scholarly journals Atmospheric Inputs of Iron and Manganese to Coastal Waters of the Southern California Current System: Seasonality, Santa Ana Winds, and Biogeochemical Implications

2017 ◽  
Vol 122 (11) ◽  
pp. 9230-9254 ◽  
Author(s):  
A. Félix-Bermúdez ◽  
F. Delgadillo-Hinojosa ◽  
M. A. Huerta-Diaz ◽  
V. Camacho-Ibar ◽  
E. V. Torres-Delgado
Keyword(s):  
Coastal Waters ◽  
Southern California ◽  
Current System ◽  
California Current ◽  
California Current System ◽  
Santa Ana ◽  
Santa Ana Winds ◽  
Atmospheric Inputs ◽  
Iron And Manganese

scholarly journals UCYN-A/haptophyte symbioses dominate N2 fixation in the Southern California Current System

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Kendra A. Turk-Kubo ◽  
Matthew M. Mills ◽  
Kevin R. Arrigo ◽  
Gert van Dijken ◽  
Britt A. Henke ◽  
...  
Keyword(s):  
Coastal Waters ◽  
Southern California ◽  
Current System ◽  
California Current ◽  
Distribution Patterns ◽  
Biological Productivity ◽  
Fixed Nitrogen ◽  
Inorganic N ◽  
California Current System ◽  
Surface Samples

AbstractThe availability of fixed nitrogen (N) is an important factor limiting biological productivity in the oceans. In coastal waters, high dissolved inorganic N concentrations were historically thought to inhibit dinitrogen (N2) fixation, however, recent N2 fixation measurements and the presence of the N2-fixing UCYN-A/haptophyte symbiosis in nearshore waters challenge this paradigm. We characterized the contribution of UCYN-A symbioses to nearshore N2 fixation in the Southern California Current System (SCCS) by measuring bulk community and single-cell N2 fixation rates, as well as diazotroph community composition and abundance. UCYN-A1 and UCYN-A2 symbioses dominated diazotroph communities throughout the region during upwelling and oceanic seasons. Bulk N2 fixation was detected in most surface samples, with rates up to 23.0 ± 3.8 nmol N l−1 d−1, and was often detected at the deep chlorophyll maximum in the presence of nitrate (>1 µM). UCYN-A2 symbiosis N2 fixation rates were higher (151.1 ± 112.7 fmol N cell−1 d−1) than the UCYN-A1 symbiosis (6.6 ± 8.8 fmol N cell−1 d−1). N2 fixation by the UCYN-A1 symbiosis accounted for a majority of the measured bulk rates at two offshore stations, while the UCYN-A2 symbiosis was an important contributor in three nearshore stations. This report of active UCYN-A symbioses and broad mesoscale distribution patterns establishes UCYN-A symbioses as the dominant diazotrophs in the SCCS, where heterocyst-forming and unicellular cyanobacteria are less prevalent, and provides evidence that the two dominant UCYN-A sublineages are separate ecotypes.

scholarly journals Eddy properties in the Southern California Current System

2018 ◽  
Vol 68 (7) ◽  
pp. 761-777 ◽  
Author(s):  
Fanny Chenillat ◽  
Peter J. S. Franks ◽  
Xavier Capet ◽  
Pascal Rivière ◽  
Nicolas Grima ◽  
...  
Keyword(s):  
Southern California ◽  
Current System ◽  
California Current ◽  
California Current System

scholarly journals Biogeochemical Anomalies at Two Southern California Current System Moorings During the 2014–2016 Warm Anomaly‐El Niño Sequence

2019 ◽  
Vol 124 (10) ◽  
pp. 6886-6903 ◽  
Author(s):  
Laura E. Lilly ◽  
Uwe Send ◽  
Matthias Lankhorst ◽  
Todd R. Martz ◽  
Richard A. Feely ◽  
...  
Keyword(s):  
El Niño ◽  
Southern California ◽  
El Nino ◽  
Current System ◽  
California Current ◽  
California Current System ◽  
Warm Anomaly

Salinity Variations in the Southern California Current*

2005 ◽  
Vol 35 (8) ◽  
pp. 1421-1436 ◽  
Author(s):  
Niklas Schneider ◽  
Emanuele Di Lorenzo ◽  
Pearn P. Niiler
Keyword(s):  
Large Scale ◽  
Southern California ◽  
Current System ◽  
California Current ◽  
Southern California Bight ◽  
Small Scale ◽  
Climate Indices ◽  
California Current System ◽  
The Mean ◽  
Salinity Variations

Abstract Hydrographic observations southwestward of the Southern California Bight in the period 1937–99 show that temperature and salinity variations have very different interannual variability. Temperature varies within and above the thermocline and is correlated with climate indices of El Niño, the Pacific decadal oscillation, and local upwelling. Salinity variability is largest in the surface layers of the offshore salinity minimum and is characterized by decadal-time-scale changes. The salinity anomalies are independent of temperature, of heave of the pycnocline, and of the climate indices. Calculations demonstrate that long-shore anomalous geostrophic advection of the mean salinity gradient accumulates along the mean southward trajectory along the California Current and produces the observed salinity variations. The flow anomalies for this advective process are independent of large-scale climate indices. It is hypothesized that low-frequency variability of the California Current system results from unresolved, small-scale atmospheric forcing or from the ocean mesoscale upstream of the Southern California Bight.

Semiannual variability of the California Undercurrent along the Southern California Current System: A tropical generated phenomenon

2017 ◽  
Vol 122 (2) ◽  
pp. 1574-1589 ◽  
Author(s):  
Felipe Gómez-Valdivia ◽  
Alejandro Parés-Sierra ◽  
Ana Laura Flores-Morales
Keyword(s):  
Southern California ◽  
Current System ◽  
California Current ◽  
California Current System ◽  
System A
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