Atypical Seasonality of the Silicon Cycle in the Yellow River Estuary and Bohai Sea Revealed by Stable Silicon Isotopes DOI Creative Commons

Quanchao Cui,

Xiaowen Liu,

Zhenyan Wang

et al.

Global Biogeochemical Cycles, Journal Year: 2024, Volume and Issue: 38(3)

Published: March 1, 2024

Abstract Biogeochemical Si cycle in coastal areas is of vital importance due to its close link with the carbon cycle. However, has been heavily perturbated by human activities. In this study, we studied spatiotemporal distribution biogenic (BSi) and dissolved (DSi) combined stable isotopes DSi (δ 30 ) Yellow River estuary Bohai Sea, one most populated world. Over an annual cycle, BSi concentrations varied from 0 43.5 μmol L −1 0.3 40 , respectively. This was associated large δ variations +0.49 ± 0.22‰ (2sd) spring +2.92 0.14‰ winter, which opposed observations that summer values were usually higher than those winter. atypical variation could be attributed water‐sediment regulation on occurring every early summer, leading a strong water mixing pattern suppressing diatom production summer. further prolonged extreme autumn rainfall land. The pulse supply nutrients subsequently enhanced primary productivity through spring, resuspended seafloor sediments likely important source <−0.5‰. Our findings suggest natural seasonality greatly masked activities climate events Sea. study serves as reference research endeavors worldwide for revealing overlaying effect anthropogenic consequences variability.

Language: Английский

The Eurasian Arctic Ocean along the MOSAiC drift in 2019–2020: An interdisciplinary perspective on physical properties and processes DOI Creative Commons
Kirstin Schulz, Zoé Koenig, Morven Muilwijk

et al.

Elementa Science of the Anthropocene, Journal Year: 2024, Volume and Issue: 12(1)

Published: Jan. 1, 2024

The Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC, 2019–2020), a year-long drift with sea ice, has provided scientific community an unprecedented, multidisciplinary dataset from Eurasian Ocean, covering high atmosphere to deep ocean across all seasons. However, heterogeneity data and superposition spatial temporal variability, intrinsic campaign, complicate interpretation observations. In this study, we have compiled quality-controlled physical hydrographic best spatio-temporal coverage derived core parameters, including mixed layer depth, heat fluxes over key layers, friction velocity. We provide comprehensive accessible overview conditions encountered along MOSAiC drift, discuss their interdisciplinary implications, compare common climatologies these new data. Our results indicate that, most part, variability was dominated by regional rather than seasonal signals, carrying potentially strong implications biogeochemistry, ecology, even atmospheric conditions. Near-surface properties were strongly influenced relative position sampling, within or outside river-water Transpolar Drift, warming meltwater input. Ventilation down Atlantic Water in Nansen Basin allowed stronger connectivity between subsurface ice surface via elevated upward fluxes. Yermak Plateau Fram Strait regions characterized heterogeneous water mass distributions, energetic currents, lateral gradients frontal regions. Together presented offer context research, fostering improved understanding complex, coupled System.

Language: Английский

Citations

6
The Eurasian Arctic Ocean along the MOSAiC drift in 2019-2020: An interdisciplinary perspective on physical properties and processes DOI Creative Commons
Kirstin Schulz, Zoé Koenig, Morven Muilwijk

et al.

EarthArXiv (California Digital Library), Journal Year: 2023, Volume and Issue: unknown

Published: Sept. 7, 2023

The Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC, 2019--2020), a year-long drift with sea ice, has provided scientific community an unprecedented, multidisciplinary dataset from Eurasian Ocean, covering high atmosphere to deep ocean across all seasons. However, heterogeneity data and superposition spatial temporal variability, intrinsic campaign, complicate interpretation observations. In this study, we have compiled quality-controlled physical hydrographic best spatio-temporal coverage derived core parameters, including mixed layer depth, heat fluxes over key layers, friction velocity. We provide comprehensive accessible overview conditions encountered along MOSAiC drift, discuss their interdisciplinary implications, compare common climatologies these new data. Our results indicate that, most part, variability was dominated by regional rather than seasonal signals, carrying potentially strong implications biogeochemistry, ecology, even atmospheric conditions. Near-surface properties were strongly influenced relative position sampling, within or outside river-water Transpolar Drift, warming meltwater input. Ventilation down Atlantic Water in Nansen Basin allowed stronger connectivity between subsurface ice surface via elevated upward fluxes. Yermak Plateau Fram Strait regions characterized heterogeneous water mass distributions, energetic currents, lateral gradients frontal regions. Together presented offer context research, fostering improved understanding complex, coupled System.

