Articles by Author: F A Shillington

Search results for F A Shillington

We found 8 results for you
  1. Identification and classification of vertical chlorophyll patterns in the Benguela upwelling system and Angola-Benguela front using an artificial neural network

    Identification and classification of vertical chlorophyll patterns in the Benguela upwelling system and Angola-Benguela front using an artificial neural network

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Information on the vertical chlorophyll structure in the ocean is important for estimating integrated chlorophyll a and primary production from satellite. For this study, vertical chlorophyll profiles from the Benguela upwelling system and the Angola-Benguela front were collected in winter...
  2. Filaments and the Benguela frontal zone: offshore advection or recirculating loops?

    Filaments and the Benguela frontal zone: offshore advection or recirculating loops?

    Item type: Journal Article • Journal: South African Journal of Marine Science
    With the advent of remote sensing, it has become clear that the frontal region of eastern boundary current upwelling systems is not smooth and unvarying, but rather has a convoluted, ragged edge consisting of mesoscale plumes, jets and filaments. Such...
  3. Carbon export associated with the Benguela upwelling system

    Carbon export associated with the Benguela upwelling system

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Thermal infra-red satellite imagery and ship-borne studies of 15N stable isotopes are used to provide a first estimate of the quantity of carbon exported from the Benguela upwelling system during summer 1983/84. From satellite imagery, a region where cold water...
  4. Satellite comparison of the seasonal circulation in the Benguela and California current systems

    Satellite comparison of the seasonal circulation in the Benguela and California current systems

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Satellite surface height and surface temperature fields are used to examine the seasonal surface circulation in the Benguela and California Current systems. In the California Current system, an equatorward jet develops in spring and summer near to the coast, with...
  5. Towards the validation of SeaWiFS in southern African waters: the effects of gelbstoff

    Towards the validation of SeaWiFS in southern African waters: the effects of gelbstoff

    Item type: Journal Article • Journal: South African Journal of Marine Science
    The effective application of future ocean colour data for southern African waters requires an in-depth assessment of bio-optical algorithm performance, given the productive and highly variable nature of the oceanographic region. Phytoplankton degradation products, commonly known as gelbstoff, represent a...
  6. Climatology and Variability of Sea Surface Temperature and Surface Chlorophyll in the Benguela and Agulhas Ecosystems As Observed by Satellite Imagery

    Climatology and Variability of Sea Surface Temperature and Surface Chlorophyll in the Benguela and Agulhas Ecosystems As Observed by Satellite Imagery

    Item type: Journal Article • Journal: African Journal of Marine Science
    A climatology of satellite-derived sea surface semperature (SST) and surface chlorophyll a concentration (Chl), and their associated variability at time-scales from weeks to years, was constructed for the Benguela and Agulhas ecosystems. Global area coverage data at 4.5 km spatial...
  7. Remotely sensed variability of temperature and chlorophyll in the southern Benguela: upwelling frequency and phytoplankton response

    Remotely sensed variability of temperature and chlorophyll in the southern Benguela: upwelling frequency and phytoplankton response

    Item type: Journal Article • Journal: African Journal of Marine Science
    High-resolution (1km) satellite data from the NOAA AVHRR (Advanced Very High Resolution Radiometer) and OrbView-2 SeaWiFS (Sea-viewing Wide Field-of-view Sensor) are used to investigate the upper layer dynamics of the southern Benguela ecosystem in more detailed space and time scales...
  8. Reviewing evidence of marine ecosystem change off South Africa

    Reviewing evidence of marine ecosystem change off South Africa

    Item type: Journal Article • Journal: African Journal of Marine Science
    Recent changes have been observed in South African marine ecosystems. The main pressures on these ecosystems are fishing, climate change, pollution, ocean acidification and mining. The best long-term datasets are for trends in fishing pressures but there are many gaps,...