• The Northern Antarctic Peninsula is a marine climate hotspot of rapid changes on ecosystems and ocean dynamics.

• Introduction to the DSR II Special Volume: Oceanographic processes and biological responses around Northern Antarctic Peninsula: a 15-year contribution of the Brazilian High Latitude Oceanography Group

• This work provides a novel seasonal three-dimensional high-resolution hydrographic gridded data set for the NAP.

• The water masses and oceanographic features in this regional gridded product are more accurate than other climatologies and state estimate products.

• NAPv1.0 product are a valuable tool to be used in studies addressing climatological changes in the unique NAP region.

• The data sets are available in netCDF format at https://doi.org/10.5281/zenodo.4420006 (Dotto et al., 2021)

• DOC was measured in the Bransfield Strait during the end-summer of 2015 and 2016.

• Physicochemical parameters related to the variability of DOC were investigated.

• Significant interannual differences were observed between DOC concentrations.

• ENSO and SAM influenced the interannual structure of the water column.

 

• Long–term cooling, freshening, and lightening (1963–2019) of deep waters in the Bransfield central basin.

• Decreasing ventilation in the Bransfield Strait eastern basin as oxygen declined.
• Reversal of freshening trend between 2010 and 2016 associated with increased contribution of High Salinity Shelf Water.

• Decreasing in salinity after 2016 caused by increased contribution of Low Salinity Shelf Water.

• Increased contribution of High Salinity Shelf Water in the Bransfield Strait related to increased sea ice cover in the northwestern Weddell Sea.

• Satellite-derived images improved the knowledge of CO2 dynamics in the South Atlantic.

• Seasonal algorithms were determined to predict sea surface fCO2 in the study region.

• fCO2 spatial representativeness was enhanced, and bias was reduced over the shelf.

• SST was the main driver of fCO2 seasonal variability in the study region.

• DIC and Alk are also relevant drivers in specific biogeochemical provinces.