Reply on RC2 DOI Creative Commons
Ivan Kuznetsov

Published: Dec. 23, 2023

Abstract. The Arctic Ocean is a region important for global and regional climate. Although generally quiescent compared to mid-latitudes, the upper ocean hosts mesoscale smaller scale processes. These processes can have profound impact on vertical fluxes, stratification, feedback with sea ice atmosphere. Sparse non-synoptic in-situ observations of polar oceans are limited by distribution manual observing platforms autonomous instrumentation. Analyzing observational data assess tracer field gradients dynamics becomes highly challenging when measurement drift pack due continuous changes in speed direction. This work presents dynamical reconstruction state, based Multidisciplinary Observatory Study Climate (MOSAiC) experiment. Overall, model reproduce lateral structure temperature, salinity, density fields, which allows projecting dynamically consistent features these fields onto regular grid. We identify two separate depth ranges enhanced eddy kinetic energy, located around maxima buoyancy frequency: halocline warm (modified) Atlantic Water. Simulations reveal notable decrease surface layer salinity towards north, accompanied high variability mixed south-north And no significant horizontal but an increase from west east 0.084 m/km gradient 0.6 standard deviation, indicating opposite characteristics resolves several stationary eddies Water provides insights into associated dynamics. obtained three-dimensional temperature be used further analysis thermohaline related submesoscale Central Arctic. Dynamic comparison state-of-the-art climate Earth System Models. developed nudging method utilize future diverse set instruments.

Language: Английский

Spatio-Temporal Variability of Suspended Particulate Matter in a High-Arctic Estuary (Adventfjorden, Svalbard) Using Sentinel-2 Time-Series DOI Creative Commons
Daniela Walch, Rakesh Kumar Singh, Janne E. Søreide

et al.

Remote Sensing, Journal Year: 2022, Volume and Issue: 14(13), P. 3123 - 3123

Published: June 29, 2022

Arctic coasts, which feature land-ocean transport of freshwater, sediments, and other terrestrial material, are impacted by climate change, including increased temperatures, melting glaciers, changes in precipitation runoff. These trends assumed to affect productivity fjordic estuaries. However, the spatial extent temporal variation freshwater-driven darkening fjords remain unresolved. The present study illustrates spatio-temporal variability suspended particulate matter (SPM) Adventfjorden estuary, Svalbard, using in-situ field campaigns ocean colour remote sensing (OCRS) via high-resolution Sentinel-2 imagery. To compute SPM concentration (CSPMsat), a semi-analytical algorithm was regionally calibrated local data, improved accuracy satellite-derived ~20% (MRD). Analysis for two consecutive years (2019, 2020) revealed strong seasonality Adventfjorden. Highest estimated concentrations river plume (% fjord with CSPMsat > 30 mg L−1) occurred during June, July, August. Concurrently, we observed relationship between average air temperature over 24 h prior observation (R2 = 0.69). Considering predicted environmental conditions region, this highlights importance rapidly changing parameters significance analysing fluxes light attenuating particles, especially coastal Ocean.

Language: Английский

Citations

24
Manganese reduction and associated microbial communities in Antarctic surface sediments DOI Creative Commons
Lea C. Wunder,

Inga Breuer,

Graciana Willis-Poratti

et al.

Frontiers in Microbiology, Journal Year: 2024, Volume and Issue: 15

Published: July 3, 2024

The polar regions are the fastest warming places on earth. Accelerated glacial melting causes increased supply of nutrients such as metal oxides (i.e., iron and manganese oxides) into surrounding environment, marine sediments Potter Cove, King George Island/Isla 25 de Mayo (West Antarctic Peninsula). Microbial oxide reduction associated microbial communities poorly understood in sediments. Here, we investigated this process by geochemical measurements situ sediment pore water slurry incubation experiments which were accompanied 16S rRNA sequencing. Members genus Desulfuromusa main responder to acetate amendment incubations. Other organisms identified relation and/or utilization included Desulfuromonas , Sva1033 (family Desulfuromonadales ) unclassified Arcobacteraceae . Our data show that distinct members most active organotrophic reduction, thus providing strong evidence their relevance permanently cold

Language: Английский

Citations

5
Climate-driven changes in underwater irradiance and primary productivity in an Antarctic fjord (Potter Cove, Western Antarctic Peninsula) DOI Creative Commons
Dolores Deregibus, María Liliana Quartino,

Eduardo Ruiz Barlett

et al.

