Increasing exposure to global climate change and hopes for the era of climate adaptation: An aquatic perspective

AMBIO, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 13, 2025

Language: Английский

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Catchments Amplify Reservoir Thermal Response to Climate Warming

Water Resources Research, Journal Year: 2025, Volume and Issue: 61(1)

Published: Jan. 1, 2025

Abstract Lentic waters integrate atmosphere and catchment processes, thus ultimately capture climate signals. However, studies of warming effects on lentic usually do not sufficiently account for a change in heat flux from the through altered inflow temperature discharge under change. This is particularly relevant reservoirs, which are highly impacted by hydrology may be affected upstream reservoirs or pre‐dams. study explicitly quantified how pre‐dams modify thermal response Rappbode Reservoir, Germany's largest drinking water reservoir system, to We established catchment‐lake modeling chain main its two utilizing lake model GOTM, mHM, stream Air2stream, forced an ensemble projections RCP2.6 8.5 scenarios. Results exhibited 0.27/0.15°C decade −1 surface/bottom temperatures reservoir, with approximately 8%/24% this attributed warming, respectively. The amplified deep more than at surface, contrary atmospheric effect, advanced stratification about 1 week, while having minor impact intensity. On other hand, reduced into spring, consequently lowered hypolimnetic postponed onset. shielded although overall contribution was minimal. Altogether, our highlights importance alterations seasonality when projecting provides insights catchment‐reservoir coupling

Language: Английский

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Methanogenesis rather than carbon dioxide production drives positive priming effects in anoxic sediments of saline lakes

Chemical Geology, Journal Year: 2025, Volume and Issue: unknown, P. 122680 - 122680

Published: Feb. 1, 2025

Language: Английский

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Increased Anoxia Promotes Organic Carbon Mineralization in Surface Sediments of Saline Lakes

Journal of Earth Science, Journal Year: 2025, Volume and Issue: unknown

Published: May 3, 2025

Language: Английский

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Quantifying Summer Internal Phosphorus Loading in Large Lakes across the United States

Environmental Science & Technology, Journal Year: 2025, Volume and Issue: unknown

Published: May 20, 2025

Internal phosphorus loading (IPL) can be a significant (P) source in freshwater systems, often causing water-quality improvement delays. Despite its importance, IPL estimates are missing for many systems due to several large-scale measuring and modeling challenges. In this study, we develop framework estimate summer anoxic sediment release rates (SRRs) P 5899 large lakes reservoirs (surface area > 1.0 km2; mixing depth < maximum depth) across the contiguous US (CONUS). Our combines random forest models bottom-water temperature (BT) surface-water total (TP) with mixed-effects regression model SRR, it includes uncertainty propagation these models. results indicate that mean SRR ranges from 1 37 mg/m2/day CONUS lakes, 31% of waterbodies having 10 mg/m2/day. Areas high generally associated predicted TP, which is particularly common agricultural areas. Uncertainties predictions largely attributable forest-based inputs predictive error regression. relatively dry summers, likely higher than external 26% watersheds. Overall, our reveal where critical factor watershed nutrient management.

Language: Английский

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Environmental and societal consequences of winter ice loss from lakes

Science, Journal Year: 2024, Volume and Issue: 386(6718)

Published: Oct. 10, 2024

Climate change is reducing winter ice cover on lakes; yet, the full societal and environmental consequences of this loss are poorly understood. The socioeconomic implications declining include diminished access to ice-based cultural activities, safety concerns in traversing ice, changes fisheries, increases shoreline erosion, declines water storage. Longer ice-free seasons allow more time capacity for warm, threatening quality biodiversity. Food webs likely will reorganize, with constrained availability ice-associated cold-water niches, affect nature, magnitude, timing greenhouse gas emissions. Examining these rapidly emerging generate more-complete models lake dynamics, transdisciplinary collaborations facilitate translation effective management sustainability.

Language: Английский

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Ecological memory of spring air temperature drives summer water quality dynamics in temperate lakes

Authorea (Authorea), Journal Year: 2024, Volume and Issue: unknown

Published: June 11, 2024

Scientific Significance StatementSummer bottom-water temperature and dissolved oxygen dynamics play a critical role in shaping water quality many temperate lakes. Counterintuitively, it is possible that spring air temperatures exert stronger influence on summer than temperatures—a phenomenon we refer to as "seasonal ecological memory." In our analysis of 615 lakes, found support for seasonal memory effect helps explain why trends diverge from temperature, thereby improving ability predict the effects climate change lake dynamics.

