Tidal and seasonal carbon and nutrients dynamics of the Guadalquivir Estuary and the Bay of Cádiz (SW Iberian Peninsula)

Abstract. To study the effects of the physical environment on carbon and nutrients cycles dynamics in the north eastern shelf of the Gulf of Cádiz, changes in currents, tides, salinity, temperature, carbon system parameters (fugacity of CO2 (fCO2), dissolved organic carbon, dissolved inorganic carbon and pH) and others related (dissolved oxygen, total dissolved nitrogen, nutrients and suspended particulate matter) were measured in transects across the Guadalquivir Estuary and Bay of Cádiz mouths. Thus, the main objective of this study is to investigate the influence of these inner ecosystems on the carbon and nutrient distributions in the adjacent continental shelf. Three cruises have been undertaken in June 2006, November 2006 and February 2007, each one covering one complete tidal cycle during June, both systems were exporting components to the adjacent continental shelf of the Gulf of Cádiz. In an annual scale, Guadalquivir Estuary exported components while Bay of Cádiz imported them. Diurnal variability of fCO2 could have a potentially important implication on the estimate of air-sea CO2 fluxes. Monthly studies should be undertaken to completely understand this dynamic system.

Download Full-text

Tidal and seasonal carbon and nutrient dynamics of the Guadalquivir estuary and the Bay of Cádiz (SW Iberian Peninsula)

Biogeosciences ◽

10.5194/bg-10-4481-2013 ◽

2013 ◽

Vol 10 (7) ◽

pp. 4481-4491 ◽

Cited By ~ 10

Author(s):

M. Ribas-Ribas ◽

E. Anfuso ◽

A. Gómez-Parra ◽

J. M. Forja

Keyword(s):

Continental Shelf ◽

Nutrient Dynamics ◽

Diurnal Changes ◽

Gulf Of Cadiz ◽

Mean Velocity ◽

Guadalquivir Estuary ◽

Gulf Of Cádiz ◽

The Mean ◽

Bay Of Cadiz ◽

Bay Of Cádiz

Abstract. To study the effects of the physical environment on carbon and nutrient cycle dynamics on the north-eastern shelf of the Gulf of Cádiz, changes in currents, tides, salinity, temperature, carbon system parameters (fugacity of CO2 (fCO2), dissolved organic carbon, dissolved inorganic carbon (DIC) and pH) and other related parameters(dissolved oxygen, total dissolved nitrogen (TDN), nutrients and suspended particulate matter) were measured in transects across the Guadalquivir estuary and Bay of Cádiz mouths. The main objective of this study is to investigate the influence of these inner ecosystems on the carbon and nutrient distributions on the adjacent continental shelf. Three cruises were undertaken in June 2006, November 2006 and February 2007. During the whole study period, Guadalquivir estuary exported components at a rate of 3 Gmol of SiO2, 4 Gmol of DIN, 3 Gmol of TDN, 31 Gmol of DOC and 604 Gmol of DIC per year. On the other hand, Bay of Cádiz imported 3 Gmol of SiO2, 1 Gmol of DIN, 2 Gmol of TDN, 33 Gmol of DOC and 562 Gmol of DIC per year. Diurnal variability of fCO2 could have a potentially important implication on the estimate of air–sea CO2 fluxes. Tides influence velocity and transport of carbon and nutrients: we found statistically significant differences (p < 0.0001, n = 220) between the flood tide (the mean velocity was 4.85 cm s–1) and the ebb tide (the mean velocity was −5.67 cm s–1). Biological activity and diurnal changes have also an important role on the carbon and nutrient dynamics. Seasonal carbon and nutrient variations were found. During June, both systems were exporting components to the adjacent continental shelf of the Gulf of Cádiz, whereas in February both systems were importing. Monthly studies should be undertaken to completely understand this dynamic system.

Download Full-text

Thrust–wrench interference tectonics in the Gulf of Cadiz (Africa–Iberia plate boundary in the North-East Atlantic): Insights from analog models

Marine Geology ◽

10.1016/j.margeo.2011.09.014 ◽

2011 ◽

Vol 289 (1-4) ◽

pp. 135-149 ◽

Cited By ~ 35

Author(s):

João C. Duarte ◽

Filipe M. Rosas ◽

Pedro Terrinha ◽

Marc-André Gutscher ◽

Jacques Malavieille ◽

...

