2021/01/08 by Jens Terhaar, Ronny Lauerwald, Pierre Regnier +2 · 1 voice · 2 citations
Earth and Planetary Sciences · Environmental Science · #Arctic and Antarctic ice dynamics #Climate change and permafrost #Methane Hydrates and Related Phenomena
paper · pdf · doi:10.1038/s41467-020-20470-z
openalex publication_date 2021/01/08 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/03
Net primary production (NPP) is the foundation of the oceans' ecosystems and the fisheries they support. In the Arctic Ocean, NPP is controlled by a complex interplay of light and nutrients supplied by upwelling as well as lateral inflows from adjacent oceans and land. But so far, the role of the input from land by rivers and coastal erosion has not been given much attention. Here, by upscaling observations from the six largest rivers and using measured coastal erosion rates, we construct a pan-Arctic, spatio-temporally resolved estimate of the land input of carbon and nutrients to the Arctic Ocean. Using an ocean-biogeochemical model, we estimate that this input fuels 28-51% of the current annual Arctic Ocean NPP. This strong enhancement of NPP is a consequence of efficient recycling of the land-derived nutrients on the vast Arctic shelves. Our results thus suggest that nutrient input from the land is a key process that will affect the future evolution of Arctic Ocean NPP.