Publisher Correction: Coccolith-calcite Sr/Ca as a proxy for transient export production related to Saharan dust deposition in the tropical North Atlantic

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Correction to: Scientific Reports 10.1038/s41598-024-54001-3, published online 21 February 2024

The original version of this Article contained a repeated error, where all instances of the unit ‘µm’ were incorrectly given as ‘mm’.

As a result, in the Material and methodology section, under the subheading ‘Quantification of the coccolith‑Sr/Ca ratios’,

“The laboratory procedure is further described in the Supplementary Material. We present the Sr/Ca ratios determined from the bulk fraction (< 20 mm) and from the three coccolith size-fractions (> 6 mm, 3–6 mm and < 3 mm), which we compared to published data concerning the total and species-specific coccolith- and coccolith-CaCO_3_ export production from the same samples.”

now reads:

“The laboratory procedure is further described in the Supplementary Material. We present the Sr/Ca ratios determined from the bulk fraction (< 20 µm) and from the three coccolith size-fractions (> 6 µm, 3–6 µm and < 3 µm), which we compared to published data concerning the total and species-specific coccolith- and coccolith-CaCO_3_ export production from the same samples.”

Additionally, in the Results, under the subheading, ‘Coccolith CaCO_3_ size fraction separation for Sr/Ca analyses’,

“The bulk fraction (< 20 mm) overall mimicked the seasonal variation of the original coccolith sinking assemblages and related coccolith-CaCO_3_ reported by^8,17^. The small fraction (< 3 mm) was dominated (38–87%) by CaCO_3_ from deep-dwelling species Gladiolithus flabellatus and F. profunda. The intermediate (~ 3–6 mm) and large fractions (> 6 mm) were dominated by carbonate produced by Helicosphaera spp. (up to 83%) followed by Scyphosphaera apsteinii (up to 44%), Calcidiscus leptoporus (up to 19%) and Pontosphaera spp. (up to 7%).”

now reads:

“The bulk fraction (< 20 µm) overall mimicked the seasonal variation of the original coccolith sinking assemblages and related coccolith-CaCO_3_ reported by^8,17^. The small fraction (< 3 µm) was dominated (38–87%) by CaCO_3_ from deep-dwelling species Gladiolithus flabellatus and F. profunda. The intermediate (~ 3–6 µm) and large fractions (> 6 µm) were dominated by carbonate produced by Helicosphaera spp. (up to 83%) followed by Scyphosphaera apsteinii (up to 44%), Calcidiscus leptoporus (up to 19%) and Pontosphaera spp. (up to 7%).”

, And under the subheading ‘Seasonal distribution of the Sr/Ca ratios’.

“We found generally higher ranges of Sr/Ca in the large fraction (> 6 mm; 1.6–12.6), followed by the bulk (< 20 mm; 1.2–5.4) and intermediate-size fractions (3–6 mm; 0.7–5.7), and finally the small size fraction (< 3 mm) with the lowest range (1–2.5).”

now reads:

“We found generally higher ranges of Sr/Ca in the large fraction (> 6 µm; 1.6–12.6), followed by the bulk (< 20 µm; 1.2–5.4) and intermediate-size fractions (3–6 µm; 0.7–5.7), and finally the small size fraction (< 3 µm) with the lowest range (1–2.5).”

Furthermore, in the legend of Fig. 2,

“Species-specific coccolith-CaCO_3_ contribution (%) in the bulk fraction (< 20 μm) and coccolith size fractions (small < 3 mm; intermediate 3–6 mm; and large > 6 mm), from selected sediment trap M4 samples U2, U7, U12, U14, U18, U21 and U24.”

now reads:

“Species-specific coccolith-CaCO_3_ contribution (%) in the bulk fraction (< 20 μm) and coccolith size fractions (small < 3 μm; intermediate 3–6 μm; and large > 6 μm), from selected sediment trap M4 samples U2, U7, U12, U14, U18, U21 and U24.”

In the legend of Fig. 3,

“(a) Seasonal variation of the coccolith-Sr/Ca ratios in the bulk fraction (< 20 μm) and in the coccolith size fractions (small < 3 mm; intermediate 3–6 mm; large > 6 mm); (b) total coccolith- and coccolith-CaCO_3_ fluxes^8,17^ from sediment trap M4.”

now reads:

“(a) Seasonal variation of the coccolith-Sr/Ca ratios in the bulk fraction (< 20 μm) and in the coccolith size fractions (small < 3 μm; intermediate 3–6 μm; large > 6 μm); (b) total coccolith- and coccolith-CaCO_3_ fluxes^8,17^ from sediment trap M4.”

And in the legend of Fig. 4,

“(a) Normalized coccolith-Sr/Ca ratios from the bulk fraction < 20 mm (light orange line) and coccolith size fractions (small, intermediate and large size fractions—red, blue and black lines, respectively);”

now reads:

“(a) Normalized coccolith-Sr/Ca ratios from the bulk fraction < 20 μm (light orange line) and coccolith size fractions (small, intermediate and large size fractions—red, blue and black lines, respectively);”

and,

“Numbers refer to samples U2, U7, U12, U14, U18, U21 and U24, in which we performed a taxonomic analysis of the bulk fraction (< 20 mm) and of the coccolith small, intermediate, and large size fraction (shown in Fig. 2).”

now reads:

“Numbers refer to samples U2, U7, U12, U14, U18, U21 and U24, in which we performed a taxonomic analysis of the bulk fraction (< 20 μm) and of the coccolith small, intermediate, and large size fraction (shown in Fig. 2).”

in the Discussions section, under the subheading ‘Coccolith size fractions and species‑specific Sr/Ca signal’,

“Our data clearly support this, based on the much higher Sr/Ca ratios measured in the large (> 6 mm) coccolith size fractions.”

now reads:

“Our data clearly support this, based on the much higher Sr/Ca ratios measured in the large (> 6 μm) coccolith size fractions.”

and,

“According to coccolith biometric data presented in^17^, coccoliths of S. apsteinii were by far the largest coccoliths measured in samples from trap M4 (mean length of 15.24 mm), resulting in a coccolith calcite mass of 1665.06 pg. (Table IV in the Supplementary Material).”

now reads:

“According to coccolith biometric data presented in^17^, coccoliths of S. apsteinii were by far the largest coccoliths measured in samples from trap M4 (mean length of 15.24 μm), resulting in a coccolith calcite mass of 1665.06 pg. (Table IV in the Supplementary Material).”

Finally, the header row of Table 1 has been corrected.Coccolith Sr/Ca (m mol/mol) < 20 micron < 3 micron3–6 micron > 6 micron

now reads:Coccolith Sr/Ca (m mol/mol) < 20 μm < 3 μm3–6 μm > 6 μm

The original version of this Article has been corrected.