In the published article, we detected an error in the calculated concentration of the metabolite homarine. Due to a manufacturing error in the commercial standard used in this study, we overestimated homarine concentrations by 20-fold. This compound was only quantified in the field sea-ice samples. The concentration of homarine in our field sea-ice samples (as shown in Table 2) should read 13 ± 5.3 µmol mol C−1 rather than the previously published 260 ± 110 µmol mol C−1. This also alters our calculation of the potential compatible solute-based organic nitrogen release into the sea-ice environment (Table S6) from 9.83 × 10−4 mM N to 6.17 × 10−4 mM N, which still rounds to approximately 1 mM N mentioned in the text.

The corrected Tables 2 and S6 are shown below:

Table 2.

Absolute Intracellular Concentrations of Selected Metabolites in the Nitzschia lecointei Culture Grown at −1°C and Salinity 32 and the Utqiaġvik, AK Bottom Sea-Ice Sections

Concentration (μmol mol C−1)a
CompoundCultureFieldFold Difference (Culture/Field)
DHPS 3100 ± 81 390 ± 100 
GBT 1200 ± 99 230 ± 97 
Proline 960 ± 80 180 ± 110 
Alanine 190 ± 17 120 ± 67 
Choline 61 ± 6.7 26 ± 17 
Cysteic acid 27 ± 2.2 15 ± 5.0 
Valine 24 ± 1.4 13 ± 9.5 
Histidine 14 ± 1.2 6.8 ± 4.0 
Phenylalanine 8.5 ± 0.15 4.7 ± 2.4 
Methionine 6.9 ± 0.5 12 ± 8.9 0.6 
Taurine 5.9 ± 1.1 24 ± 17 0.2 
Isoleucine 5.8 ± 0.43 2.4 ± 0.83 
Tryptophan 4.9 ± 0.2 3.0 ± 1.4 
Isethionic acid 2.9 ± 0.35 120 ± 51 0.02 
Sulfolactic acid 1.5 ± 0.61 0.72 ± 0.36 
Homarine dlb 13 ± 5.3 — 
Proline betaine ndc 13 ± 5.7 — 
Trigonelline dl 1.1 ± 0.58 — 
Hydroxyectoine nd 1.1 ± 0.44 — 
Concentration (μmol mol C−1)a
CompoundCultureFieldFold Difference (Culture/Field)
DHPS 3100 ± 81 390 ± 100 
GBT 1200 ± 99 230 ± 97 
Proline 960 ± 80 180 ± 110 
Alanine 190 ± 17 120 ± 67 
Choline 61 ± 6.7 26 ± 17 
Cysteic acid 27 ± 2.2 15 ± 5.0 
Valine 24 ± 1.4 13 ± 9.5 
Histidine 14 ± 1.2 6.8 ± 4.0 
Phenylalanine 8.5 ± 0.15 4.7 ± 2.4 
Methionine 6.9 ± 0.5 12 ± 8.9 0.6 
Taurine 5.9 ± 1.1 24 ± 17 0.2 
Isoleucine 5.8 ± 0.43 2.4 ± 0.83 
Tryptophan 4.9 ± 0.2 3.0 ± 1.4 
Isethionic acid 2.9 ± 0.35 120 ± 51 0.02 
Sulfolactic acid 1.5 ± 0.61 0.72 ± 0.36 
Homarine dlb 13 ± 5.3 — 
Proline betaine ndc 13 ± 5.7 — 
Trigonelline dl 1.1 ± 0.58 — 
Hydroxyectoine nd 1.1 ± 0.44 — 

aValues are mean ± SD, n = 3. An additional 20% error based on particulate carbon measurement may be present.

bAt or below detection limit.

cNot detected.

Table S6.

Calculation of Potential Compatible Solute-Based Organic Nitrogen Release into the Sea-Ice Environment

Nitrogen-Containing Compatible SoluteSea-Ice Bottom Measured Concentration (mmol CS/mol C)Nitrogen Atoms in CSmmol N/mol C85% Dump of N-Containing CSSea-Ice Bottom Measured mol C/L (M)CS-Derived mol N/L Estimate (mM)Sea-Ice Bottom Measured [NO32] (mM)
Proline 1.80E−01 1.00E+00 1.80E−01     
Glycine betaine 2.30E−01 1.00E+00 2.30E−01     
Homarine 1.32E−02 1.00E+00 1.32E−02     
Total   4.23E−01 3.60E−01 1.72E−03 6.17E−04 1.02E−02 
Nitrogen-Containing Compatible SoluteSea-Ice Bottom Measured Concentration (mmol CS/mol C)Nitrogen Atoms in CSmmol N/mol C85% Dump of N-Containing CSSea-Ice Bottom Measured mol C/L (M)CS-Derived mol N/L Estimate (mM)Sea-Ice Bottom Measured [NO32] (mM)
Proline 1.80E−01 1.00E+00 1.80E−01     
Glycine betaine 2.30E−01 1.00E+00 2.30E−01     
Homarine 1.32E−02 1.00E+00 1.32E−02     
Total   4.23E−01 3.60E−01 1.72E−03 6.17E−04 1.02E−02 

The originally published Tables 2 and S6 are also shown for reference:

Table 2.

