Table 1.
Environmental properties of three water samples used in microcosm experiments. Microcosm experiments were conducted on board during the KH-14-2 cruise in May–June 2014.
| Parameters | Kuroshio Current | North Pacific Sub-polar Gyre (SPG) | North Pacific Sub-tropical Gyre (STG) | ||
|---|---|---|---|---|---|
| Surface | Surface | Chlo. Max. | Surface | Chlo. Max. | |
| Sampling location | 37.45° N 143.15° E | 47.0° N 160.0° E | 25.0° N 160.0° E | ||
| Air temperature (°C) | 11 | 3.1 | 24.5 | ||
| Water temperature (°C) | 16.6 | 3.8 | 3.7 | 25.9 | 18.8 |
| Sampling depth (m) | 5 | 5 | 37 | 5 | 125 |
| Salinity | 34.7 | 32.9 | 32.9 | 35.3 | 34.9 |
| NO3-N (μM) | ND | 21.18 | 21.42 | 0.05 | 0.48 |
| NO2-N (μM) | ND | 0.24 | 0.23 | 0.00 | 0.06 |
| NH4-N (μM) | ND | 0.13 | 0.20 | 0.00 | 0.04 |
| PO4-P (μM) | ND | 1.77 | 1.78 | 0.00 | 0.07 |
| SiO4 (μM) | ND | 35.02 | 35.31 | 1.43 | 2.57 |
| Incubation temp. (°C) | 23 ± 1 | ~ 4 | 23 ± 1 | ||
| In-situ to incubation temp. difference (°C) | + 6.4 | + 0.2 | + 0.3 | − 2.9 | + 4.2 |
Chlo. Max. chlorophyll-a maximum, Salinity salinity indicated as practical salinity unit, ND no data.