scholarly journals Spatial distribution of autotrophic picoplankton in relation to physical forcings: the Gulf of Cadiz, Strait of Gibraltar and Alboran Sea case study

2009 ◽  
Vol 31 (11) ◽  
pp. 1339-1351 ◽  
Author(s):  
F. Echevarria ◽  
L. Zabala ◽  
A. Corzo ◽  
G. Navarro ◽  
L. Prieto ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Alboran Sea ◽  
Gulf Of Cadiz ◽  
Strait Of Gibraltar ◽  
Autotrophic Picoplankton ◽  
Gulf Of Cádiz ◽  
Alborán Sea

scholarly journals A tribute to Marie Tharp: Mapping the seafloor of back-arc basins, mid-ocean ridges, continental margins and plate boundaries

2020 ◽  
Author(s):  
Eulàlia Gràcia ◽  
Sara Martínez Loriente ◽  
Susana Diez ◽  
Laura Gómez de la Peña ◽  
Cristina S. Serra ◽  
...  
Keyword(s):  
Strike Slip ◽  
Plate Boundaries ◽  
Alboran Sea ◽  
Gulf Of Cadiz ◽  
Fault Systems ◽  
Ocean Ridges ◽  
Moderate Seismicity ◽  
Gulf Of Cádiz ◽  
Back Arc ◽  
Alborán Sea

<p>Marie Tharp (1920-2006) was a pioneer of modern oceanography. She was an American geologist and oceanographic cartographer who, together with his husband Bruce Heezen, generated the first bathymetric map of the Atlantic Ocean floor. Tharp's work revealed the detailed topography and geological landscape of the seafloor. Her work revealed the presence of a continuous rift valley along the Mid-Atlantic Ridge axis, causing a paradigm in earth sciences that led to the acceptance of plate tectonics and continental drift theories. Piecing maps together in the late 1940s and early 1950s, Marie and his partner Bruce Heezen discovered the 75.000 km underwater ridge bounding around the globe. By this finding, they laid the conclusion from geophysical data that the seafloor spreads from mid-ocean ridges and that continents are in motion with respect to one another—a revolutionary geological theory at that time. Many years later, satellite images demonstrate that Tharp’s maps were accurate. In this contribution, we focus on detailed bathymetric maps collected from year 1992 to today, which include bathymetric maps from diverse parts of the world. For instance, we will show a) Back-arc basins (i.e. the Bransfield Basin, Antarctica; and the North Fiji Basin, SW Pacific); b) Mid-ocean ridges and fracture zones (i.e. the MAR at the South of Azores, the MAR at the Oceanographer-Hayes, and the St. Paul Fracture Zone at the Equator), and c) Active tectonic structures from the Gulf of Cadiz and Alboran Sea, located at the Africa-Eurasia plate boundary (Gibraltar Arc). Regarding this last area, we will characterize the seafloor expression of the fault systems, as well as the subsurface structure of the faults in the Gulf of Cadiz and Alboran Sea. This zone is characterized by a moderate seismicity, mainly reverse and strike-slip focal mechanisms; although large historical (AD1755, AD1829) and instrumental earthquakes or large/great magnitude also occurred, such as the earthquakes of 1969, 1994, 2004 and 2016. In addition, the Gulf of Cadiz-Alboran Sea area is compartmentalized in different crustal domains, bounded by active strike-slip fault systems. We adopted a multi-scale approach, including morphological analysis of shipboard multibeam bathymetry, near-bottom bathymetry obtained with Autonomous Underwater Vehicles (AUVs) at a resolution of 1-2 m, and medium to deep penetration multi-channel seismic (MCS) data. Finally, we will also show a couple of videos from recent marine cruises in the Gibraltar Arc (SHAKE-2015 and INSIGHT-2018), both using state-of-the-art high-resolution marine technologies.</p>

Ocean surface water response to short-term climate changes revealed by coccolithophores from the Gulf of Cadiz (NE Atlantic) and Alboran Sea (W Mediterranean)