Absolute Intracellular Concentrations of Selected Metabolites in the Nitzschia lecointei Culture Grown at −1°C and Salinity 32 and the Utqiaġvik, AK Bottom Sea-Ice Sections

Concentration (μmol mol C–1)a
CompoundCultureFieldFold Difference (Culture/Field)
DHPS 3100 ± 81 390 ± 100 
GBT 1200 ± 99 230 ± 97 
Proline 960 ± 80 180 ± 110 
Alanine 190 ± 17 120 ± 67 
Choline 61 ± 6.7 26 ± 17 
Cysteic acid 27 ± 2.2 15 ± 5.0 
Valine 24 ± 1.4 13 ± 9.5 
Histidine 14 ± 1.2 6.8 ± 4.0 
Phenylalanine 8.5 ± 0.15 4.7 ± 2.4 
Methionine 6.9 ± 0.5 12 ± 8.9 0.6 
Taurine 5.9 ± 1.1 24 ± 17 0.2 
Isoleucine 5.8 ± 0.43 2.4 ± 0.83 
Tryptophan 4.9 ± 0.2 3.0 ± 1.4 
Isethionic acid 2.9 ± 0.35 120 ± 51 0.02 
Sulfolactic acid 1.5 ± 0.61 0.72 ± 0.36 
Homarine dlb 260 ± 110 — 
Proline betaine ndc 13 ± 5.7 — 
Trigonelline dl 1.1 ± 0.58 — 
Hydroxyectoine nd 1.1 ± 0.44 — 
Concentration (μmol mol C–1)a
CompoundCultureFieldFold Difference (Culture/Field)
DHPS 3100 ± 81 390 ± 100 
GBT 1200 ± 99 230 ± 97 
Proline 960 ± 80 180 ± 110 
Alanine 190 ± 17 120 ± 67 
Choline 61 ± 6.7 26 ± 17 
Cysteic acid 27 ± 2.2 15 ± 5.0 
Valine 24 ± 1.4 13 ± 9.5 
Histidine 14 ± 1.2 6.8 ± 4.0 
Phenylalanine 8.5 ± 0.15 4.7 ± 2.4 
Methionine 6.9 ± 0.5 12 ± 8.9 0.6 
Taurine 5.9 ± 1.1 24 ± 17 0.2 
Isoleucine 5.8 ± 0.43 2.4 ± 0.83 
Tryptophan 4.9 ± 0.2 3.0 ± 1.4 
Isethionic acid 2.9 ± 0.35 120 ± 51 0.02 
Sulfolactic acid 1.5 ± 0.61 0.72 ± 0.36 
Homarine dlb 260 ± 110 — 
Proline betaine ndc 13 ± 5.7 — 
Trigonelline dl 1.1 ± 0.58 — 
Hydroxyectoine nd 1.1 ± 0.44 — 

aValues are mean ± SD, n = 3. An additional 20% error based on particulate carbon measurement may be present.

bAt or below detection limit.

cNot detected.

Table S6.

Calculation of Potential Compatible Solute-Based Organic Nitrogen Release into the Sea-Ice Environment

Nitrogen-Containing Compatible SoluteSea-Ice Bottom Measured Concentration (mmol CS/mol C)Nitrogen Atoms in CSmmol N/mol C85% Dump of N-Containing CSSea-Ice Bottom Measured mol C/L (M)CS-Derived mol N/L Estimate (mM)Sea-Ice Bottom Measured [NO32] (mM)
Proline 1.80E−01 1.00E+00 1.80E−01     
Glycine betaine 2.30E−01 1.00E+00 2.30E−01     
Homarine 2.64E−01 1.00E+00 2.64E−01     
Total   6.74E−01 5.73E−01 1.72E−03 9.83E−04 1.02E−02 
Nitrogen-Containing Compatible SoluteSea-Ice Bottom Measured Concentration (mmol CS/mol C)Nitrogen Atoms in CSmmol N/mol C85% Dump of N-Containing CSSea-Ice Bottom Measured mol C/L (M)CS-Derived mol N/L Estimate (mM)Sea-Ice Bottom Measured [NO32] (mM)
Proline 1.80E−01 1.00E+00 1.80E−01     
Glycine betaine 2.30E−01 1.00E+00 2.30E−01     
Homarine 2.64E−01 1.00E+00 2.64E−01     
Total   6.74E−01 5.73E−01 1.72E−03 9.83E−04 1.02E−02 
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