Seasonal carbon dynamics of the Kolyma River tributaries, Siberia DOI Creative Commons
Kirsi Keskitalo, Lisa Bröder, Tommaso Tesi

et al.

Published: Aug. 23, 2023

Abstract. Arctic warming is causing permafrost thaw and release of organic carbon (OC) to fluvial systems. Permafrost-derived OC can be transported downstream degraded into greenhouse gases that may enhance climate warming. Susceptibility decomposition depends largely upon its source composition which varies throughout the seasonally distinct hydrograph. Most studies date have focused on larger rivers, yet little known about dynamics in lower order rivers/streams. Here, we characterize sources OC, focusing less studied particulate (POC), smaller waterways within Kolyma River watershed. Additionally, examine how watershed characteristics control concentrations. In systems, find rapid initiation primary production response warm weather, shown by decreasing δ13C-POC, contrast rivers. As hydrologic changes increase transfer from through river networks this intensify inland water outgassing.

Language: Английский

Burial or mineralization: Origins and fates of organic matter in the water–suspended particulate matter–sediment of macrophyte- and algae-dominated areas in Lake Taihu DOI
Cheng Liu, Qiushi Shen,

Xiaozhi Gu

et al.

Water Research, Journal Year: 2023, Volume and Issue: 243, P. 120414 - 120414

Published: July 25, 2023

Language: Английский

Citations

30
Global patterns of organic carbon transfer and accumulation across the land–ocean continuum constrained by radiocarbon data DOI Creative Commons
Chenglong Wang, Yifei Qiu, Zhe Hao

et al.

Nature Geoscience, Journal Year: 2024, Volume and Issue: 17(8), P. 778 - 786

Published: June 21, 2024

Abstract Radiocarbon (Δ 14 C) serves as an effective tracer for identifying the origin and cycling of carbon in aquatic ecosystems. Global patterns organic (OC) Δ C values riverine particles coastal sediments are essential understanding contemporary cycle, but poorly constrained due to under-sampling. This hinders our OC transfer accumulation across land–ocean continuum worldwide. Here, using machine learning approaches >3,800 observations, we construct a high-spatial resolution global atlas river–ocean continuums show that river corresponding can be similar or different. Specifically, four characteristic modes recognized: old–young mode systems with low high sediment values; young–old old–old old receiving values, respectively; young–young young both deposited particles. Distinguishing these their spatial is critical furthering system. among areas contents worldwide, largely neutral slightly negative atmospheric dioxide (CO 2 ) removal, whereas represent CO sources sinks, respectively. These content isotope composition constrain local potential blue solutions.

Language: Английский

Citations

5
Source identification of sedimentary organic carbon in coastal wetlands of the western Bohai Sea DOI

Juqin Zhang,

Qian Hao, Qiang Li

et al.

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 913, P. 169282 - 169282

Published: Dec. 21, 2023

Language: Английский

Citations

12
Selective Sorting and Degradation of Permafrost Organic Matter in the Nearshore Zone of Herschel Island (Yukon, Canada) DOI Creative Commons
Dirk Jong, Lisa Bröder, Tommaso Tesi

et al.

Journal of Geophysical Research Biogeosciences, Journal Year: 2024, Volume and Issue: 129(1)

Published: Jan. 1, 2024

Abstract Erosion of permafrost coasts due to climate warming releases large quantities organic carbon (OC) into the Arctic Ocean. While burial OC in marine sediments potentially limits degradation, resuspension nearshore zone enhances degradation and greenhouse gas production, adding “permafrost feedback.” Recent studies, focusing on bulk sediments, suggest that derived from coastal erosion is predominantly deposited close shore. However, approaches disregard sorting processes zone, which strongly influence distribution fate. We studied soils along a transect fast‐eroding shoreline Herschel Island— Qikiqtaruk (Yukon, Canada) depositional basin offshore. Sample material was fractionated by density (1.8 g cm −3 ) size (63 μm), separating loose mineral‐associated OC. Each fraction analyzed for element content (TOC, TN), isotopes (δ 13 C, Δ 14 C), molecular biomarkers ( n ‐alkanes, ‐alkanoic acids, lignin phenols, cutin acids), mineral surface area. The partitioning between fractions changes considerably transect, highlighting importance hydrodynamic zone. Additionally, biomarker loadings decrease land‐ocean indicating significant loss during transport. proxies show contrasting trends, suggesting losses are not always well reflected its state. This study, using crosses boundaries way done before, aids disentangle patterns, provides quantitative insight thawed eroded

Language: Английский

Citations

4
Catchment-based sampling of river eDNA integrates terrestrial and aquatic biodiversity of alpine landscapes DOI Creative Commons
Merin Reji Chacko, Florian Altermatt, Fabian Fopp

et al.

