics, and seasonal frozen-soil changes in the river basin have significant effects on the river DOC concentration and transport flux. (c) Larger runoff causes higher DOC concentrations in rivers. Runoff is the primary means of carbon migration in the inland river basin. Carbon migration is significant from the upstream to the middle and downstream sections of the inland river basin.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…DOC is an important part of the food web of aquatic ecosystems and is a source of energy for many organisms (Gao et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dissolved organic carbon transport in the Qilian mountainous areas of China

Zhu

Wan

Yong

et al. 2020

Hydrological Processes

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“…DIC was the dominant form of dissolved riverine carbon with a higher concentration in the monsoon (30.7 ± 2.3 mg L −1 ) than premonsoon season (25.3 ± 1.9 mg L −1 ; Figure S1a). DIC accounted for at least 87% of the total riverine carbon (including particulate carbon), which is generally higher than tropical (~40%; Huang et al, 2012) and Arctic rivers (52-70%; Prokushkin et al, 2011;Guo et al, 2012) but similar to rivers sourced from the Qinghai-Tibetan Plateau including the upper Yangtze River, Yellow River and their tributaries (Cai et al, 2008;Gao et al, 2019;Song et al, 2019;Song et al, 2020). The large proportion of DIC in riverine carbon partly reflects the high chemical weathering rate on the Qinghai-Tibetan Plateau evidenced by the high riverine Ca 2+ and Mg 2+ concentrations (Zhang et al, 2013) and their positive correlations with DIC (p < 0.05; Figure S1b).…”

Section: Riverine Carbon Fluxes In the Shaliu Rivermentioning

confidence: 99%

Spatial-temporal variations in riverine carbon strongly influenced by local hydrological events in an alpine headwater stream

Wang¹,

Liu²,

Wang³

et al. 2020

Preprint

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Abstract. Headwater streams drain > 70 % of global land areas but are poorly monitored compared with large rivers. The small size and low water buffering capacity of headwater streams may result in a high sensitivity to local hydrological alterations and divergent carbon transport dynamics relative to large rivers. To assess these aspects, here we carry out a benchmark investigation on the riverine carbon dynamics in a typical alpine headwater stream (Shaliu River) on the Qinghai-Tibetan Plateau based on annual flux monitoring, in-depth seasonal sampling and hydrological event monitoring. We show that riverine carbon in the Shaliu River was dominated by dissolved inorganic carbon, peaking in the summer due to high discharge brought by the monsoon. Combining seasonal sampling along the river and monitoring of soil-river carbon transfer during spring thaw, we also show that both dissolved and particulate forms of riverine carbon increased downstream in the pre-monsoon season due to increasing contribution of organic matter derived from thawed permafrost along the river. By comparison, riverine carbon fluctuated in the summer, likely associated with sporadic inputs of organic matter supplied by local precipitation events during the monsoon season. Furthermore, using lignin phenol analysis for both riverine organic matter and soils in the basin, we show that the higher acid-to-aldehyde (Ad / Al) ratios of riverine lignin in the monsoon season reflect a larger contribution of topsoil likely via increased surface runoff compared with the pre-monsoon season when soil leachate lignin Ad / Al ratios were closer to those in the subsoil than topsoil solutions. Overall, these findings highlight the unique patterns and strong links of carbon dynamics in alpine headwater streams with local hydrological events. Given the projected climate warming on the Qinghai-Tibetan Plateau, thawing of seasonal permafrost and alterations of precipitation regimes may significantly influence the alpine headwater carbon dynamics, with cascading effects on the biogeochemical cycles of the watersheds. The alpine headwater streams may also be utilized as sentinels for climate-induced changes in the hydrological pathways and/or biogeochemistry of the small basin.

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