Table 1 Environmental variables at the surface (SST, chlorophyll a, and nitrate), depth-integrated biological activities (primary production, nitrate [NO3−] assimilation and ammonia [NH3] oxidation) and contribution of nitrification to nitrate assimilation at each station
Station | Region | Date (local time) | SST (ºC) | Chl a (μg l−1) | Nitrate (n m) | Primary production (mmol C m−2 d−1) | NO3− assimilation (mmolN m−2 d−1) | NH3 oxidation (mmolN m−2 d−1) | Contribution of nitrification (%) |
|---|---|---|---|---|---|---|---|---|---|
1 | PEQD | Jul 3 | 28.1 | 0.33 | 4100 | 70.9 (68.2) | 10.9 (9.48) | 0.79 (0.21) | 7.22 (2.19) |
2 | PNEC | Jul 4 | 28.6 | 0.07 | <3 | 16.2 (14.1) | 1.17 (0.08) | 0.49 (n.d.) | 41.5 (0) |
3 | NPTG | Jul 6 | 28.2 | 0.09 | <3 | 28.2 (26.3) | 2.65 (0.25) | 0.22 (n.d.) | 8.13 (0) |
4 | NPTG | Jul 7 | 27.0 | 0.06 | <3 | 21.9 (18.8) | 0.38 (0.07) | 0.33 (n.d.) | 87.4 (0) |
5 | NPTG | Jul 9 | 27.3 | 0.07 | <3 | 19.8 (17.2) | 0.20 (0.07) | 0.11 (n.d.) | 56.8 (0) |
6 | NPTG | Jul 10 | 26.6 | 0.05 | <3 | 34.1 (30.6) | 0.69 (0.35) | 0.53 (0.10) | 76.2 (28.4) |
7 | NPTG | Jul 20 | 26.6 | 0.06 | <3 | 15.6 (14.1) | 0.47 (0.08) | 0.37 (n.d.) | 78.6 (0) |
8 | NPTG | Jul 21 | 24.2 | 0.07 | <3 | 26.8 (22.5) | 0.80 (0.23) | 0.32 (0.001) | 40.7 (0.55) |
9 | NPST/NPPF | Jul 23 | 17.6 | 0.22 | 305 | 40.2 (36.7) | 2.90 (1.81) | 1.71 (0.40) | 59.0 (21.9) |
10 | PSAG | Jul 24 | 12.9 | 0.25 | 9950 | 27.8 (25.8) | 2.90 (2.18) | 0.35 (0.03) | 12.1 (1.52) |
11 | PSAG | Jul 25 | 12.3 | 0.96 | 7570 | 52.7 (51.6) | 9.10 (5.74) | 1.08 (0.33) | 11.9 (5.80) |
12 | PSAG | Jul 26 | 11.6 | 1.28 | 435 | 49.2 (47.5) | 7.15 (5.22) | 1.90 (0.40) | 26.6 (7.65) |
13 | BERS | Jul 28 | 10.0 | 0.52 | <3 | 20.4 (18.9) | 1.33 (1.00) | 0.06 (0.02) | 4.74 (1.86) |
14 | BERS | Jul 29 | 10.3 | 0.47 | 5 | 87.8 (76.0) | 26.1 (23.8) | n.d. (n.d.) | 0 (0) |
15 | BPLR | Jul 30 | 5.6 | 0.12 | 211 | 11.0 (10.1) | 1.70 (1.54) | 0.02 (n.d.) | 1.18 (0) |
