One-third of Southern Ocean productivity is supported by dust deposition.

Autor: Weis, Jakob, Chase, Zanna, Schallenberg, Christina, Strutton, Peter G., Bowie, Andrew R., Fiddes, Sonya L.
Zdroj: Nature; May2024, Vol. 629 Issue 8012, p603-608, 6p
Abstrakt: Natural iron fertilization of the Southern Ocean by windblown dust has been suggested to enhance biological productivity and modulate the climate1–3. Yet, this process has never been quantified across the Southern Ocean and at annual timescales4,5. Here we combined 11 years of nitrate observations from autonomous biogeochemical ocean profiling floats with a Southern Hemisphere dust simulation to empirically derive the relationship between dust-iron deposition and annual net community production (ANCP) in the iron-limited Southern Ocean. Using this relationship, we determined the biological response to dust-iron in the pelagic perennially ice-free Southern Ocean at present and during the last glacial maximum (LGM). We estimate that dust-iron now supports 33% ± 15% of Southern Ocean ANCP. During the LGM, when dust deposition was 5–40-fold higher than today, the contribution of dust to Southern Ocean ANCP was much greater, estimated at 64% ± 13%. We provide quantitative evidence of basin-wide dust-iron fertilization of the Southern Ocean and the potential magnitude of its impact on glacial–interglacial timescales, supporting the idea of the important role of dust in the global carbon cycle and climate6–8.Nitrate observations over 11 years from autonomous biogeochemical ocean profiling combined with a Southern Hemisphere dust simulation find that iron supplied by dust supports about 30% of Southern Ocean productivity. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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