Observing Temporally Varying Synoptic‐Scale Total Alkalinity and Dissolved Inorganic Carbon in the Arctic Ocean DOI Creative Commons
Hannah Green, Helen S. Findlay, Jamie D. Shutler

et al.

Earth and Space Science, Journal Year: 2023, Volume and Issue: 10(12)

Published: Dec. 1, 2023

Abstract The long‐term absorption by the oceans of atmospheric carbon dioxide is leading to slow decline ocean pH, a process termed acidification (OA). Arctic challenging region gather enough data examine changes in carbonate chemistry over sufficient scales. However, algorithms that calculate parameters from more frequently measured parameters, such as temperature and salinity, can be used fill gaps. Here, these published were evaluated against situ measurements using different input types (data satellites or re‐analysis climatologies) across Ocean. With lowest uncertainties Atlantic influenced Seas (AiS), where inputs achieved total alkalinity estimates with Root Mean Squared Deviation (RMSD) 21 μmol kg −1 bias 2 ( n = 162) dissolved inorganic RMSD 24 −14 262). AiS results satellite observation show similar but larger RMSD, although due shorter time span available observations, contemporary would provide further assessment improvement. Synoptic‐scale observations surface water conditions are now possible monitor OA, targeted collection needed enable full exploitation observation‐based approaches.

Language: Английский

The future Barents Sea—A synthesis of physical, biogeochemical, and ecological changes toward 2050 and 2100 DOI Creative Commons
Marius Årthun, Khuong V. Dinh, Jakob Dörr

et al.

Elementa Science of the Anthropocene, Journal Year: 2025, Volume and Issue: 13(1)

Published: Jan. 1, 2025

The Barents Sea is a hotspot for ongoing Arctic climate change, manifested in rapid warming of the ocean and atmosphere strong decline winter sea-ice cover. These changes physical environment have large consequences marine ecosystems, including commercial fish populations. In warmer future climate, both ecological are expected to intensify. Here, we provide first comprehensive overview change projections Sea, associated physical, biogeochemical, based on models end-to-end ecosystem models. We also discuss potential human activities their impacts, shipping activity contaminants. analyze results two time horizons—the near-future (2040–2050) far-future (2090–2100)—and different emission scenarios: one with moderate greenhouse gas emissions (SSP2-4.5) high-emission scenario (SSP5-8.5). show that will be warmer, less ice-covered, more acidic, productive, populations spawning sites moving northward. There small differences multi-model mean biogeochemical between scenarios by 2050, while emerge toward end century. implications these far-reaching, identifying sensitivity emissions, informing regional management strategies, potentially needs adaptation already likely occur.

Language: Английский

Citations

1
Coastal freshening drives acidification state in Greenland fjords DOI Creative Commons
Henry Henson, Johnna M. Holding, Lorenz Meire

et al.

The Science of The Total Environment, Journal Year: 2022, Volume and Issue: 855, P. 158962 - 158962

Published: Sept. 26, 2022

Greenland's fjords and coastal waters are highly productive sustain important fisheries. However, retreating glaciers increasing meltwater changing fjord circulation biogeochemistry, which may threaten future productivity. The freshening of Greenland caused by unprecedented melting the Ice Sheet alter carbonate chemistry in waters, influencing CO2 uptake causing biological consequences from acidification. few studies to date explore current acidification state waters. Here we present first-ever large-scale measurements system parameters 16 Greenlandic seek identify drivers these ecosystems. Aragonite saturation (Ω), a proxy for ocean acidification, was calculated dissolved inorganic carbon (DIC) total alkalinity along east west coast spanning 68-75°N. primarily >1 surface mixed layer. undersaturated-or corrosive--conditions (Ω < 1) were observed on both coasts (west: Ω = 0.28-3.11, east: 0.70-3.07), albeit at different depths. West largely corrosive depth while undersaturation East only This reflects difference boundary conditions mechanisms driving state. We suggest that advection Sub Polar Mode Water accumulation DIC organic matter decomposition drive West, freshwater dilution drives East. presence marine terminating also impacted local states circulation: upwelling driven subglacial discharge brought bottom shallower Meanwhile, land strengthened stratification diluted alkalinity. Regardless each system, will likely lower impact biotic abiotic future.

