Rapid Acidification of the Arctic Chukchi Sea Waters Driven by Anthropogenic Forcing and Biological Carbon Recycling

Geophysical Research Letters, Journal Year: 2024, Volume and Issue: 51(19)

Published: Oct. 1, 2024

Abstract The acidification of coastal waters is distinguished from the open ocean because much stronger synergistic effects between anthropogenic forcing and local biogeochemical processes. However, research still rather limited in polar oceans. Here, we present a 16 year (2002–2018) observational dataset Chukchi Sea during rapid sea‐ice melting season to determine long‐term changes pH aragonite saturation state (Ω arag ). We found that Ω significantly declined water column with average rates −0.0095 ± 0.0027 years −1 −0.0333 0.0098 , respectively, are 4–6 times faster than those solely due increasing atmospheric CO 2 . attributed increased dissolved inorganic carbon owing combination ice melt‐induced invasion subsurface remineralization induced by surface biological production as result inflow nutrient‐rich Pacific water.

Language: Английский

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Continuous Monitoring and Future Projection of Ocean Warming, Acidification, and Deoxygenation on the Subarctic Coast of Hokkaido, Japan

Frontiers in Marine Science, Journal Year: 2021, Volume and Issue: 8

Published: June 11, 2021

As the ocean absorbs excessive anthropogenic CO 2 and acidification proceeds, it is thought to be harder for marine calcifying organisms, such as shellfish, form their skeletons shells made of calcium carbonate. Recent studies have suggested that various both calcifiers non-calcifiers, will affected adversely by warming deoxygenation. However, regardless effects on calcifiers, spatiotemporal variability parameters affecting deoxygenation has not been elucidated in subarctic coasts Japan. This study conducted first continuous monitoring future projection physical biogeochemical coast Hokkaido, Our results show seasonal change parameters, with higher pH dissolved oxygen (DO) concentration winter than summer, was primarily regulated water temperature. The daily fluctuations, which were daytime at night, mainly photosynthesis primary producers respiration organisms night. projected suggest that, without ambitious commitment reducing other greenhouse gas emissions, following Paris Agreement, impact along become serious, exceeding critical level high temperature 3 months summer being close low saturation state carbonate mid-winter, respectively, end this century. might often prominent assuming fluctuation DO similar present. also importance adaptation strategies local coastal industries, especially fisheries, modifying aquaculture styles.

Language: Английский

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Long-term increasing water quality trends in Hakodate Bay, Hokkaido, driven by meteorological factors

Regional Studies in Marine Science, Journal Year: 2025, Volume and Issue: unknown, P. 104123 - 104123

Published: March 1, 2025

Language: Английский

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RETRACTED: Rapid Acidification of the Arctic Chukchi Sea Waters Driven by Anthropogenic Forcing and Biological Carbon Recycling

Geophysical Research Letters, Journal Year: 2022, Volume and Issue: 49(4)

Published: Feb. 11, 2022

Abstract The acidification of coastal waters is distinguished from the open ocean because much stronger synergistic effects between anthropogenic forcing and local biogeochemical processes. However, research still rather limited in polar oceans. Here, we present a 17‐year (2002–2019) observational data set Chukchi Sea to determine long‐term changes pH aragonite saturation state (Ω arag ). We found that Ω declined different water masses with average rates −0.0047 ± 0.0026 years −1 −0.017 0.009 , respectively, are ∼2–3 times faster than those solely due increasing atmospheric CO 2 . attributed rapid increased dissolved inorganic carbon owing combination ice melt‐induced invasion subsurface remineralization induced by surface biological production as result inflow nutrient‐rich Pacific water.

Language: Английский

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Short-term variation in pH in seawaters around coastal areas of Japan: characteristics and forcings

Biogeosciences, Journal Year: 2024, Volume and Issue: 21(1), P. 177 - 199

Published: Jan. 15, 2024

Abstract. The pH of coastal seawater varies based on several local forcings, such as water circulation, terrestrial inputs, and biological processes, these forcings are changing along with global climate change. Understanding the mechanism variation in each area is thus important for a realistic future projection that considers changes forcings. From 2020 to 2021, we performed parallel year-round observations related ocean parameters at five stations around Japanese coast (Miyako Bay, Shizugawa Kashiwazaki Coast, Hinase Archipelago, Ohno Strait) understand characteristics short-term variations their Annual variability (∼ 1 standard deviation) aragonite saturation state (Ωar) were 0.05–0.09 0.25–0.29, respectively, three areas low anthropogenic pressures Bay), while it increased 0.16–0.21 0.52–0.58, two medium (Hinase Archipelago Strait Seto Inland Sea). Statistical assessment temporal various timescales revealed most annual variabilities both Ωar derived by timescale <10 d, rather than seasonal-scale variation. Our analyses further illustrated was caused thermodynamic processes equally contributed Ωar. observed results showed acidification < 1.5 occurred occasionally Miyako bays, frequently Strait. Most acidified events low-salinity events. amplitude linearly correlated salinity variation, its regression coefficient time high freshwater input positively nutrient concentration main river flows into area.

