Biogeochemistry and hydrography in the eastern subtropical North Atlantic gyre. Results from the European time-series station ESTOC

Neuer, Susanne; Cianca, A.; Helmke, Peer; Freudenthal, Tim; Davenport, Robert; Meggers, Helge; Knoll, Michaela; Santana-Casiano, J. Magdalena; González‐Dávila, Melchor; Rueda, M. J.; Llinás, O.

doi:10.1016/j.pocean.2006.08.001

Cited by 92 publications

(113 citation statements)

References 85 publications

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“…The flow intensity was more variable near ESTOC (0.02-0.07 m s −1 ), where the current was directed southwest during most of the year except between March and April, when u was eastward, and during the transition from spring to summer (May-July) when v was northward. This pattern is consistent with the results described by Neuer et al (2007) and Pelegrí et al (2005).…”

Section: Horizontal Advectionsupporting

confidence: 93%

“…The seasonal variability of the tracers considered in this study, in agreement with previous reports for BATS (Menzel and Ryther, 1959;Jenkins and Goldman, 1985;Marchal et al, 1996) and ESTOC (González-Dávila et al, 2003;Neuer et al, 2007;Santana-Casiano et al, 2007), is consistent with the fact that synthesis of organic matter occurs in the euphotic layer and that this matter is remineralized, at least partially, in the shallow aphotic zone between 100-250 m. In order to quantify the contribution of the biological processes and the physical forcing to the observed seasonal variability of the chemical tracers, a 1-D diagnostic model was implemented.…”

supporting

confidence: 93%

“…The calculated geostrophic flow for BATS (0.02-0.04 m s −1 ) was directed southwest during the whole year (see Fig. 2), consistent with the fact that BATS is influenced by the Gulf Stream recirculation (Siegel and Deuser, 1997;Ono et al, 2001). The flow intensity was more variable near ESTOC (0.02-0.07 m s −1 ), where the current was directed southwest during most of the year except between March and April, when u was eastward, and during the transition from spring to summer (May-July) when v was northward.…”

Section: Horizontal Advectionsupporting

confidence: 77%

“…Two time-series stations, BATS (Bermuda Atlantic Time-series Study, 31.7 • N-64.2 • W) and ESTOC (European Station for Time series in the Ocean, Canary Islands,29.16 • N-15.5 • W), are located at about the same latitude in the western (NASW) and eastern (NASE) portions of NASG. The monthly sampling program was initiated in October 1988 at BATS andin February 1994 at ESTOC, with the aim of tracking seasonal, inter-annual and inter-decadal changes in several biogeochemical variables (Steinberg et al, 2001;Neuer et al, 2007). Although both stations exhibit typical oligotrophic characteristics, they are characterized by different hydrographic dynamics.…”

Section: Introductionmentioning

confidence: 99%

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Regional differences in modelled net production and shallow remineralization in the North Atlantic subtropical gyre

et al. 2012

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Abstract. We used 5-yr concomitant data of tracer distribution from the BATS (Bermuda Time-series Study) and ES-TOC (European Station for Time-Series in the Ocean, Canary Islands) sites to build a 1-D tracer model conservation including horizontal advection, and then compute net production and shallow remineralization rates for both sites. Our main goal was to verify if differences in these rates are consistent with the lower export rates of particulate organic carbon observed at ESTOC. Net production rates computed below the mixed layer to 110 m from April to December for oxygen, dissolved inorganic carbon and nitrate at BATS (1.34 ± 0.79 mol O 2 m −2 , −1.73 ± 0.52 mol C m −2 and −125±36 mmol N m −2 ) were slightly higher for oxygen and carbon compared to ESTOC (1.03 ± 0.62 mol O 2 m −2 , −1.42 ± 0.30 mol C m −2 and −213 ± 56 mmol N m −2 ), although the differences were not statistically significant. Shallow remineralization rates between 110 and 250 m computed at ESTOC (−3.9 ± 1.0 mol O 2 m −2 , 1.53 ± 0.43 mol C m −2 and 38 ± 155 mmol N m −2 ) were statistically higher for oxygen compared to BATS (−1.81 ± 0.37 mol O 2 m −2 , 1.52 ± 0.30 mol C m −2 and 147 ± 43 mmol N m −2 ). The lateral advective flux divergence of tracers, which was more significant at ESTOC, was responsible for the differences in estimated oxygen remineralization rates between both stations. According to these results, the differences in net production and shallow remineralization cannot fully explain the differences in the flux of sinking organic matter observed between both stations, suggesting an additional consumption of nonsinking organic matter at ESTOC.