The Science of The Total Environment, Journal Year: 2025, Volume and Issue: 960, P. 178249 - 178249

Published: Jan. 1, 2025

Language: Английский

Citations

0
Changes in tidal dynamics in response to sea level rise in the Sylt-Rømø Bight (Wadden Sea) DOI Creative Commons
Gaziza Konyssova, Vera Sidorenko, Alexey Androsov

et al.

Ocean Dynamics, Journal Year: 2025, Volume and Issue: 75(5)

Published: May 1, 2025

Language: Английский

Citations

0
Potter Cove's Heavyweights: Estimation of Species' Interaction Strength of an Antarctic Food Web DOI Creative Commons
Iara Diamela Rodríguez, Leonardo Saravia

Ecology and Evolution, Journal Year: 2024, Volume and Issue: 14(11)

Published: Nov. 1, 2024

ABSTRACT In the West Antarctic Peninsula, global warming has led to severe alterations in community composition, species distribution, and abundance over last decades. Understanding complex interplay between structure stability of marine food webs is crucial for assessing ecosystem resilience, particularly context ongoing environmental changes. this study, we estimate interaction strength within Potter Cove (South Shetland Islands, Antarctica) web elucidate roles its functioning. We use these estimates calculate response perturbations, conducting sequential extinctions quantify importance individual based on changes fragmentation. explore connections key topological properties web. Our findings reveal an asymmetric distribution strengths, with a prevalence weak interactions few strong ones. Species exerting greater influence displayed higher degree trophic similarity but occupied lower levels omnivory (e.g., macroalgae detritus). Extinction simulations revealed role certain species, amphipods black rockcod Notothenia coriiceps , as their removal significant network This study highlights considering strengths polar ecosystems. These insights have implications guiding monitoring conservation strategies aimed at preserving integrity

Language: Английский

Citations

1
Dynamical reconstruction of the upper-ocean state in the Central Arctic during the winter period of the MOSAiC Expedition DOI Creative Commons
Ivan Kuznetsov, Benjamin Rabe, Alexey Androsov

et al.

Published: June 28, 2023

Abstract. The Arctic Ocean is a region important for global and regional climate. Although generally quiescent compared to mid-latitudes, the upper ocean hosts mesoscale smaller scale processes. These processes can have profound impact on vertical fluxes, stratification, feedback with sea ice atmosphere. Sparse non-synoptic in-situ observations of polar oceans are limited by distribution manual observing platforms autonomous instrumentation. Analyzing observational data assess tracer field gradients dynamics becomes highly challenging when measurement drift pack due continuous changes in speed direction. This work presents dynamical reconstruction state, based Multidisciplinary Observatory Study Climate (MOSAiC) experiment. Overall, model reproduce lateral structure temperature, salinity, density fields, which allows projecting dynamically consistent features these fields onto regular grid. We identify two separate depth ranges enhanced eddy kinetic energy, located around maxima buoyancy frequency: halocline warm (modified) Atlantic Water. Simulations reveal notable decrease surface layer salinity towards north, accompanied high variability mixed south-north And no significant horizontal but an increase from west east 0.084 m/km gradient 0.6 standard deviation, indicating opposite characteristics resolves several stationary eddies Water provides insights into associated dynamics. obtained three-dimensional temperature be used further analysis thermohaline related submesoscale Central Arctic. Dynamic comparison state-of-the-art climate Earth System Models. developed nudging method utilize future diverse set instruments.

Language: Английский

Citations

3
The discovery of the southernmost ultra-high-resolution Holocene paleoclimate sedimentary record in Antarctica DOI Creative Commons
Francesca Battaglia, Laura De Santis, Luca Baradello

et al.