2004 ◽  
Vol 205 (3-4) ◽  
pp. 317-336 ◽  
Author(s):  
Elena Colmenero-Hidalgo ◽  
José-Abel Flores ◽  
Francisco J Sierro ◽  
M.Ángeles Bárcena ◽  
Ludvig Löwemark ◽  
...  
Keyword(s):  
Surface Water ◽  
Climate Changes ◽  
Ocean Surface ◽  
Alboran Sea ◽  
Gulf Of Cadiz ◽  
Ne Atlantic ◽  
Short Term ◽  
Gulf Of Cádiz ◽  
Water Response ◽  
Alborán Sea

scholarly journals SCHACKOINELLA SPINA, A NEW BENTHIC FORAMINIFERAL SPECIES FROM COLD-WATER CORAL ECOSYSTEMS OF THE ALBORAN SEA AND THE GULF OF CÁDIZ

2015 ◽  
Vol 45 (4) ◽  
pp. 344-353
Author(s):  
Claudio Stalder ◽  
Flavius Székely-Szabolcs ◽  
Akram El Kateb ◽  
David Van Rooij ◽  
Silvia Spezzaferri
Keyword(s):  
Cold Water ◽  
Alboran Sea ◽  
Gulf Of Cadiz ◽  
Foraminiferal Species ◽  
Gulf Of Cádiz ◽  
Alborán Sea ◽  
Water Coral

scholarly journals Neotectonics of the SW Iberia margin, Gulf of Cadiz and Alboran Sea: a reassessment including recent structural, seismic and geodetic data

2012 ◽  
Vol 188 (3) ◽  
pp. 850-872 ◽  
Author(s):  
T. A. Cunha ◽  
L. M. Matias ◽  
P. Terrinha ◽  
A. M. Negredo ◽  
F. Rosas ◽  
...  
Keyword(s):  
Geodetic Data ◽  
Alboran Sea ◽  
Gulf Of Cadiz ◽  
Gulf Of Cádiz ◽  
Alborán Sea

scholarly journals A high-resolution hydrodynamic-biogeochemical coupled model of the Gulf of Cadiz – Alboran Sea region.

2014 ◽  
Vol 15 (4) ◽  
pp. 739 ◽  
Author(s):  
D. M. MACIAS ◽  
C. T. GUERREIRO ◽  
L. PRIETO ◽  
A. PELIZ ◽  
J. RUIZ
Keyword(s):  
Model Development ◽  
Model Performance ◽  
Coupled Model ◽  
Biogeochemical Model ◽  
Alboran Sea ◽  
Gulf Of Cadiz ◽  
Large Area ◽  
Biological Variables ◽  
Gulf Of Cádiz ◽  
Alborán Sea

The southern Iberia regional seas comprise the Gulf of Cadiz and the Alboran Sea sub-basins connected by the narrow Strait of Gibraltar. Both basins are very different in their hydrological and biological characteristics but are, also, tightly connected to each other. Integrative studies of the whole regional oceanic system are scarce and difficult to perform due to the relative large area to cover and the different relevant time-scales of the main forcings in each sub-basin. Here we propose, for the first time, a fully coupled, 3D, hydrodynamic-biogeochemical model that covers, in a single domain (~2km resolution) both marine basins for a 20 years simulation (1989-2008). Model performance is assessed against available data in terms of spatial and temporal distributions of biological variables. In general, the proposed model is able to represent the climatological distributions of primary and secondary producers and also the main seasonality of primary production in the different sub-regions of the analyzed basins. Potential causes of the observed mismatches between model and data are identified and some solutions are proposed for future model development. We conclude that most of these mismatches could be attributed to the missing tidal forcing in the actual model configuration. This model is a first step to obtain a meaningful tool to study past and future oceanographic conditions in this important marine region constituting the unique connection of the Mediterranean Sea with the open world’s ocean.

scholarly journals Multi-decadal climate variability in southern Iberia during the mid- to late-Holocene

