Browsing OU - Dissertations by Author "Xiao, Xiangming"
Now showing items 1-20 of 25
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Breeding and migration ecology of bar-headed goose Anser indicus and swan goose Anser cygnoides in Asia
Batbayar, Nyambayar (2013-12)Most waterfowl that breed in Mongolia, part of the semiarid northern region of East Asia, are long distant migrants. They depend on availability of lake, river, and wetland habitats on their breeding and wintering grounds ... -
CARBON-WATER COUPLING OF TERRESTRIAL ECOSYSTEMS IN RESPONSE TO CLIMATE CHANGE AND CLIMATE VARIABILITY
Du, Ling (2019-05-10)Carbon and water cycles are two fundamental biophysical processes in terrestrial ecosystems. Rain use efficiency (RUE), defined as the ratio of ecosystem productivity to precipitation (PPT), and water use efficiency (WUE), ... -
The Changing Hydroclimate of the United States Great Plains: Meteorological and Climatological Impacts on Water Resources
Flanagan, Paul (2018-12-14)In the United States Great Plains (GP), understanding precipitation variability is key in developing an understanding of the present and future availability of water in the region. Numerous studies have investigated the ... -
DIAGNOSTIC ANALYSIS OF TERRESTRIAL GROSS PRIMARY PRODUCTIVITY USING REMOTE SENSING AND IN SITU OBSERVATIONS
Zhang, Yao (2017-12)Vegetation play a critical role in the interactions between atmosphere and biosphere. CO2 fixed by plants through photosynthesis process at ecosystem scale is termed as gross primary production (GPP). It is also the first ... -
Disentangling the relative contribution of land-atmosphere coupling toward the evolution of extreme events
Wakefield, Ryann (2021-05-14)The Great Plains region is characterized by highly variable and often extreme precipitation. Devastating multi-year droughts are common in the region, and can often be followed by years of above normal precipitation. Drought ... -
ECOSYSTEM RESPONSES TO CLIMATE VARIABILITY AND MANAGEMENT PRACTICES: DROUGHT ASSESSMENT (REMOTE SENSING), FIELD MEASUREMENTS (EDDY COVARIANCE) AND MODELING (DNDC)
Bajgain, Rajen (2017-12-15)Climate variability and management practices in isolation or in combination influence the properties of ecosystems and the flows of energy and materials through them. The goal of this dissertation is to better understand ... -
The effects of precipitation, tree size, and stand density on water use and drought tolerance of eastern redcedar in Oklahoma, USA
Giddens, Jonathan (2021-05-14)Plant woody encroachment and its effects on the local water budget have become of increasing concern globally as woody plants continue to expand their geographic range into grasslands at a faster rate each year. In the ... -
Expanding In-situ Surface Water Quality Monitoring Techniques for Optically Complex Inland Waters Utilizing small Unoccupied Aerial Systems (sUAS)
Holzbauer-Schweitzer, Brandon (2021-05-14)Remote sensing is described as the art and science of interpreting information (e.g., reflectance) collected from a target object (e.g., vegetation) using technology (e.g., satellites, occupied aircraft, and small unoccupied ... -
Flash Droughts: A Local to Global Analysis of Rapid Drought Intensification and their Associated Impacts
Christian, Jordan (2020-12)Flash drought is characterized by the rapid intensification toward drought conditions and is primarily associated with detrimental impacts to agricultural production. Unlike conventional (slowly developing) drought, flash ... -
Geospatial Modeling of Surface Water Trends Using Time Series and Image Observation Analysis
Hasan, Emad (2017)This study addresses the impact of climate change on the Nile River Basin (NRB) and its downstream delta, the Nile Delta of Egypt. The NRB region undergoes a huge fluctuation in precipitation and temperatures from year-to-year. ... -
High-resolution Satellite-based Modeling and Assessment of Gross Primary Production over Agroecosystems for Precision Agriculture
Celis, Jorge A. (2023-12-15)Sustainable agriculture stands at the forefront of the global sustainable development strategic goals (SDGs), targeting the needs of increasing production to meet the growing food demands and to ensure profitability for ... -
HYBRID EN3DVAR RADAR DATA ASSIMILATION AND COMPARISONS WITH 3DVAR AND ENKF WITH OSSES AND A REAL CASE
Kong, Rong (2017-12)Studies have shown advantages of the hybrid ensemble-variational data assimilation (DA) algorithms over pure ensemble or variational algorithms, although such advantages at the convective scale, in the presence of complex ... -
THE IMPACTS CLIMATE VARIABILITY AND ANTHROPOGENIC ACTIVITY ON TERRESTRIAL ECOSYSTEM CARBON CYCLING
Doughty, Russell (2019-12)There is a near consensus among climate scientists that global temperatures are rising, climate variability will increase, and climate extremes will become more extreme. What is debated, however, is how terrestrial ecosystems ... -
IMPROVING GLOBAL CARBON CYCLE MODELS WITH OBSERVATIONS
Hararuk, Oleksandra (2014-05)In the future warming world terrestrial ecosystems may mitigate increasing temperatures by sequestering CO₂ from the atmosphere, or they can intensify future global change, amplifying the rate of CO₂ production in response ... -
INTELLIGENT CYBERINFRASTRUCTURE FOR BIG DATA ENABLED HYDROLOGICAL MODELING, PREDICTION, AND EVALUATION
Wan, Zhanming (2015)Most hydrologic data are associated with spatiotemporal information, which is capable of presenting patterns and changes in both spatial and temporal aspects. The demands of retrieving, managing, analyzing, visualizing, ... -
INVESTIGATING THE IMPACTS OF ANTHROPOGENIC AND CLIMATIC CHANGES ON THE STEPPE ECOSYSTEM IN CHINA’S LOESS PLATEAU AND THE MIXED-GRASS PRAIRIE REGION IN SOUTHWEST OKLAHOMA, USA
Yan, Dong (2014-08-15)Grassland ecosystems occupy approximately 40% of the earth’s terrestrial area and represent one of most important ecosystems on Earth in terms of its impacts on global food supply, carbon sequestration and maintaining ... -
LANDSCAPE HETEROGENEITY AND SPATIO-TEMPORAL RESOLUTION CONSIDERATIONS FOR MAPPING LAND COVER CHANGES
Tran, Trung (2013)Land cover is changing dramatically worldwide from both anthropogenic and natural drivers. In the United States, the rates and types of land cover change have varied temporally due to government policy, environmental ... -
Machine learning enabled query re-optimization algorithms for cloud database systems
Wang, Chenxiao (2021-12)In cloud database systems, hardware configurations, data usage, and workload allocations are continuously changing. These changes make it difficult for the query optimizer to obtain an optimal query execution plan (QEP) ... -
Modelling terrestrial carbon fluxes and crop production with remote sensing and in-situ observations
Wu, Xiaocui (2020-08-20)Plants fix carbon through photosynthesis, sequestering carbon dioxide from the atmosphere and substantially mitigating the climate warming effect induced by anthropogenic CO2 emissions. Terrestrial gross primary production ... -
MULTI-SCALE REMOTE SENSING OF OPEN SURFACE WATER BODY AREA AND QUALITY
Zou, Zhenhua (2019-05-10)Water is one of the most important resources for life. Climate change and climate variability have caused dramatic variations and significant trends in surface water resources, while global population growth and increased ...