Oxygen distribution and aerobic respiration in the north and south eastern tropical Pacific oxygen minimum zones
نویسندگان
چکیده
منابع مشابه
Aerobic Microbial Respiration In Oceanic Oxygen Minimum Zones
Oxygen minimum zones are major sites of fixed nitrogen loss in the ocean. Recent studies have highlighted the importance of anaerobic ammonium oxidation, anammox, in pelagic nitrogen removal. Sources of ammonium for the anammox reaction, however, remain controversial, as heterotrophic denitrification and alternative anaerobic pathways of organic matter remineralization cannot account for the am...
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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Microbial communities play central roles in ocean biogeochemical cycles, and are particularly important in in oceanic oxygen minimum zones (OMZs). However, the key carbon, nitrogen, and sulfur (S) cycling processes catalyzed by OMZ microbial communities are poorly constrained spatially, temporally, and with regard to the different microbial groups involved. Here we sample across dissolved oxyge...
متن کاملSize-fractionated diversity of eukaryotic microbial communities in the Eastern Tropical North Pacific oxygen minimum zone.
Oxygen minimum zones (OMZs) caused by water column stratification appear to expand in parts of the world's ocean, with consequences for marine biogeochemical cycles. OMZ formation is often fueled by high surface primary production, and sinking organic particles can be hotspots of interactions and activity within microbial communities. This study investigated the diversity of OMZ protist communi...
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...
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ژورنال
عنوان ژورنال: Deep Sea Research Part I: Oceanographic Research Papers
سال: 2014
ISSN: 0967-0637
DOI: 10.1016/j.dsr.2014.10.001