Table 1. Location, water depth along with some oceanographic and meteorological variables/parameters obtained from the sampled stations.

Station	Date mm/dd/yy		Lat. (°S)	Lon. (°W)	Water depth (m)	SST (°C)	Wind (m s−1)	Zm (m)	Surface NO3 − (µmol L−1)	Surface PO4 3− (µmol L−1)	Surface N/P ratio	N2O fix assay
BIOS GYR6	11/14/04	−26.06		−113.98	3078	23.2	2.87	189	0.05	0.06	0.83
BIOS EGYR	11/30/04	−31.90		−91.40	2996	18.3	6.47	180	0.13	0.10	1.3
BIOS 18	12/02/04	−32.66		−84.20	3760	17.5	6.40	174	3.64	0.36	10
BIOS 19	12/03/04	−32.94		−81.63	4006	17.13	2.45	128	2.74	0.36	7.6
BIOS 20	12/04/04	−33.32		−78.36	3830	17.4	3.94	125	0.92	0.30	3
BIOS 21	12/05/04	−33.58		−75.84	4374	16.8	8.57	83	0.06	0.30	0.20
BIOS UPX2	12/07/04	−34.65		−72.47	1193	12.8	8.90	40	19.48	1.30	15
KN08	10/20/05	−15.91		−74.65	1370	15.0	5.9	28	9.6	1.7	5.7	*
KN12	10/22/05	−16.28		−75.61	4100	15.9	4.17	27	10.3	1.4	7.4	*
KN20	10/25/05	−13.3		−76.99	885	15.3	6.98	6	7.4	1.9	3.8	*
KN33	10/30/05	−8.17		−80.33	328	17.4	5.76	27	8.9	1.3	7	*
KN37	11/02/05	−3.6		−83.95	3239	18.5	4.06	25	NA	NA	NA	*
G04 (14.6)	02/17/07	−20.06		−70.75	1480	21.9	NA	17	1.4	0.64	2.19	*
G05 (14.14)	02/18/07	−18.5		−71.03	1203	23.9	4.47	12	4.1	0.08	51.3	*
G09 (14.21)	02/19/07	−15.5		−75.75	3135	21.9	7.5	16	NA	0.45	NA	*
G11 (14.47)	02/21/07	−14.38		−76.42	315	17.6	8.1	30	10.7	0.82	13.0	*
G15 (14.66)	02/22/07	−13.87		−76.8	750	19.5	9.7	16	NA	NA	NA	*
G16 (14.74)	02/23/07	−14.27		76.78	789	20.0	11.5	10	6.1	0.07	87.1	*
G17 (14.86)	02/24/07	−14.01		−77.42	5153	20.9	6.7	19	4.9	0.48	10.21	*
G22 (14.100)	02/27/07	−12.43		−77.6	598	21.2	4.0	14	0.6	0.18	3.33	*
IQ08	09/22/08	−21.07		−70.27	2200	15.6	NA	10	0.07	NA	NA	*
ST 18a	2009	−36.51		−73.12	92	12.6	6.8	19	11.7	1.13	9.7	*
BR−1	11/20/11	20. 05		−70.47	1900	19.77	8.88	14	0.33	0.94	0.35	*
BR−2	11/25/11	21.10		−76.34	4695	18.0	NA	57	0.31	0.49	0.61
BR−3	11/27/11	22.15		−82.20	2572	18.0	NA	47	0,45	0.20	0.8
BR−4	12/01/11	23.27		−88.46	3941	18.7	NA	62	BLD	0.34	0.08
BR−5	12/04/11	24.33		−94.43	3402	19.7	NA	69	BLD	0.27	>0.01
BR−6	12/06/11	25.33		−100.08	3181	20.9	NA	52	BLD	0.22	>0.01
BR−7	12−09/11	26.14		−103.57	2691	21.9	4.11	41	BLD	0.18	>0.01	*

They include Sea Surface Temperature (SST), wind speed, mixing layer depth (Z_m), surface concentrations of nitrate and phosphate, surface dissolved N/P ratio.

^aCOPAS time series station. Values averaged on austral spring-summer period.

^*Denotes the stations where assimilative N₂O fixation assays were performed. BLD: Below limit of Detection; NA: Not Available.