Language: Английский

Citations

10
Dynamic ice–ocean pathways along the Transpolar Drift amplify the dispersal of Siberian matter DOI Creative Commons
Georgi Laukert, Dorothea Bauch, Benjamin Rabe

et al.

Nature Communications, Journal Year: 2025, Volume and Issue: 16(1)

Published: April 14, 2025

Abstract The Transpolar Drift (TPD) plays a crucial role in regulating Arctic climate and ecosystems by transporting fresh water key substances, such as terrestrial nutrients pollutants, from the Siberian Shelf across Ocean to North Atlantic. However, year-round observations of TPD remain scarce, creating significant knowledge gaps regarding influence sea ice drift ocean surface circulation on transport pathways associated matter. Using geochemical provenance tracer data collected over complete seasonal cycle, our study reveals substantial spatiotemporal variability dispersal matter along TPD. This reflects dynamic shifts contributions individual rivers they integrate into large-scale current system, followed their rapid extensive redistribution through combination ice–ocean exchanges divergent drift. These findings emphasize complexity highlight challenges forecasting dynamics light anticipated changes extent, river discharge, patterns.

Language: Английский

Citations

0
Diatom silicon isotope ratios in Quaternary research: Where do we stand? DOI Creative Commons
Patrick Frings, Virginia N. Panizzo, Jill Sutton

et al.

Quaternary Science Reviews, Journal Year: 2024, Volume and Issue: 344, P. 108966 - 108966

Published: Sept. 16, 2024

Language: Английский

Citations

3
Effects of sea ice retreat and ocean warming on the Laptev Sea continental slope ecosystem (1993 vs 2012) DOI Creative Commons
Christina Bienhold, Vibe Schourup‐Kristensen, Thomas Krumpen

et al.

Frontiers in Marine Science, Journal Year: 2022, Volume and Issue: 9

Published: Dec. 21, 2022

The central Arctic Ocean is rapidly changing due to amplified warming and sea ice retreat. Nonetheless, it remains challenging document decipher impacts on key ecosystem processes such as primary production pelagic-benthic coupling, limited observations in this remote area. Here we investigated environmental changes at the Laptev Sea continental slope (60-3400 m water depth) from surface seafloor, by replicating sample transects two decades apart. Mean break-up of occurred earlier mean freeze-up later 2012 compared 1993, extending ice-free period more than 30 days. On average, model results showed an annual increase 30% study area 2012. In contrast, calculated modelled fluxes particulate organic carbon (POC) seafloor were only slightly higher did not extend far into deep production, possibly a developed retention system. Nevertheless, benthic surveys revealed substantial phytodetritus availability along entire transect shelf edge sea. This calls for input lateral advection shelves, additional ice, and/or late summer bloom. We also composition activity bacterial communities potential linkages observed changes. While abundance, biomass overall community structure no systematic differences between contrasting years all depths, extracellular enzymatic activities had increased result food availability. was partly reflected oxygen uptake, indicating moderate impact remineralization rates time sampling. Our show considerable effects ocean loss Sea, which are likely continue coming decades.

Language: Английский

Citations

11
Essential omega‐3 fatty acids are depleted in sea ice and pelagic algae of the Central Arctic Ocean DOI Creative Commons
Katrin Schmidt, Martin Graeve, Clara J. M. Hoppe

et al.

Global Change Biology, Journal Year: 2023, Volume and Issue: 30(1)

Published: Dec. 19, 2023

Microalgae are the main source of omega-3 fatty acids eicosapentaenoic acid (EPA) and docosahexaenoic (DHA), essential for healthy development most marine terrestrial fauna including humans. Inverse correlations algal EPA DHA proportions (% total acids) with temperature have led to suggestions a warming-induced decline in global production these biomolecules an enhanced importance high latitude organisms their provision. The cold Arctic Ocean is potential hotspot production, but consequences warming unknown. Here, we combine full-seasonal dataset from Central (CAO), results 13 previous field studies 32 cultured strains examine five climate change effects; ice algae loss, community shifts, increase light, nutrients, temperature. were lower ice-covered CAO than warmer peripheral shelf seas, which indicates that paradigm inverse correlation may not hold Arctic. We found no systematic differences summed sea versus pelagic algae, diatoms non-diatoms. Overall, varied up four-fold seasonally 10-fold regionally, pointing strong light nutrient limitations CAO. Where ease Arctic, likely alongside increasing primary nutritional benefits non-ice-associated food web.