Keyword(s):

Plate Boundary ◽

Gulf Of Cadiz ◽

East Atlantic ◽

North East ◽

The North ◽

Gulf Of Cádiz ◽

Analog Models

Download Full-text

Methane dynamics in the coastal – Continental shelf transition zone of the Gulf of Cadiz

Estuarine Coastal and Shelf Science ◽

10.1016/j.ecss.2020.106653 ◽

2020 ◽

Vol 236 ◽

pp. 106653 ◽

Cited By ~ 1

Author(s):

A. Sierra ◽

D. Jiménez-López ◽

T. Ortega ◽

M.C. Fernández-Puga ◽

A. Delgado-Huertas ◽

...

Keyword(s):

Continental Shelf ◽

Transition Zone ◽

Gulf Of Cadiz ◽

Gulf Of Cádiz ◽

Methane Dynamics

Download Full-text

Nitrous oxide distribution in the north-eastern shelf of the Gulf of Cádiz (SW Iberian Peninsula)

Marine Chemistry ◽

10.1016/j.marchem.2009.12.003 ◽

2010 ◽

Vol 119 (1-4) ◽

pp. 22-32 ◽

Cited By ~ 11

Author(s):

Sara Ferrón ◽

Teodora Ortega ◽

Jesús M. Forja

Keyword(s):

Nitrous Oxide ◽

Iberian Peninsula ◽

Gulf Of Cadiz ◽

The North ◽

North Eastern ◽

Gulf Of Cádiz ◽

Eastern Shelf

Download Full-text

Validation of CryoSat-2 SIRAL sea level data in the eastern continental shelf of the Gulf of Cadiz (Spain)

Advances in Space Research ◽

10.1016/j.asr.2017.10.042 ◽

2018 ◽

Vol 62 (6) ◽

pp. 1405-1420 ◽

Cited By ~ 6

Author(s):

J. Gómez-Enri ◽

S. Vignudelli ◽

P. Cipollini ◽

J. Coca ◽

C.J. González

Keyword(s):

Continental Shelf ◽

Sea Level ◽

Gulf Of Cadiz ◽

Level Data ◽

Gulf Of Cádiz

Download Full-text

The influence of the Guadalquivir river on spatio-temporal variability in the pelagic ecosystem of the eastern Gulf of Cádiz

Mediterranean Marine Science ◽

10.12681/mms.844 ◽

2014 ◽

Vol 15 (4) ◽

pp. 721 ◽

Cited By ~ 18

Author(s):

I. CABALLERO ◽

E. P. MORRIS ◽

L. PIETRO ◽

G. NAVARRO

Keyword(s):

Temporal Variability ◽

Phytoplankton Biomass ◽

Phytoplankton Bloom ◽

Light Limitation ◽

Gulf Of Cadiz ◽

Phytoplankton Blooms ◽

Pelagic Ecosystem ◽

Guadalquivir Estuary ◽

Gulf Of Cádiz ◽

Spatio Temporal

This study examines the spatio-temporal variability of the turbidity plume and phytoplankton biomass (in terms of chlorophyll) in the marine region influenced by the Guadalquivir estuary using ocean colour images over a period of 11 years (2003-2013). The area of the turbidity plume was calculated using water-leaving radiance at 555 nm (nLw555). Climatologic and monthly averages showed recurrent high nLw555 levels in winter and high chlorophyll in spring. Similar variability was confirmed by Empirical Orthogonal Function (EOF) analysis of 8-day composite images, illustrating the existence of different regions with similar behavior. The first EOF mode explained 60.7% and 31% of the variability in nLw555 and chlorophyll, respectively, and was associated with enhanced Total Suspended Solids (TSS) in autumn-winter and phytoplankton blooms in winter-spring periods. The results confirmed that the development of the turbidity plume and subsequent phytoplankton blooms were strongly regulated by river discharges and precipitation. Indeed, interannual variation in nLw555 was consistent with changes in the large-scale climate index, the North Atlantic Oscillation, a proxy for regional rainfall patterns. In the case of phytoplankton biomass, the second EOF mode revealed differentiation between offshore and nearshore areas, the latter characterized by delayed development of phytoplankton bloom due to light limitation by high TSS. This suggests that the stability of the water column, via its influence on phytoplankton light-limitation, influenced also the timing and magnitude of phytoplankton bloom events. The dynamic of the Guadalquivir estuary turbidity plume is a crucial factor for the pelagic ecosystem of the Eastern Gulf of Cadiz, governing phytoplankton productivity.

