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. 2019 Oct 2;10:2274. doi: 10.3389/fmicb.2019.02274

TABLE 1.

Environmental variables at stations where photosynthetic end-product measurements were conducted in the northern Chukchi Sea during summer 2011 and 2012.

Year Station Environmental variable
Date (dd/mm/yy) Teu (°C) Seu △σt (kg m–3) Ic (%) Zeu (m) Zm (m) NO3 + NO2 (μM) NH4 (μM) SiO2 (μM) PO4 (μM)
2011 1 02/08/2011 −0.4 31.1 2.3 50 38 5 1.74 0.56 8.96 0.81
2 03/08/2011 −0.9 29.7 4.7 <30 54 11 1.32 0.64 4.14 0.85
3 04/08/2011 −1.2 30.4 5.0 30–40 92 14 3.94 0.54 11.38 0.95
4 05/08/2011 −0.7 30.2 5.0 70–80 100 12 3.14 0.44 8.57 0.94
7 08/08/2011 −1.1 30.9 3.8 <10 87 10 3.46 0.29 9.33 1.01
9 10/08/2011 −1.1 30.9 3.3 90 79 15 4.24 0.68 9.72 1.01
11 11/08/2011 −1.2 30.7 3.0 80 60 16 2.24 0.60 6.38 0.90
13 13/08/2011 −1.4 30.5 2.6 >90 57 9 1.62 0.60 6.03 0.95
15 14/08/2011 −1.3 30.5 3.1 80 81 27 1.56 0.57 6.42 0.93
17 15/08/2011 −0.7 30.2 4.7 <10 98 13 1.94 0.46 6.59 0.88
2012 5 01/09/2012 0.0 28.9 5.1 0 68 20 1.02 0.83 4.74 0.73
13 09/08/2012 −0.8 29.5 3.7 60 65 23 1.45 0.71 5.50 0.73
19 17/08/2012 −1.1 29.8 3.7 5 43 17 1.95 0.45 6.34 0.73
26 21/08/2012 −1.0 30.3 4.6 10 51 15 3.90 0.55 12.54 0.98
30 25/08/2012 −0.6 29.5 4.7 5 65 17 2.74 1.05 6.33 0.85
36 29/08/2012 −0.4 29.3 5.5 0 68 17 1.57 0.67 5.61 0.80
40 05/08/2012 −0.6 29.4 5.5 5 76 4 2.62 0.98 5.84 0.66
42 16/08/2012 −1.4 28.5 5.2 60 41 3 0.71 0.00 15.38 0.60

Teu, water temperature averaged over the depth of the euphotic zone (Zeu); Seu, salinity averaged over Zeu; Δσt, stratification index; Ic, percent areal ice cover; PAR, photosynthetically available radiation; Zm, surface mixed layer depth; NO3 + NO2, nitrate plus nitrite concentration averaged over Zeu; SiO2, silicate concentration averaged over Zeu; PO4, phosphate concentration averaged over Zeu.