2018 ◽  
Author(s):  
Julien Schirrmacher ◽  
Mara Weinelt ◽  
Thomas Blanz ◽  
Nils Andersen ◽  
Emilia Salgueiro ◽  
...  
Keyword(s):  
Climate Variability ◽  
North Atlantic ◽  
Late Holocene ◽  
Sea Surface ◽  
Driving Mechanism ◽  
Alboran Sea ◽  
Gulf Of Cadiz ◽  
Gulf Of Cádiz ◽  
Southern Iberia ◽  
Alborán Sea

Abstract. To assess the regional multi-decadal to multi-centennial climate variability at the southern Iberian Peninsula during the mid- to late- Holocene transition multi-proxy records of two marine sediment cores were established for two sites in the Alboran Sea (ODP-161-976A) and the Gulf of Cadiz (GeoB5901-2). High-resolution records of organic geochemical proxies and planktic foraminiferal assemblages are used to decipher precipitation and vegetation changes as well as the sea surface conditions with respect to Sea Surface Temperature (SST) and marine primary productivity (MPP). n-Alkane records as a proxy for precipitation changes suggest a series of six distinct drought events at 5.4 ka BP, from ca. 5.1 ka BP to 4.9 ka BP, from 4.8 to 4.7 ka BP, at 4.6  ka BP, from 4.4 to 4.3 ka BP and, from 3.8 to 3.7 ka BP. Each drought event is associated with a major vegetation change towards higher proportions of C4 vegetation. The drought events are further accompanied by annual and spring/ winter SST warming as well as decreasing MPP in the Alboran Sea. Altogether, the close correlation of the observed droughts with North Atlantic Oscillation (NAO)-like variability suggests changes in the atmospheric circulation as important driving mechanism of terrestrial and oceanic variability at southern Iberia and the Alboran Sea, respectively. Sea surface variability in the Gulf of Cadiz, instead, is intimately linked to the North Atlantic Bond Events. In particular, during Bond Events 3 and 4 a pronounced increase in seasonality is found.

scholarly journals Multi-decadal atmospheric and marine climate variability in southern Iberia during the mid- to late-Holocene

2019 ◽  
Vol 15 (2) ◽  
pp. 617-634 ◽  
Author(s):  
Julien Schirrmacher ◽  
Mara Weinelt ◽  
Thomas Blanz ◽  
Nils Andersen ◽  
Emília Salgueiro ◽  
...  
Keyword(s):  
Climate Variability ◽  
North Atlantic ◽  
Late Holocene ◽  
Environmental Indicators ◽  
Alboran Sea ◽  
Gulf Of Cadiz ◽  
Geochemical Properties ◽  
Gulf Of Cádiz ◽  
Southern Iberia ◽  
Alborán Sea

Abstract. To assess the regional multi-decadal to multi-centennial climate variability along the southern Iberian Peninsula during the mid- to late-Holocene record of paleo-environmental indicators from marine sediments were established for two sites in the Alboran Sea (ODP-161-976A) and the Gulf of Cádiz (GeoB5901-2). High-resolution records of organic geochemical properties and planktic foraminiferal assemblages are used to decipher precipitation and vegetation changes as well as hydrological conditions with respect to sea surface temperature (SST) and marine primary productivity (MPP). As a proxy for precipitation change, records of plant-derived n-alkane composition suggest a series of five distinct dry episodes in southern Iberia at 5.4±0.3 ka cal BP, from 5.1 to 4.9±0.1 ka cal BP, from 4.8 to 4.7±0.1 ka cal BP, from 4.4 to 4.3±0.1 ka cal BP, and at 3.7±0.1 ka cal BP. During each dry episode the vegetation suffered from reduced water availability. Interestingly, the dry phase from 4.4 to 4.3±0.1 ka cal BP is followed by a rapid shift towards wetter conditions revealing a more complex pattern in terms of its timing and duration than was described for the 4.2 ka event in other regions. The series of dry episodes as well as closely connected hydrological variability in the Alboran Sea were probably driven by NAO-like (North Atlantic Oscillation) variability. In contrast, surface waters in the Gulf of Cádiz appear to have responded more directly to North Atlantic cooling associated with Bond events. In particular, during Bond events 3 and 4, a pronounced increase in seasonality with summer warming and winter cooling is found.

Sign in / Sign up

Export Citation Format

Share Document