Rates of particle scavenging and particulate organic carbon export estimated using 234Th as a tracer in the subtropical and equatorial Atlantic Ocean

1999 ◽  
Vol 46 (5) ◽  
pp. 885-906 ◽  
Author(s):  
Matthew A. Charette ◽  
S.Bradley Moran
Keyword(s):  
Organic Carbon ◽  
Atlantic Ocean ◽  
Particulate Organic Carbon ◽  
Equatorial Atlantic ◽  
Carbon Export ◽  
Equatorial Atlantic Ocean ◽  
Particle Scavenging

Late Quaternary Upwelling Variations in the Eastern Equatorial Atlantic Ocean as Inferred from Dinoflagellate Cysts, Planktonic Foraminifera, and Organic Carbon Content

2000 ◽  
Vol 54 (1) ◽  
pp. 58-67 ◽  
Author(s):  
Christine Höll ◽  
Sylvia Kemle-von Mücke
Keyword(s):  
Organic Carbon ◽  
Atlantic Ocean ◽  
Carbon Content ◽  
Isotope Composition ◽  
Late Quaternary ◽  
Planktonic Foraminifera ◽  
Organic Carbon Content ◽  
Equatorial Atlantic ◽  
Northern Summer ◽  
Equatorial Atlantic Ocean

Analysis of multiple proxies shows that eastern equatorial Atlantic upwelling was subdued during isotope stage 5.5, more intense during stages 4, 5.2, 5.4, and 6, and most intense early in stage 2. These findings are based on proxy measures from a core site about 600 km southwest of Liberia. The proxies include total organic carbon content, the ratio of peridinoid and oceanic organic-walled dinoflagellate cyst species, accumulation rates of calcareous dinoflagellates, estimates of sea surface paleotemperatures, the difference in stable oxygen isotope composition between two species of planktonic foraminifera that live at different water depths, and the abundance of the planktonic foraminifera Neogloboquadrina dutertrei. Most of these parameters consistently vary directly or inversely with one another. Slight discrepancies between the individual parameters show the usefulness of a multiple proxy approach to reconstruct paleoenvironments. Our data confirm that northern summer insolation strongly influences upwelling in the eastern equatorial Atlantic Ocean.

Dissolved organic carbon in the equatorial Atlantic Ocean

1995 ◽  
Vol 49 (2-3) ◽  
pp. 155-169 ◽  
Author(s):  
Catherine Thomas ◽  
Gustave Cauwet ◽  
Jean-François Minster
Keyword(s):  
Organic Carbon ◽  
Atlantic Ocean ◽  
Dissolved Organic Carbon ◽  
Equatorial Atlantic ◽  
Equatorial Atlantic Ocean

scholarly journals Uncertainties of particulate organic carbon concentrations in the mesopelagic zone of the Atlantic ocean

2021 ◽  
Vol 1 ◽  
pp. 43
Author(s):  
Paul Strubinger Sandoval ◽  
Giorgio Dall'Olmo ◽  
Keith Haines ◽  
Rafael Rasse ◽  
Jelizaveta Ross
Keyword(s):  
Organic Carbon ◽  
Atlantic Ocean ◽  
Water Column ◽  
Carbon Cycling ◽  
Particulate Organic Carbon ◽  
Sea Surface ◽  
Mesopelagic Zone ◽  
Potential Sources ◽  
Oceanic Carbon ◽  
Carbon Concentrations

Measurements of particulate organic carbon (POC) in the open ocean provide grounds for estimating oceanic carbon budgets and for modelling carbon cycling. The majority of the published POC measurements have been collected at the sea surface. Thus, POC stocks in the upper layer of the water column are relatively well constrained. However, our understanding of the POC distribution and its dynamics in deeper areas is modest due to insufficient in POC measurements. Moreover, the accuracy of published POC estimates is not always quantified, and neither is it fully understood. In this study, we determined the POC concentrations of samples collected in the upper 500 m during an Atlantic Meridional Transect and described a method for quantifying its experimental uncertainties using duplicate measurements. The analysis revealed that the medians of the total experimental uncertainties associated with our POC concentrations in the productive and mesopelagic zones were 2.5(±1.2) mg/m3 and 2.6(±0.6) mg/m3, respectively. In relative terms, these uncertainties corresponded to ~14% and ~ 35% of POC concentrations, respectively. However, despite our best efforts, we could explain only ~ 21% of the total experimental POC uncertainty. The potential sources of this unexplained portion of uncertainty are discussed.

234Th-derived particulate organic carbon export in the Prydz Bay, Antarctica

2013 ◽  
Vol 299 (1) ◽  
pp. 621-630 ◽  
Author(s):  
Hao Ma ◽  
Zhi Zeng ◽  
Jianhua He ◽  
Zhengbing Han ◽  
Wuhui Lin ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Particulate Organic Carbon ◽  
Prydz Bay ◽  
Carbon Export
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