Changes in abundance of the northern Benguela sardine stock during the decade 1990–2000, with comments on the relative importance of fishing and the environment

Boyer, D. C.; Boyer, Helen; Fossen, Inge; Kreiner, Anja

doi:10.2989/025776101784528854

Cited by 75 publications

(51 citation statements)

References 19 publications

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“…These episodes, referred to as Benguela Niños/Niñas, occur following some, but not all extrema of the equatorial zonal mode (e.g., in year 1984) and have an effect on regional rainfall variability and fish distribution and abundance (Boyer et al 2001). …”

Section: Tropical Atlantic Variabilitymentioning

confidence: 99%

Climate Fluctuations of Tropical Coupled Systems—The Role of Ocean Dynamics

et al. 2006

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The tropical oceans have long been recognized as the most important region for large-scale oceanatmosphere interactions, giving rise to coupled climate variations on several time scales. During the Tropical Ocean Global Atmosphere (TOGA) decade, the focus of much tropical ocean research was on understanding El Niño-related processes and on development of tropical ocean models capable of simulating and predicting El Niño. These studies led to an appreciation of the vital role the ocean plays in providing the memory for predicting El Niño and thus making seasonal climate prediction feasible. With the end of TOGA and the beginning of Climate Variability and Prediction (CLIVAR), the scope of climate variability and predictability studies has expanded from the tropical Pacific and ENSO-centric basis to the global domain. In this paper the progress that has been made in tropical ocean climate studies during the early years of CLIVAR is discussed. The discussion is divided geographically into three tropical ocean basins with an emphasis on the dynamical processes that are most relevant to the coupling between the atmosphere and oceans. For the tropical Pacific, the continuing effort to improve understanding of large-and small-scale dynamics for the purpose of extending the skill of ENSO prediction is assessed. This paper then goes beyond the time and space scales of El Niño and discusses recent research activities on the fundamental issue of the processes maintaining the tropical thermocline. This includes the study of subtropical cells (STCs) and ventilated thermocline processes, which are potentially important to the understanding of the low-frequency modulation of El Niño. For the tropical Atlantic, the dominant oceanic processes that interact with regional atmospheric feedbacks are examined as well as the remote influence from both the Pacific El Niño and extratropical climate fluctuations giving rise to multiple patterns of variability distinguished by season and location. The potential impact of Atlantic thermohaline circulation on tropical Atlantic variability (TAV) is also discussed. For the tropical Indian Ocean, local and remote mechanisms governing low-frequency sea surface temperature variations are examined. After reviewing the recent rapid progress in the understanding of coupled dynamics in the region, this study focuses on the active role of ocean dynamics in a seasonally locked east-west internal mode of variability, known as the Indian Ocean dipole (IOD). Influences of the IOD on climatic conditions in Asia, Australia, East Africa, and Europe are discussed. While the attempt throughout is to give a comprehensive overview of what is known about the role of the tropical oceans in climate, the fact of the matter is that much remains to be understood and explained. The complex nature of the tropical coupled phenomena and the interaction among them argue strongly for coordinated and sustained observations, as well as additional careful modeling investigations in order to further advance the current...

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Section: Tropical Atlantic Variabilitymentioning

confidence: 99%

Climate Fluctuations of Tropical Coupled Systems—The Role of Ocean Dynamics

et al. 2006

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“…These anomalously warm events often induce significant rainfall anomalies, particularly over Angola and Namibia (Hirst and Hastenrath 1983;Rouault et al 2003a) and can drastically modify fish distributions (Boyer et al 2001). Benguela Ninos occurred in 1934, 1949, 1963, 1984(Shannon etal.…”

Section: Benguela Warm and Cool Eventsmentioning

confidence: 99%

Seasonal to Decadal Prediction of Southern African Climate and Its Links with Variability of the Atlantic Ocean

Reason¹,

Landman²,

Tennant³

2006

Bull. Amer. Meteor. Soc.

183

172

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“…Sardine fisheries in southern African are managed mainly on the basis of acoustic surveys (Hampton 1992, Barange et al 1999, Boyer et al 2001. Abundance estimates from these surveys are highly sensitive to biases caused by fish behaviour, which may influence the acoustic detection of the fish Simmonds 1992, Fréon andMisund 1999).…”

mentioning

confidence: 99%