River water quality shaped by land–river connectivity in a changing climate

Nature Climate Change, Journal Year: 2024, Volume and Issue: 14(3), P. 225 - 237

Published: March 1, 2024

Language: Английский

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Deep learning for water quality

Nature Water, Journal Year: 2024, Volume and Issue: 2(3), P. 228 - 241

Published: March 12, 2024

Language: Английский

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Escalating Carbon Export from High-Elevation Rivers in a Warming Climate

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(16), P. 7032 - 7044

Published: April 11, 2024

High-elevation mountains have experienced disproportionately rapid warming, yet the effect of warming on lateral export terrestrial carbon to rivers remains poorly explored and understood in these regions. Here, we present a long-term data set dissolved inorganic (DIC) more detailed, short-term DIC, δ13CDIC, organic from two major Qinghai–Tibetan Plateau, Jinsha River (JSR) Yalong (YLR). In higher-elevation JSR with ∼51% continuous permafrost coverage, (>3 °C) increasing precipitation coincided substantially increased DIC concentrations by 35% fluxes 110%. lower-elevation YLR ∼14% permafrost, such increases did not occur despite comparable extent warming. Riverine particulate discharge (mobilization) both rivers. JSR, transitioned dilution (decreasing concentration discharge) earlier, colder years chemostasis (relatively constant concentration) later, warmer years. This changing pattern, together lighter δ13CDIC under high discharge, suggests that thawing boosts production via enhancing soil respiration weathering. These findings reveal predominant role altering escalating modifying patterns.

Language: Английский

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Enhanced Role of Streamflow Processes in the Evolutionary Trends of Dissolved Organic Carbon

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(10), P. 4772 - 4780

Published: Feb. 29, 2024

Investigating dissolved organic carbon (DOC) dynamics and drivers in rivers enhances the understanding of carbon–environment linkages support sustainability. Previous studies did not fully consider dynamic nature key that influence long-term changing trends DOC concentration over time (the controlling factors their roles trend can undergo alterations time). We analyzed 42 years (1979–2018) hydrometeorology, sulfate SO4, data from a 5.42 km2 watershed central-southern Ontario, Canada. Our findings reveal significant (p ≤ 0.01) overall increase concentrations, mainly due to coevolution SO4 streamflow trends, especially extreme flows. Over 42-year period, (especially high or low flows) have significantly < 0.05) intensified on increasing by an average 30%. Conversely, impact has weakened, experiencing decrease 32.6%. The upward annual is attributed number maximum flow days within year, while decreasing minimum contrasting effect. In other words, changes counteracting effect trends. These results underscore importance considering effects altered processes cycle under evolving environmental conditions.

Language: Английский

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Illuminating the “Invisible”: Substantial Deep Respiration and Lateral Export of Dissolved Carbon From Beneath Soil

Water Resources Research, Journal Year: 2024, Volume and Issue: 60(6)

Published: June 1, 2024

Abstract Dissolved organic and inorganic carbon (DOC DIC) influence water quality, ecosystem health, cycling. species are produced by biogeochemical reactions laterally exported to streams via distinct shallow deep subsurface flow paths. These processes arduous measure challenge the quantification of global cycles. Here we ask: when, where, how much is dissolved in from streams? We used a catchment‐scale reactive transport model, BioRT‐HBV, with hydrometeorology stream data illuminate “invisible” at Sleepers River, carbonate‐based catchment Vermont, United States. Results depict conceptual model where DOC mostly soils (3.7 ± 0.6 g/m 2 /yr) summer peak root microbial respiration. flushed (1.0 0.2 especially during snowmelt storms. A large fraction (2.5 percolates deeper subsurface, fueling respiration generate DIC. DIC predominantly (7.1 0.4 /yr, compared 1.3 0.3 /yr soils). Deep reduces increases concentrations depth, leading commonly observed flushing (increasing discharge) dilution patterns (decreasing discharge). Surprisingly, more than weathering this catchment. findings underscore importance vertical connectivity between highlighting overlooked role processing export.

Language: Английский

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Hydrologic Regime Determines Catchment‐Scale Dissolved Carbon Export Patterns

Water Resources Research, Journal Year: 2025, Volume and Issue: 61(3)

Published: March 1, 2025

Abstract Hydrologic regimes are affecting terrestrial carbon transformation, chemical weathering and lateral transport. However, its impacts on dissolved export patterns remains elusive. In this study, we collected a 2‐year high‐frequency inorganic (DIC) organic (DOC) dataset, namely wet year (Rainfall = 1,158 mm) dry 603 mm). The results showed that drought led to significant decrease in concentration discharge during the monitoring period. During non‐storm periods, DIC DOC shifted from dilution chemostatic enrichment years, respectively. were reversed storm periods. dominated by chemostatic, respectively, while both year. Structural equation models revealed aridity index temperature may affect patterns. We further classified events into three major types conceptualized catchment‐scale transport mechanisms for carbon. Dry‐AMCs result behavior, whereas Wet‐AMCs behavior due increased hydrological connectivity. third type corresponds extreme events, where larger overland flow often but behavior. These findings reveal predominant role of altering decreasing concentrations fluxes modifying

