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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Catchment concentration–discharge relationships across temporal scales: A review

Wiley Interdisciplinary Reviews Water, Journal Year: 2023, Volume and Issue: 11(2)

Published: Dec. 7, 2023

Abstract Processes that drive variability in catchment solute sourcing, transformation, and transport can be investigated using concentration–discharge (C–Q) relationships. These relationships reflect in‐stream processes operating across nested temporal scales, incorporating both short long‐term patterns. Scientists therefore leverage catchment‐scale C–Q datasets to identify distinguish among the underlying meteorological, biological, geological export patterns from catchments influence shape of their respective We have synthesized current knowledge regarding geological, meteorological on for various types diel decadal time scales. cross‐scale linkages tools researchers use explore these interactions Finally, we gaps our understanding dynamics as reflections processes. also lay foundation developing an integrated approach investigate relationships, reflecting biogeochemical effects environmental change water quality. This article is categorized under: Science Water > Hydrological Quality Environmental Change

Language: Английский

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High Dissolved Carbon Concentration in Arid Rocky Mountain Streams

Environmental Science & Technology, Journal Year: 2023, Volume and Issue: 57(11), P. 4656 - 4667

Published: March 10, 2023

Warming in mountains is known to intensify aridity and threaten water availability globally. Its impacts on quality, however, have remained poorly understood. Here we collate long-term (multi-year decadal mean), baseline stream concentrations fluxes of dissolved organic inorganic carbon, two essential indicators quality soil carbon response warming, across more than 100 streams the United States Rocky Mountains. Results show a universal pattern higher mean arid mountain with lower discharge, climate measure. A watershed reactor model revealed less lateral export (via flow) out watersheds sites, leading accumulation concentrations. Lower typically occur cold, steep, compact snow fraction vegetation cover, which generally discharge fluxes. Inferring from space-for-time perspective, results indicate that as warming intensifies, will decrease but increase these streams. This indicates deteriorating potentially elevated CO2 emission directly land (instead streams) Rockies other areas future climate.

Language: Английский

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Linking Dynamic Water Storage and Subsurface Geochemical Structure Using High‐Frequency Concentration‐Discharge Records

Water Resources Research, Journal Year: 2024, Volume and Issue: 60(1)

Published: Jan. 1, 2024

Abstract Shifts in water fluxes and chemical heterogeneity through catchments combine to dictate stream solute export from the Critical Zone. The ways which these factors emerge resultant concentration‐discharge ( C‐Q ) relationships remain obscure, particularly at timescale of individual precipitation discharge events. Here we take advantage a new high‐frequency, multi‐element multi‐event data set. concentrations seven major ions were recorded every 40 min over five flood events spanning one hydrologic year French agricultural watershed (Orgeval) using lab‐in‐the‐field deployment refer as “River Lab.” We focus attention on recession periods consider how geochemical within catchment translates into dynamic during shifts storage. first show that for resulting acquisition multiple events, lumping all trends together can lead biases characteristic parameters. then reframe simple curve analysis hydrological processes produce mixing distinct pools immediately following find three classes behavior among solutes, none be interpreted based storage changes alone. shape each related their vertical zonation subsurface Orgeval, capacity subcomponents distributions readily mobilized event.

Language: Английский

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Water‐rock interactions drive chemostasis

Hydrological Processes, Journal Year: 2024, Volume and Issue: 38(2)

Published: Feb. 1, 2024

Abstract The western U.S. is experiencing shifts in recharge due to climate change, and it currently unclear how hydrologic will impact geochemical weathering stream concentration–discharge ( C – Q ) patterns. Hydrologists often use analyses assess feedbacks between discharge geochemistry, given abundant chemistry data. Chemostasis commonly observed, indicating that controls, rather than changes discharge, are shaping However, few studies investigate reactions evolve along groundwater flowpaths before contributes streamflow, resulting potential omission of important controls such as coupled mineral dissolution clay precipitation subsequent cation exchange. Here, we field observations—including age, chemistry—to analyse relations the Manitou Experimental Forest Colorado Front Range, USA, a site where chemostasis observed. We combine data with laboratory whole rock x‐ray diffraction soil cation‐extraction experiments role clays play influencing chemistry. Geochemist's Workbench identify driving subsequently suggest change trends. show age increases, slope solute response not impacted. Instead, primary drive strong for silica aluminium enable exchange buffers calcium magnesium concentrations, leading weak chemostatic behaviour divalent cations. influence on highlights importance delineating flowpaths, upgradient downgradient Our results be impacted by future decreasing flows, thus exists, continue persist despite recharge.