Language: Английский

Citations

24
Vertical Expansion of Aragonite Undersaturated Waters in the Canada Basin of the Arctic Ocean From 2003 to 2019 DOI
Michiyo Yamamoto‐Kawai,

Hirofumi TSUJIMOTO,

Y. Zhang

et al.

Journal of Geophysical Research Oceans, Journal Year: 2025, Volume and Issue: 130(2)

Published: Feb. 1, 2025

Abstract The Canada Basin of the Arctic Ocean is considered region world's open ocean most susceptible to Acidification (OA). This study examines progression OA in Basin, focusing on expansion surface and subsurface aragonite undersaturated waters (USW). Surface USW thickness increased from 0 m 2003 19 ± 2 2019. change was due freshening until 2012, then uptake anthropogenic CO after 2012. In layer, 94 6 136 11 primarily attributed upstream shelf regions, driven by respiration, with some contribution thickening Pacific Winter Water layer. combined layers percentage 0–250 water column 38 3% 62 5% Because concurrent deepening masses enhanced Beaufort Gyre, replacement oversaturated occurred mostly at layer below 190 m. between USWs remained almost unchanged. If Gyre weakens future, it would bring shallower, potentially affecting marine life.

Language: Английский

Citations

0
Extreme Nitrate Deficits in the Western Arctic Ocean: Origin, Decadal Changes, and Implications for Denitrification on a Polar Marginal Shelf DOI
Yanpei Zhuang, Haiyan Jin, Wei‐Jun Cai

et al.

Global Biogeochemical Cycles, Journal Year: 2022, Volume and Issue: 36(7)

Published: June 23, 2022

Abstract The western Arctic Ocean is known to be nitrate deficient relative phosphate but the decadal trend and processes contributing deficit are not clear. To investigate changes in this extreme of over 10 μmol/kg its causal mechanisms, nutrient concentrations were examined along a transect spanning Bering Basin, Bering–Chukchi Shelf, Basin last two decades (1994–2018). results show that has extended greater depths further north during past decades, which coincided with expansion Pacific water Ocean. Subsurface stocks basin areas appear have increased, accompanied by larger deficit, may due stronger shelf denitrification. This loss (∆N) caused denitrification was estimated 7.3 ± 0.1 interval 2012–2018, ∼10% higher than 1994. suggests an intensification on marginal under climatic environmental change

Language: Английский

Citations

18
Sea‐ice loss accelerates carbon cycling and enhances seasonal extremes of acidification in the Arctic Chukchi Sea DOI Creative Commons
Yixing Zhang, Yingxu Wu, Wei‐Jun Cai

et al.

Limnology and Oceanography Letters, Journal Year: 2024, Volume and Issue: 9(4), P. 433 - 441

Published: Feb. 5, 2024

Abstract The Chukchi Sea shelf (CSS) is a highly productive region in the Arctic Ocean and it efficient for absorbing atmospheric carbon dioxide exporting retaining deep sea. However, with global warming, retention time CSS may decrease, leading to less export. Here, we investigate seasonal variability of carbonate chemistry using three sets late‐ vs. early‐summer reoccupations same transect. Our findings demonstrate substantially increased rapid degradation biologically produced organic matter therefore acidification over southern due earlier sea‐ice retreat, resulting significantly shorter time. In sharp contrast, no has been observed northern where photosynthesis just commenced. future, climate change would further diminish export capacity exacerbate not only within but also across other polar coastal oceans.

Language: Английский

Citations

3
China’s Recent Progresses in Polar Climate Change and Its Interactions with the Global Climate System DOI Open Access
Xichen Li, Xianyao Chen, Bingyi Wu

et al.

