منابع مشابه
Contrasting wind patterns and toxigenic phytoplankton in the southern Benguela upwelling system
The southern Namaqua shelf of the Benguela upwelling system, downstream of the Cape Columbine upwelling cell, is frequently subjected to a variety of harmful algal bloom (HAB) phenomena. Here, winds dictate most physical processes that are important to the development of HABs. Toxic algal cell concentrations and distributions, in relation to their respective toxin content, are compared over 2 a...
متن کاملCarbon isotope records reveal precise timing of enhanced Southern Ocean upwelling during the last deglaciation.
The Southern Ocean plays a prominent role in the Earth's climate and carbon cycle. Changes in the Southern Ocean circulation may have regulated the release of CO₂ to the atmosphere from a deep-ocean reservoir during the last deglaciation. However, the path and exact timing of this deglacial CO₂ release are still under debate. Here we present measurements of deglacial surface reservoir ¹⁴C age c...
متن کاملA dual-tracer approach to estimate upwelling velocity in coastal Southern California
a r t i c l e i n f o a b s t r a c t The distribution of the cosmogenic radionuclide 7 Be (t 1/2 = 53d) in the surface ocean has previously been used to estimate upwelling velocity in the open ocean. However, the loss of 7 Be to particle export has limited this approach in high particle density environments like the continental margins. In this study, we combine a mass balance of 7 Be with a 2...
متن کاملAn Ecosystem Framework for Fisheries Management in the Southern Benguela Upwelling System
casted the increasing need for fisheries managers to take species interactions into account. It is now widely recognized that ecosystem effects need to be considered in managing fisheries (Pauly 1998, Beamish and Mahnken 1999, Gislason et al. 2000). Steele (1996) concluded that a “regime shift in fisheries management” is required if one is to manage fisheries successfully in the context of ecos...
متن کاملWind-driven upwelling in the Southern Ocean and the deglacial rise in atmospheric CO2.
Wind-driven upwelling in the ocean around Antarctica helps regulate the exchange of carbon dioxide (CO2) between the deep sea and the atmosphere, as well as the supply of dissolved silicon to the euphotic zone of the Southern Ocean. Diatom productivity south of the Antarctic Polar Front and the subsequent burial of biogenic opal in underlying sediments are limited by this silicon supply. We sho...
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ژورنال
عنوان ژورنال: Nature Geoscience
سال: 2013
ISSN: 1752-0894,1752-0908
DOI: 10.1038/ngeo2031