scholarly journals Southern Ocean wind-driven entrainment enhances satellite chlorophyll-a through the summer

2015 ◽  
Vol 120 (1) ◽  
pp. 304-323 ◽  
Author(s):  
Magdalena M. Carranza ◽  
Sarah T. Gille
Keyword(s):  
Southern Ocean ◽  
Chlorophyll A ◽  
Ocean Wind ◽  
Satellite Chlorophyll

scholarly journals Quality-control tests for OC4, OC5 and NIR-red satellite chlorophyll-a algorithms applied to coastal waters

2021 ◽  
Vol 255 ◽  
pp. 112237
Author(s):  
H. Lavigne ◽  
D. Van der Zande ◽  
K. Ruddick ◽  
J.F. Cardoso Dos Santos ◽  
F. Gohin ◽  
...  
Keyword(s):  
Quality Control ◽  
Chlorophyll A ◽  
Coastal Waters ◽  
Satellite Chlorophyll

scholarly journals Using Eulerian and Lagrangian Approaches to Investigate Wind-Driven Changes in the Southern Ocean Abyssal Circulation

2013 ◽  
Vol 44 (2) ◽  
pp. 662-675 ◽  
Author(s):  
Paul Spence ◽  
Erik van Sebille ◽  
Oleg A. Saenko ◽  
Matthew H. England
Keyword(s):  
Southern Ocean ◽  
Wind Stress ◽  
Climate Model ◽  
Meridional Overturning Circulation ◽  
Global Ocean ◽  
Lagrangian Particle ◽  
Stress Changes ◽  
Abyssal Circulation ◽  
Flow Pathways ◽  
Ocean Wind

Abstract This study uses a global ocean eddy-permitting climate model to explore the export of abyssal water from the Southern Ocean and its sensitivity to projected twenty-first-century poleward-intensifying Southern Ocean wind stress. The abyssal flow pathways and transport are investigated using a combination of Lagrangian and Eulerian techniques. In an Eulerian format, the equator- and poleward flows within similar abyssal density classes are increased by the wind stress changes, making it difficult to explicitly diagnose changes in the abyssal export in a meridional overturning circulation framework. Lagrangian particle analyses are used to identify the major export pathways of Southern Ocean abyssal waters and reveal an increase in the number of particles exported to the subtropics from source regions around Antarctica in response to the wind forcing. Both the Lagrangian particle and Eulerian analyses identify transients as playing a key role in the abyssal export of water from the Southern Ocean. Wind-driven modifications to the potential energy component of the vorticity balance in the abyss are also found to impact the Southern Ocean barotropic circulation.

scholarly journals Interhemispheric gradient of atmospheric radiocarbon reveals natural variability of Southern Ocean winds

2011 ◽  
Vol 7 (1) ◽  
pp. 347-379 ◽  
Author(s):  
K. B. Rodgers ◽  
S. E. M. Fletcher ◽  
D. Bianchi ◽  
C. Beaulieu ◽  
E. D. Galbraith ◽  
...  
Keyword(s):  
Southern Ocean ◽  
Little Ice Age ◽  
Driving Forces ◽  
Ice Age ◽  
Global Maximum ◽  
Medieval Climate Anomaly ◽  
Ocean Winds ◽  
Main Driver ◽  
14Co2 Production ◽  
Ocean Wind

Abstract. Tree ring Δ14C data (Reimer et al., 2004; McCormac et al., 2004) indicate that atmospheric Δ14C varied on multi-decadal to centennial timescales, in both hemispheres, over the pre-industrial period AD 950–1830. Although the Northern and Southern Hemispheric Δ14C records display similar variability, it is difficult from these data alone to distinguish between variations driven by 14CO2 production in the upper atmosphere (Stuiver, 1980) and exchanges between carbon reservoirs (Siegenthaler, 1980). Here we consider rather the Interhemispheric Gradient in atmospheric Δ14C as revealing of the background pre-bomb air-sea Disequilbrium Flux between 14CO2 and CO2. As the global maximum of the Disequilibrium Flux is squarely centered in the open ocean regions of the Southern Ocean, relatively modest perturbations to the winds over this region drive significant perturbations to the Interhemispheric Gradient. The analysis presented here implies that changes to Southern Ocean windspeeds are likely a main driver of the observed variability in the Interhemispheric Gradient over 950–1830, and further, that this variability may be larger than the Southern Ocean wind trends that have been reported for recent decades (notably 1980–2004). This interpretation also implies a significant weakening of the winds over the Southern Ocean within a few decades of AD 1375, associated with the transition between the Medieval Climate Anomaly and the Little Ice Age. The driving forces that could have produced such a shift in the winds remain unkown.

scholarly journals The Effect of Cold and Warm Anomalies on Phytoplankton Pigment Composition in Waters off the Northern Baja California Peninsula (México): 2007–2016

2020 ◽  
Vol 8 (7) ◽  
pp. 533 ◽  
Author(s):  
Adriana González-Silvera ◽  
Eduardo Santamaría-del-Ángel ◽  
Víctor Camacho-Ibar ◽  
Jorge López-Calderón ◽  
Jonatan Santander-Cruz ◽  
...  
Keyword(s):  
Water Column ◽  
Chlorophyll A ◽  
Community Composition ◽  
High Performance ◽  
Baja California ◽  
Regional Scale ◽  
Baja California Peninsula ◽  
Phytoplankton Pigments ◽  
Entire Water Column ◽  
Satellite Chlorophyll

In this study, we report the response of phytoplankton community composition to cold and warm interannual events affecting the waters off the Baja California Peninsula from 2007 to 2016 based on data obtained from a single marine station (31.75° N/116.96° W). Included variables were satellite chlorophyll a, sea surface temperature (MODIS/Aqua), upwelling intensity, and field data (phytoplankton pigments, inorganic nutrients, light penetration). Phytoplankton pigments were determined by high performance liquid chromatography, and CHEMTAX software was used to determine the relative contributions of the main taxonomic groups to chlorophyll a. Our results confirm the decrease in phytoplankton biomass due to the influence of the recent Pacific Warm Anomaly (2014) and El Niño 2015–2016. However, this decrease was especially marked at the surface. When data from the entire water column was considered, this decrease was not significant, because at the subsurface Chla did not decrease as much. Nevertheless, significant changes in community composition occurred in the entire water column with Cyanobacteria (including Prochlorococcus) and Prymnesiophytes being dominant at the surface, while Chlorophytes and Prasinophytes made a strong contribution at the subsurface. Analysis of the spatial distribution of SST and satellite chlorophyll a made it possible to infer the spatial extension of these anomalies at a regional scale.

scholarly journals Subsurface Chlorophyll-a Maxima in the Southern Ocean

2020 ◽  
Vol 7 ◽  
Author(s):  
Kimberlee Baldry ◽  
Peter G. Strutton ◽  
Nicole A. Hill ◽  
Philip W. Boyd
Keyword(s):  
Southern Ocean ◽  
Chlorophyll A

Three improved satellite chlorophyll algorithms for the Southern Ocean

2013 ◽  
Vol 118 (7) ◽  
pp. 3694-3703 ◽  
Author(s):  
Robert Johnson ◽  
Peter G. Strutton ◽  
Simon W. Wright ◽  
Andrew McMinn ◽  
Klaus M. Meiners
Keyword(s):  
Southern Ocean ◽  
Satellite Chlorophyll
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