Moving 10-years analysis of nitrate plus nitrite at Northeast Atlantic Ocean for each season:

- winter: January-March,

- spring: April-June,

- summer: July-September,

- autumn: October-December.

Every year of the time dimension corresponds to the 10-year centred average of each season. Decades span :

- from 1984-1993 until 2005-2014 (winter)

- from 1979-1988 until 2005-2014 (spring)

- from 1982-1991 until 2005-2014 (summer)

- from 1972-1981 until 2005-2014 (autumn)

Observational data span from 1962 to 2014.

Depth range (IODE standard depths): -3000.0, -2500.0, -2000.0, -1750, -1500.0, -1400.0, -1300.0, -1200.0, -1100.0, -1000.0, -900.0, -800.0, -700.0, -600.0, -500.0, -400.0, -300.0, -250.0, -200.0, -150.0, -125.0, -100.0, -75.0, -50.0,-40.0, -30.0, -20.0, -10.0, -5.0, -0.0

Data Sources: observational data from SeaDataNet/EMODNet Chemistry Data Network.

Description of DIVA analysis: Geostatistical data analysis by DIVA (Data-Interpolating Variational Analysis) tool. GEBCO 1min topography is used for the contouring preparation. Analyzed filed masked using relative error threshold 0.3 and 0.5 DIVA settings. Signal to noise ratio and correlation length were optimized and filtered vertically and a seasonally-averaged profile was used. Logarithmic transformation applied to the data prior to the analysis. Background field: the data mean value is subtracted from the data. Detrending of data: no, Advection consraint applied: no.

Units: umol/l