Language: Английский

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Short-term variation of pH in seawaters around coastal areas of Japan: Characteristics and forcings

Published: May 12, 2023

Abstract. The pH of coastal seawater varies based on several local forcings, such as water circulation, terrestrial inputs, and biological processes, these forcings can change along with global climate change. Understanding the mechanism variation in each area is thus important for a realistic future projection that considers changes forcings. From 2020 to 2021, we performed parallel year-round observations related ocean parameters at five stations around Japanese coast (Miyako Bay, Shizugawa Kashiwazaki Coast, Hinase Archipelago, Ohno Strait) understand characteristics short-term variations their Annual variability (~1 standard deviation) aragonite saturation state (Ωara) were 0.05–0.09 0.25–0.29, respectively, three areas low anthropogenic loadings Bay), while it increased 0.16–0.21 0.52–0.58, two medium (Hinase Archipelago Strait Seto Inland Sea). Statistical assessment temporal various timescales revealed most annual variabilities both Ωara derived by timescale < 10 days, rather than seasonal-scale variation. Our analyses further illustrated was caused thermodynamic processes equally contributed Ωara. observed results showed acidification 1.5 occurred occasionally Miyako Bays, frequently Strait. Most acidified events low-salinity events. amplitude linearly correlated salinity variation, its regression coefficient time high freshwater input positively nutrient concentration main river flows into area.

Language: Английский

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Assessing impacts of coastal warming, acidification, and deoxygenation on Pacific oyster (Crassostrea gigas) farming: a case study in the Hinase area, Okayama Prefecture, and Shizugawa Bay, Miyagi Prefecture, Japan

Biogeosciences, Journal Year: 2023, Volume and Issue: 20(22), P. 4527 - 4549

Published: Nov. 24, 2023

Abstract. Coastal warming, acidification, and deoxygenation are progressing primarily due to the increase in anthropogenic CO2. acidification has been reported have effects that anticipated become more severe as progresses, including inhibiting formation of shells calcifying organisms such shellfish, which include Pacific oysters (Crassostrea gigas), one most important aquaculture resources Japan. Moreover, there is concern regarding combined impacts coastal on oysters. However, spatiotemporal variations indicators pH, aragonite saturation state (Ωarag), dissolved oxygen not observed projected oceanic oyster farms To assess present project future oysters, we performed continuous situ monitoring, numerical modeling, microscopic examination larvae Hinase area Okayama Prefecture Shizugawa Bay Miyagi Prefecture, Japan, both famous for their farms. Our monitoring results first found Ωarag values lower than critical level Hinase, although no impact was identified by examination. modeling suggest be affected seriously warming with pH a prolonged spawning period, may shorten shipping period quality

Language: Английский

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Seasonal pathways of the Tsugaru Warm Current revealed by high-frequency ocean radars

Journal of Oceanography, Journal Year: 2022, Volume and Issue: 78(2), P. 103 - 119

Published: Feb. 8, 2022

Language: Английский

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Intrusion of Coastal Oyashio water to Funka Bay and Tsugaru Strait occasionally disturbed by Kuroshio-originating warm core ring

Journal of Oceanography, Journal Year: 2023, Volume and Issue: 79(4), P. 349 - 366

Published: Jan. 9, 2023

Language: Английский

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The Role of an Intense Jet in the Tsugaru Strait in the Formation of the Outflow Gyre Revealed Using High‐Frequency Radar Data

Geophysical Research Letters, Journal Year: 2021, Volume and Issue: 48(21)

Published: Oct. 31, 2021

Abstract The seasonal features of the eastward jet through Tsugaru Strait was investigated using surface velocity data between 2014 and 2019 obtained from high‐frequency radar located in eastern part strait, as well repeated shipboard observations 2009 to 2019. potential‐vorticity‐front‐model used, volume transport low potential vorticity (PV) water intensity PV gap at front strait were estimated these data. influence parameters on flow pattern Warm Current out Pacific Ocean (the summer/autumn “gyre mode” or winter/spring “coastal mode”) examined. distribution consistent with theoretical understanding, showing that addition transport, an increase local can also contribute development gyre.

Language: Английский

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