Dynamic variability of biogeochemical ratios in the Southern California Current System

Unfiltered NO3, DIC, and O2 dynamics at CCE-2 during 2011
TitleDynamic variability of biogeochemical ratios in the Southern California Current System
Publication TypeJournal Article
Year of Publication2014
AuthorsMartz T., Send U, Ohman MD, Takeshita Y, Bresnahan P., Kim H.J, Nam S.
JournalGeophysical Research Letters
Date Published2014/04
Type of ArticleArticle
ISBN Number0094-8276
Accession NumberWOS:000334983000035
Keywordsbiogeochemistry; ocean; organic-matter; sensors

We use autonomous nitrate (NO3-), oxygen (O-2), and dissolved inorganic carbon (DIC) observations to examine the relationship between ratios of C:N:O at an upwelling site in the Southern California Current System. Mean ratios and 95% confidence intervals observed by sensors over 8 months were NO3-:O-2=-0.110.002, NO3-:DIC=0.140.001, and DIC:O-2=-0.830.01, in good agreement with Redfield ratios. Variability in the ratios on the weekly time scale is attributable to shifts in biological demand and nutrient availability and shown to exhibit a spectrum of values ranging from near 100% New Production to 100% Regenerated Production.


"Autonomous chemical sensors allow calculation of elemental uptake and remineralization ratios on time scales previously not studied at the ecosystem level. Although the long-term mean relationships agree quite well with traditional Redfield ratios, close examination of the sensor data at daily to weekly time scales reveals dynamic changes reflecting ecosystem level processes such as shifts in the f ratio or in species dominance." -- from the authors

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