New insights on the upper layer circulation north of the Gulf of Guinea

2016 ◽  
Vol 121 (9) ◽  
pp. 6793-6815 ◽  
Author(s):  
G. Herbert ◽  
B. Bourlès ◽  
P. Penven ◽  
J. Grelet
Keyword(s):  
Gulf Of Guinea ◽  
Upper Layer Circulation

Taxonomic revision of the Jita snakes (Lamprophiidae: Boaedon) from São Tomé and Príncipe (Gulf of Guinea), with the description of a new species

2021 ◽  
pp. 1-31
Author(s):  
Luis MP Ceríaco ◽  
Ana Lisette Arellano ◽  
Robert C Jadin ◽  
Mariana P Marques ◽  
Diogo Parrinha ◽  
...  
Keyword(s):  
New Species ◽  
Taxonomic Revision ◽  
Gulf Of Guinea ◽  
Sao Tome And Principe ◽  
A New Species

scholarly journals Understanding the variability of the rainfall dipole in West Africa using the EC-Earth last millennium simulation

2021 ◽  
Author(s):  
Qiong Zhang ◽  
Ellen Berntell ◽  
Qiang Li ◽  
Fredrik Charpentier Ljungqvist
Keyword(s):  
West Africa ◽  
Model Simulation ◽  
Rainfall Variability ◽  
Low Pressure ◽  
Last Millennium ◽  
Tropical Atlantic ◽  
Gulf Of Guinea ◽  
Dipole Pattern ◽  
Sahel Region ◽  
Heat Low

AbstractThere is a well-known mode of rainfall variability associating opposite hydrological conditions over the Sahel region and the Gulf of Guinea, forming a dipole pattern. Previous meteorological observations show that the dipole pattern varies at interannual timescales. Using an EC-Earth climate model simulation for last millennium (850–1850 CE), we investigate the rainfall variability in West Africa over longer timescales. The 1000-year-long simulation data show that this rainfall dipole presents at decadal to multidecadal and centennial variability and long-term trend. Using the singular value decomposition (SVD) analysis, we identified that the rainfall dipole present in the first SVD mode with 60% explained variance and associated with the variabilities in tropical Atlantic sea surface temperature (SST). The second SVD mode shows a monopole rainfall variability pattern centred over the Sahel, associated with the extra-tropical Atlantic SST variability. We conclude that the rainfall dipole-like pattern is a natural variability mode originated from the local ocean–atmosphere-land coupling in the tropical Atlantic basin. The warm SST anomalies in the equatorial Atlantic Ocean favour an anomalous low pressure at the tropics. This low pressure weakens the meridional pressure gradient between the Saharan Heat Low and the tropical Atlantic. It leads to anomalous northeasterly, reduces the southwesterly moisture flux into the Sahel and confines the Gulf of Guinea's moisture convergence. The influence from extra-tropical climate variability, such as Atlantic multidecadal oscillation, tends to modify the rainfall dipole pattern to a monopole pattern from the Gulf of Guinea to Sahara through influencing the Sahara heat low. External forcing—such as orbital forcing, solar radiation, volcanic and land-use—can amplify/dampen the dipole mode through thermal forcing and atmosphere dynamical feedback.

Petrology of the volcanic island of Annobon, Gulf of Guinea

1980 ◽  
Vol 36 (3-4) ◽  
pp. 253-267 ◽  
Author(s):  
G Cornen ◽  
R.C Maury
Keyword(s):  
Gulf Of Guinea ◽  
Volcanic Island

Rapid fish stock depletion in previously unexploited seamounts: the case ofBeryx splendensfrom the Sierra Leone Rise (Gulf of Guinea)

2015 ◽  
Vol 37 (3) ◽  
pp. 405-409 ◽  
Author(s):  
F Salmerón ◽  
JC Báez ◽  
D Macías ◽  
L Fernandez-Peralta ◽  
A Ramos
Keyword(s):  
Sierra Leone ◽  
Fish Stock ◽  
Gulf Of Guinea ◽  
Stock Depletion

scholarly journals Twin enigmatic microseismic sources in the Gulf of Guinea observed on intercontinental seismic stations

2013 ◽  
Vol 194 (1) ◽  
pp. 362-366 ◽  
Author(s):  
Yingjie Xia ◽  
Sidao Ni ◽  
Xiangfang Zeng
Keyword(s):  
North America ◽  
Temporal Variation ◽  
Crustal Structure ◽  
Source Region ◽  
Broad Band ◽  
Active Volcano ◽  
Gulf Of Guinea ◽  
Waveform Data ◽  
Seismic Stations ◽  
The Earth

Abstract Based on studies of continuous waveform data recorded on broad-band seismograph stations in Africa, Europe and North America, we report evidences for two temporally persistent and spatially localized monochromatic vibrating sources (around 0.036 and 0.038 Hz, respectively) in the Gulf of Guinea, instead of just one source (0.038 Hz or 26 s) found 50 yr ago. The location of the 0.036 Hz source is close to the Sao Tome Volcano, therefore it may be related to volcano processes. However, the 0.038 Hz source cannot be explained with known mechanisms, such as tectonic or oceanic processes. The most likely mechanism is volcano processes, but there is no reported active volcano in source region. Such repetitive vibration sources may provide valuable tools for detecting temporal variation of crustal structure of the Earth.

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