Environmental Forcing of Red Tides in the Southern Benguela

Abstract

The Southern Benguela cape upwelling plumes have inshore wind shadows prone to red tides in late summer. Their intensity and coverage are estimated by satellite fluorescence measurements in the period 1997-2012 and qualified by in situ reports. High satellite fluorescence cases are identified at daily to seasonal time scales, and characteristics of the upper ocean and lower atmosphere are studied using third generation reanalyses. A dominant feature is easterly winds over the Cape Peninsula (34 ∘ S, 18 ∘ E) induced by a ridging anticyclone-coastal low weather pattern. Over Cape Columbine (33 ∘ S), there is a wind shadow with cyclonic wind and current shear. Composite atmospheric profiles reveal a 4 ∘ C temperature inversion near 500 m that traps a coastal wind jet >6 m/s below 200 m. The composite shelf oceanography shows a relic upwelling plume below 10 m overtopped by warmer water near the coast, providing the thermal stratification needed for biotic aggregation. Data from the IPSL5 coupled climate model over the period 1980-2080 indicates that environmental conditions favoring red tides may become more frequent.

The Influence of the Lower Stratosphere on Ridging Atlantic Ocean Anticyclones over South Africa

“…COLs associated with the ridging anticyclone contribute an additional 16% of the rainfall in the Eastern Cape (Engelbrecht et al 2015). Ridging anticyclones can also affect transport (e.g., Tyson et al 1996), bring about conditions for transporting aerosols, for example (Tlhalerwa et al 2005), and ocean dynamical processes (e.g., Rouault et al 2000;Jury 2014) like upwelling, and possibly fog in Cape Town region (van Schalkwyk and Dyson 2013). Ridging anticyclones are clearly very important to the synoptic climatology of South Africa.…”