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Tuesday, November 17, 2020 | History

2 edition of Sediments in surface waters of the eastern Gulf of Guinea found in the catalog.

Sediments in surface waters of the eastern Gulf of Guinea

Brian D. Bornhold

Sediments in surface waters of the eastern Gulf of Guinea

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  • 33 Currently reading

Published .
Written in English


Edition Notes

Statementby Brian D. Bornhold, Jean R. Mascle and Kenichi Harada.
SeriesReference -- no.72-76., Reference (Woods Hole Oceanographic Institution) -- no. 72-76.
ContributionsMascle, Jean., Harada, Kenichi.
ID Numbers
Open LibraryOL15183732M

Despite various water protection measures, good water quality and reduction of nutrient loads seem very distant goals, largely due to limited knowledge of processes occurring in river valleys. Our study aimed at establishing the role of small floodplain reservoirs in the eutrophication processes, in the face of recent climate changes. The content of phosphorus and nitrogen compounds was. Abstract Three sediment cores (MV, MV, and MD) from the Gulf of Papua (GoP), Papua New Guinea, were analyzed to assess changes in climatic, oceanographic, and sedimentological conditions over the last kyr. Palynomorphs, which were isolated from sediment core samples, were collected at approximately m intervals using a strong acid and oxidant (MD)/non-oxidant (MV, MV An extensive suite of physical oceanographic, remotely sensed, and water quality measurements, collected from through in two ice-marginal lakes at Bering Glacier, Alaska—Berg Lake and Vitus Lake—show that each has a unique circulation controlled by their specific physical forcing within the glacial system. Conductivity profiles from Berg Lake, perched m a.s.l., show no salt.


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Sediments in surface waters of the eastern Gulf of Guinea by Brian D. Bornhold Download PDF EPUB FB2

This river and its tributaries forms the major sediment Sediments in surface waters of the eastern Gulf of Guinea book conduit to the offshore area in the south-eastern Niger Delta and to the Gulf of Guinea. Site for more sediment accumulation within the meandering system is the point bar characterized by poorly sorted, coarse to very coarse-grained sands with gravels deposited in the deeper parts of the meander belt by a slow-moving water along the curve Author: Prince Suka Momta.

sediments are moved oceanward into the Gulf of Guinea through canyon. Some are distrib- uted within the shores by waves, longshore currents and other marine energy fluxes to form. Suspended matter in the surface waters of the eastern Gulf of Guinea was studied in relation to the prevailing oceanic currents and the sediment compo Cited by: 6.

The surface waters of the Gulf of guinea are basically warm (temperatures above 24°C) and of low salinity (below 35°00), the result of heavy rainfall and high river discharge during the wet season.

These surface waters circulate in an easterly direction along the West African coasts from Senegal to Nigeria. Dissolved silica in surface waters of the southwest At-lantic Ocean are around µM (World Ocean Atlas, ) and, thus, bring very little Sediments in surface waters of the eastern Gulf of Guinea book to the eastern Gulf of Guinea.

Dissolved silica concentrations in surface waters of the eastern Gulf of Guinea are slightly higher than in the open ocean with values of ∼6–8µM during the boreal. SEA SURFACE TEMPERATURE PATTERNS IN THE GULF OF GUINEA ; Iloeje, ). The mT air mass originates from the southern high-pressure belt located off the coast of Namibia, and in its trajectory, picks up moisture from over the South Atlantic Ocean, crosses the Equator, and enters GOG and West Africa.

The cT air mass originates. Conference Introduction: Modern and Cenozoic Slope and Deep-Water Sediments of the Gulf of Mexico. Author(s) James M. Coleman; James M. Coleman Coastal Studies Institute Louisiana State University Baton Rouge, Louisiana Search for other works by.

reduced surface salinity as far as in the eastern Gulf of Guinea (Kolesnikov ). studied dinoflagellate cysts from the surface sediments of the Congo deep-sea fan and its surroundings. They concluded that opportunistic explained along these lines and would indicate a decrease in salinity of the surface waters of the eastern Gulf of.

The light hydrocarbon gases are not very soluble in water, so they can be extracted from a sediment by a gas/water partitioning procedure (19). Geographic Distribution The Gulf of Mexico has been the most geographically prolific area for collection of gas hydrates in near surface sediments.

Gas. Most essential is that the location where a pollen grain enters the water column is close to the location on the ocean floor where the same pollen grain is incorporated in the surface sediments.

In other words, the distribution pattern of pollen grains in the air above the sea surface is reflected in the sediments on the ocean floor to a high.

