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 104 for “"Annual Cycle"”.
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Annual cycle of the Benguela Jet
… the Jet was investigated. Following this, the annual cycle of the Benguela Jet was investigated using monthly climatological means computed from both remotely sensed and model output data (from the Regional Ocean Modelling System). Two altimeter tracks were identified as best suited to study …
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The Changing Annual Cycle of Sea Surface Temperature
… climate change, multidecadal, decadal, interannual variability, and the increasing extreme events of sea surface temperature. In contrast, the continuous evolution of the reference frame, the annual cycle of SST used to quantify the aforementioned variability and changes, has long been …
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Validation, Analysis of Annual Cycle, and Biogenic Sequestration of CO2, and Modulation of CH4
… was 0.23 ppm. Second, the long-term trend and annual variability of CO2 using satellite retrievals were explored. A multiple regression method was used to estimate CO2 seasonal cycle from the satellite CO2 retrievals and in situ CO2 measurements to better understand surface, mid-tropospheric, …
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Annual cycle and morphology of lice parasitizing two sympatric African small mammals (Micaelamys namaquensis and Elephantulus myurus)
… ectoparasites that spend their entire life cycle on the host. Due to this close relationship, most studies have reported that lice are mainly affected by biotic rather than abiotic factors. Although parasites in general have become the focus of scientific research interest, the life history …
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Studies of the Annual Cycle of the Swallow-Tailed Kite (<em>Elanoides forficatus</em>): Migration, Habitat Use, and Parasites
… populations. I examined three aspects of the annual cycle that could have conservation significance: stopover behavior on Cuba and the Yucatan Peninsula, range-wide habitat associations, and parasites. Because Cuba and the Yucatan Peninsula are situated along the migratory route after a long …
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Moult as a dynamic link in the annual cycle of birds: insights from seabirds and a long-distance migratory raptor
… is one of three major and costly events in the annual cycle of birds, alongside breeding and migration. Unlike breeding and migration, moult is indispensable, and its patterns vary considerably among species. Despite the importance of moult, it has been relatively less studied than breeding or …
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Annual Cycle of Serum Gonadal Steroids and Serum Lipids Associated With Migration of the Striped Mullet, <em>Mugil cephalus</em> L.
… migration. Stimulus for timing the reproductive cycle may be attributed to shortening photoperiod and decreased temperature.
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Links between the Seychelles-Chagos thermocline ridge and large scale climate modes and primary productivity; and the annual cycle of chlorophyll-a
… (ENSO) have also driven significant interannual variation of the depth of 20°C isotherm (D20) and SChl-a in the southern tropical Indian Ocean. A 50-years hindcast (RUN58-07) from a coupled bio-physical model was used to study the SChl-a concentration on an annual time scale and the …
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Modeling Environmental Effects on MSX Prevalence and Intensity in Eastern Oyster (<i>Crassostrea virginica</i>) Populations
… study environmentally-induced variations in the annual cycle of this disease. Simulations with this model were designed to investigate the effect of increased or decreased spring freshwater discharge, the timing of high freshwater runoff, the presence or absence of a fall or late spring …
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Heat Storage and Transport Processes in the Tropical Atlantic Ocean
… an important task. This study examines the annual cycle of the warm water mass formation and its transport in the equatorial Atlantic through the interaction of the atmospheric and oceanic boundary layers. Key features of the model are the sea level wind field, equatorial upwelling rate and …
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Numerical modelling of the coastal ocean off Tanzania
… Ocean Atlas. The model was used to simulate the annual cycle, and the sea surface temperature (SST) output compared with the Tropical Rainfall Measuring Mission (TRMM) Microwave Imager (TMI) sea surface temperature (SST) measurements for the same region. Although broadly comparable, the model SST …
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Studies of Mountain Lake, Virginia with particular reference to physical limnology and profundal bottom fauna
… 1961, 1962, and 1963. It includes data on the annual cycle of physical and chemical events occurring in the lake, and will serve as a point of departure for future, more specialized studies there. Observations made on the profundal bottom fauna of the lake during the same period are also …
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A study of the ecology of the Namaqua Sandgrouse and other arid-zone birds
… demands during different stages of the annual cycle, the timing of breeding seasons and movements in relation to patterns of rainfall-dependent food availability, breeding success and the factors limiting productivity. In addition, the nesting habits and success of 11 coexisting …
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Effects of Diet on Ovarian Development in Largemouth Bass, Micropterus Salmoides
… reproductive system of the female bass over an annual cycle. Changes in body weight , length and gonad weight were observed. Annual changes in plasma concentration of testosterone and 17!3-estradiol were monitored by radioimmunoassay. The relationship between these parameters were significantly …
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Analyzing recent latitudinal and seasonal changes in simulated atmospheric temperatures from a global chemistry-climate model
… seasonal fingerprint in the northern hemisphere annual cycle and structure of warming, but do not specify what forcing agent (e.g. ozone, soot, or greenhouse gases) is responsible for causing it. We further probe this phenomena using 3 ensembles-of-opportunity over 1955-1979 and 1995-2024 of the …
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The influence of volcanic stratospheric aerosols on interannual global climate variations
… This mechanism is based on the normal global annual cycle resulting from the normal annual cycle in the distribution of incoming solar radiation. The presence of a volcanic stratospheric aerosol, which backscatters incoming solar radiation, is hypothesized to trigger the ENSO through an …
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Simulation of variability in the tropical Western Indian Ocean
… (NEMC) in the Tanzanian shelf waters at the annual cycle. Furthermore, the thesis examined the interannual variability of the sea surface temperature (SST) in the Tanzanian shelf region, and compares it with that offshore or with subsurface temperature. At the annual cycle, the …
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LIDAR Studies of the Middle Atmosphere Temperatures and Iron Layer at South Pole
… abundance, height, and width exhibit a strong annual cycle. The Fe and Na densities exhibit strong 12-month oscillations with the amplitudes comparable to the background level, resulting in extremely thin layers and very low abundances during summer. The bottom sides of the Fe and Na layers are …
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Experimental studies of interactions between Zostera marina and the associated benthic fauna
… variation of eelgrass turion length over an annual cycle and determine its correlation to biomass (dry weight); (4) Examine, by means of field experiments, the importance of incident solar irradiation in affecting the seasonal growth of Zostera; and (5) Determine the relationship, if any, …
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