scholarly journals Relationship between Surface Dissolved Iron Inventories and Net Community Production during a Marine Heatwave in the Subarctic Northeast Pacific

2020 ◽  
Author(s):  
Robyn Taves ◽  
David J. Janssen ◽  
M. Angelica Peña ◽  
Andrew R.S. Ross ◽  
William Crawford ◽  
...  
Keyword(s):  
Net Community Production ◽  
Dissolved Iron ◽  
Northeast Pacific ◽  
Community Production

scholarly journals Physicochemical and biological controls on primary and net community production across northeast Pacific seascapes

2014 ◽  
Vol 59 (6) ◽  
pp. 2013-2027 ◽  
Author(s):  
Maria T. Kavanaugh ◽  
Steven R. Emerson ◽  
Burke Hales ◽  
Deirdre M. Lockwood ◽  
Paul D. Quay ◽  
...  
Keyword(s):  
Net Community Production ◽  
Northeast Pacific ◽  
Community Production

scholarly journals ΔO2/N2′ as a New Tracer of Marine Net Community Production: Application and Evaluation in the Subarctic Northeast Pacific and Canadian Arctic Ocean

2021 ◽  
Vol 8 ◽  
Author(s):  
Robert W. Izett ◽  
Roberta C. Hamme ◽  
Craig McNeil ◽  
Cara C. M. Manning ◽  
Annie Bourbonnais ◽  
...  
Keyword(s):  
Arctic Ocean ◽  
Mixed Layer ◽  
Vertical Mixing ◽  
Spatial Coherence ◽  
Canadian Arctic ◽  
Field Measurements ◽  
Net Community Production ◽  
Mass Spectrometers ◽  
Northeast Pacific ◽  
Community Production

We compared field measurements of the biological O2 saturation anomalies, ΔO2/Ar and ΔO2/N2, from simultaneous oceanographic deployments of a membrane inlet mass spectrometer and optode/gas tension device (GTD). Data from the Subarctic Northeast Pacific and Canadian Arctic Ocean were used to evaluate ΔO2/N2 as an alternative to ΔO2/Ar for estimates of mixed layer net community production (NCP). We observed strong spatial coherence between ΔO2/Ar and ΔO2/N2, with small offsets resulting from differences in the solubility properties of Ar and N2 and their sensitivity to vertical mixing fluxes. Larger offsets between the two tracers were observed across hydrographic fronts and under elevated sea states, resulting from the differential time-response of the optode and GTD, and from bubble dissolution in the ship’s seawater lines. We used a simple numerical framework to correct for physical sources of divergence between N2 and Ar, deriving the tracer ΔO2/N2′. Over most of our survey regions, ΔO2/N2′ provided a better analog for ΔO2/Ar, and thus more accurate NCP estimates than ΔO2/N2. However, in coastal Arctic waters, ΔO2/N2 and ΔO2/N2′ performed equally well as NCP tracers. On average, mixed layer NCP estimated from ΔO2/Ar and ΔO2/N2′ agreed to within ∼2 mmol O2 m–2 d–1, with offsets typically smaller than other errors in NCP calculations. Our results demonstrate a significant potential to derive NCP from underway O2/N2 measurements across various oceanic regions. Optode/GTD systems could replace mass spectrometers for autonomous NCP derivation under many oceanographic conditions, thereby presenting opportunities to significantly expand global NCP coverage from various underway platforms.

scholarly journals High-resolution estimates of net community production and air-sea CO2flux in the northeast Pacific

2012 ◽  
Vol 26 (4) ◽  
pp. n/a-n/a ◽  
Author(s):  
Deirdre Lockwood ◽  
Paul D. Quay ◽  
Maria T. Kavanaugh ◽  
Lauren W. Juranek ◽  
Richard A. Feely
Keyword(s):  
High Resolution ◽  
Net Community Production ◽  
Northeast Pacific ◽  
Community Production

scholarly journals Benthic buffers and boosters of ocean acidification on coral reefs

