Benthic community respiration in the N.W. Atlantic Ocean: in situ measurements from 40 to 5200 m

1978 ◽  
Vol 47 (4) ◽  
pp. 337-347 ◽  
Author(s):  
K. L. Smith
Keyword(s):  
Atlantic Ocean ◽  
Benthic Community ◽  
In Situ Measurements ◽  
Community Respiration

Influence of water circulation rate on in situ measurements of benthic community respiration

1981 ◽  
Vol 65 (2) ◽  
pp. 185-190 ◽  
Author(s):  
W. R. Boynton ◽  
W. M. Kemp ◽  
C. G. Osborne ◽  
K. R. Kaumeyer ◽  
M. C. Jenkins
Keyword(s):  
Benthic Community ◽  
In Situ Measurements ◽  
Water Circulation ◽  
Community Respiration ◽  
Circulation Rate ◽  
Influence Of Water

Deep-Sea Benthic Community Respiration: An in situ Study at 1850 Meters

Science ◽  
1973 ◽  
Vol 179 (4070) ◽  
pp. 282-283 ◽  
Author(s):  
K. L. Smith ◽  
J. M. Teal
Keyword(s):  
Deep Sea ◽  
Benthic Community ◽  
Community Respiration ◽  
In Situ Study

scholarly journals Bio-optical provinces in the eastern Atlantic Ocean and their biogeographical relevance

2011 ◽  
Vol 8 (12) ◽  
pp. 3609-3629 ◽  
Author(s):  
B. B. Taylor ◽  
E. Torrecilla ◽  
A. Bernhardt ◽  
M. H. Taylor ◽  
I. Peeken ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Atlantic Ocean ◽  
Large Scale ◽  
Chlorophyll Concentration ◽  
Remote Sensing Data ◽  
In Situ Measurements ◽  
High Spectral Resolution ◽  
Phytoplankton Assemblages ◽  
Eastern Atlantic Ocean

Abstract. The relationship between phytoplankton assemblages and the associated optical properties of the water body is important for the further development of algorithms for large-scale remote sensing of phytoplankton biomass and the identification of phytoplankton functional types (PFTs), which are often representative for different biogeochemical export scenarios. Optical in-situ measurements aid in the identification of phytoplankton groups with differing pigment compositions and are widely used to validate remote sensing data. In this study we present results from an interdisciplinary cruise aboard the RV Polarstern along a north-to-south transect in the eastern Atlantic Ocean in November 2008. Phytoplankton community composition was identified using a broad set of in-situ measurements. Water samples from the surface and the depth of maximum chlorophyll concentration were analyzed by high performance liquid chromatography (HPLC), flow cytometry, spectrophotometry and microscopy. Simultaneously, the above- and underwater light field was measured by a set of high spectral resolution (hyperspectral) radiometers. An unsupervised cluster algorithm applied to the measured parameters allowed us to define bio-optical provinces, which we compared to ecological provinces proposed elsewhere in the literature. As could be expected, picophytoplankton was responsible for most of the variability of PFTs in the eastern Atlantic Ocean. Our bio-optical clusters agreed well with established provinces and thus can be used to classify areas of similar biogeography. This method has the potential to become an automated approach where satellite data could be used to identify shifting boundaries of established ecological provinces or to track exceptions from the rule to improve our understanding of the biogeochemical cycles in the ocean.

scholarly journals Bio-optical provinces in the eastern Atlantic Ocean and their biogeographical relevance

2011 ◽  
Vol 8 (4) ◽  
pp. 7165-7219 ◽  
Author(s):  
B. B. Taylor ◽  
E. Torrecilla ◽  
A. Bernhardt ◽  
M. H. Taylor ◽  
I. Peeken ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Atlantic Ocean ◽  
Large Scale ◽  
Chlorophyll Concentration ◽  
Remote Sensing Data ◽  
In Situ Measurements ◽  
High Spectral Resolution ◽  
Phytoplankton Assemblages ◽  
Eastern Atlantic Ocean