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Section: Horizontal Advectionsupporting

confidence: 93%

supporting

confidence: 93%

Section: Horizontal Advectionsupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

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Regional differences in modelled net production and shallow remineralization in the North Atlantic subtropical gyre

et al. 2012

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“…Time-series particle flux studies have been performed in many ocean areas, including typical oligotrophic settings in the Atlantic and the Pacific (Karl et al, 1996;Neuer et al, 2007;Lampitt and Antia, 1997;Honjo et al, 2008) and in eastern boundary upwelling ecosystems (EBUEs, Freon et al, 2009) Romero et al, 2002). In general, seasonality is low in areas with low primary production, while it increases towards coastal and open ocean high production (equatorial, polar) settings (Berger and Wefer, 1990;Romero and Armand, 2010).…”

Section: Introductionmentioning

confidence: 99%

Bathypelagic particle flux signatures from a suboxic eddy in the oligotrophic tropical North Atlantic: production, sedimentation and preservation

et al. 2016

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The lithogenic ballasting obviously resulted in high particle settling rates and, thus, a fast transfer of epi-/mesopelagic signatures to the bathypelagic traps. We suspect that the two-to three-fold increase in particle fluxes with depth as well as the tight coupling of mineral dust and organic carbon in the deep trap samples might be explained by particle focusing processes within the deeper part of the eddy. Molar C : N ratios of organic matter during the ACME passage were around 18 and 25 for the upper and lower trap samples, respectively. This suggests that some productivity under nutrient (nitrate) limitation occurred in the euphotic zone of the eddy in the beginning of 2010 or that a local nitrogen recycling took place. The δ 15 N record showed a decrease from 5

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Net community production in the North Atlantic Ocean derived from Volunteer Observing Ship data

Ostle

Johnson

Landschützer

et al. 2015

Global Biogeochemical Cycles

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The magnitude of marine plankton net community production (NCP) is indicative of both the biologically driven exchange of carbon dioxide between the atmosphere and the surface ocean and the export of organic carbon from the surface ocean to the ocean interior. In this study the seasonal variability in the NCP of five biogeochemical regions in the North Atlantic was determined from measurements of surface water dissolved oxygen and dissolved inorganic carbon (DIC) sampled from a Volunteer Observing Ship (VOS). The magnitude of NCP derived from dissolved oxygen measurements (NCP O 2 ) was consistent with previous geochemical estimates of NCP in the North Atlantic, with an average annual NCP O 2 of 9.5 ± 6.5 mmol O 2 m −2 d −1 . Annual NCP O 2 did not vary significantly over 35• of latitude and was not significantly different from NCP derived from DIC measurements (NCP DIC ). The relatively simple method described here is applicable to any VOS route on which surface water dissolved oxygen concentrations can be accurately measured, thus providing estimates of NCP at higher spatial and temporal resolution than currently achieved.

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Biogeochemistry and hydrography in the eastern subtropical North Atlantic gyre. Results from the European time-series station ESTOC

Cited by 92 publications

References 85 publications

Regional differences in modelled net production and shallow remineralization in the North Atlantic subtropical gyre

Regional differences in modelled net production and shallow remineralization in the North Atlantic subtropical gyre

Bathypelagic particle flux signatures from a suboxic eddy in the oligotrophic tropical North Atlantic: production, sedimentation and preservation

Net community production in the North Atlantic Ocean derived from Volunteer Observing Ship data

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