Abstract：
:The North Atlantic is characterized by diatom-dominated spring blooms that results in significant transfer of carbon to higher trophic levels and the deep ocean. These blooms are terminated by limiting silicate concentrations in summer. Numerous regional studies have demonstrated phytoplankton community shifts to lightly-silicified diatoms and non-silicifying plankton at the onset of silicate limitation. However, to understand basin-scale patterns in ecosystem and climate dynamics, nutrient inventories must be examined over sufficient temporal and spatial scales. Here we show, from a new comprehensive compilation of data from the subpolar Atlantic Ocean, clear evidence of a marked pre-bloom silicate decline of 1.5-2 µM throughout the winter mixed layer during the last 25 years. This silicate decrease is primarily attributed to natural multi-decadal variability through decreased winter convection depths since the mid-1990s, a weakening and retraction of the subpolar gyre and an associated increased influence of nutrient-poor water of subtropical origin. Reduced Arctic silicate import and the projected hemispheric-scale climate change-induced weakening of vertical mixing may have acted to amplify the recent decline. These marked fluctuations in pre-bloom silicate inventories will likely have important consequences for the spatial and temporal extent of diatom blooms, thus impacting ecosystem productivity and ocean-atmosphere climate dynamics.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Hátún H,Azetsu-Scott K,Somavilla R,Rey F,Johnson C,Mathis M,Mikolajewicz U,Coupel P,Tremblay JÉ,Hartman S,Pacariz SV,Salter I,Ólafsson Jdoi
10.1038/s41598-017-14837-4subject
Has Abstractpub_date
2017-11-06 00:00:00pages
14576issue
1issn
2045-2322pii
10.1038/s41598-017-14837-4journal_volume
7pub_type
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