Vertical layer
Name
Definition
Definition
Definition
0 Surface Mixed Layer (ML) 0 m to base of surface mixed layer (MLD, defined as density >= σθ surface+ 0.125 kg m-3 0 m to base of surface mixed layer (MLD, defined as density >= σθ surface+ 0.125 kg m-3 0 m to base of surface mixed layer (MLD, defined as density >= σθ surface+ 0.125 kg m-3
1 Upper Stratified Euphotic Zone MLD to top of DCM layer MLD to top of DCM layer MLD to top of DCM layer
2 Deep Chlorophyll Maximum (DCM) Portion of Chl-a profile >= 0.35 of Chl-a max Portion of Chl-a profile >= 0.35 of Chl-a max Portion of Chl-a profile >= 0.35 of Chl-a max
3 Winter Mode Water layer Base of DCM to density of local winter MLD (σθ =26.32) Base of DCM to density of local winter MLD (σθ =26.32) Base of DCM to density of local winter MLD (σθ =26.32)
4 Ventilated Thermocline Layer 4 Base of WMW to σθ 26.50 Base of WMW to σθ 26.50 Base of WMW to σθ 26.50
5 5 σθ 26.50 to 26.70 σθ 26.50 to 26.70 σθ 26.50 to 26.70
6 6 σθ 26.70 to 26.90 σθ 26.70 to 26.90 σθ 26.70 to 26.90
7 7 σθ 26.90 to 27.10 σθ 26.90 to 27.10 σθ 26.90 to 27.10
8 8 (Deep O2 minimum) σθ 27.10 to 27.30 σθ 27.10 to 27.30 σθ 27.10 to 27.30
9 9 σθ 27.30 to 27.50 σθ 27.30 to 27.50 σθ 27.30 to 27.50
10 10 σθ 27.50 to 27.90 σθ 27.50 to 27.90 σθ 27.50 to 27.90
Season
Definition
Year 1 (ends)
Year 2 (ends)
Year 3 (ends)
Mixed MLD > DCM layer
01-Apr-2016
10-Apr-2017
05-Apr-2018
Spring MLD abruptly shoals to ~100m
31-May-2016
26-Apr-2017
26-Apr-2018
Stratified MLD shallower than top of DCM
01-Oct-2016
16-Oct-2017
01-Oct-2018
Fall First entrainment of DCM into ML
01-Dec-2016
01-Jan-2018
01-Jan-2019