Language: Английский

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Hydrology Outweighs Temperature in Driving Production and Export of Dissolved Carbon in a Snowy Mountain Catchment

Water Resources Research, Journal Year: 2024, Volume and Issue: 60(7)

Published: July 1, 2024

Abstract Terrestrial production and export of dissolved organic inorganic carbon (DOC DIC) to streams depends on water flow biogeochemical processes in beneath soils. Yet, understanding these a rapidly changing climate is limited. Using the watershed‐scale reactive‐transport model BioRT‐HBV stream data from snow‐dominated catchment Rockies, we show deeper groundwater averaged about 20% annual discharge, rising ∼35% drier years. DOC DIC peaked during snowmelt wet years, driven more by hydrology than temperature. was primarily produced shallow soils (1.94 ± 1.45 gC/m 2 /year), stored via sorption, flushed out snowmelt. Some recharged further consumed subsurface respiration (−0.27 0.02 therefore reducing concentrations at low discharge. Consequently, exported zone (1.62 0.96 /year, compared 0.12 /year zone). both zones but higher rates (1.34 1.00 /year) deep (0.36 /year). Deep elevated In other words, responsible for commonly‐observed increasing (flushing) decreasing (dilution) with ~66% can drop ∼53% Numerical experiments suggest lower warmer, future, proportion processes. These results underscore often‐overlooked growing importance warming climate.

Language: Английский

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Oxidative Dissolution of Sulfide Minerals in Porous Media Under Evaporative Conditions: Multiphase Experiments and Process‐Based Modeling

Water Resources Research, Journal Year: 2024, Volume and Issue: 61(1)

Published: Dec. 26, 2024

Abstract The dissolution of sulfide minerals in subsurface porous media has important environmental implications. We investigate the oxidative pyrite under evaporative conditions and advance a mechanistic understanding interactions between multiple physical processes mineral/surface reactions. performed set experiments which initially water saturated anoxic soil columns, containing top layer pyrite, are exposed to atmosphere no evaporation (single‐phase) natural (two‐phase) conditions. was monitored by non‐invasive high‐resolution measurements oxygen pH. Additionally, we developed applied multiphase multicomponent reactive transport model quantitatively describe experimental outcomes elucidate interplay physico‐chemical mechanisms controlling extent dissolution. results confirm that single‐phase constrained slow diffusive liquid phase. In contrast, during evaporation, evolution fluid phases interphase mass transfer imposed distinct constraints on dynamics oxidation. Initially, invasion gaseous phase led fast delivery high concentrations zone thus markedly increased oxidation acidity/sulfate production. However, such enhanced release reaction products progressively limited over time as drying prevailed inhibited transient displacement also found control distribution aqueous species formation secondary creating spatio‐temporally variable redox

Language: Английский

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The influence of burn severity on dissolved organic carbon concentrations across a stream network differs based on seasonal wetness conditions

Biogeosciences, Journal Year: 2024, Volume and Issue: 21(13), P. 3093 - 3120

Published: July 2, 2024

Abstract. Large, high-severity wildfires in many regions across the globe have increased concerns about their impacts on carbon cycling watersheds. Altered sources of and changes catchment hydrology after wildfire can lead to shifts dissolved organic (DOC) concentrations streams, which negative aquatic ecosystem health downstream drinking-water treatment. Despite its importance, post-fire DOC responses remain relatively unconstrained literature, we lack critical knowledge how burn severity, landscape elements, climate interact affect concentrations. To improve our understanding impact severity concentrations, measured at 129 sites a stream network extending upstream, within, large, Oregon, USA. We collected samples study sub-basin during four distinct seasonal wetness conditions. used high-spatial-resolution data develop spatial (SSN) models predict controls Spatially, found no obvious signal – instead, observed pattern increasing from high-elevation headwaters outlet, while mainstem maintained consistently low This suggests that effects large may be “averaged” out higher orders larger scales. When grouped by group, significant decrease variability moderate high sub-catchments. However, SSN were able decreases with increases network. Decreases also highly variable conditions, greatest (−1.40 −1.64 mg L−1) occurring group wetting season. Additionally, indicated all seasons, baseflow index was more influential predicting than was, indicating groundwater discharge obscure Overall, results suggested characteristics regulate response wildfire. Moreover, timing sampling influence

Language: Английский

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Emerging investigator series: predicted losses of sulfur and selenium in european soils using machine learning: a call for prudent model interrogation and selection

Environmental Science Processes & Impacts, Journal Year: 2024, Volume and Issue: 26(9), P. 1503 - 1515

Published: Jan. 1, 2024

Changes in soil organic carbon, evapotranspiration, and S Se atmospheric deposition are predicted to decrease concentrations Europe soils.

Language: Английский

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