Journal
MARINE CHEMISTRY
Volume 121, Issue 1-4, Pages 157-166Publisher
ELSEVIER
DOI: 10.1016/j.marchem.2010.04.004
Keywords
Bering Sea; Nutrient cycle; Nitrite; Nitrogen cycle; Nitrification; Denitrification
Categories
Funding
- NOAA
- NOAA's Alaska Fisheries Science Center
- North Pacific Research Board [517, 602, 701]
- Arctic Yukon Kuskokwim Sustainable Salmon Initiative (AYKSSI)
- NSF [ARC0612380]
- Joint Institute for the Study of the Atmosphere and Ocean (JISAO) under NOAA [NA17RJ1232]
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An unprecedented pool of nitrite (2-5.6 mu M) was observed in the well-oxygenated, ammonium-rich bottom waters of Bering Sea middle shelf in fall 2005 on two simultaneous oceanographic cruises. This nitrite pool was located in a transition zone that separated the ice-derived cold pool to the north from warmer waters to the south. The transition zone was influenced by on-shelf flow. The nitrite pool was transitory; it was not apparent 11 days after it was first observed. Several origins of the pool were considered including: truncation of sedimentary denitrification and/or curtailment of anammox (these are dominate pathways in the nitrogen cycle of the Bering Sea), nitrite release from light-limited phytoplankton (light and nutrient conditions were favorable for this mechanism), and truncation of water column nitrification (there was a small decrease of ammonium in the vicinity of the nitrite pool). The occurrence of this pool suggests a temporary uncoupling of the marine nitrogen cycle. (C) 2010 Elsevier B.V. All rights reserved.
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