In-situ net community production (NCP) was measured on nine cruises along Line P in
the subarctic Northeast Pacific during 2007-2009 and incubation based new, regenerated
and carbon production on four cruises starting in August 2008. In-situ NCP, determined
using the O2/Ar gas ratio in the mixed layer, averaged 18.4±5.1 mmol O2 m-2 d-1 for
stations west of 130°W in June and August. In-situ NCP was nearly equivalent to 24-h
15NO3
- based euphotic zone integrated new production (New-P) with an average NCP:
New-P ratio of 1.3±0.4 that was consistent over a range of environmental conditions. The
relationship between NCP and 24-h 13C integrated production (C-PP) was variable, but
with a consistent mean NCP:C-PP ratio of 0.42±0.27 even when historical measurements
were included in the comparison. Two offshore high productivity events were observed
in the HNLC region of Line P, one centered between 134°W and 139°W and the other
west of 130°W. Only one high productivity event shows conclusive evidence of being
caused by iron deposition. / Graduate / 0416
| Identifer | oai:union.ndltd.org:uvic.ca/oai:dspace.library.uvic.ca:1828/5014 |
| Date | 29 October 2013 |
| Creators | Giesbrecht, Karina |
| Contributors | Hamme, Roberta Claire |
| Source Sets | University of Victoria |
| Language | English, English |
| Detected Language | English |
| Type | Thesis |
| Rights | Available to the World Wide Web |
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