Advances in Atmospheric Sciences, Journal Year: 2023, Volume and Issue: 40(8), P. 1401 - 1428

Published: April 29, 2023

Language: Английский

Citations

7
Insights into carbonate environmental conditions in the Chukchi Sea DOI Creative Commons
Claudine Hauri, Brita Irving, Sam Dupont

et al.

Biogeosciences, Journal Year: 2024, Volume and Issue: 21(5), P. 1135 - 1159

Published: March 8, 2024

Abstract. Healthy Arctic marine ecosystems are essential to the food security and sovereignty, culture, wellbeing of Indigenous Peoples in Arctic. At same time, highly susceptible impacts climate change ocean acidification. While increasing air temperatures melting sea ice act as direct stressors on ecosystem, they also indirectly enhance acidification, accelerating associated changes inorganic carbon system. Yet, much is be learned about current state variability system remote, high-latitude oceans. Here, we present time series (2016–2020) pH partial pressure dioxide (pCO2) from northeast Chukchi Sea continental shelf. The Ecosystem Observatory includes a suite subsurface year-round moorings sited amid biological hotspot that characterized by high primary productivity rich benthic web turn supports coastal Iñupiat, whales, seals, walrus (Odobenus rosmarus), cod (Boreogadus saida). Our observations suggest near-bottom waters (33 m depth, 13 above seafloor) low aragonite saturation (Ωarag) environment summer fall, when organic material productive remineralizes. During this Ωarag can 0.4. In winter, site was covered ice, <8 remained undersaturated under ice. There were only two short seasonal periods with relatively higher Ωarag, which term acidification relaxation events. spring, production algae phytoplankton blooms led spikes (pH > 8) oversaturation. late strong wind-driven mixing events delivered low-CO2 surface water shelf elevated Ωarag. Given recent rates sudden dramatic shift physical, biogeochemical, ecosystem conditions Sea, it possible observed extreme at deviating carbonate many species adapted.

Language: Английский

Citations

2
Response of nutrients and primary production to high wind and upwelling-favorable wind in the Arctic Ocean: A modeling perspective DOI Creative Commons
Anqi Xu, Meibing Jin, Yingxu Wu

et al.

Frontiers in Marine Science, Journal Year: 2023, Volume and Issue: 10

Published: March 8, 2023

Both remote sensing and numerical models revealed increasing net primary production (NPP) in the Arctic Ocean due to declining sea ice cover ice-free days. The NPP increases some parts of are also hypothesized link high wind (&gt;10 m/s) upwelling-favorable wind, however, mechanism remains unclear. Using Regional System Model (RASM) investigate relationship between we found that seasonal statistically correlated frequency (HWF) Barents (Br) Southern Chukchi Seas (SC) their subsurface nutrients 20-50 m layer. Five five low HWF years along a zonally averaged section were chosen understand spatial variation correlation HWF, NO 3 , SC. During years, decrease exceeds its increase surface, implying utilization by biological productivity. A more positive response north SC than south was because entrained into surface higher HWF. easterly (EWF) Beaufort Canada Basin (BC), where stronger EWF-induced upwelling could bring up from &gt;100 depth. While BC normally north, an EWF can further enhance much those north. Differences reveal is most important around shelf break region, enhanced. enhancement Br less days ratio (IFR), while similar magnitude IFR. As trend continues, it’s necessary advance our understanding on changing regimes different regions.

Language: Английский

Citations

4
Biogeochemical and physical controls on ammonium accumulation on the Chukchi shelf, western Arctic Ocean DOI
Yanpei Zhuang, Yangjie Li, Ling Chen

et al.

Marine Environmental Research, Journal Year: 2023, Volume and Issue: 190, P. 106084 - 106084

Published: July 6, 2023

Language: Английский

Citations

4
Dynamics of the surface carbonate system in oil fields with a high concentration of wells on the northwestern South China Sea shelf DOI
Wei Deng,

Wei Yang,

Hong Tang

et al.

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 916, P. 170261 - 170261

Published: Jan. 21, 2024

Language: Английский

Citations

1