Table 1 Nitrogen budget for wildfire aerosol fueled Eastern Eurasian Basin phytoplankton bloom.

Eastern Eurasian Basin phytoplankton bloom 2014
Accumulated chlorophyll a (mg m⁻³)	0.7 ± 0.3^a
MLD (m)	10.0 ± 5^b
Integrated chlorophyll a (mg m⁻²)	7.0 ± 4.6
Chlorophyll a: N (mg: mmol N)	2.0 ± 2^c
N requirement (mmol N m⁻²)	3.5 ± 6.4
Total N deposition July 1–Aug 31, 2014 (mmol N m⁻²)
Standard Model	0.2 ± 0.4
Inclusion of peat biomass	0.7 ± 1.4^d
Base deposition estimate (Inclusion of peat fires ×2)	1.4 ± 2.8^e
High deposition estimate (Inclusion of peat fires ×5)	3.5 ± 70.0^e
N requirement met by wildfire aerosol deposition (%)
Standard Model	5.7 ± 15.5
Inclusion of peat biomass	20.0 ± 54.3
Base deposition estimate (Inclusion of peat fires ×2)	39.9 ± 108.6
High deposition estimate (Inclusion of peat fires ×5)	99.8 ± 271.5

Note: ^adetermined as difference between the average chlorophyll a concentration during the period of peak bloom (indicated in Fig. 1a shaded region) and the pre-bloom period before 7/16/2014, ^bdefined based on NABOS expeditions in the Laptev Sea (see Fig. S2), ^cestimated using in situ data collected during ICESCAPE 2010⁶⁹ and 2011⁶⁹ as well as results from ref. ⁷⁰ and ref. ⁷¹, ^dinclusion of the specificities of peat biomass, i.e., N and PM_2.5 concentrations are up to ~3.5 times higher than emissions from boreal⁸ and tropical⁶⁷ forest fires, ^e2 to 5-fold uncertainty exists in modeled deposition estimates³¹ (e.g., Figs. 2 and S7).

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