Table 1.

Station location, sample volume, and physical and chemical characteristics of the water column at 20 m depth.

Station	Position	In situ temperature (°C)	Salinity (PSU)*	Water mass	10 μm filter concentration		Concentration factor	PO43− (μM)*	NO3− (μM)*	NO2− (μM)*	NH4+ (μM)*	Chl a (μg l−1)*
					Initial volume (l)	Final volume (ml)
S3	65°52.6′N 29°56.5′W	0.6	33.0	BPLR	100	730	137	0.408	2.895	0.133	0.29	1.0
S6	59°20.9′N 29°59.9′W	10.9	35.0	ARCT	96	850	113	0.432	5.437	0.21	0.584	1.7
S12	46°44.5′N 30°0.2′W	18.3	35.9	NADR	93	750	124	0.062	0.315	0.051	0.707	~0.2
S19	34°24.8′N 28°28.9′W	24.1	36.6	NAST	95	500	186	0.011	0.022	0.015	0.169	~0.1

^*Data from Gomez-Pereira et al. (2010).