scholarly journals Timing of migratory baleen whales at the Azores in relation to the North Atlantic spring bloom

2011 ◽  
Vol 440 ◽  
pp. 267-279 ◽  
Author(s):  
F Visser ◽  
KL Hartman ◽  
GJ Pierce ◽  
VD Valavanis ◽  
J Huisman
Keyword(s):  
North Atlantic ◽  
Spring Bloom ◽  
Baleen Whales ◽  
The North ◽  
The North Atlantic

scholarly journals Regulation of the Phytoplankton Heme b Iron Pool During the North Atlantic Spring Bloom

2019 ◽  
Vol 10 ◽  
Author(s):  
Evangelia Louropoulou ◽  
Martha Gledhill ◽  
Thomas J. Browning ◽  
Dhwani K. Desai ◽  
Jan-Lukas Menzel Barraqueta ◽  
...  
Keyword(s):  
North Atlantic ◽  
Spring Bloom ◽  
The North ◽  
The North Atlantic ◽  
Iron Pool

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 Net community production and export from Seaglider measurements in the North Atlantic after the spring bloom

2014 ◽  
Vol 119 (9) ◽  
pp. 6121-6139 ◽  
Author(s):  
Matthew B. Alkire ◽  
Craig Lee ◽  
Eric D'Asaro ◽  
Mary Jane Perry ◽  
Nathan Briggs ◽  
...  
Keyword(s):  
North Atlantic ◽  
Spring Bloom ◽  
Net Community Production ◽  
The North ◽  
The North Atlantic ◽  
Community Production

The carbon balance during the 1989 spring bloom in the North Atlantic Ocean, 47°N, 20°W

1992 ◽  
Vol 39 (10) ◽  
pp. 1707-1725 ◽  
Author(s):  
Michael Bender ◽  
Hugh Ducklow ◽  
John Kiddon ◽  
John Marra ◽  
John Martin
Keyword(s):  
Atlantic Ocean ◽  
North Atlantic ◽  
Carbon Balance ◽  
Spring Bloom ◽  
North Atlantic Ocean ◽  
The North ◽  
The North Atlantic

scholarly journals Spring bloom onset in the Nordic Seas

2016 ◽  
Vol 13 (11) ◽  
pp. 3485-3502 ◽  
Author(s):  
Alexandre Mignot ◽  
Raffaele Ferrari ◽  
Kjell Arne Mork
Keyword(s):  
North Atlantic ◽  
Spring Bloom ◽  
Large Fraction ◽  
Biomass Accumulation ◽  
Marine Phytoplankton ◽  
The Arctic ◽  
Nordic Seas ◽  
In Situ Data ◽  
The North ◽  
The North Atlantic

Abstract. The North Atlantic spring bloom is a massive annual growth event of marine phytoplankton, tiny free-floating algae that form the base of the ocean's food web and generates a large fraction of the global primary production of organic matter. The conditions that trigger the onset of the spring bloom in the Nordic Seas, at the northern edge of the North Atlantic, are studied using in situ data from six bio-optical floats released north of the Arctic Circle. It is often assumed that spring blooms start as soon as phytoplankton cells daily irradiance is sufficiently abundant that division rates exceed losses. The bio-optical float data instead suggest the tantalizing hypothesis that Nordic Seas blooms start when the photoperiod, the number of daily light hours experienced by phytoplankton, exceeds a critical value, independently of division rates. The photoperiod trigger may have developed at high latitudes where photosynthesis is impossible during polar nights and phytoplankton enters into a dormant stage in winter. While the first accumulation of biomass recorded by the bio-optical floats is consistent with the photoperiod hypothesis, it is possible that some biomass accumulation started before the critical photoperiod but at levels too low to be detected by the fluorometers. More precise observations are needed to test the photoperiod hypothesis.

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