scholarly journals Simulated Changes in the Particulate Carbon Export Efficiency due to Diel Vertical Migration of Zooplankton in the North Atlantic

2019 ◽  
Vol 46 (10) ◽  
pp. 5387-5395 ◽  
Author(s):  
Thomas Gorgues ◽  
Olivier Aumont ◽  
Laurent Memery
Keyword(s):  
North Atlantic ◽  
Vertical Migration ◽  
Diel Vertical Migration ◽  
Particulate Carbon ◽  
Carbon Export ◽  
The North ◽  
The North Atlantic

scholarly journals Optimizing models of the North Atlantic spring bloom using physical, chemical and bio-optical observations from a Lagrangian float

2010 ◽  
Vol 7 (6) ◽  
pp. 8477-8520 ◽  
Author(s):  
W. Bagniewski ◽  
K. Fennel ◽  
M. J. Perry ◽  
E. A. D'Asaro
Keyword(s):  
North Atlantic ◽  
Spring Bloom ◽  
Deep Ocean ◽  
Complex Model ◽  
Optical Observations ◽  
Model Parameters ◽  
Carbon Export ◽  
The North ◽  
Chemical Measurements ◽  
The North Atlantic

Abstract. The North Atlantic spring bloom is one of the main events that lead to carbon export to the deep ocean and drive oceanic uptake of CO2 from the atmosphere. Here we use a suite of physical, bio-optical and chemical measurements made during the 2008 spring bloom to optimize and compare three different models of biological carbon export. The observations are from a Lagrangian float that operated south of Iceland from early April to late June, and were calibrated with ship-based measurements. The simplest model is representative of typical NPZD models used for the North Atlantic, while the most complex model explicitly includes diatoms and the formation of fast sinking diatom aggregates and cysts under silicate limitation. We carried out a variational optimization and error analysis for the biological parameters of all three models, and compared their ability to replicate the observations. The observations were sufficient to constrain most phytoplankton-related model parameters to accuracies of better than 15%. However, the lack of zooplankton observations leads to large uncertainties in model parameters for grazing. The simulated vertical carbon flux at 100 m depth is similar between models and agrees well with available observations, but at 600 m the simulated flux is much larger for the model with diatom aggregation. While none of the models can be formally rejected based on their misfit with the available observations, the model that includes export by diatom aggregation has slightly better fit to the observations and more accurately represents the mechanisms and timing of carbon export based on observations not included in the optimization. Thus models that accurately simulate the upper 100 m do not necessarily accurately simulate export to deeper depths.

scholarly journals Optimizing models of the North Atlantic spring bloom using physical, chemical and bio-optical observations from a Lagrangian float

2011 ◽  
Vol 8 (5) ◽  
pp. 1291-1307 ◽  
Author(s):  
W. Bagniewski ◽  
K. Fennel ◽  
M. J. Perry ◽  
E. A. D'Asaro
Keyword(s):  
North Atlantic ◽  
Spring Bloom ◽  
Deep Ocean ◽  
Complex Model ◽  
Optical Observations ◽  
Model Parameters ◽  
Carbon Export ◽  
The North ◽  
Chemical Measurements ◽  
The North Atlantic

Abstract. The North Atlantic spring bloom is one of the main events that lead to carbon export to the deep ocean and drive oceanic uptake of CO2 from the atmosphere. Here we use a suite of physical, bio-optical and chemical measurements made during the 2008 spring bloom to optimize and compare three different models of biological carbon export. The observations are from a Lagrangian float that operated south of Iceland from early April to late June, and were calibrated with ship-based measurements. The simplest model is representative of typical NPZD models used for the North Atlantic, while the most complex model explicitly includes diatoms and the formation of fast sinking diatom aggregates and cysts under silicate limitation. We carried out a variational optimization and error analysis for the biological parameters of all three models, and compared their ability to replicate the observations. The observations were sufficient to constrain most phytoplankton-related model parameters to accuracies of better than 15 %. However, the lack of zooplankton observations leads to large uncertainties in model parameters for grazing. The simulated vertical carbon flux at 100 m depth is similar between models and agrees well with available observations, but at 600 m the simulated flux is larger by a factor of 2.5 to 4.5 for the model with diatom aggregation. While none of the models can be formally rejected based on their misfit with the available observations, the model that includes export by diatom aggregation has a statistically significant better fit to the observations and more accurately represents the mechanisms and timing of carbon export based on observations not included in the optimization. Thus models that accurately simulate the upper 100 m do not necessarily accurately simulate export to deeper depths.

scholarly journals Silicon isotopes indicate enhanced carbon export efficiency in the North Atlantic during deglaciation

2014 ◽  
Vol 5 (1) ◽  
Author(s):  
Katharine R. Hendry ◽  
Laura F. Robinson ◽  
Jerry F. McManus ◽  
James D. Hays
Keyword(s):  
North Atlantic ◽  
Carbon Export ◽  
Silicon Isotopes ◽  
The North ◽  
The North Atlantic

Coccolithovirus facilitation of carbon export in the North Atlantic

2018 ◽  
Vol 3 (5) ◽  
pp. 537-547 ◽  
Author(s):  
Christien P. Laber ◽  
Jonathan E. Hunter ◽  
Filipa Carvalho ◽  
James R. Collins ◽  
Elias J. Hunter ◽  
...  
Keyword(s):  
North Atlantic ◽  
Carbon Export ◽  
The North ◽  
The North Atlantic

Dissolved organic carbon export and subsequent remineralization in the mesopelagic and bathypelagic realms of the North Atlantic basin

2010 ◽  
Vol 57 (16) ◽  
pp. 1433-1445 ◽  
Author(s):  
Craig A. Carlson ◽  
Dennis A. Hansell ◽  
Norman B. Nelson ◽  
David A. Siegel ◽  
William M. Smethie ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
North Atlantic ◽  
Carbon Export ◽  
Atlantic Basin ◽  
North Atlantic Basin ◽  
The North ◽  
The North Atlantic

scholarly journals Climate change has altered zooplankton-fuelled carbon export in the North Atlantic

2019 ◽  
Vol 3 (3) ◽  
pp. 416-423 ◽  
Author(s):  
Philipp Brun ◽  
Karen Stamieszkin ◽  
Andre W. Visser ◽  
Priscilla Licandro ◽  
Mark R. Payne ◽  
...  
Keyword(s):  
Climate Change ◽  
North Atlantic ◽  
Carbon Export ◽  
The North ◽  
The North Atlantic
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