Marine Geology, Journal Year: 2023, Volume and Issue: 467, P. 107189 - 107189

Published: Dec. 4, 2023

The response of the Antarctic ice sheet to climate warming is main source uncertainty regarding future global sea level rise, since little known about its present and past dynamics. last deglaciation most recent interval large-scale warming, during which Northern Southern Hemisphere sheets retreated, rose globally, although at a non-uniform rate. Geologic records from polar regions are fundamental in determining factors that caused major changes deglacial under different boundary conditions. Here, we combine morpho-bathymetric seismic data with sediment cores oceanographic measurements reconstruct processes influenced deposition southernmost, extensive, ultrahigh-resolution record Holocene Edisto Inlet fjord (Ross Sea, Antarctica). We find post-glacial sedimentation resulted layered diatom mud up 110 m thick was locally redistributed by bottom currents over confined drifts-moats central part fjord. After climatic optimum, not carved ground ice, there continued be internal water circulation associated Ross Sea circulation. These results support retreat coastal glaciers 11 kiloyears ago (ka) continental shelf North Victoria Land.

Language: Английский

Citations

3
Dynamical reconstruction of the upper-ocean state in the central Arctic during the winter period of the MOSAiC expedition DOI Creative Commons
Ivan Kuznetsov, Benjamin Rabe, Alexey Androsov

et al.

Ocean science, Journal Year: 2024, Volume and Issue: 20(3), P. 759 - 777

Published: June 11, 2024

Abstract. This paper presents a methodological tool for dynamic reconstruction of the state ocean, based, as an example, on observations from Multidisciplinary drifting Observatory Study Arctic Climate (MOSAiC) experiment. The data used in this study were collected Amundsen Basin between October 2019 and January 2020. Analysing observational to assess tracer field upper-ocean dynamics is highly challenging when measurement platforms drift with ice pack due continuous speed direction changes. We have equipped new version coastal branch global Finite-volumE sea ice–Ocean Model (FESOM-C) nudging method. was carried out assuming quasi-steady state. Overall, model can reproduce lateral vertical structure temperature, salinity, density fields, which allows projecting dynamically consistent features these fields onto regular grid. identify two separate depth ranges enhanced eddy kinetic energy located around maxima buoyancy frequency: upper halocline warm (modified) Atlantic Water. Simulations reveal notable decrease surface layer salinity towards north but no significant gradient east west. However, we find mixed-layer deepening west, 0.084 m km−1 at 0.6 standard deviation, compared weak south north. resolves several stationary eddies Water provides insights into associated dynamics. output be further analyse thermohaline related mesoscale submesoscale processes central Arctic, such estimates heat fluxes or mass transport. developed method utilized incorporate diverse set instruments analysis MOSAiC expedition.

Language: Английский

Citations

0
Tracking suspended particulate organic matter biochemistry from glacial meltwater runoff to coastal waters of an Antarctic fjord DOI

Claudia Parodi,

Luis Moroni Cerpa Cornejo, ⎜Zhuoyi Zhu

et al.

Marine Chemistry, Journal Year: 2024, Volume and Issue: unknown, P. 104455 - 104455

Published: Sept. 1, 2024

Language: Английский

Citations

0
Global warming facilitated environmental change effects on CO2 releasing microbes in Antarctic sediments DOI Creative Commons
David A. Aromokeye, Graciana Willis-Poratti, Lea C. Wunder

et al.

Research Square (Research Square), Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 14, 2024

Abstract Rapid melting of the Western Antarctic Peninsula (WAP) glaciers is a compelling piece evidence how climate change affects our planet. This study investigated impact global warming-facilitated environmental on microbial community structure and function by subjecting sediments sampled near Fourcade Glacier in Potter Cove, WAP, to temperature gradient supply metabolic nutrients relevant for fate carbon marine ecosystems. We found that (i) as key driver will significantly structure, but ecological functions supported fresh from glacial meltwater prevail; (ii) keystone species responsible specialized are metabolically flexible, persisting 2°C 25°C; (iii) addition species, warming activate certain hitherto inactive endogenous microorganisms response either changes or nutrient flux sustain ecosystem functions. Our presents sediment microbiome resilience strong shifts, thereby adding another layer nature’s adaptability warming.

Language: Английский

Citations

0