Wayne Steven Goschen

Unconsolidated marine sediment habitats spatially make up the majority of global ocean seabed, yet benthic faunal patterns and their abiotic drivers remain poorly understood. Benthic research in Algoa Bay, on the south coast of South Africa, has largely focused on rocky reefs, while the dominant unconsolidated sediment habitats have been poorly stu...

An investigation into the ocean response to a protracted (>48 h) strong south-westerly wind event averaging 9.6 m/s on the eastern Agulhas Bank, South Africa, using in situ instrument data from Algoa Bay and a high resolution (dx ∼1 km) ROMS ocean model, is presented. A coastal trapped wave (CTW) was shown to be associated with the event, the peak...

Within the coastal zone, oceanographic features, such as fronts, can have major effects on the abundance and distribution of larval fish. We investigated the effects of fronts on larval fish assemblages by jointly collecting physical (ADCP and CTD) and biological (larvae) data in the nearshore waters of the south coast of South Africa, on four sepa...

There is a general need for a broader base of information on the finer detail of ocean processes in the Eastern Agulhas Bank region. In this thesis, the Regional Ocean Modelling System (ROMS) was applied to resolve high resolution (~1km) bay and shelf scale ocean processes along the south eastern coastline of South Africa using an offline multi-nes...

Inter-relationships between physical ocean-atmosphere processes over the eastern Agulhas Bank are explored using data assimilation by the Hybrid Coordinate Ocean Model (HYCOM), which provides daily fields and time series off the south coast of South Africa (33.75–34.5S, 24.0–26.5E) in the period 2009–2017. Our objectives are: i) to describe and und...

The El Niño–Southern Oscillation (ENSO) phase state is reported to drive interannual variability in sea temperatures along South Africa’s south coast through its influence on wind-induced upwelling processes. Whether ENSO drives the intensity of localised, abrupt, intermittent upwelling is less well known. To explore this relationship, we used an i...

Vertical migrations of zooplankters have been widely described, but their active movements through shallow, highly dynamic water columns within the inner shelf may be more complex and difficult to characterize. In this study, invertebrate larvae, currents, and hydrographic variables were sampled at different depths during and after the presence of...

Southern Africa occupies a critical position within the southern hemisphere for the study of broadscale global change and the three oceans around South Africa (the Atlantic, Indian and Southern Oceans) play a vital role in determining local and regional climate and weather patterns. Oceans and coasts also provide various resources and services (e.g...

Small pelagic fish play a significant role in regulating the foraging activities and population trends of marine top predators in upwelling ecosystems, yet there is little information on oceanographic drivers of fish assemblages at temporal and spatial scales relevant to their predators. The survival of the Endangered African penguin Spheniscus dem...

Early studies within Algoa Bay, temperate South Africa, have predicted that coastal fish species with pelagic eggs spawn offshore. More recent studies on larval fish assemblages in the nearshore have shown that spawning may take place closer to shore based on the prevalence of preflexion larvae. The aim of the present study was to investigate wheth...

Six large solitary meanders in the Agulhas Current, so-called Natal Pulses, propagated down the eastern coast of South Africa between 2009 and 2011. Their influence on the coastal waters between Port Alfred and Algoa Bay, on the far eastern Agulhas Bank, was measured by thermistor strings moored at 30–80 m bottom depths and two current metres (30 m...

A synopsis of the main results of physical oceanographic research undertaken in and around Algoa Bay up until 2010

Ecological connectivity is critical for population dynamics but in many benthic species it is complicated by a planktonic larval phase, whose dispersal remains poorly understood. Using a plankton pump, we examine the distribution of intertidal mussel larvae along three axes: alongshore, cross-shelf and by depth during a large scale (600 km) cruise...

Cross-shelf distributions of temperature, salinity, water masses, and dissolved oxygen in St Helena Bay revealed substantial vertical and seasonal variations. In the surface layers, near-shore and offshore temperature and salinity patterns differed, with bay-scale variability linked to upwelling dynamics and coastal processes, while the offshore re...

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As the Agulhas Current flows along the south-east coast of South Africa, a number of processes operate that bring cold, deep water up onto the narrow shelf. As a consequence, upwelling along the coastline is enhanced farther southward and downstream. This situation is investigated off Algoa Bay and along the south-east coast to Port Alfred, where m...

Review of physical oceanographic processes of Algoa Bay. Topics covered include weather and wind, the influence of the Agulhas Current, coastal upwelling and the resulting sea temperature, salinity and nutrient structures as well as tides and tidal and inertial currents. The sedimentary structure and waves, sediments and beach processes are also co...

The lognormal forward-Libor and Swap market models were formulated to price caps and swaptions. However, the prices computed by these two models, under equivalent measures, are reported to be unequal. This study investigates this incompatibility by computing the prices of caps and swaptions under both the forward Libor measure and the forward Swap...

Between February 1989 and March 1990 a study was undertaken to investigate sea temperature variability around Cape Recife, Algoa Bay, during and after upwelling events. Data were collected by moored thermistors and during a ship's cruise, and wind measurements were made at Cape Recife and Bird Island. Results confirmed upwelling off the southern sh...

During August 1988, warm water from a plume originating in an Agulhas Current meander, and cold water from an eddy nested in the offshore deflection of the meander, penetrated over the adjacent continental shelf and into Algoa Bay. The intrusion occurred during strong to gale force westerly winds. Results indicate that, while a meander in the Agulh...

Opportunistically collected information on sea temperature and wind was used in a preliminary investigation of physical factors affecting jigged catches of chokka squid Loligo vulgaris reynaudii. Results revealed sea temperature and wind to be correlated with catches during part of the summer upwelling season (October and December) in 1988. Multipl...

Proefskrif (PhD (Oseanografie))--Universiteit van Port-Elizabeth, 1991. Includes bibliographical references (blaaie 284-315)

The most marked yearly variability occurs between May, June and July, and September, October and November. Wind roses confirm these seasonal differences, while considerable spatial variability occurs with position around the bay. A strong diurnal signal due to land and sea breeze generation is evident at all the sites, while a marked seasonal chang...

Satellite imagery over a 3-year period is used to provide statistical data on the position of the Agulhas Current, frontal features, and meanders off the southeast coast of South Africa. Data recorded during a cruise undertaken over the continental shelf off Algoa Bay in May 1987 provided subsurface temperature data of a large frontal feature and i...

Data on ocean temperature, currents, salinity and nutrients were obtained in an area off Algoa Bay on the south-east coast of South Africa during a ship's cruise in early November 1986. Satellite imagery provided information on the position of the Agulhas Current during the cruise period, while wind data were available from weather stations on the...

Verhandeling (MSc (Oceanograpghy))--UPE, 1988. Bibliografie: blaaie 17-27(2de groep)

The intrusion of cold water can have marked effects on the biota, with consequences for top predators such as Cape gannets Sula capensis and jackass penguins Spheniscus demersus. The distribution of their prey can be altered. Observations of foraging patterns during upwelling events tie in closely with the changes in the physical environment. -from...