Evidence for production and lateral transport of dissolved organic phosphorus in the eastern subtropical North Atlantic
作者： Sarah Reynolds , Claire Mahaffey , Vassil Roussenov , Richard G. Williams
DOI: 10.1002/2013GB004801
关键词:
摘要: The concentration of phosphate and dissolved organic phosphorus (DOP) is chronically low limits phytoplankton growth in the subtropical North Atlantic relative to other ocean basins. Transport DOP from productive flanks gyre its interior has been hypothesized as an important supply pathway. During a cruise eastern spring 2011, rates uptake, alkaline phosphatase activity (APA), production were measured northwest African shelf region, subtropics, tropics. Rates sixfold higher region (43 ± 41 nM d−1) subtropics (6.9 4.4 d−1). In contrast, APA was threefold (8.0 7.3 d−1), indicative enhanced utilization, (2.6 2.1 Hence, observations suggest net either consumption or near balance interior. Eddy-permitting model experiments demonstrate that (i) accounts for over half total surface waters, (ii) transported westward by combination eddy circulations, (iii) advected supports up 70% particle export much gyre. Our combined observational modeling study view horizontal transport mechanism supplying Atlantic.
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