scholarly journals Particle Flux in the Deep Sargasso Sea: The 35-Year Oceanic Flux Program Time Series

Oceanography ◽  
2014 ◽  
Vol 27 (1) ◽  
pp. 142-147 ◽  
Author(s):  
Maureen Conte ◽  
JC Weber
Keyword(s):  
Time Series ◽  
Particle Flux ◽  
Sargasso Sea

Seasonal variability in primary production and particle flux in the northwestern Sargasso Sea: U.S. JGOFS Bermuda Atlantic time-series study

1992 ◽  
Vol 39 (7-8) ◽  
pp. 1373-1391 ◽  
Author(s):  
Steven E Lohrenz ◽  
George A Knauer ◽  
Vernon L Asper ◽  
Merritt Tuel ◽  
Anthony F Michaels ◽  
...  
Keyword(s):  
Time Series ◽  
Primary Production ◽  
Seasonal Variability ◽  
Particle Flux ◽  
Sargasso Sea ◽  
Time Series Study ◽  
Series Study

scholarly journals Autonomous, high-resolution observations of particle flux in the oligotrophic ocean

2013 ◽  
Vol 10 (8) ◽  
pp. 5517-5531 ◽  
Author(s):  
M. L. Estapa ◽  
K. Buesseler ◽  
E. Boss ◽  
G. Gerbi
Keyword(s):  
Time Series ◽  
High Resolution ◽  
Particle Flux ◽  
Sediment Traps ◽  
Sargasso Sea ◽  
Time Resolved ◽  
Time Series Study ◽  
Different Depths ◽  
Particle Export ◽  
Series Study

Abstract. Observational gaps limit our understanding of particle flux attenuation through the upper mesopelagic because available measurements (sediment traps and radiochemical tracers) have limited temporal resolution, are labor-intensive, and require ship support. Here, we conceptually evaluate an autonomous, optical proxy-based method for high-resolution observations of particle flux. We present four continuous records of particle flux collected with autonomous profiling floats in the western Sargasso Sea and the subtropical North Pacific, as well as one shorter record of depth-resolved particle flux near the Bermuda Atlantic Time-series Study (BATS) and Oceanic Flux Program (OFP) sites. These observations illustrate strong variability in particle flux over very short (~1-day) timescales, but at longer timescales they reflect patterns of variability previously recorded during sediment trap time series. While particle flux attenuation at BATS/OFP agreed with the canonical power-law model when observations were averaged over a month, flux attenuation was highly variable on timescales of 1–3 days. Particle fluxes at different depths were decoupled from one another and from particle concentrations and chlorophyll fluorescence in the immediately overlying surface water, consistent with horizontal advection of settling particles. We finally present an approach for calibrating this optical proxy in units of carbon flux, discuss in detail the related, inherent physical and optical assumptions, and look forward toward the requirements for the quantitative application of this method in highly time-resolved studies of particle export and flux attenuation.

Concurrent high resolution bio-optical and physical time series observations in the Sargasso Sea during the spring of 1987

1991 ◽  
Vol 96 (C5) ◽  
pp. 8643 ◽  
Author(s):  
T. Dickey ◽  
J. Marra ◽  
T. Granata ◽  
C. Langdon ◽  
M. Hamilton ◽  
...  
Keyword(s):  
Time Series ◽  
High Resolution ◽  
Sargasso Sea ◽  
Physical Time

scholarly journals A Time Series of Water Column Distributions and Sinking Particle Flux of Pseudo-Nitzschia and Domoic Acid in the Santa Barbara Basin, California

Toxins ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 480 ◽  
Author(s):  
Blaire Umhau ◽  
Claudia Benitez-Nelson ◽  
Clarissa Anderson ◽  
Kelly McCabe ◽  
Christopher Burrell
Keyword(s):  
Time Series ◽  
Water Column ◽  
Sediment Trap ◽  
Domoic Acid ◽  
Particle Flux ◽  
Sediment Traps ◽  
Benthic Organisms ◽  
Santa Barbara ◽  
Santa Barbara Basin ◽  
Potential Source

