Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 70 for “"Equatorial Pacific"”.
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EASTERN EQUATORIAL PACIFIC PRODUCTIVITY VIA TWO GEOCHEMICAL PROXIES
… in response to a dynamic climate. The eastern equatorial Pacific (EEP) is an ideal site for productivity studies due to its high levels of nutrients and deep upwelling. This research examines the phosphorous and barite geochemisty of four EEP sites while also comparing the sites’ glacial and …
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Bioavailable Iron in Equatorial Pacific Ocean Aerosol Samples
… real marine aerosol particles collected over the Equatorial Pacific Ocean, as a function of both sunlight and electron donors (EDs) such as dimethyl sulfide and organic acids. Detection limits were as low as 40 pM Fe(II) and 100 pM H<sub>2</sub>O<sub>2</sub>. Fe(II)in aerosol concentration was …
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Selenium Distribution and Cycling in the Eastern Equatorial Pacific Ocean
<p>Oxygen minimum zones in oceanic waters have become increasingly important to the marine environment and society. Low oxygen waters affect not only the distribution and abundance of marine organisms, but also impact the solubility and transport of trace elements that are of biological importance, …
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Diversity of larval tuna diets across the central equatorial Pacific
… manage tuna stocks in the Western and Central Pacific Ocean, particularly in the context of marine protected areas (MPAs) and no-take zones.
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Exploring the climate change refugia potential of equatorial Pacific coral reefs
… project a 21st century strengthening of the Pacific Equatorial Undercurrent (EUC). The consequent increase in topographic upwelling of cool waters onto equatorial coral reef islands would mitigate warming locally and modulate the intensity of coral bleaching. However, EUC water is potentially …
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Exploring the climate change refugia potential of equatorial Pacific coral reefs
… project a 21st century strengthening of the Pacific Equatorial Undercurrent (EUC). The consequent increase in topographic upwelling of cool waters onto equatorial coral reef islands would mitigate warming locally and modulate the intensity of coral bleaching. However, EUC water is potentially …
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Mechanisms of heat transport through the floor of the equatorial Pacific Ocean
The equatorial Pacific heat flow low, a major oceanic geothermal anomaly centered on the equatorial sediment bulge, was investigated using deeply penetrating heat flow probes (6-11 meters penetration) within three detailed surveys (400 km2) and along over 10,000 km of continuous seismic profiles …
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Rare metal resources in polymetallic nodules from the Eastern Equatorial Pacific Ocean
… fracture zone (CCFZ) in the eastern equatorial Pacific is the area with the greatest interest in terms of metal resources in polymetallic nodules. The nodules are enriched (relative to crustal composition) in economically important metals such as Mn, Ni, Cu, Zn, and so-called critical …
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A Coupled Bio-Optical and Mixed Layer Model for the Equatorial Pacific
… structure and heating of the upper ocean in the Equatorial Pacific Ocean. The bio-optical and mixed layer model for optically pure sea water was forced with climatological environmental conditions to provide a reference simulation for 140°W in the eastern Equatorial Pacific Ocean. This reference …
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Mechanisms of heat transport through the floor of the equatorial Pacific Ocean
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1981.
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Reconstructing Surface Water Carbonate Ion Concentration Changes in the Eastern Equatorial Pacific Across Glacial Transitions
<p>Today, the eastern equatorial Pacific (EEP) plays a critical role in the global CO<sub>2</sub> budget as a major source of CO<sub>2</sub> to the atmosphere, but recent studies suggest the region may shift to a sink for atmospheric CO<sub>2</sub> under different climate states. Here, I focus on …
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Physical Control of Biological Processes in the Central Equatorial Pacific: A Data Assimilative Modeling Study
… trophic levels of the highly dynamic central equatorial Pacific (140°W). Many of the biological processes included in the ecosystem model respond to environmental fluctuations with time scales between one and ten days, which are not typically resolved by basin to global scale circulation …
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Exchanges between hemispheres and gyres : a direct approach to the mean circulation of the equatorial Pacific
… order to determine the mean circulation in the equatorial Pacific, and thus the pathways for cross-equatorial and cross-gyre exchange. Making up the core of the data set are two onetime transpacific zonal sections nominally at 10°N and 14°S. Supplementing these are repeat surveys of the …
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Abyssal polychaete assemblages along latitudinal gradients of productivity in the equatorial Pacific and North Atlantic Oceans
… 12 sites between 4300 and 5000 m in the central Pacific and the north-east Atlantic. In the central Pacific, three of the sites (EqPac 0N, 2N and 5N) were observed to lie under high surface productivity regimes, and they were known to receive significant accumulations of food-rich phytodetrital …
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Modeling the Effects of Physical and Biogeochemical Processes on Phytoplankton Species and Carbon Production in the Equatorial Pacific Ocean
… processes in the Cold Tongue region of the equatorial Pacific Ocean at 0°N, 140°W. This research objective was addressed using a one-dimensional multi-component lower trophic level ecosystem model that includes detailed algal physiology, such as spectrally-dependent photosynthetic processes …
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Physical Controls on Low and Mid-Latitude Marine Primary Productivity
… control of productivity over the subtropical and equatorial Pacific by directly comparing a wide range of contemporaneous metrics, drawn from the modern observational record, for interannual stratification and productivity variability. We find no correlation between the two in the subtropical …
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Precipitation amount, altitude, and moisture trajectory effects on the stable isotopic composition of precipitation in the Galapagos Islands
… proxies, particularly in the eastern equatorial Pacific where stable water isotope observations from precipitation (δ18Op and δDp) are sparse. Here we present a new 28-month record of daily δ18Op and δDp from Santa Cruz, Galápagos. With a prior 13-year record of monthly averaged …
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An investigation into the impacts of the Benguela Niño on rainfall over southern Africa
… anomalies in the South West Indian Ocean/central equatorial Pacific combined with those in the South East Atlantic were performed. These experiments are motivated by the fact that equatorial Pacific/South Indian Ocean SST anomalies of varying signs often occur at the same time as the Benguela Niño …
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