Table 2 A guide to standardized sampling depth intervals of CTD stations at various depths (designated bottom line in table).

	1	2	3	4	Water bottle number			8	9	10	11	12
	1	2	3	4	5	6	7	8	9	10	11	12
Sample depths (m)	50	30	20	10	5
	75	50	30	20	10	5
	100	75	50	30	20	10	5
	125	100	75	50	30	20	10	5
	150	125	100	75	50	30	20	10	5
	200	150	125	100	75	50	30	20	10	5
	250	200	150	125	100	75	50	30	20	10	5
	300	250	200	150	125	100	75	50	30	20	10	5
	400	300	250	200	150	100	75	50	30	20	10	5
	500	400	300	200	150	100	75	50	30	20	10	5
	600	500	400	300	200	150	100	75	50	30	10	5
	800	600	500	400	300	200	150	100	75	50	30	10
	1000	800	500	400	300	200	150	100	75	50	30	10
	1200	1000	800	500	400	300	200	150	100	50	30	10
	1500	1200	1000	800	500	400	300	200	100	50	30	10
	1800	1500	1200	1000	800	500	400	200	100	50	30	10
	2000	1800	1500	1000	800	500	400	200	100	50	30	10
	2500	2000	1500	1000	800	500	400	200	100	50	30	10
	3000*	2500*	2000*	1500*	1000*	800*	500*	200*	100*	50*	30*	10*

*Nominal station depth (m).
Nutrient samples (nitrate, nitrite, phosphate, silicate) are collected from the maximum number of depths at each CTD station¹², while the number of Chlorophyll-a samples (ChlA) are only collected in the upper 100 m of the water column. On dedicated cruises, Winkler DO (DOW), and particulate organic carbon and nitrogen (POC, PN) samples were collected from random depths in the upper 150 m of the water column (specific depths are not shown here).

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