Language: Английский

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Exploring the Complex Effects of Wildfire on Stream Water Chemistry: Insights From Concentration‐Discharge Relationships

Water Resources Research, Journal Year: 2024, Volume and Issue: 60(2)

Published: Feb. 1, 2024

Abstract Wildfires are a worldwide disturbance with unclear implications for stream water quality. We examined chemistry responses immediately (<1 month) following wildfire by measuring over 40 constituents in four gauged coastal watersheds that burned at low to moderate severity. Three of the also had pre‐fire concentration‐discharge data 14 constituents: suspended sediment (SS fine ), dissolved organic and inorganic carbon (DOC, DIC), specific UV absorbance (SUVA), major ions (Ca 2+ , K + Mg Na Cl − F select trace elements (total Mn, Fe). In all watersheds, post‐fire concentrations SS DOC, Ca changed when compared data. Post‐fire changes DIC, SUVA, total Fe were found least two three streams. For detectable wildfire, slopes relationships commonly resulted stronger enrichment trends or weaker dilution trends, suggesting new contributing sources surficial near surface. However, few geogenic solutes, displayed nearly sites post‐fire. Moreover, fire‐induced constituent concentration highly discharge site‐dependent. These similarities differences across‐site emphasize need deeper understanding landscape‐scale solute pathways. Our findings highlight importance being explicit about reference points both assessment changes.

Language: Английский

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High-intensity rainfall following drought triggers extreme nutrient concentrations in a small agricultural catchment

Water Research, Journal Year: 2024, Volume and Issue: 264, P. 122108 - 122108

Published: July 25, 2024

The profound influence of climate change on the hydrological cycle raises concerns about its potential impacts water quality, particularly in agricultural catchments. Here, we analysed 200 storm events monitored for nitrate and total phosphorus (TP) at sub-hourly intervals from 2016 to 2023 Kervidy-Naizin catchment (north-western France). Using Extreme Value theory, identified with extreme concentrations compared their hydroclimatic characteristics those non-extreme events. We hypothesised that concentration occurred under conditions, which are projected become more frequent future. showed dilution patterns nitrate, decreasing by up 41 %, accretion TP, increasing 1400 % Hydroclimatic conditions during were characterised high rainfall intensities low antecedent discharge, but no particular mean discharge. During events, concentration-discharge relationships exhibited primarily clockwise hysteresis, whereas TP displayed an equal mix anticlockwise loops. In contrast, hysteresis weak TP. interpreted these dynamics controls as result infiltration-excess overland flow diluting nitrate-rich groundwater exporting large amounts intensive following droughts, while fluctuations riparian zone streambed remobilization control nutrient exports Given frequency intensity extremes, such retrospective analyses can provide valuable insights into future streams draining

Language: Английский

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Hydrologic Connectivity Regulates Riverine N₂O Sources and Dynamics

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(22), P. 9701 - 9713

Published: May 23, 2024

Indirect nitrous oxide (N2O) emissions from streams and rivers are a poorly constrained term in the global N2O budget. Current models of riverine place strong focus on denitrification groundwater environments as dominant source N2O, but do not explicitly consider direct input terrestrial ecosystems. Here, we combine isotope measurements spatial stream network modeling to show that terrestrial–aquatic interactions, driven by changing hydrologic connectivity, control sources dynamics mesoscale river within U.S. Corn Belt. We find produced nitrification constituted substantial fraction (i.e., >30%) across entire network. The delivery soil-produced was identified key mechanism for high contribution potentially accounted more than 40% total emission. This revealed large implies an important climate–N2O feedback may enhance under wetter warmer climate. Inadequate representation connectivity observations result significant underestimations.

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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Effects of 66 years of water management and hydroclimatic change on the urban hydrology and water quality of the Panke catchment, Berlin, Germany

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 900, P. 165764 - 165764

Published: July 27, 2023

Language: Английский

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