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 170 for “"inter-annual"”.
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Inter-annual stability of land cover classification: explorations and improvements
Land cover information is a key input to many earth system models, and thus accurate and consistent land cover maps are critically important to global change science. However, existing global land cover products show unrealistically high levels of year-to-year change. This thesis explores methods …
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Inter-annual variability of acoustic ray travel times in the northeast Pacific
… times are analyzed in order to investigate inter-annual basin-scale thermal variability. These thermal fluctuations may help detect any greenhouse warming and greater understanding of them will increase knowledge of ocean-atmosphere interactions which affect weather and climate. A discussion …
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HF Radar Observations of Inter-Annual variations in Mid-Latitude Mesospheric Winds
… (QBO) is known to be an important source of inter-annual variability at mid and high latitudes in both hemispheres. Coupling between QBO and the polar vortex has been extensively studied over the past few decades, however, less is known about QBO influences in the mid-latitude mesosphere. One …
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Seasonal and inter-annual variability of SST and chlorophyll-a off Angola
The aim of this dissertation is to use satellite-derived images for the study of spatial and temporal variations in SST and in concentration of surface chlorophyll-a of the main oceanographic features off Angola. SST time-series over the 1987 to 2002 were derived from Meteosat 5-day SST composites …
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Inter-Annual to Inter-Decadal Variability of Upwelling and Anchovy Population off Northern Chile
… ENSO (3–8 years), decadal (9–12 years), and interdecadal (13–25 years). The origin of quasi-biennial variability could be explained by means of the Delayed Oscillator Mode. The STL trend shows three regime changes: before 1976 (cold), between 1976 and 1998 (warm), and after 1998 (cold). These …
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The influence of temporal detail and inter-annual resource variability on energy planning models
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-11 without embargo terms
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Mechanisms of inter-annual rainfall variability over tropical highlands of Africa and its predictability potential
… being standardized. The data are analyzed for annual cycle and the departure therefrom (i.e. Inter-annual fluctuations). The time-varying spectral energy nature of time series is investigated using wavelet analysis technique. PCA (with annual cycle) yielded 12 and 7 homogeneous rainfall and …
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The inter-annual variability in the onset of the enhanced chlorophyll-a east of Madagascar
… The wavelet analysis revealed a semi-annual signal for 2006 and 2008 and an annual one in 2004 due to the gradual decline in the concentration of chlorophyll-a. The transport of the bloom is affected by the passage of eddies where the concentration of chlorophyll-a is higher in the …
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Inter-annual and decadal variation in the pelagic marine ecosystem of the Yellow and East China seas
… and 15.8 x 10 4 tonC d-1 in September, and the annual total primary production in the Yellow Sea was 50.1 x 106 tonC yr-1. The resulting maps of primary production calculated from the remotely sensed data provide the first synoptic views of primary production in the Yellow Sea. (Abstract …
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Satellite-based estimates of net radiation and modeling the role of topography and vegetation on inter-annual hydro-climatology
The Fourth Assessment Report of the Intergovernmental Panel on Climate Change acknowledged that the lack of relevant observations in various regions of the world is a crucial gap in understanding and modeling impacts of climate change related to hydrologic cycle. The Surface Radiation Budget (SRB) …
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Optimising the stream habitat assessment for the Bay of Plenty Regional Council : a thesis presented in partial fulfilment of the requirements for the degree of Master of Science in Conservation Biology at Massey University, Palmerston North, New Zealand
… the year-to-year change of the surveying team (inter-annual observer variability) could influence the BOP NERMN stream habitat monitoring results. In this thesis, I aimed to determine whether omitting quantitative metrics and using only qualitative metrics could be an appropriate option for …
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Satellite derived sea surface temperature and wind field variability in the Benguela upwelling region
… SST and the upwelling favorable wind conditions. Inter-annual variability is common, and with these datasets it was possible to highlight periods of anomalous conditions. Results indicated that both the seasonal and inter-annual variability between the northern and southern parts of the Benguela …
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Precipitation variability and change over Morocco and the Mediterranean
… In addition to strong seasonality and high inter-annual variability, annual precipitation remains low (<500mm) across much of the region. Furthermore, the situation is not expected to improve under climate change as models project a sustained decline in precipitation in the Mediterranean, …
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Variability of coastal upwelling south of Madagascar
… The second part of the thesis focuses on the interaction between the intrusion of warm water from Mozambique channel and the upwelling cell in Core 2. Cruise datasets, satellite remote sensing observations and model data analyses are combined to highlight the existence of a coastal surface …
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Interannual thermal-regime variability of two lakes in British Columbia, Canada : implications for climate change
This study examines the inter-annual variability of the thermal regime of two lakes, Quesnel Lake a very long residence-time lake and Kamloops Lake a short residence-time river-dominated lake. The changes are compared to local climate conditions as well as inter-annual variability associated with …
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Variability within the 10-year pollen rain of a seasonal neotropical forest
The effect of seasonal and multiannual environmental variability on the abundance and composition of Neotropical pollen rain was investigated using ten years of seasonal aerial pollen samples from Barro Colorado Island (BCI), Panama. Using canonical correspondence analysis, we identified the …
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Sea surface temperature trends around Southern Africa (focusing on the Benguela Current system and the Agulhas retroflection area)
… are used to calculate yearly time series, inter-annual fluctuations and trends in key oceanic regions of southern Africa. OI SST, Hadley SST, NOCS SST and ER SST (which has 2° x 2° resolution) are used in this study. I start calculating trends and inter- annual fluctuations for various …
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Flood risk modeling and impact assessment using google earth engine in Mpumalanga province, South Africa
… a detailed assessment of flood events and an inter-annual analysis covering the period 2020-2024. Firstly, a flood event assessment was conducted (February 2023 flood) using threshold-based change detection methods applied to Sentinel-1 Synthetic Aperture Radar (SAR) data to map the spatial …
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Key mechanisms of surface water pCO2 variability in the North Atlantic Ocean
… height from altimetry. In conjunction with the winter North Atlantic Oscillation (NAO) index, statistical analysis has been applied to understand the key mechanisms of surface water partial pressure of CO2 (pCO2) variability, both on the seasonal and inter-annual timescale. With respect to the …
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