Oxygen minimum zones in the eastern tropical Atlantic and Pacific oceans
نویسندگان
چکیده
منابع مشابه
Contrasting biogeochemistry of nitrogen in the Atlantic and Pacific Oxygen Minimum Zones
We present new data for the stable isotope ratio of inorganic nitrogen species from the contrasting oxygen minimum zones (OMZs) of the Eastern Tropical North Atlantic, south of Cape Verde, and the Eastern Tropical South Pacific off Peru. Differences in minimum oxygen concentration and corresponding N-cycle processes for the two OMZs are reflected in strongly contrasting δ15N distributions. Paci...
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[1] Observations and model results both indicate increasing oxygen minimum zones (OMZ) in the tropical oceans. Here we report on record low dissolved oxygen minimum concentrations in the eastern tropical North Atlantic in fall of 2008, with less than 40 mmol kg 1 in the core of the OMZ. There we find a deoxygenation rate of 0.5 mmol kg 1 a 1 during the last decades on two repeat sections at 7.5...
متن کاملWhat prevents nitrogen depletion in the oxygen minimum zone of the eastern tropical South Pacific?
Local coupling between nitrogen fixation and denitrification in current biogeochemical models could result in runaway feedback in open-ocean oxygen minimum zones (OMZs), eventually stripping OMZ waters of all fixed nitrogen. This feedback does not seem to operate at full strength in the ocean, as nitrate does not generally become depleted in open-ocean OMZs. To explore in detail the possible me...
متن کاملA dissolved cobalt plume in the oxygen minimum zone of the eastern tropical South Pacific
Cobalt is a nutrient to phytoplankton, but knowledge about its biogeochemical cycling is limited, especially in the Pacific Ocean. Here, we report sections of dissolved cobalt and labile dissolved cobalt from the US GEOTRACES GP16 transect in the South Pacific. The cobalt distribution is closely tied to the extent and intensity of the oxygen minimum zone in the eastern South Pacific with highes...
متن کاملOxygen minimum zone expansion in the eastern tropical North Pacific during deglaciation
[1] During deglaciation at 17 ka the intensity and footprint of the oxygen minimum zone (OMZ) increased in the Eastern Tropical North Pacific (ETNP) before a subsequent expansion on the California Margin. Evidence for the earlier increase is found in trace metal concentrations, lamination preservation and dN values from cores located between 540–750 m water depth in the Gulf of Tehuantepec, Sou...
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ژورنال
عنوان ژورنال: Progress in Oceanography
سال: 2008
ISSN: 0079-6611
DOI: 10.1016/j.pocean.2007.05.009