Oecologia, Journal Year: 2023, Volume and Issue: 202(4), P. 699 - 713

Published: Aug. 1, 2023

Monitoring of terrestrial and aquatic species assemblages at large spatial scales based on environmental DNA (eDNA) has the potential to enable evidence-based policymaking. The coverage eDNA-based studies varies substantially, ability eDNA metabarcoding capture regional biodiversity remains be assessed; thus, questions about best practices in sampling design entire landscapes remain open. We tested extent which can diversity a region with highly heterogeneous habitat patches across wide elevation gradient for five days through multiple hydrological catchments Swiss Alps. Using peristaltic pumps, we filtered 60 L water sites per catchment total volume 1800 L. an approach focusing vertebrates plants, detected 86 vertebrate taxa spanning 41 families 263 plant 79 ten catchments. For mammals, fishes, amphibians covered some most common according long-term records while including few more rare taxa. found marked turnover among samples from distinct elevational classes indicating that biological signal alpine rivers relatively localised is not aggregated downstream. Accordingly, compositions differed between correlated catchment-level forest grassland cover. Biomonitoring schemes capturing within biologically integrated may pave way toward spatially comprehensive estimation biodiversity.

Language: Английский

Citations

11
Rice Husk Based Bio-composites DOI
Yousaf Latif Khan, Abdul Sattar,

Syed Amin Ullah

et al.

Published: Jan. 1, 2025

Language: Английский

Citations

0
The land–ocean Arctic carbon cycle DOI Creative Commons
Jorien E. Vonk, Michael Fritz, Niek Jesse Speetjens

et al.

Nature Reviews Earth & Environment, Journal Year: 2025, Volume and Issue: 6(2), P. 86 - 105

Published: Feb. 1, 2025

Language: Английский

Citations

0
The arctic oscillation controls interannual transport and fate of particulate organic carbon on the Eurasian Arctic Shelf DOI

Jialong Luo,

Limin Hu,

Xiaoyu Wang

et al.

Progress In Oceanography, Journal Year: 2025, Volume and Issue: unknown, P. 103468 - 103468

Published: March 1, 2025

Language: Английский

Citations

0
Riverine Particulate Carbon, Nitrogen, and Phosphorus Are Decoupled From Land Cover at the Continental Scale DOI Creative Commons

Benjamin Trost,

Arial J. Shogren,

Zacharie T. Loveless

et al.

Global Biogeochemical Cycles, Journal Year: 2025, Volume and Issue: 39(3)

Published: March 1, 2025

Abstract While inland freshwater networks cover less than 4% of the Earth's terrestrial surface, these ecosystems play a disproportionately large role in global cycles [C]arbon, [N]itrogen, and [P]hosphorus, making streams rivers critical regulators nutrient balance at regional continental scales. Foundational studies have established relative importance hydrologic regime, land cover, instream removal processes for controlling transport processing C, N, P river networks. However, particulate can make up proportion total material during high flows. To constrain patterns biogeochemistry riverine particulates, we characterized modeled dissolved concentration variability scale using open‐access data from 27 National Ecological Observatory Network (NEON) sites across United States. We analyzed Boosted Regression Trees (BRTs) to statistically identify if characteristics could predict quantity quality stream particulates. The BRT models revealed that does not strongly dynamics NEON but indicate might be more important catchment alone. In addition, our study demonstrates consistent particulates forms, highlighting their likely significance biogeochemical along continuum.

Language: Английский

Citations

0
Coupled primary production and respiration in a large river contrasts with smaller rivers and streams DOI Creative Commons
Sarah S. Roley, Robert O. Hall, William Perkins

et al.

Limnology and Oceanography, Journal Year: 2023, Volume and Issue: 68(11), P. 2461 - 2475

Published: Oct. 3, 2023

Abstract Although time series in ecosystem metabolism are well characterized small and medium rivers, patterns the world's largest rivers almost unknown. Large present technical difficulties, including depth measurements, gas exchange (, ) estimates, presence of large dams, which can supersaturate gases. We estimated reach‐scale for Hanford Reach Columbia River (Washington state, USA), a free‐flowing stretch with an average discharge 3173 . calculated from semi‐empirical models directly it tracer measurements. fixed at median value these calculations (0.5 ), used maximum likelihood to estimate reach‐scale, open‐channel metabolism. Both gross primary production (GPP) respiration (ER) were high (GPP range: 0.3–30.8 g , ER 0.8–30.6 peak GPP occurring late summer or early fall. increased exponentially temperature, consistent metabolic theory, while light was seasonally saturating. Annual GPP, 1500 carbon top 2% estimates other rivers. tightly coupled 90% immediately respired, resulting net near 0. Patterns contrast those small‐medium suggesting that magnitudes may not be simply scaled knowledge smaller

Language: Английский

Citations

6