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

Damini, Brendon Yuri; Costa, Raul Rodrigo; Dotto, Tiago S.; Mendes, Carlos; Torres-Lasso, Juan Camilo; Azaneu, Marina do V.C.; Mata, Maurício M.; Kerr, Rodrigo

doi:10.1016/j.pocean.2023.102985

Cited by 4 publications

(4 citation statements)

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“…Although widely neglected in biogeochemical studies, mesoscale eddies may have a relevant impact on nutrient supply along the northern Antarctic Peninsula. Such structures can favor nutrient supply via upwelling of waters enriched with remineralized material (Damini et al 2023) and by intensifying remineralization by deepening the mixed layer depth within the eddies (Dufois et al 2014; Damini et al 2023). Moreover, eddies can trap advected water masses (Damini et al 2023) with high remineralized nutrient content (Dufois et al 2014), such as modified Warm Deep Water (a mixture of Circumpolar Deep Water with Winter Water in the Weddell Sea; Hoppema et al 2015).…”

Section: Discussionmentioning

confidence: 99%

“…However, little is known about its influence on the variability of macronutrient concentrations along the northern Antarctic Peninsula (Henley et al 2019). The effect of topography and ocean circulation also leads to the formation of mesoscale eddies and increased eddy‐fueled productivity in the eastern basin of Bransfield Strait (Wang et al 2022; Damini et al 2023), although these processes are often neglected in biogeochemical studies due to their complexity. Understanding temporal variability patterns of macronutrients is also a challenge along the northern Antarctic Peninsula, because the response time to SAM and ENSO variability modes is not well elucidated (Barlett et al 2018; Wang et al 2022) and the mesoscale processes themselves may also play an important role in this variability (Kerr et al 2018 a ; Henley et al 2019).…”

Section: Figmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 99%

Section: Figmentioning

confidence: 99%

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 inorganic carbon cycle of the Bransfield Strait experiences large interannual variability, swinging between periods of net CO 2 source to the atmosphere (2009) and net CO 2 sink toward the ocean (2008( , Ito et al, 2018. This behavior has been recently pointed to be influenced by the strength of mesoscale structures, such as anticyclonic eddies (e.g., Damini et al, 2023). A long-term assessment of CO 2 fluxes in the vicinity of the Bransfield Strait has shown that coastal zones have acted as strong CO 2 sink zones since 2012 (Monteiro, Kerr, Orselli, et al, 2020), which is also observed southwards (Brown et al, 2019).…”

Section: Biogeochemical Aspects Of the Bransfield Straitmentioning

confidence: 99%

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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“…Studies have shown an increase in the carbon sink potential of the continental Shelf water (SW) of this region (Brown et al., 2019; Shadwick et al., 2021), and certain part of this region is almost close to CO 2 saturation (Santos‐Andrade et al., 2023). The CO 2 source and sink characteristics are influenced by the hydrographic structure and phytoplankton community composition (Damini et al., 2023). A large amount of inorganic carbon uptake by biological production occurs during summer, resulting in relatively high pH values in the surface water (Hauri et al., 2015; Jones et al., 2017).…”

Section: Introductionmentioning

confidence: 99%

Combined Effect of Anthropogenic and “Natural” Carbon on Acidification of the Subsurface Ocean Water at the Tip of the Antarctic Peninsula

Zhan,

Zhang,

et al. 2023

JGR Oceans

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Dissolved inorganic carbon, total alkalinity, and dissolved N2O samples of upper 500 m were collected at the tip of the Antarctic Peninsula during the 32nd Chinese Antarctic National Research Expedition. The pH and anthropogenic carbon were calculated and the results show that the patterns of anthropogenic carbon uptake and acidification progresses are different in two adjacent regions of this study area. In the region of Weddell‐Scotia confluence, hydrographic processes such as convection prompt the transport of anthropogenic carbon into the subsurface layer, whereas in the region east of Powell Basin, where stratification existed, the downward transport of anthropogenic carbon to this depth is inhibited. However, the pH values indicate that the acidification status of the subsurface waters that are influenced by the above two hydrographic features are similar or even identical at a certain depth range. The progress of ocean acidification in the well‐ventilated region are dominated by anthropogenic carbon uptake, while in the adjacent well‐stratified region, anthropogenic carbon uptake and in situ remineralization of organic matter or horizontal advection of carbon rich water masses or both. In the later region, anthropogenic carbon uptake and in situ remineralization (or horizontal advection) contribute 40% and 60% to pH decline, respectively, suggesting that pH value in water mass of this region may significantly influenced by natural processes.

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

Cited by 4 publications

References 123 publications

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

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

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

Combined Effect of Anthropogenic and “Natural” Carbon on Acidification of the Subsurface Ocean Water at the Tip of the Antarctic Peninsula

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

Cited by 4 publications

References 123 publications

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

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

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

Combined Effect of Anthropogenic and “Natural” Carbon on Acidification of the Subsurface Ocean Water at the Tip of the Antarctic Peninsula

Contact Info

Product

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