New chemical, bio‐optical and physical observations of upper ocean response to the passage of a mesoscale eddy off Bermuda

McNeil, J.; Jannasch, Holger W.; Dickey, T. D.; McGillicuddy, Dennis J.; Brzezinski, Mark A.; Sakamoto, Carole M.

doi:10.1029/1999jc900137

Cited by 113 publications

(94 citation statements)

References 35 publications

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“…In contrast to cyclones in the Sargasso Sea and in the lee of Hawaii, Sargasso Sea MWEs have a tendency to contain significant numbers of diatoms, regardless of eddy age (McGillicuddy et al, 2007;McNeil et al, 1999;Sweeney et al, 2003). Sustenance of longer-lasting diatom blooms inside MWEs may be due to upwelling driven by eddywind interactions described above as well as enhanced mixing caused by trapping of near-inertial motions (Kunze, 1985).…”

mentioning

confidence: 99%

Mesoscale physical–biological–biogeochemical linkages in the open ocean: An introduction to the results of the E-Flux and EDDIES programs

Benitez-Nelson

McGillicuddy

2008

Deep Sea Research Part II: Topical Studies in Oceanography

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mentioning

confidence: 99%

Mesoscale physical–biological–biogeochemical linkages in the open ocean: An introduction to the results of the E-Flux and EDDIES programs

Benitez-Nelson

McGillicuddy

2008

Deep Sea Research Part II: Topical Studies in Oceanography

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“…The ability to make high-resolution nitrate measurements in situ for extended periods of time is critical to assess the spatial and temporal variability due to natural and anthropogenic inputs in lakes, rivers, estuaries, and the ocean (McNeil et al 1999, Sakamoto et al 2004, Johnson et al 2006. The development of an in situ ultraviolet spectrophotometer (ISUS) system with high spectral resolution (<1 nm) and short response time (<1 s) was reported in 2002 (Johnson and Coletti 2002).…”

Section: Introductionmentioning

confidence: 99%

Improved algorithm for the computation of nitrate concentrations in seawater using an in situ ultraviolet spectrophotometer

Sakamoto

Johnson

Coletti

2009

Limnology & Ocean Methods

121

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Improvements in the data processing algorithm and calibration procedures have greatly increased the accuracy of nitrate measurements using an in situ ultraviolet spectrophotometer (ISUS). Two major changes in the algorithm involve application of a temperature-dependent correction to the bromide spectrum and then using the observed temperature and salinity to subtract the bromide component before fitting nitrate. By reducing the degrees of freedom in calculating nitrate concentrations, the accuracy of the ISUS instrument is substantially improved. The new algorithm was tested in environments ranging from the Southern Ocean to oligotrophic eastern Pacific seawater and found to be applicable at all temperatures and depths. The standard error of the estimate for regression between ISUS nitrate values and discrete samples measured by standard wet chemistry methods for the combined data set is reduced by greater than 2-fold (1.4 down to 0.65 µM) using the new algorithm. This corresponds to a 5-fold reduction in variance (2.0 down to 0.4 µM 2 ). Although biofouling and calibration drift remain issues for any instrument deployed in situ for long periods of time, using the measured salinity and temperature to correct the ultraviolet spectra before the nitrate calculations will reduce the impacts of these confounding processes.

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“…Considering the timing of the distinct BSi and diatom flux signals, this may indicate that the organic carbon is primarily fixed on the western side of the eddy where an intense bloom is expected (Chelton et al, 2011). Sargasso Sea ACMEs, for instance, contain significant numbers of diatoms, regardless of the age of the eddy (McNeil et al, 1999;Sweeney et al, 2003;Ewart et al, 2008). The molar C : N ratios of organic matter were unusually high in February 2010 for both trap depths (Fig.…”

Section: Production and Export Within The Surface Layer Of The Eddymentioning

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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New chemical, bio‐optical and physical observations of upper ocean response to the passage of a mesoscale eddy off Bermuda

Cited by 113 publications

References 35 publications

Mesoscale physical–biological–biogeochemical linkages in the open ocean: An introduction to the results of the E-Flux and EDDIES programs

Mesoscale physical–biological–biogeochemical linkages in the open ocean: An introduction to the results of the E-Flux and EDDIES programs

Improved algorithm for the computation of nitrate concentrations in seawater using an in situ ultraviolet spectrophotometer

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

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