Water column bulk Pseudo-nitzschia abundance and the dissolved and particulate domoic acid (DA) concentrations were measured in the Santa Barbara Basin (SBB), California from 2009–2013 and compared to bulk Pseudo-nitzschia cell abundance and DA concentrations and fluxes in sediment traps moored at 147 m and 509 m. Pseudo-nitzschia abundance throughout the study period was spatially and temporally heterogeneous (<200 cells L−1 to 3.8 × 106 cells L−1, avg. 2 × 105 ± 5 × 105 cells L−1) and did not correspond with upwelling conditions or the total DA (tDA) concentration, which was also spatially and temporally diverse (<1.3 ng L−1 to 2.2 × 105 ng L−1, avg. 7.8 × 103 ± 2.2 × 104 ng L−1). We hypothesize that the toxicity is likely driven in part by specific Pseudo-nitzschia species as well as bloom stage. Dissolved (dDA) and particulate (pDA) DA were significantly and positively correlated (p < 0.01) and both comprised major components of the total DA pool (pDA = 57 ± 35%, and dDA = 42 ± 35%) with substantial water column concentrations (>1000 cells L−1 and tDA = 200 ng L−1) measured as deep as 150 m. Our results highlight that dDA should not be ignored when examining bloom toxicity. Although water column abundance and pDA concentrations were poorly correlated with sediment trap Pseudo-nitzschia abundance and fluxes, DA toxicity is likely associated with senescent blooms that rapidly sink to the seafloor, adding another potential source of DA to benthic organisms.

scholarly journals Autonomous, high-resolution observations of particle flux in the oligotrophic ocean

2013 ◽  
Vol 10 (1) ◽  
pp. 1229-1265 ◽  
Author(s):  
M. L. Estapa ◽  
K. Buesseler ◽  
E. Boss ◽  
G. Gerbi
Keyword(s):  
High Resolution ◽  
Carbon Flux ◽  
Particle Flux ◽  
Sediment Traps ◽  
Sargasso Sea ◽  
Power Law Model ◽  
Time Resolved ◽  
Horizontal Advection ◽  
Different Depths ◽  
Particle Export

Abstract. Observational gaps limit our understanding of particle flux attenuation through the upper mesopelagic because available measurements (sediment traps and radiochemical tracers) have limited temporal resolution, are labor-intensive, and require ship support. Here, we conceptually evaluate an autonomous, optical proxy-based method for high-resolution observations of particle flux. We present four continuous records of particle flux collected with autonomous, profiling floats in the western Sargasso Sea and the subtropical North Pacific, as well as one shorter record of depth-resolved particle flux near the Bermuda Atlantic Timeseries Study (BATS) and Oceanic Flux Program (OFP) sites. These observations illustrate strong variability in particle flux over very short (~1 day) timescales, but at longer timescales they reflect patterns of variability previously recorded during sediment trap timeseries. While particle flux attenuation at BATS/OFP agreed with the canonical power-law model when observations were averaged over a month, flux attenuation was highly variable on timescales of 1–3 days. Particle fluxes at different depths were decoupled from one another and from particle concentrations and chlorophyll fluorescence in the immediately-overlying surface water, consistent with horizontal advection of settling particles. We finally present an approach for calibrating this optical proxy in units of carbon flux, discuss in detail the related, inherent physical and optical assumptions, and look forward toward the requirements for the quantitative application of this method in highly time-resolved studies of particle export and flux attenuation.

Time series observations of bio-optical properties in the upper layer of the Sargasso Sea

1990 ◽  
Author(s):  
Tom D. Dickey ◽  
Timothy C. Granata ◽  
Michael Hamilton ◽  
Jerry Wiggert ◽  
John Marra ◽  
...  
Keyword(s):  
Time Series ◽  
Optical Properties ◽  
Sargasso Sea
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