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Table 1: Candidate environmental variables derived for the EEZ classification

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Environmental variable

Abbreviation

Description

Units

Depth

Depth

Bathymetry grid (1 km resolution)

m

Annual mean solar radiation

Rad_mean

Mean extra atmospheric solar radiation modified by mean annual cloud cover

Wm-2

Winter solar radiation

Rad_wint

Extra atmospheric solar radiation in June, modified by mean annual cloud cover

Wm-2

Wintertime sea surface temperature

SSTwint

Mean of daily data from early September when SST is typically lowest

°C

Annual amplitude of sea surface temperature

SSTanamp

Smoothed annual amplitude of SST

°C

Spatial gradient annual mean sea surface temperature

SSTgrad

Smoothed magnitude of the spatial gradient of annual mean SST

°C km-1

Summertime sea surface temperature anomaly

SSTanom

Spatial anomalies with scales between 20 and 450 km in late February when SST is typically highest

°C

Mean orbital velocity

Orb_v_mean

Orbital velocity at the bed for the mean significant wave height calculated from a 20-year wave hindcast

m/s

Extreme orbital velocity

Orb_v_95

Orbital velocity at the bed for the 95th percentile significant wave height calculated from a 20-year wave hindcast

m/s

Tidal current

Tidal

Depth averaged maximum tidal current

m/s

Sediment type (categorical variable)

Sed

Sediment type as a categorical variable

na

Seabed rate of change of slope (profile)

Bed_prof

The rate of change of slope for each cell

0.01m-1

Seabed curvature

Bed_curv

Curvature of the surface surrounding each grid cell

0.01m-1

Seabed planform curvature

Bed_plan

Curvature of the surface perpendicular to the slope direction

0.01m-1

Freshwater fraction

FW

Proportion of fresh water based on river inputs

proportion

 

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