Primary Productivity, Bacterial Productivity and Nitrogen Uptake in Response to Iron Enrichment during the SEEDS II

Primary productivity (PP), bacterial productivity (BP) and the uptake rates of nitrate and ammonium were measured using isotopic methods (13C, 3H, 15N) during a mesoscale iron (Fe)-enrichment experiment conducted in the western subarctic Pacific Ocean in 2004 (SEEDS II). PP increased following Fe en...

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Bibliographic Details
Main Authors: Isao Kudoa, Yoshifumi Noiria, William P. Cochlanb, Koji Suzukic, Takafumi Aramakid, Tsuneo Onoe, Yukihiro Nojirid
Other Authors: The Pennsylvania State University CiteSeerX Archives
Format: Text
Language:English
Subjects:
Phytoplankton
Heterotrophic bacteria
carbon budget
subarctic Pacific Ocean
Fe enrichment
chlorophyll a
Pacific
Subarctic
Online Access:http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.626.2345
http://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/42553/1/DSR2_56-26_2755-2766.pdf
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Summary:Primary productivity (PP), bacterial productivity (BP) and the uptake rates of nitrate and ammonium were measured using isotopic methods (13C, 3H, 15N) during a mesoscale iron (Fe)-enrichment experiment conducted in the western subarctic Pacific Ocean in 2004 (SEEDS II). PP increased following Fe enrichment, reached maximal rates 12 days after the enrichment, and then declined to the initial level on day 17. During the 23-d observation period, we observed the development and decline of the Fe-induced bloom. The surface mixed layer (SML) integrated PP increased by 3-fold, but was smaller than the 5-fold increase observed in the previous Fe-enrichment experiment conducted at almost the same location and season during 2001 (SEEDS). Nitrate uptake rates were enhanced by the Fe-enrichment but decreased after day 5, and became lower than

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