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 43 for “"Eastern Pacific"”.
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Glacial-Interglacial Variability of Eastern Pacific Hydroclimate
… and water resource management in the region. The eastern Pacific is a key modulator of rainfall variability in SWNA. Pacific ocean-atmosphere interactions affect North American monsoon intensity, the seasonal migration of the intertropical convergence zone (ITCZ), the strength, location, and …
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New cytotoxic natural products from North-Eastern Pacific marine invertebrates
An investigation into the chemistry of four species of marine invertebrates which were found to produce cytotoxic crude extracts (ED50 against the L1210 murine leukemia cell line 5 30 pg/mL) led to the isolation of nine new and eleven previously known secondary metabolites. The structures of the …
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Bycatch and foraging ecology of sea turtles in the Eastern Pacific
… of sea turtles and that is also the case in the Eastern Pacific. To establish regional conservation priorities for the mitigation of bycatch, it is essential to first obtain a comprehensive picture of the regional sea turtle bycatch situation. This comprehensive analysis was lacking for the …
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A case study of the formation of an Eastern Pacific tropical cyclone
… the nature of tropical cyclogenesis in the eastern Pacific Ocean. Focus is given to the formation and development of the initial circulation which eventually intensified into Hurricane Fefa. Using satellite imagery, the author studies the development of convective activity in the genesis …
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Community Structure of Methane Cold Seeps in the Western Atlantic and Eastern Pacific
… can sometimes also affect seep communities. The eastern Pacific contains extensive oxygen minimum zones (OMZs), areas where the dissolved oxygen concentration falls below 22 μM, or 0.5 mg/L (Helly and Levin, 2004; Karstensen et al., 2008), as opposed to averages of 180-270 μM (4-6 mg/L) typically …
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The impacts of Amazon deforestation on Pacific climate
Variability in eastern Pacific sea surface temperatures (SSTs) associated with the El Niño Southern Oscillation are known to affect Amazonian precipitation, but to what extent do changing Amazonian vegetation and rainfall impact eastern Pacific SST? The Amazon rainforest is threatened by many …
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Observational Studies of Wave Disturbances in the Tropical Pacific and Their Relationship With Deep Cloud Activity (Global Atmospheric Research Program(garp), Fgge, Gate, Itcz, Spcz, Sst)
… Discussion is focused on the situations in the eastern Pacific for the following reasons: (a) this is the area where strong deep convection frequently develops in the northern summer, (b) it is also an area which has been least explored meteorologically.
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Mechanisms for the wet and dry years over Eritrea during the summer rainfall season
… been found that the pattern of the SST along the eastern Pacific and the Indian oceans seem to influence the occurrence of the anomaly rainfall years. Correlation analysis shows that Eritrean summer rainfall is more strongly correlated with the eastern Pacific and Indian Oceans SST. Thus, the …
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MECHANISMS FOR THE EXISTENCE OF DIAGONAL SOUTHERN HEMISPHERE CONVERGENCE ZONES
… diagonal, orientation of the South Pacific and South Atlantic Convergence Zones (SPCZ and SACZ, respectively) which provide vital precipitation locally and influence mean climate globally. Their basic formation mechanism is not fully understood. A conceptual framework is developed to …
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Hybridization And Introgression In Marine Invertebrates: Population Genomics Of Phymactis Papillosa And Asterias Sea Stars
… DNA sequencing (RADseq) SNP data for the eastern Pacific sea anemone <em>Phymactis</em> <em>papillosa</em> and whole genome sequencing (WGS) data for the North Atlantic sea stars <em>Asterias rubens</em> and <em>Asterias forbes</em>i. For each system, I applied coalescent-based species …
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A Study of Asian Dust Events Using Surface, Satellite, and Aircraft Measurements During Intex-B
… much larger scale. To further quantify the transpacific transport and evolution of Asian dust to North America and assess the impact on regional climate, NASA led a field experiment called the Intercontinental Chemical Transport Experiment - Phase B (INTEX-B) during April-May 2006 over the …
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Population Size of Blue-footed Boobies in Galápagos: Evaluation of Indications of Population Decline
… mostly absent from the diet. Elsewhere in the eastern Pacific, sardines have decreased dramatically in abundance by natural processes in the last 15 years, as part of a well-documented and apparently natural cycle. This cyclic change in abundance provides an explanation for the recent …
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Exchanges between hemispheres and gyres : a direct approach to the mean circulation of the equatorial Pacific
… 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 equatorial currents …
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Modeling of Potential Historical Tsunamis from Large Earthquakes in the Izu-Bonin Mariana Subduction Zone
… of wave heights at locations around the Pacific Basin that have the potential for written records dating back to the 1500s (such as western Pacific cities like Manila, Philippines and Hong Kong and eastern Pacific cities like Concepcion, Chile; Lima, Peru; and Acapulco, Mexico). The …
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Spatial and temporal population genetics at deep-sea hydrothermal vents along the East Pacific Rise and Galápagos Rift
… have been well documented along the East Pacific Rise and the Galápagos Rift. To analyze spatial and temporal population genetic patterns and the processes governing them at ephemeral and disjunct habitats, a suite of 12 highly variable microsatellite DNA markers were developed for this …
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Assessment of Genetic Diversity in Largetooth Sawfish, Pristis pristis, Populations Over the 20th Century
… N=9; 0.813, N=54; 0.771, N=99). The Indo-West Pacific and Atlantic/Eastern Pacific each harbor genetically distinct lineages of <em>P. pristis</em>. Historic (<em>i.e.</em> pre 2000) genetic diversity indices were estimated at each fragment for <em>P. pristis</em> on a global level (averaged at …
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The tectonic evolution of the North Central Caribbean plate margin
… motions of the North and South Americas and the eastern Pacific plates. Thus, the pre-Tertiary history of the region is one of simple convergence. This contrasts with the complex tectonism of primary translation, with secondary convergence and divergence during the Tertiary. The ancestral Greater …
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Enabling robotic manipulation in remote environments with shared autonomy
… at more than 1000 meters water depth in the Eastern Pacific with centimeter-level precision by remote scientists with no prior piloting experience. This demonstration provides compelling evidence of SHARC’s utility for conducting delicate operations in unstructured environments across …
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Assessment of flagellate diversity at deep-sea hydrothermal vents using the combined approach of culture-dependent and culture-independent methods
… from four deep-sea hydrothermal vents in the Eastern Pacific Ocean: Juan de Fuca Ridge, Guaymas Basin, and both 21°N and 9°N on the East Pacific Rise (EPR). The hydrothermal vent flagellates belonged to six different taxonomic orders: the Ancyromonadida, Bicosoecida, Cercomonadida, …
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