Suspended matter in offshore surface waters has been studied recently in several areas such as off the eastern United States (Manheim et al., ), in the East China and Yellow seas (Wageman, et al., ), in the Gulf of Guinea (Bornhold et al., ) as well as in the south-eastern Atlantic (Emery et al., ) and in several.

millennial scale from marine sediment core MD (02°'N, 09°'E, m water depth), which was recovered from the eastern part of the Gulf of Guinea in the EEA (Fig. Oceanographic setting and proxy records. The Gulf of Guinea is located in the eastern extension of the equatorial Atlantic warm tongue (8).

in the eastern Atlantic, which suggests a brief, northward drift of the ITCZ at this time and the disappearance of the Guinea Current. The Guinea Current returned to the Gulf after Ma. The highest sea-surface temperature (SST) occurred between ~ and Ma in the Gulf of Guinea.

Warm surface waters. The distal lobe of the CongoCanyon (Gulf of Guinea, South AtlanticOcean) is fuelled by organic matter delivered by one of the world’s largest rivers, the Congo River (Khripounoff et al., ).

The last sampling location is shallower and situated off the Nile Deep Sea Fan adjacent to the Amon Mud volcano in the Eastern Mediter-ranean Sea. Freshwater input from the Sanaga and Niger rivers is the main factor determining modern sea surface salinity (SSS) variability in the eastern Gulf of Guinea (Fig.

The large volume of riverine. Spatiotemporal variations of the partial pressure of CO2 (pCO2) were studied during 8 oceanographic cruises conducted between March and February in surface waters of the eastern shelf of.

marine sediment core collected in the Gulf of Guinea. We measured hydrogen isotopes in C alkenones (dD a) to estimate changes in seawater dD.

We find a smooth, long-term increase of 10% in dD a between 10 and 3 kyr BP, followed by a rapid decrease of 10% in dD a between 3 kyr BP and core top to values slightly lighter than during the early Holocene.

Syee Weldeab, Ralph R. Schneider, Peter Müller, Comparison of Mg/Ca‐ and alkenone‐based sea surface temperature estimates in the fresh water–influenced Gulf of Guinea, eastern equatorial Atlantic, Geochemistry, Geophysics, Geosystems, /GC, 8, 5, (). Ocean Drilling Program (ODP) site (1° 23′S, 11° 44′W, 3, m water depth) is in the eastern Atlantic Ocean in the Gulf of Guinea.

ODP site (16° 37′N, 59° 48′E, 2, m water depth) is in the northwestern Indian Ocean. The Beibu Gulf is a semi-enclosed gulf in the northwest of the South China Sea. We palynologically analyzed surface sediment samples from the eastern Beibu Gulf to improve bioclimatic interpretation of fossil pollen records there.

Surface pollen assemblages could be classified into five pollen regions based on the distributions of total, arboreal, herbaceous and fern pollen. Indicators of climate and sediment-source variations at Site implications for the reconstruction of paleoenvironments in the Gulf of Guinea through Pleistocene times, pp.

Giresse, F. Gadel, L. Serve, J.P. Barusseau ( MB). Gulf of Guinea (Figure 1). Twenty-five grams of each dried sediment sample was weighed. Following methodology employed by Clark et al. () and Dublin-Green (,), samples were processed for foraminifera. The sample residues were spread over a standard picking tray and were scanned under reflected light, binocular microscope.

and trace element composition of surface waters as well as the terrigenous sediment in the Gulf of Guinea are strongly influenced by runofffrom large river systems draining the West African monsoon area (Zabel et al., ; Weldeab et al., a,b). The most important river systems in this re-gion are the Niger, Sanaga, Nyong and Ntem rivers.

The. General characteristics of ballast tank sediment. As shown in Table 1, the pH of ballast tank sediments was in the range of ~ with the mean ofindicating that these sediments belonged to alkaline might be associated with the characteristics of ocean water, which usually present alkaline (Taneez et al.

).Moreover, the TOC ranged from to %, with an. eastern Gulf of Guinea. Of the two, the large Penaeus duorarum occurs mainly offshore in fathoms; the smaller Parapenaeopsis atlantica occurs in larger numbers closer to the coast in fathoms.

Neither species penetrate into the cold water below the thermocline, at which depths other but less important species occur. Distribution and enrichment of trace metals in marine sediments from the Eastern Equatorial Atlantic, off the Coast of Ghana in the Gulf of Guinea. Marine Pollution Bulletin Gehringer, D., M.

Finkelstein, K. Coale, M. Stephenson and J. Geller. 46 surface sediment samples from the Gulf of Guinea were analysed for their dinoflagellate cyst content (Marret, a, b).

Amongst the 34 taxa identified, the morphotype first identified as Operculodinium sp. II occurred in rela tively high frequencies (up to %) off the Niger River mouth and in Biafra Bay, where salinity seasonally varies.

