Midlatitude shelf seas: a NW European perspective on the seasonal dynamics of temperature, salinity and oxygen isotopes (original) (raw)

Pronounced seasonal variability, particularly in the surface ocean heat flux, imparts an important control that drives thermal stratification of the tide-dominated middle-and high-latitude shelf seas. Bottom water temperature and salinity data, resolved on a grid 20? latitude by 30? longitude, were combined with a regional synthesis of the salinity:d 18 O relationship in order to generate a spatial and temporal understanding of oxygen isotopes in seawater around the shelf seas of NW Europe. The data are expressed according to equilibrium calcite (d 18 O Eq.calcite ) and, in the shallow mixed water column, exhibit large seasonal changes that are primarily driven by bottom water temperature. Annual bottom water temperature varies from B/38C to /178C in the southern North Sea, generating a seasonal d 18 O Eq.calcite signal of up to 3.2. The amplitude of the seasonal d 18 O Eq.calcite signal is significantly damped (0.1 Á0.2) in deeper, thermally stratified shelf waters. Maps of the monthly distribution d 18 O Eq.calcite provide the first systematic overview of the spatial and temporal changes on the NW European shelf and highlight the importance of understanding seasonal growth on the incorporation of geochemical signatures into marine organisms.

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