Browsing by Author "Nielsen-Gammon, John"
Now showing items 21-40 of 76
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Blake, Jennifer (2014-09-17)The Southeast United States has experienced suppressed warming compared with the rest of the country since the early part of the 20th century. This region has also undergone drastic land use/land cover changes – from ...
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Aksoy, Altug; Zhang, Fuqing; Nielsen-Gammon, John (2016-10-28)The performance of the ensemble Kalman filter (EnKF) in forced, dissipative flow under imperfect-model conditions is investigated through simultaneous state and parameter estimation where the source of model error is the ...
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Nielsen-Gammon, John (2002-02-05)This report is an evaluation of the quality of MM5 simulations of weather phenomena during the August 2000 Houston-Galveston Ozone episode. The report serves two purposes: first, to help guide final selection of a model ...
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Evaluation of Planetary Boundary Layer Scheme Sensitivities for the Purpose of Parameter Estimation Hu, Xiao-Ming; Nielsen-Gammon, John; Zhang, Fuqing; Pleim, Jonathan (American Meteorological Society, 2010-09-01)Meteorological model errors caused by imperfect parameterizations generally cannot be overcome simply by optimizing initial and boundary conditions. However, advanced data assimilation methods are capable of extracting ...
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Hu, Xiao-Ming; Nielsen-Gammon, John; Zhang, Fuqing (American Meteorological Society, 2010-09-01)Accurate depiction of meteorological conditions, especially within the planetary boundary layer (PBL), is important for air pollution modeling, and PBL parameterization schemes play a critical role in simulating the boundary ...
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Clemonds, Matthew A (Texas A&M University, 2006-10-30)Population growth and urban sprawl have contributed to the formation of significant urban heat island phenomena in Houston, Texas, the fourth largest city in the United States. The population growth in Houston was 25.8% ...
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McRoberts, Brent; Nielsen-Gammon, John (2016-10-28)The future of ecosystems in the Big Bend region of the Chihuahuan Desert largely depends on the response to future droughts. Most of the precipitation in the region falls in the 6-month period from May to October due in ...
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Collins, Kathleen Jo (2009-06-02)El Niño is typically viewed as an episode of destructive weather anomalies that can last from a few months to several years. The majority of research looks at the negative impacts of this event. However, not all impacts ...
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Nordfelt, Anna Marie (2009-05-15)Due to the effects urbanization has on land-use and land cover change (LULC), urban areas have a major influence on the environment. The strong coupling between the land and atmosphere can alter the microclimatology of ...
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Nielsen-Gammon, John (2001-12-09)This report describes MM5 modeling work to date at Texas A&M University, sponsored by the Texas Natural Resource Conservation Commission, with the goal of an accurate, fully validated meteorological simulation delivered ...
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Fiaz Ahmed Rafi Ahmed, . (2016-11-29)The interaction between moist convection and the environment that engenders it is a problem that spans multiple scales. In this study, the problem is approached using a suite of observational and modeling tools. The first ...
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Myoung, Boksoon (2009-05-15)Since Texas normally receives most of its precipitation in the warm season, precipitation deficits in summertime may bring serious agricultural and hydrological disasters. While the underlying physical processes of summer ...
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Ford, Trenton W. (2013-03-06)and-atmosphere interactions are an important component of climate, especially in semi-arid regions such as the Southern Great Plains. Interactions between soil moisture and vegetation modulate land-atmosphere coupling and ...
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Ganesh, Srinivasan (2009-05-15)The relationship between the satellite-based Vegetation Condition Index (VCI) and frequently used agricultural drought indices like Palmer Drought Severity Index, Palmer’s Z-index, Standard Precipitation Index, percent ...
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Steinweg-Woods, Jesse Matthew (2016-04-12)Oceanic eddies, approximately 80 km in diameter in the mid-latitude Atlantic Ocean, are frequently generated along the Gulf Stream. These eddies contain a sea surface temperature anomaly as they spin and break away from ...
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Butler, Sydney Nicole (2023-02-08)Although Hurricanes Harvey (2017) and Nicholas (2021) both rapidly intensified before making landfall in the populous and highly convective region of southeast Texas, the tropical systems exhibited different lightning-pr ...
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Doner, Yavuz (2018-11-19)The stress on water resources is more critical in drylands due to ecological and climatological changes. Because upscaling the findings of paired-catchment studies to larger watersheds is difficult, hydrological models ...
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Igau, Richard; Nielsen-Gammon, John (American Meteorologial Society, 1998-11-01)The evolution of the southerly low-level jet (LLJ) during a return flow event is studied using output from the Penn State/NCAR Mesoscale Model (Version 4). Three geographically different southerly LLJs develop in the ...
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Studwell, Aaron; Nielsen-Gammon, John (National Weather Service, 1995-04)
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Odins, Andrew Michael (Texas A&M University, 2005-02-17)During the period of June 29 through July 6, 2002, an extreme precipitation event occurred over Texas, resulting in catastrophic flooding. Operational forecasts performed poorly, neither predicting the copious amounts of ...