Download Full-text

Utility of clay Minerals in the Determination of Sedimentary Transport Patterns in the Bay of Cadiz and the Adjoining Continental Shelf (SW-Spain)

Geodinamica Acta ◽

10.3166/ga.21.259-272 ◽

2008 ◽

Vol 21 (5-6) ◽

pp. 259-272 ◽

Cited By ~ 1

Author(s):

Mohammed Achab ◽

José Manuel Gutierrez-Mas ◽

Francisco Lòpez Aguayo

Keyword(s):

Continental Shelf ◽

Clay Minerals ◽

Sw Spain ◽

Bay Of Cadiz ◽

Transport Patterns ◽

Bay Of Cádiz

Download Full-text

Reconstruction of Atlantic historical winter coastal storms in the Spanish coasts of the Gulf of Cadiz, 1929–2005

Natural Hazards and Earth System Science ◽

10.5194/nhess-11-1715-2011 ◽

2011 ◽

Vol 11 (6) ◽

pp. 1715-1722 ◽

Cited By ~ 11

Author(s):

P. Ribera ◽

D. Gallego ◽

C. Pena-Ortiz ◽

L. Del Rio ◽

T. A. Plomaritis ◽

...

Keyword(s):

Winter Season ◽

Positive Trend ◽

Gulf Of Cadiz ◽

Atlantic Sector ◽

Coastal Storms ◽

The North ◽

Gulf Of Cádiz ◽

Instrumental Period ◽

The North Atlantic Oscillation ◽

The Impact

Abstract. This paper presents the reconstruction of a climatological series of winter coastal storms on the northern coasts of the Gulf of Cadiz. This series has been put together using information extracted from regional and local Spanish newspapers. It includes all the storms coming from the Atlantic sector that have been detected during the winter season, from October to March, between 1929 and 2005. In order to validate this historical storm series, it has been compared with storms series identified from quasi-observational data and using different wave heights as thresholds to decide what is to be considered as a coastal storm. Nearly 2.6 reports per year about coastal storms are published in the press which correspond to waves of 3.6 m high or more and to prevailing winds from a direction ranging between SSW and WNW. A long- term positive trend has been detected for the complete storm series. If only the instrumental period is analysed, no significant trend is detected. It is suggested that this difference might be associated with the impact of the North Atlantic Oscillation over the occurrence of storms in this area.

Download Full-text

Clay minerals in recent sediments of the continental shelf and the Bay of Cádiz (SW Spain)

Clay Minerals ◽

10.1180/claymin.1997.032.4.02 ◽

1997 ◽

Vol 32 (4) ◽

pp. 507-515 ◽

Cited By ~ 5

Author(s):

J. M. Gutierrez-Mas ◽

A. Lopez-Galindo ◽

F. Lopez-Aguayo

Keyword(s):

Continental Shelf ◽

Clay Minerals ◽

Sediment Supply ◽

Sw Spain ◽

Mineral Associations ◽

Hydrodynamic Processes ◽

Bay Of Cadiz ◽

Recent Sediments ◽

Muddy Sediments ◽

Bay Of Cádiz

AbstractThe distribution of clay minerals in recent sediments on the continental shelf and in the Bay of Cádiz has been analysed as part of a wider study of sedimentary exchange between the continent and the continental margin. The clay minerals included in the muddy sediments consist mainly of illite, kaolinite, smectite, randomly mixed-layered illite-smectite, chlorite, vermiculite and randomly mixed-layered illite-chlorite. Distribution of the minerals indicates that inheritance from the adjacent continental areas is the most important process involved.The relations between the clay minerals were established by Q-mode and R-mode factor analysis. The main clay mineral associations are: (1) illite-kaolinite, (2) smectite-random mixed-layered illitesmectite, and (3) kaolinite-random mixed-layered illite-smectite-vermiculite. The main sources of sediment supply to the continental shelf are the Guadalquivir and Guadiana rivers. Sediment from these rivers and from the rivers flowing into the Bay of Cádiz (mainly the Guadalete) is transported to the part of the shelf outside the bay by ebb-tide currents. The path of this outflow to the continental shelf, where the sediment is partially deposited, is influenced by the morphology of the coast and by hydrodynamic processes.

Download Full-text