2013 ◽  
Vol 10 (7) ◽  
pp. 4897-4909 ◽  
Author(s):  
K. R. N. Anthony ◽  
G. Diaz-Pulido ◽  
N. Verlinden ◽  
B. Tilbrook ◽  
A. J. Andersson
Keyword(s):  
Ocean Acidification ◽  
Benthic Communities ◽  
Time Of Day ◽  
High Flow ◽  
Net Community Production ◽  
Reef Environment ◽  
Saturation State ◽  
Low Co2 ◽  
Coral Reef Environment ◽  
Community Production

Abstract. Ocean acidification is a threat to marine ecosystems globally. In shallow-water systems, however, ocean acidification can be masked by benthic carbon fluxes, depending on community composition, seawater residence time, and the magnitude and balance of net community production (NCP) and calcification (NCC). Here, we examine how six benthic groups from a coral reef environment on Heron Reef (Great Barrier Reef, Australia) contribute to changes in the seawater aragonite saturation state (Ωa). Results of flume studies using intact reef habitats (1.2 m by 0.4 m), showed a hierarchy of responses across groups, depending on CO2 level, time of day and water flow. At low CO2 (350–450 μatm), macroalgae (Chnoospora implexa), turfs and sand elevated Ωa of the flume water by around 0.10 to 1.20 h−1 – normalised to contributions from 1 m2 of benthos to a 1 m deep water column. The rate of Ωa increase in these groups was doubled under acidification (560–700 μatm) and high flow (35 compared to 8 cm s−1). In contrast, branching corals (Acropora aspera) increased Ωa by 0.25 h−1 at ambient CO2 (350–450 μatm) during the day, but reduced Ωa under acidification and high flow. Nighttime changes in Ωa by corals were highly negative (0.6–0.8 h−1) and exacerbated by acidification. Calcifying macroalgae (Halimeda spp.) raised Ωa by day (by around 0.13 h−1), but lowered Ωa by a similar or higher amount at night. Analyses of carbon flux contributions from benthic communities with four different compositions to the reef water carbon chemistry across Heron Reef flat and lagoon indicated that the net lowering of Ωa by coral-dominated areas can to some extent be countered by long water-residence times in neighbouring areas dominated by turfs, macroalgae and carbonate sand.

scholarly journals Seasonal patterns in Arctic planktonic metabolism (Fram Strait – Svalbard region)

2013 ◽  
Vol 10 (3) ◽  
pp. 1451-1469 ◽  
Author(s):  
R. Vaquer-Sunyer ◽  
C. M. Duarte ◽  
J. Holding ◽  
A. Regaudie-de-Gioux ◽  
L. S. García-Corral ◽  
...  
Keyword(s):  
Arctic Ocean ◽  
Early Spring ◽  
The Arctic ◽  
Fram Strait ◽  
Metabolic Rates ◽  
Net Community Production ◽  
Western Sector ◽  
The Arctic Ocean ◽  
European Arctic ◽  
Community Production

Abstract. The metabolism of the Arctic Ocean is marked by extremely pronounced seasonality and spatial heterogeneity associated with light conditions, ice cover, water masses and nutrient availability. Here we report the marine planktonic metabolic rates (net community production, gross primary production and community respiration) along three different seasons of the year, for a total of eight cruises along the western sector of the European Arctic (Fram Strait – Svalbard region) in the Arctic Ocean margin: one at the end of 2006 (fall/winter), two in 2007 (early spring and summer), two in 2008 (early spring and summer), one in 2009 (late spring–early summer), one in 2010 (spring) and one in 2011 (spring). The results show that the metabolism of the western sector of the European Arctic varies throughout the year, depending mostly on the stage of bloom and water temperature. Here we report metabolic rates for the different periods, including the spring bloom, summer and the dark period, increasing considerably the empirical basis of metabolic rates in the Arctic Ocean, and especially in the European Arctic corridor. Additionally, a rough annual metabolic estimate for this area of the Arctic Ocean was calculated, resulting in a net community production of 108 g C m−2 yr−1.

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