Contrasting dissolved organic carbon concentrations in the Bransfield Strait, Northern Antarctic Peninsula: insights into ENSO and SAM effects

Avelina, Raquel; Cunha, Letícia Cotrim da; Farias, Cassia O.; Hamacher, Claudia; Kerr, Rodrigo; Mata, Maurício M.

doi:10.1016/j.jmarsys.2020.103457

Cited by 10 publications

(15 citation statements)

References 68 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The rise in salinity was strong enough to bring the mean-salinity of 2014 (i.e., last year of their time series) close to the ones reported for the early-1980s. These interannual changes in the hydrographic and also the biogeochemical properties distribution may be recently linked with large-scale climate modes of variability, such as the Southern Annular Mode (SAM) and the El Niño-Southern Oscillation (ENSO) (e.g., Dotto et al, 2016;Ruiz Barlett et al, 2018;Avelina et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Long-term changes on the Bransfield Strait deep water masses: Variability, drivers and connections with the northwestern Weddell Sea

Damini

Kerr

Dotto

et al. 2022

Deep Sea Research Part I: Oceanographic Research Papers

Self Cite

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Long-term changes on the Bransfield Strait deep water masses: Variability, drivers and connections with the northwestern Weddell Sea

Damini

Kerr

Dotto

et al. 2022

Deep Sea Research Part I: Oceanographic Research Papers

Self Cite

View full text Add to dashboard Cite

“…For at least the past fifty years, the deep waters of the Bransfield Strait have shown significant trends of freshening and lightening, with impacts on the volume of these regional dense waters (Azaneu et al, 2013;Dotto et al, 2016;Ruiz Barlett et al, 2018). Considering that these waters are formed by a parcel of ∼ 60 %-80 % of HSSW+LSSW (Gordon et al, 2000;Dotto et al, 2016), the freshening signal may be driven by modification of the water masses sourced in the Weddell Sea continental shelf (van Caspel et al, 2015(van Caspel et al, , 2018, possibly due to the melting of ice shelves and glaciers in the Antarctic Peninsula (Cook et al, 2016;Rignot et al, 2019).…”

mentioning

confidence: 99%

“…Additionally, positive SAM may restrict the connections between the Weddell Sea and the Bransfield Strait (Renner et al, 2012), with the potential of reducing the inflow of cold waters into the NAP (Dotto et al, 2016). Also, the changes in the ocean dynamics along the NAP driven by SAM and El Niño-Southern Oscillation have been recently associated with the variability of the dissolved organic carbon inventory (Avelina et al, 2020). The ongoing changes in the Southern Hemisphere wind pattern, i.e.…”

mentioning

confidence: 99%

A novel hydrographic gridded data set for the northern Antarctic Peninsula

Dotto

Mata

Kerr

et al. 2021

Earth Syst. Sci. Data

Self Cite

View full text Add to dashboard Cite

Abstract. The northern Antarctic Peninsula (NAP) is a highly dynamic transitional zone between the subpolar-polar and oceanic-coastal environments, and it is located in an area affected by intense climate change, including intensification and spatial shifts of the westerlies as well as atmospheric and oceanic warming. In the NAP area, the water masses originate mainly from the Bellingshausen and Weddell seas, which create a marked regional dichotomy thermohaline characteristic. Although the NAP area has relatively easy access when compared to other Southern Ocean environments, our understanding of the water masses' distribution and the dynamical processes affecting the variability of the region is still limited. That limitation is closely linked to the sparse data coverage, as is commonly the case in most Southern Ocean environments. This work provides a novel seasonal three-dimensional high-resolution hydrographic gridded data set for the NAP (version 1), namely the NAPv1.0. Hydrographic measurements from 1990 to 2019 comprising data collected by conductivity, temperature, depth (CTD) casts; sensors from the Marine Mammals Exploring the Oceans Pole to Pole (MEOP) consortium; and Argo floats have been optimally interpolated to produce maps of in situ temperature, practical salinity, and dissolved oxygen at ∼ 10 km spatial resolution and 90 depth levels. The water masses and oceanographic features in this regional gridded product are more accurate than other climatologies and state estimate products currently available. The data sets are available in netCDF format at https://doi.org/10.5281/zenodo.4420006 (Dotto et al., 2021). The novel and comprehensive data sets presented here for the NAPv1.0 product are a valuable tool to be used in studies addressing climatological changes in the unique NAP region since they provide accurate initial conditions for ocean models and improve the end of the 20th- and early 21st-century ocean mean-state representation for that area.

show abstract

“…The region has also stored ∼20-50 μmol kg −1 of anthropogenic carbon around the NAP (Anderson et al, 1991;Lencina-Avila et al, 2018;Pardo et al, 2014), which likely comes from recently ventilated DSW (Kerr, Goyet, et al, 2018). 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%

“…This, therefore, implies high organic matter sedimentation around the entire peninsula (Fischer, 1991; Masqué et al., 2002). Also, intense primary production in the north‐western Weddell Sea continental shelf (Detoni et al., 2015; Mendes et al., 2012) likely promotes high dissolved organic carbon concentrations in the deep basins of Bransfield Strait (Avelina et al., 2020). Furthermore, regions related to islands and coastal zones in the strait are also associated with high organic carbon concentrations, such as Deception Island and Admiralty Bay (Costa et al., 2022; Doval et al., 2002).…”

Section: Oceanographic Features 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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Contrasting dissolved organic carbon concentrations in the Bransfield Strait, Northern Antarctic Peninsula: insights into ENSO and SAM effects

Cited by 10 publications

References 68 publications

Long-term changes on the Bransfield Strait deep water masses: Variability, drivers and connections with the northwestern Weddell Sea

Long-term changes on the Bransfield Strait deep water masses: Variability, drivers and connections with the northwestern Weddell Sea

A novel hydrographic gridded data set for the northern Antarctic Peninsula

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

Contact Info

Product

Resources

About

Contrasting dissolved organic carbon concentrations in the Bransfield Strait, Northern Antarctic Peninsula: insights into ENSO and SAM effects

Cited by 10 publications

References 68 publications

Long-term changes on the Bransfield Strait deep water masses: Variability, drivers and connections with the northwestern Weddell Sea

Long-term changes on the Bransfield Strait deep water masses: Variability, drivers and connections with the northwestern Weddell Sea

A novel hydrographic gridded data set for the northern Antarctic Peninsula

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

Contact Info

Product

Resources

About

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