Details

Autor(en) / Beteiligte

• Berelson, William
• McManus, Jim
• Coale, Kenneth
• Johnson, Ken
• Burdige, David
• Kilgore, Tammy
• Colodner, Debbie
• Chavez, Francisco
• Kudela, Rafael
• Boucher, Joceline

Titel

A time series of benthic flux measurements from Monterey Bay, CA

Ist Teil von

• Continental shelf research, 2003-03, Vol.23 (5), p.457-481

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2003

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• In situ incubation chamber measurements of benthic nutrient recycling rates were made on the Monterey Bay shelf at 100 m during various years and seasons. Variability in nutrient (Si, PO 4 2+, NH 3, NO 3 −) and trace metal (Mn, Fe (II), Cu) fluxes correlate with variability in the amount of organic carbon oxidized on the sea floor. Patterns of primary productivity show a mid-year maxima, consistent with the timing of increased rates of benthic C org and opal recycling. High rates of C org rain to the shelf promote nitrate consumption at a rate that equals or exceeds ammonia efflux. Low rates of C org rain promote greater efflux of DIN; thus these margin sediments provide a negative feedback to local productivity cycles. The efflux of iron (II) from shelf sediments is sufficient to support >100% of new production, yet Fe flux is positively correlated with C org recycling which lags the maximum in new production. On account of this time lag, diagenetically recycled Fe is not likely a micro-nutrient trigger of new production, but could serve as a positive feedback. Bio-irrigation rates are seasonally variable by 30% but maximal during the maximum productivity months.