Methods Sampling Shoreline sediments were collected from 61 sites (table 1 and fig. 1) that had been identified as locations with a high probability of being impacted by oil released from the Deepwater Horizon oil spill in the Gulf of Mexico. For drilling muds and cuttings, CORMIX supports modeling of up to 10 custom particle size classes, including particle fall velocities.

Data for the case study were obtained from a field study conducted in the Gulf of Guinea. Drilling muds and cuttings were discharged on the surface from an offshore platform in about 46 m of water. The isotopic composition of surface seawater is widely used to infer past changes in sea surface salinity using paired foraminiferal Mg/Ca and δ 18 O from marine sediments.

At low latitudes, paleosalinity reconstructions using this method have largely been used to document changes in the hydrological cycle. This method usually assumes that the modern seawater δ18O (δ [1] A sediment budget between the Congo River drainage basin and the western African margin in the Gulf of Guinea is proposed on the basis of published and unpublished offshore Tertiary isopach maps, and onshore digital elevation analysis.

The overall denudation of that area may be as high as × 10 6 km 3 with a maximum of 10% coming from Mesozoic and Cenozoic covers. Planktonic foraminifera in Gulf of Guinea sediments INTRODUCTION During andthe Institute of Marine Sciences of the University of Miami, Florida, conducted two deep-sea biological expeditions to the Gulf of Guinea aboard the Research Vessel John Elliot Pillsbury.

During these cruises, which formed part of the International Equalant. Gulf of Guinea has its greatest eastward advection, bringing cold and salty surface water into the Gulf of Guinea [Richardson and Walsh, ] (Figure 2). In boreal winter, the GC is weak and surface water in the Gulf of Guinea is relatively warm (Figure 2).

Throughout the year, the wind field over the Gulf of Guinea is dominated by a. Gaëlle Herbert, Bernard Bourlès, Impact of intraseasonal wind bursts on sea surface temperature variability in the far eastern tropical Atlantic Ocean during boreal spring and focus on the mid-May event, Ocean Science, /os, 14, 4, (), ().

marine sediment core collected in the Gulf of Guinea. We measured hydrogen isotopes in C alkenones (dDa) to estimate changes in seawaterdD. We nd a smooth, long-term increase of 10% in dDa between 10 and 3 kyr BP, followed by a rapid decrease of 10% in dDa between 3 kyr BP and core top to values slightly lighter than during the early Holocene.

This study presents a comparison of sea surface temperature (SST) estimates based on Mg/Ca ratios of Globigerinoides ruber and alkenone unsaturation index (U 37 K') in core sediment recovered from the Gulf of Guinea, eastern equatorial Atlantic.

Mg/Ca- and U 37 K' -based SST estimates yield fairly comparable results for the time inter, years and for the late Holocene. The green-turquoise water over the banks is less than 9 m (30 ft) deep but the deep blue of the Tongue is 1, to 1, m (4, to 6, ft) deep.

All the sediment on the banks, including the material that forms the islands, is calcium carbonate (lime) precipitated from sea water by animals and plants. Image courtesy of NASA. Abstract: Background and Objective: The dominant factors influencing abundance and distribution patterns of foraminifera in shallow water coastal environments of southwest Nigeria sector of the Gulf of Guinea was undertaken.

The objectives were to characterize benthic foraminiferal population in sediments and establish relationships of the. The Gulf of Thailand, also known as the Gulf of Siam, is a shallow northwesternly inlet in southwestern South China Sea, bounded between the southwestern shores of the Indochinese Peninsula and the northern half of the Malay is around km ( mi) in length and up to km ( mi) in width, and has a surface area ofkm 2 (, sq mi).

Provenance of lithogenic surface sediments and pathways of riverine suspended matter in the Eastern Mediterranean Sea: evidence from Nd/Nd and 87Sr/86Sr ratios. Comparison of Mg/Ca‐and alkenone‐based sea surface temperature estimates in the fresh water–influenced Gulf of Guinea, eastern equatorial Atlantic.

tory of the WAM, using a marine sediment core MD (02 N, 09 E, water depth m) recovered from the eastern part of the Gulf of Guinea, EEA (Figure 1). The core material covers the lastyears of West African climate history [Weldeab .The Gulf of Mexico (Spanish: Golfo de México) is an ocean basin and a marginal sea of the Atlantic Ocean, largely surrounded by the North American continent.

It is bounded on the northeast, north and northwest by the Gulf Coast of the United States, on the southwest and south by the Mexican states of Tamaulipas, Veracruz, Tabasco, Campeche, Yucatan, and Quintana Roo, and on the southeast by .quantitatively the cycle of solar heights.

Between October and May, Sea surface temperatures range from 27ooC, while during the rainy season of June to October, the range is between 24o and 25oC. (Dublin Green et al, ). The surface water is typically oceanic surface water of the Gulf of Guinea with salinity generally less than %.