Table 3.

Photosynthetic parameters from ice station 1–3: rETR_max (${\varphi }_{\text{PSII}}^{\prime }$ × E_PAR), ${\alpha }_{\text{ETR}}$, ${\varphi }_{\text{PSII - max}}^{\prime }$, E_k (μmol m⁻² s⁻¹) and non-photosynthetic quenching (NPQ) of phytoplankton

Station	Depth (m)	rETRmax (± SE)	${\alpha }_{\text{ETR}}$ (± SE)	R 2	${\varphi }_{\text{PSII - max}}^{\prime }$	E k	NPQ EPAR = 180	NPQ EPAR = 500
1	2	105 ± 7.1	0.69 ± 0.10	0.88	0.60 ± 0.01	152 ± 24.3	0.35 ± 0.03	1.47 ± 0.20
	10	99 ± 7.6	0.64 ± 0.10	0.85	0.62 ± 0.01	155 ± 27.0	0.23 ± 0.07	0.81 ± 0.08
2	2	144 ± 20.8	0.59 ± 0.11	0.79	0.61 ± 0.02	244 ± 57.7	0.23 ± 0.10	1.41 ± 0.30
	10	96 ± 7.7	0.76 ± 0.15	0.80	0.62 ± 0.02	127 ± 27.0	0.89 ± 0.37	1.36 ± 0.30
	40	81 ± 5.4	0.77 ± 0.14	0.84	0.63 ± 0.02	106 ± 20.4	0.58 ± 0.16	2.06 ± 0.47
3	10	89 ± 6.1	0.87 ± 0.17	0.82	0.61 ± 0.01	103 ± 21.2	0.23 ± 0.09	0.82 ± 0.08
	45	68 ± 4.9	0.87 ± 0.20	0.78	0.61 ± 0.01	78 ± 18.9	0.43 ± 0.16	2.02 ± 0.58
Mean		97 ± 8.5	0.75 ± 0.14	0.80	0.61 ± 0.01	138 ± 28.0	0.42 ± 0.18	1.42 ± 0.36

NPQ derived from RLC curves at E_PAR of 180 μmol m⁻² s⁻¹, close to maximum E_k (mean value of 138 μmol m⁻² s⁻¹) and corresponding light-saturated photosynthesis (E_PAR of 500 μmol m⁻² s⁻¹). Standard error of average (SE, n = 3) indicated as ± after photosynthetic parameters. Station 3 is the site of AUV survey