Language: Английский

Citations

6
The Importance of Riverine Nutrient Supply for the Marine Silica Pump of Arctic Shelves: Evidence From the Laptev Sea DOI Creative Commons
Margot Debyser, Laetitia Pichevin, Robyn E. Tuerena

et al.

Global Biogeochemical Cycles, Journal Year: 2024, Volume and Issue: 38(4)

Published: March 27, 2024

Abstract Arctic shelves receive a large load of nutrients from rivers, which play major role in the biogeochemical cycles Ocean. In this study, we present measurements dissolved silicon isotopes (δ 30 Si(OH) 4 ) around Laptev Sea and surface waters Eurasian collected October 2018 to document terrestrial modifications on their contribution basin. Nitrogen was found be depleted limiting nutrient primary production Sea, allowing excess export central Heavy δ water column linked strong biological removal DSi shelves, enabled by vigorous N recycling. From isotopically constrained processes, estimate that >50% riverine inputs is removed within Lena River delta shelf. Extrapolating Siberian leads an 2.5 ± 0.8 kmol/s through Transpolar Drift. An updated isotopic budget Ocean reproduces observed signatures out underlines importance processes modulating export. Given opal burial fluxes Artic are controlled denitrification N‐limitation, these sensitive ongoing climate change. As consequence higher shelf responding productivity, it inferred could increase future, accompanied lighter signatures.

Language: Английский

Citations

2
Detrital Input Sustains Diatom Production off a Glaciated Arctic Coast DOI Creative Commons
Hong Chin Ng, Katharine Hendry,

Rachael Ward

et al.

Geophysical Research Letters, Journal Year: 2024, Volume and Issue: 51(12)

Published: June 12, 2024

Abstract In the Arctic and subarctic oceans, relatively low supply of silicon (compared to other nutrients) can make it limiting for growth diatoms, a fundamental building block oceanic food web. Glaciers release large quantities dissolved dissolvable solid amorphous silica phases into high‐latitude estuaries (fjords), but role these glacially‐derived in sustaining diatom coastal open‐water sectors remains unknown. Here we show how stable radiogenic isotopes be used together address this question, using southwest Greenland as case study. This study finds enhanced levels detrital (i.e., mineral) silica, likely glacially‐sourced, portion observed off coast, revealing phytoplankton community function during high‐meltwater periods.

Language: Английский

Citations

2
The Arctic Ocean Nitrogen Cycle DOI
Kevin R. Arrigo, Matthew M. Mills, L. W. Juranek

et al.

Journal of Geophysical Research Biogeosciences, Journal Year: 2024, Volume and Issue: 129(7)

Published: July 1, 2024

Abstract Although the Arctic Ocean is small, its shallow shelves and highly productive coastal waters make it an important component of global biogeochemical cycling, especially nitrogen (N). Because inorganic forms dissolved N exist in so many different oxidation states, cycling can be quite complex. In this review, we describe current understanding major conduits bringing into surface as well key physical biological processes that are responsible for transformation from one form to another. We also discuss environmental factors currently controlling these transformations how may change a future Arctic.

Language: Английский

Citations

1
Atypical Seasonality of the Silicon Cycle in the Yellow River Estuary and Bohai Sea Revealed by Stable Silicon Isotopes DOI Creative Commons

Quanchao Cui,

Xiaowen Liu,

Zhenyan Wang

et al.

Global Biogeochemical Cycles, Journal Year: 2024, Volume and Issue: 38(3)

Published: March 1, 2024

Abstract Biogeochemical Si cycle in coastal areas is of vital importance due to its close link with the carbon cycle. However, has been heavily perturbated by human activities. In this study, we studied spatiotemporal distribution biogenic (BSi) and dissolved (DSi) combined stable isotopes DSi (δ 30 ) Yellow River estuary Bohai Sea, one most populated world. Over an annual cycle, BSi concentrations varied from 0 43.5 μmol L −1 0.3 40 , respectively. This was associated large δ variations +0.49 ± 0.22‰ (2sd) spring +2.92 0.14‰ winter, which opposed observations that summer values were usually higher than those winter. atypical variation could be attributed water‐sediment regulation on occurring every early summer, leading a strong water mixing pattern suppressing diatom production summer. further prolonged extreme autumn rainfall land. The pulse supply nutrients subsequently enhanced primary productivity through spring, resuspended seafloor sediments likely important source <−0.5‰. Our findings suggest natural seasonality greatly masked activities climate events Sea. study serves as reference research endeavors worldwide for revealing overlaying effect anthropogenic consequences variability.

Language: Английский

Citations

1