ARIOS: a database for ocean acidification assessment in the Iberian upwelling system (1976–2018)
2020
Abstract. A data product of 17 653 discrete samples from 3343 oceanographic stations
combining measurements of pH, alkalinity and other biogeochemical parameters
off the northwestern Iberian Peninsula from June 1976 to September 2018 is
presented in this study. The oceanography cruises funded by 24 projects were
primarily carried out in the Ria de Vigo coastal inlet but also in an area ranging
from the Bay of Biscay to the Portuguese coast. The robust seasonal cycles
and long-term trends were only calculated along a longitudinal section,
gathering data from the coastal and oceanic zone of the Iberian upwelling
system. The pH in the surface waters of these separated regions, which were
highly variable due to intense photosynthesis and the remineralization of
organic matter, showed an interannual acidification ranging from −0.0012
to −0.0039 yr −1 that grew towards the coastline. This result
is obtained despite the buffering capacity increasing in the coastal waters
further inland as shown by the increase in alkalinity by 1.1±0.7 and 2.6±1.0 µ mol kg −1 yr −1 in
the inner and outer Ria de Vigo respectively, driven by interannual changes in the
surface salinity of 0.0193±0.0056 and 0.0426±0.016 psu yr −1 respectively. The loss of the vertical salinity
gradient in the long-term trend in the inner ria was consistent with other
significant biogeochemical changes such as a lower oxygen concentration and
fertilization of the surface waters. These findings seem to be related to a
growing footprint of sediment remineralization of organic matter in the
surface layer of a more homogeneous water column. Data are available at https://doi.org/10.20350/digitalCSIC/12498
(Perez et al., 2020).
Keywords:
- Correction
- Source
- Cite
- Save
- Machine Reading By IdeaReader
92
References
2
Citations
NaN
KQI