River ecosystem metabolism and carbon biogeochemistry in a changing world

Nature, Journal Year: 2023, Volume and Issue: 613(7944), P. 449 - 459

Published: Jan. 18, 2023

Language: Английский

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Warming-driven erosion and sediment transport in cold regions

Nature Reviews Earth & Environment, Journal Year: 2022, Volume and Issue: 3(12), P. 832 - 851

Published: Nov. 1, 2022

Language: Английский

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Widespread retreat of coastal habitat is likely at warming levels above 1.5 °C

Nature, Journal Year: 2023, Volume and Issue: 621(7977), P. 112 - 119

Published: Aug. 30, 2023

Abstract Several coastal ecosystems—most notably mangroves and tidal marshes—exhibit biogenic feedbacks that are facilitating adjustment to relative sea-level rise (RSLR), including the sequestration of carbon trapping mineral sediment 1 . The stability reef-top habitats under RSLR is similarly linked reef-derived accumulation vertical accretion protective coral reefs 2 persistence these ecosystems high rates contested 3 Here we show probability inferred from palaeo-stratigraphic observations aligns with contemporary in situ survey measurements. A deficit between marsh mangrove likely at 4 mm yr −1 highly 7 RSLR. As exceed , reef islands destabilize through increased shoreline erosion wave over-topping increases. Increased global warming 1.5 °C 2.0 would double area mapped exposed by 2080 2100. With warming, nearly all world’s forests almost 40% marshes estimated be least Meeting Paris agreement targets minimize disruption ecosystems.

Language: Английский

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Response of streamflow and sediment variability to cascade dam development and climate change in the Sai Gon Dong Nai River basin

Climate Dynamics, Journal Year: 2024, Volume and Issue: 62(8), P. 7997 - 8017

Published: July 5, 2024

Language: Английский

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Global Observations of Riverbank Erosion and Accretion From Landsat Imagery

Journal of Geophysical Research Earth Surface, Journal Year: 2023, Volume and Issue: 128(2)

Published: Jan. 31, 2023

Abstract Riverbank migration has historically been seen as a risk to infrastructure that can be combated through channelization, bank stabilization, and sediment trapping. The physical processes involved with riverbank erosion deposition are well defined, yet the solutions equations describe these computationally data intensive over large domains. While current understanding of large‐scale river channel mobility largely comes from reach‐ watershed‐scale observations, we need global observations accretion broaden our within across basins. In this work, create first set for >370,000 km rivers using up 20 years water classifications Landsat imagery. We estimate uncertainty by propagating classification errors methods. Globally, find wider than 150 m have an approximately log‐normal distribution median value 1.52 m/yr. Comparing 25 similar estimates migration, found normalized mean absolute error 42% bias 5.8%. show width is best first‐order predictor erosion, in agreement existing literature. also relationship between substantially different among sample basins suggest due second‐order influences geology, hydrology, human influence. These will help improve models transport, support modification rivers.

Language: Английский

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Recent intensified erosion and massive sediment deposition in Tibetan Plateau rivers

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: Jan. 24, 2024

Recent climate change has caused an increase in warming-driven erosion and sediment transport processes on the Tibetan Plateau (TP). Yet a lack of measurements hinders our understanding basin-scale dynamics associated spatiotemporal changes. Here, using satellite-based estimates suspended sediment, we reconstruct quantitative history patterns major headwater basins from 1986 to 2021. Out 13 warming-affected regions, 63% rivers have experienced significant increases flux. Despite such intensified erosion, find that 30% total flux been temporarily deposited within rivers. Our findings reveal pronounced heterogeneity across basins. The recurrent fluctuations erosion-deposition river channels not only result underestimation magnitude but also drive continuous transformations valley morphology, thereby endangering local ecosystems, landscape stability, infrastructure project safety.

Language: Английский

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Hydropower impacts on riverine biodiversity

Nature Reviews Earth & Environment, Journal Year: 2024, Volume and Issue: 5(11), P. 755 - 772

Published: Oct. 14, 2024

Language: Английский

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Dams for hydropower and irrigation: Trends, challenges, and alternatives

Renewable and Sustainable Energy Reviews, Journal Year: 2024, Volume and Issue: 199, P. 114439 - 114439

Published: May 13, 2024

Hydropower and irrigation are essential for achieving human development objectives climate mitigation adaptation. These sectors depend on the same grey infrastructure, such as dammed reservoirs, which has created negative socio-ecological externalities sectoral conflicts in past. Yet, future needs infrastructure both their interdependencies remain unclear. We address this gap by applying data-fusion machine-learning approaches provide a comprehensive global overview new dataset that elucidates role of existing dams reservoirs hydropower irrigation. then review projected demands storage 2050 analyze how growth aligns with identified potential dams. Globally, projections point to an increased demand order 400 GW 2050, amounts around 60 %–64 % +35 compared today. For irrigation, fully leveraging sustainable water resources would require 460 km3/yr stored water, or +70 Projected larger than what could many regions, especially Europe, South Asia, Africa. In conditions, will be increasingly competition infrastructure. Our findings also highlight need study alternative solutions, other forms renewable energy nature-based solutions storage, meet societal while avoiding associated

Language: Английский

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Sustained increase in suspended sediments near global river deltas over the past two decades

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: April 18, 2024

River sediments play a critical role in sustaining deltaic wetlands. Therefore, concerns are raised about wetlands' fate due to the decline of river sediment supply many deltas. However, dynamics and drivers suspended near coasts not comprehensively assessed, its response changes remains unclear. Here we examine patterns coastal concentration (SSC) plume area (RPA) for 349 deltas worldwide using satellite images from 2000 2020. We find global increase SSC RPA, averaging +0.46% +0.48% yr

Language: Английский

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Anthropogenic impacts on mud and organic carbon cycling

Nature Geoscience, Journal Year: 2024, Volume and Issue: 17(4), P. 287 - 297

Published: April 1, 2024

Language: Английский

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