The marine carbonate system along the northern Antarctic Peninsula: current knowledge and future perspectives

Orselli, Iole B.M.; Carvalho, Andréa da Consolação de Oliveira; Monteiro, Thiago; Damini, Brendon Yuri; Carvalho-Borges, Mariah de; Albuquerque, Cíntia; Kerr, Rodrigo

doi:10.1590/0001-3765202220210825

Cited by 3 publications

(7 citation statements)

References 132 publications

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“…First, it is well known that changes in the cryosphere system (e.g., sea ice variability and continental meltwater input) and other hydrographic dynamics can affect the carbonate system variability through changes in salinity (e.g., Henley et al., 2019; Orselli et al., 2022). Freshwater input or removal can alter TA and CT.…”

Section: Discussionmentioning

confidence: 99%

“…The precision for temperature and practical salinity measurements are ∼0.001°C and ∼0.003°C, respectively (Dotto, Kerr, et al., 2021). The TA and CT measurements spanned 2015–2019 (Orselli et al., 2022) and were measured simultaneously by potentiometric titration in a closed cell with an automated titrator (see details at Kerr, Orselli et al. (2018); Figure S2b in Supporting Information S1).…”

Section: Methodsmentioning

confidence: 99%

“…Moreover, some recent studies have also shown the impacts of ENSO or SAM on physical, biological, and biogeochemical parameters in the strait (Avelina et al, 2020;Costa et al, 2020;Damini et al, 2022;Dotto et al, 2016). A recent overview of state-of-the-art of carbonate chemistry and the challenges facing the NAP environments can be viewed in Orselli et al (2022) and references therein.…”

Section: Biogeochemical Aspects Of the Bransfield Straitmentioning

confidence: 99%

“…A recent overview of state‐of‐the‐art of carbonate chemistry and the challenges facing the NAP environments can be viewed in Orselli et al. (2022) and references therein.…”

Section: Oceanographic Features Of the Bransfield Straitmentioning

confidence: 99%

“…The precision for temperature and practical salinity measurements are ∼0.001°C and ∼0.003°C, respectively . The TA and CT measurements spanned 2015-2019 (Orselli et al, 2022) and were measured simultaneously by potentiometric titration in a closed cell with an automated titrator (see details at ; Figure S2b in Supporting Information S1). Quality control of TA and CT data was performed through analyses of Certified Reference Material from the Scripps Institution of Oceanography (Dickson et al, 2003).…”

Section: Data Collectionmentioning

confidence: 99%

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Drivers of Marine CO₂‐Carbonate Chemistry in the Northern Antarctic Peninsula

Santos‐Andrade

Kerr

Orselli

et al. 2023

Global Biogeochemical Cycles

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The Bransfield Strait is a climate change hotspot at the tip of the northern Antarctic Peninsula (NAP). The region is marked by a mixture of relatively warm waters from the Bellingshausen Sea with cold shelf waters from the Weddell Sea. Additionally, its deep central basin (>800 m) preserves seawater properties from the north‐western Weddell Sea continental shelf. This study assessed long‐term changes in carbonate chemistry in the Bransfield Strait and found that the hydrographic setting (i.e., a mixture between modified‐Circumpolar Deep Water with Dense Shelf Water [DSW]) drives temporal variability of carbonate parameters. The western basin has experienced decreases in pH (seawater scale) over the last three decades (1996–2019), varying from −0.003 to −0.017 pH units yr−1, while Ωar decreased from −0.01 to −0.07 yr−1 throughout the water column. The central basin was characterized by a high contribution of DSW with high carbon dioxide (CO2) content and the decomposition of organic matter produced and transported into its deep layer. With lower variability for all carbonate system variables, the eastern basin was likely regulated by internal mixing. Overall, the entire strait is almost reaching a CO2‐saturated condition, highlighting how sensitive subpolar regions are to the effects of human‐induced climate change.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Biogeochemical Aspects Of the Bransfield Straitmentioning

confidence: 99%

“…A recent overview of state‐of‐the‐art of carbonate chemistry and the challenges facing the NAP environments can be viewed in Orselli et al. (2022) and references therein.…”

Section: Oceanographic Features Of the Bransfield Straitmentioning

confidence: 99%

Section: Data Collectionmentioning

confidence: 99%

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Drivers of Marine CO₂‐Carbonate Chemistry in the Northern Antarctic Peninsula

Santos‐Andrade

Kerr

Orselli

et al. 2023

Global Biogeochemical Cycles

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Spatiotemporal variability of dissolved inorganic macronutrients along the northern Antarctic Peninsula (1996–2019)

Monteiro,

Henley,

Pollery

et al. 2023

Limnology & Oceanography

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The northern Antarctic Peninsula is a key region of the Southern Ocean due to its complex ocean dynamics, distinct water mass sources, and the climate‐driven changes taking place in the region. Despite the importance of macronutrients in supporting strong biological carbon uptake and storage, little is known about their spatiotemporal variability along the northern Antarctic Peninsula. Hence, we explored for the first time a 24‐year time series (1996–2019) in this region to understand the processes involved in the spatial and interannual variability of macronutrients. We found high macronutrient concentrations, even in surface waters and during strong phytoplankton blooms. Minimum concentrations of dissolved inorganic nitrogen (DIN; 16 μmol kg−1), phosphate (0.7 μmol kg−1), and silicic acid (40 μmol kg−1) in surface waters are higher than those recorded in surrounding regions. The main source of macronutrients is the intrusions of Circumpolar Deep Water and its modified variety, while local sources (organic matter remineralization, water mass mixing, and mesoscale structures) can enhance their spatiotemporal variability. However, we identified a depletion in silicic acid due to the influence of Dense Shelf Water from the Weddell Sea. Macronutrient concentrations show substantial interannual variability driven by the balance between the intrusions of modified Circumpolar Deep Water and advection of Dense Shelf Water, which is largely modulated by the Southern Annular Mode (SAM) and to some extent by El Niño‐Southern Oscillation (ENSO). These findings are critical to improving our understanding of the natural variability of this Southern Ocean ecosystem and how it is responding to climate changes.

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Antarctica Slope Front bifurcation eddy: A stationary feature influencing CO2 dynamics in the northern Antarctic Peninsula

Damini

Costa

Dotto

et al. 2023

Progress in Oceanography

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The marine carbonate system along the northern Antarctic Peninsula: current knowledge and future perspectives

Cited by 3 publications

References 132 publications

Drivers of Marine CO₂‐Carbonate Chemistry in the Northern Antarctic Peninsula

Drivers of Marine CO₂‐Carbonate Chemistry in the Northern Antarctic Peninsula

Spatiotemporal variability of dissolved inorganic macronutrients along the northern Antarctic Peninsula (1996–2019)

Antarctica Slope Front bifurcation eddy: A stationary feature influencing CO2 dynamics in the northern Antarctic Peninsula

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The marine carbonate system along the northern Antarctic Peninsula: current knowledge and future perspectives

Cited by 3 publications

References 132 publications

Drivers of Marine CO2‐Carbonate Chemistry in the Northern Antarctic Peninsula

Drivers of Marine CO2‐Carbonate Chemistry in the Northern Antarctic Peninsula

Spatiotemporal variability of dissolved inorganic macronutrients along the northern Antarctic Peninsula (1996–2019)

Antarctica Slope Front bifurcation eddy: A stationary feature influencing CO2 dynamics in the northern Antarctic Peninsula

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Product

Resources

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Drivers of Marine CO₂‐Carbonate Chemistry in the Northern Antarctic Peninsula

Drivers of Marine CO₂‐Carbonate Chemistry in the Northern Antarctic Peninsula