Table 2: Candidate environmental variables derived for the Hauraki Gulf classification

Physical variable	Abbreviation	Description	Units
SST annual amplitude	SST_ann_ampl	SST annual amplitude	°C
SST annual phase	SST_ann_phase	SST annual phase	Days
SST mean	SST_mean	Mean SST	°C
SST semi-annual amplitude	SST_sann_ampl	SST semi-annual amplitude	°C
SST within-month standard deviation	SST_mth_std	SST within-month standard deviation	°C
Mean freshwater fraction	Fresh_fract	Mean freshwater fraction	na
Depth	Depth	Depth	M
Seabed relief curvature	Hau_curv	Curvature of the surface surrounding each grid cell	0.01m^-1
Seabed relief-profile	Hau_prof	The rate of change of slope for each cell	0.01m^-1
Seabed relief-planiform	Hau_plan	Curvature of the surface perpendicular to the slope direction	0.01m^-1
Seabed slope	Slope	Slope based on adjacent cells in depth grid	0.01m^-1
Mean peak bed orbital velocity	Orb_vel_mean	Orbital velocity at the bed for the mean significant wave height calculated from a 20-year wave hindcast	dm/s
95th percentile peak bed orbital velocity	Orb_vel_95	Orbital velocity at the bed for the 95th percentile significant wave height calculated from a 20-year wave hindcast	Cm/s
Depth averaged maximum tidal current	Tidcurmax1	Depth averaged maximum tidal current	m/s