Abstract. The relationship between phytoplankton assemblages and the associated optical properties of the water body is important for the further development of algorithms for large-scale remote sensing of phytoplankton biomass and the identification of phytoplankton functional types (PFTs), which are often representative for different biogeochemical export scenarios. Optical in-situ measurements aid in the identification of phytoplankton groups with differing pigment compositions and are widely used to validate remote sensing data. In this study we present results from an interdisciplinary cruise aboard the R/V Polarstern along a north-to-south transect in the eastern Atlantic Ocean in November 2008. Phytoplankton community composition was identified using a broad set of in-situ measurements. Water samples from the surface and the depth of maximum chlorophyll concentration were analyzed by high performance liquid chromatography (HPLC), flow cytometry, spectrophotometry and microscopy. Simultaneously, the above- and underwater light field was measured by a set of high spectral resolution (hyperspectral) radiometers. An unsupervised cluster algorithm applied to the measured parameters allowed us to define bio-optical provinces, which are compared to ecological provinces proposed elsewhere in the literature. This method has the potential to become an automated approach where satellite data could be used to identify shifting boundaries of established ecological provinces or to track exceptions from the rule to improve our understanding of the biogeochemical cycles in the ocean.

scholarly journals In situ measurements of atmospheric O2 and CO2 reveal an unexpected O2 signal over the tropical Atlantic Ocean

2017 ◽  
Vol 31 (8) ◽  
pp. 1289-1305 ◽  
Author(s):  
Penelope A. Pickers ◽  
Andrew C. Manning ◽  
William T. Sturges ◽  
Corinne Le Quéré ◽  
Sara E. Mikaloff Fletcher ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
In Situ Measurements ◽  
Tropical Atlantic ◽  
Tropical Atlantic Ocean

The Carbon:²³⁴Thorium ratios of sinking particles in the California Current Ecosystem 2: Examination of a thorium sorption, desorption, and particle transport model

2019 ◽  
Author(s):  
Michael Stukel ◽  
Thomas Kelly
Keyword(s):  
Organic Carbon ◽  
Water Column ◽  
Particulate Organic Carbon ◽  
Transport Model ◽  
California Current ◽  
In Situ Measurements ◽  
Power Law Distribution ◽  
Sinking Particles ◽  
Organic Carbon Concentration

Thorium-234 (234Th) is a powerful tracer of particle dynamics and the biological pump in the surface ocean; however, variability in carbon:thorium ratios of sinking particles adds substantial uncertainty to estimates of organic carbon export. We coupled a mechanistic thorium sorption and desorption model to a one-dimensional particle sinking model that uses realistic particle settling velocity spectra. The model generates estimates of 238U-234Th disequilibrium, particulate organic carbon concentration, and the C:234Th ratio of sinking particles, which are then compared to in situ measurements from quasi-Lagrangian studies conducted on six cruises in the California Current Ecosystem. Broad patterns observed in in situ measurements, including decreasing C:234Th ratios with depth and a strong correlation between sinking C:234Th and the ratio of vertically-integrated particulate organic carbon (POC) to vertically-integrated total water column 234Th, were accurately recovered by models assuming either a power law distribution of sinking speeds or a double log normal distribution of sinking speeds. Simulations suggested that the observed decrease in C:234Th with depth may be driven by preferential remineralization of carbon by particle-attached microbes. However, an alternate model structure featuring complete consumption and/or disaggregation of particles by mesozooplankton (e.g. no preferential remineralization of carbon) was also able to simulate decreasing C:234Th with depth (although the decrease was weaker), driven by 234Th adsorption onto slowly sinking particles. Model results also suggest that during bloom decays C:234Th ratios of sinking particles should be higher than expected (based on contemporaneous water column POC), because high settling velocities minimize carbon remineralization during sinking.

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