Language: Английский

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Rapid Eutrophication of a Clearwater Lake: Trends and Potential Causes Inferred From Phosphorus Mass Balance Analyses

Global Change Biology, Journal Year: 2024, Volume and Issue: 30(11)

Published: Nov. 1, 2024

ABSTRACT Many clearwater lakes increasingly show symptoms of eutrophication, but the underlying causes are largely unknown. We combined long‐term water chemistry data, multi‐year sediment trap measurements, analyses and simple mass balance models to elucidate potential eutrophication a deep temperate lake, where total phosphorus (TP) concentrations quadrupled within decade, accompanied by expanding hypolimnetic anoxia. Discrepancies between modeled empirically determined P inputs suggest that observed sharp rise in TP was driven internal processes. The magnitude seasonal variation greatly increased at same time, both surface water, partly decoupled from oxygen conditions. A positive correlation annual loss upper column accumulation could hint short‐circuited cycle involving lateral transport shallow‐water zones deposition release sediments water. This hypothesis is also supported budgets for 20 m during stable summer stratification, suggesting shallow lake areas acted as net source until 2018. These changes potentially related shifts submerged macrophytes wintergreen charophyte meadows ( Nitellopsis obtusa ) free‐floating hornwort Ceratophyllum demersum sulfide formation, promoting iron fixation sediments. Iron bound sulfur unavailable binding P, resulting feedback areas, primary productivity, macrophyte community structure redox‐dependent biogeochemistry. Overall, our results relationships more complex than commonly invoked increase under anoxic conditions can drive rapid eutrophication. Since proportion littoral typically large even stratified lakes, processes may contribute frequently trends around world currently recognized.

Language: Английский

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Reservoir drawdown highlights the emergent effects of water level change on reservoir physics, chemistry, and biology

Authorea (Authorea), Journal Year: 2024, Volume and Issue: unknown

Published: Feb. 12, 2024

Water level drawdowns are increasingly common in lakes and reservoirs worldwide as a result of both climate change water management. Drawdowns can have direct effects on physical properties waterbody (e.g., by altering stratification light dynamics), which interact to modify the waterbody’s biology chemistry. However, ecosystem-level drawdown remain poorly characterized small, thermally-stratified reservoirs, many regions world. Here, we intensively monitored small eutrophic reservoir for two years, including before, during, after month-long that reduced total volume 36%. During drawdown, strength (maximum buoyancy frequency) surface phosphate concentrations increased, contributing substantial phytoplankton bloom. The peak biomass was followed cascading changes chemistry associated with bloom degradation, sequential peaks dissolved organic carbon, carbon dioxide, ammonium were up an order magnitude higher than previous year. Dissolved oxygen substantially decreased waters during (to 41% saturation), increased iron manganese concentrations. Combined, our results illustrate how coupled physical, chemical, biological processes. As management continue increase frequency worldwide, highlight importance characterizing variability alter complex in-lake ecosystem processes, thereby affecting quality.

Language: Английский

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Water and sediment chemistry of shallow Amazonas lakes show alert signals

Authorea (Authorea), Journal Year: 2024, Volume and Issue: unknown

Published: July 31, 2024

Increasing droughts and related water losses challenge lake systems. We analyzed sediment samples from five lakes in subsequent dry rainy seasons to study lakes' vulnerability at times of significant environmental change, revisit the "old question" whether different tropical types can be observed more complex datasets better understand their limnological status, differences between types, broaden baseline database for research. High temperatures combined with reduced oxygen levels (<<80% saturation) impose challenging boundary conditions all biotas. Clearwater, black-, whitewater differentiated by signatures dissolved ions, organic carbon, selected major, minor trace elements sediment. Lake waters resembled remote rainwater. composition was compared that 'terra firme' soils surrounding catchments 47 chemical including carbon nitrogen, macro- micronutrients. With few exceptions (Ti; REE), element concentrations showed mostly depletion when upper continental crust, reflecting regional soil chemistry ongoing due deforestation changing landcover. Sediments act as intermediate sinks eroded materials show increasing buffer capacity clearwater < blackwater lakes. Under climate especially areas close equator, already pronounced will pose further challenges aquatic life. Lake, pisciculture, catchment management should adapted accordingly.

Language: Английский

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