scholarly journals Comment on "Dilution limits dissolved organic carbon utilization in the deep ocean"

Science ◽  
2015 ◽  
Vol 350 (6267) ◽  
pp. 1483-1483 ◽  
Author(s):  
N. Jiao ◽  
L. Legendre ◽  
C. Robinson ◽  
H. Thomas ◽  
Y.-W. Luo ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Deep Ocean ◽  
Carbon Utilization

scholarly journals Response to Comment on "Dilution limits dissolved organic carbon utilization in the deep ocean"

Science ◽  
2015 ◽  
Vol 350 (6267) ◽  
pp. 1483-1483 ◽  
Author(s):  
J. M. Arrieta ◽  
E. Mayol ◽  
R. L. Hansman ◽  
G. J. Herndl ◽  
T. Dittmar ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Deep Ocean ◽  
Carbon Utilization

Dilution limits dissolved organic carbon utilization in the deep ocean

Science ◽  
2015 ◽  
Vol 348 (6232) ◽  
pp. 331-333 ◽  
Author(s):  
J. M. Arrieta ◽  
E. Mayol ◽  
R. L. Hansman ◽  
G. J. Herndl ◽  
T. Dittmar ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Deep Ocean ◽  
Carbon Utilization

scholarly journals Hidden cycle of dissolved organic carbon in the deep ocean

2014 ◽  
Vol 111 (47) ◽  
pp. 16706-16711 ◽  
Author(s):  
Christopher L. Follett ◽  
Daniel J. Repeta ◽  
Daniel H. Rothman ◽  
Li Xu ◽  
Chiara Santinelli
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Deep Ocean

scholarly journals The Seasonal Flux and Fate of Dissolved Organic Carbon Through Bacterioplankton in the Western North Atlantic

2021 ◽  
Vol 12 ◽  
Author(s):  
Nicholas Baetge ◽  
Michael J. Behrenfeld ◽  
James Fox ◽  
Kimberly H. Halsey ◽  
Kristina D. A. Mojica ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
North Atlantic ◽  
Phytoplankton Bloom ◽  
North Atlantic Ocean ◽  
Net Primary Production ◽  
Deep Ocean ◽  
Carbon Demand ◽  
Carbon Pump ◽  
Biological Carbon Pump

The oceans teem with heterotrophic bacterioplankton that play an appreciable role in the uptake of dissolved organic carbon (DOC) derived from phytoplankton net primary production (NPP). As such, bacterioplankton carbon demand (BCD), or gross heterotrophic production, represents a major carbon pathway that influences the seasonal accumulation of DOC in the surface ocean and, subsequently, the potential vertical or horizontal export of seasonally accumulated DOC. Here, we examine the contributions of bacterioplankton and DOM to ecological and biogeochemical carbon flow pathways, including those of the microbial loop and the biological carbon pump, in the Western North Atlantic Ocean (∼39–54°N along ∼40°W) over a composite annual phytoplankton bloom cycle. Combining field observations with data collected from corresponding DOC remineralization experiments, we estimate the efficiency at which bacterioplankton utilize DOC, demonstrate seasonality in the fraction of NPP that supports BCD, and provide evidence for shifts in the bioavailability and persistence of the seasonally accumulated DOC. Our results indicate that while the portion of DOC flux through bacterioplankton relative to NPP increased as seasons transitioned from high to low productivity, there was a fraction of the DOM production that accumulated and persisted. This persistent DOM is potentially an important pool of organic carbon available for export to the deep ocean via convective mixing, thus representing an important export term of the biological carbon pump.

Deep-ocean gradients in the concentration of dissolved organic carbon

Nature ◽  
10.1038/26200 ◽  
1998 ◽  
Vol 395 (6699) ◽  
pp. 263-266 ◽  
Author(s):  
Dennis A. Hansell ◽  
Craig A. Carlson
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Deep Ocean

scholarly journals Localized refractory dissolved organic carbon sinks in the deep ocean

2013 ◽  
Vol 27 (3) ◽  
pp. 705-710 ◽  
Author(s):  
Dennis A. Hansell ◽  
Craig A. Carlson
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Deep Ocean ◽  
Carbon Sinks

Mercury isotopes track the cause of carbon perturbations in the Ediacaran ocean

Geology ◽  
2020 ◽  
Author(s):  
Haifeng Fan ◽  
Xuewu Fu ◽  
Jack F. Ward ◽  
Runsheng Yin ◽  
Hanjie Wen ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Carbon Isotope ◽  
Marine Sediments ◽  
South China ◽  
South Australia ◽  
Deep Ocean ◽  
Isotope Data ◽  
Carbonate Carbon ◽  
Terrestrial Input

The unusual carbon biogeochemical cycling that occurred in the Ediacaran (ca. 635–541 Ma) ocean may have been critical for ocean oxygenation and Ediacaran life evolution. However, the triggers of the peculiar Ediacaran carbonate carbon isotope (δ13Ccarb) excursions are not well understood. Because mercury (Hg) has a strong affinity for organic carbon, we measured Hg isotope compositions (δ202Hg and Δ199Hg) from Ediacaran marine sediments of South China and South Australia to better understand the causes of the Ediacaran δ13Ccarb excursions. During two local positive δ13Ccarb excursions in the Doushantuo Formation, gradually decreasing Δ199Hg and increasing δ202Hg trends are primarily ascribed to enhanced terrestrial input. Decreasing δ202Hg in both the Doushantuo and Wonoka Formations during the latter part of the Shuram negative δ13Ccarb excursion demonstrates the significant, and potentially widespread, contribution of upwelling Hg associated with dissolved organic carbon (Hg-DOC) from the open deep ocean. New Hg isotope data also suggest that a large Hg-DOC reservoir may have been present in the open ocean continuously from the early to mid–late Ediacaran Period (ca. 635–551 Ma), buffering ocean oxygenation at that time.

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