Investigating Influence of Hydrological Regime on Organic Matters Characteristic in a Korean Watershed

Baek, Sang-Soo; Jeon, Junho; Lee, Hyuk; Park, Jong Kwan; Cho, Kyung

doi:10.3390/w11030512

Cited by 10 publications

(3 citation statements)

References 49 publications

(63 reference statements)

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“…The compositional differences and the characteristics of marine DOM are still largely unidentified because the very low concentrations of DOM in seawater, compared to the massive amounts of inorganic sea salts, present a major challenge (Hansell and Carlson, 2002;Park S. et al, 2019). Recently, high-resolution mass spectrometry (HRMS) has been applied to identify the molecular signatures of DOM (Koch et al, 2008;Phungsai et al, 2016;Baek et al, 2019). HRMS has far higher sensitivity and resolving power in identifying mass spectral peaks than the existing mass spectrometry (MS) methods (Koch et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Molecular-Level Chemical Characterization of Dissolved Organic Matter in the Ice Shelf Systems of King George Island, Antarctica

et al. 2020

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Antarctic shelf systems play an important role in organic matter circulation on Earth; hence, identifying the characteristics of dissolved organic matter (DOM) can be a good indicator for understanding its origin, as well as climate change. In this study, to identify the characteristics of DOM in the ice shelf systems, surface water was collected from the open sea (OS) and Marian cove (fjord, FJ). Although there were no differences in DOM characteristics between sampling sites in the quantitative analyses, the DOM in the surface water of each region seemed to be more affected by terrestrial than marine biological sources in optical and molecular properties. This finding indicates that the terrestrial DOM related to mosses based on the results of molecular properties: high levels of lipid-like (35-39%) and unsaturated hydrocarbon-like (UH; 27-34%) in both the OS and the FJ regions and significantly higher tannin-like substance and condensed aromatic structures in the FJ than in the OS region. When comparing the FJ transect samples, those nearest to a glacier (FJ1; 0.93 km from the glacier) showed relatively low salinity, high dissolved organic carbon, and high chromophoric DOM, indicating that terrestrial DOM (possibly produced by moss) inflow occurred with the runoff from the freshly melting land ice and glacier. However, no significant differences in molecular composition were detected, suggesting that terrestrial DOM is introduced into the ice shelf systems by melting land ice, and glacier runoff could be a major source of DOMrich seawater during austral fall when low marine biological activity occurs. This study has a great significance as background data for DOM characteristics in the ice shelf systems due to the enhanced biological activity during the austral summer.

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Section: Introductionmentioning

confidence: 99%

Molecular-Level Chemical Characterization of Dissolved Organic Matter in the Ice Shelf Systems of King George Island, Antarctica

et al. 2020

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“…Considering the pristine nature of the basin, this also may have measurable yet unknown consequences for the export of DOC and nutrients from soils to rivers, and ultimately for the fjord. Although most studies focus on temperate, boreal and artic regions, it is well known that changes in hydrological regimes influence the export of DOC in relatively undisturbed basins (Winterdahl et al, 2016;Baek et al, 2019;Connolly et al, 2020). Unfortunately, our shortterm study in terms of water chemistry cannot illuminate this issue, and there are no long-term records of organic matter and nutrient export from Patagonian basins to support claims related to changes in hydrological regimes.…”

Section: Figure 8 | (A)mentioning

confidence: 84%

Climate and Land Cover Trends Affecting Freshwater Inputs to a Fjord in Northwestern Patagonia

et al. 2021

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Freshwater inputs strongly influence oceanographic conditions in coastal systems of northwestern Patagonia (41–45°S). Nevertheless, the influence of freshwater on these systems has weakened in recent decades due to a marked decrease in precipitation. Here we evaluate potential influences of climate and land cover trends on the Puelo River (640 m3s–1), the main source of freshwater input of the Reloncaví Fjord (41.5°S). Water quality was analyzed along the Puelo River basin (six sampling points) and at the discharge site in the Reloncaví Fjord (1, 8, and 25 m depth), through six field campaigns carried out under contrasting streamflow scenarios. We also used several indicators of hydrological alteration, and cross-wavelet transform and coherence analyses to evaluate the association between the Puelo River streamflow and precipitation (1950–2019). Lastly, using the WEAP hydrological model, land cover maps (2001–2016) and burned area reconstructions (1985–2019), we simulated future land cover impacts (2030) on the hydrological processes of the Puelo River. Total Nitrogen and total phosphorus, dissolved carbon, and dissolved iron concentrations measured in the river were 3–15 times lower than those in the fjord. Multivariate analyses showed that streamflow drives the carbon composition in the river. High streamflow conditions contribute with humic and colored materials, while low streamflow conditions corresponded to higher arrival of protein-like materials from the basin. The Puelo River streamflow showed significant trends in magnitude (lower streamflow in summer and autumn), duration (minimum annual streamflow), timing (more floods in spring), and frequency (fewer prolonged floods). The land cover change (LCC) analysis indicated that more than 90% of the basin area maintained its land cover, and that the main changes were attributed to recent large wildfires. Considering these land cover trends, the hydrological simulations project a slight increase in the Puelo River streamflow mainly due to a decrease in evapotranspiration. According to previous simulations, these projections present a direction opposite to the trends forced by climate change. The combined effect of reduction in freshwater input to fiords and potential decline in water quality highlights the need for more robust data and robust analysis of the influence of climate and LCC on this river-fjord complex of northwestern Patagonia.

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“…The understanding of water quality or biologic processes should be based on source locality and pathway conditions. Baek et al 2019 [14] used an effective approach to find sources of DOM (dissolved organic matter) in rivers by coupling the SWAT (Soil and Water Assessment Tool) model with organic matter characterization and concluded that lateral flow transported hydrophobic and large-molecule organic matter after rainfall.…”

Section: Summary Of This Special Issuementioning

confidence: 99%

Hydrological Impact of Typhoon on Rivers

Huang

Lee

2021

Water

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Rivers link terrestrial and marine ecosystems, not only transporting numerous substances downstream but also shaping landscapes and fostering aquatic ecosystems through physical interactions and biogeochemical processes with numerous agents. On the other hand, hydraulic facilities, such as reservoirs, hydropower plants, and banks are deployed to utilize water resources for sustaining human society. In the river network systems, rainstorms, as episodic/periodic strong triggers, can induce mass wasting from hillslopes, accelerating nutrient transport, which causes sequential effects. In recent decades, global warming has been accelerating water cycling via thermodynamics, and thus, the frequency and intensity of extreme rainstorms are increasing in intensity. In the West Pacific, typhoons (alias tropical cyclones in Asia) characterized by strong wind and torrential rainfall are evidenced to be getting stronger. The intensified typhoons inevitably stimulate the response of river systems through sediment and nutrient transport and threaten the safe operation of the hydraulic facilities and even coastal communities through storm surge flooding. These strong impacts on river systems should be comprehensively explored. This issue aims to improve the understanding of typhoon effects in river systems. Inter- and cross-disciplinary studies on different watershed scales, linking ecosystem services and watershed management, are particularly addressed.

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Investigating Influence of Hydrological Regime on Organic Matters Characteristic in a Korean Watershed

Cited by 10 publications

References 49 publications

Molecular-Level Chemical Characterization of Dissolved Organic Matter in the Ice Shelf Systems of King George Island, Antarctica

Molecular-Level Chemical Characterization of Dissolved Organic Matter in the Ice Shelf Systems of King George Island, Antarctica

Climate and Land Cover Trends Affecting Freshwater Inputs to a Fjord in Northwestern Patagonia

Hydrological Impact of Typhoon on Rivers

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