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- Creators: Cerveny, Randall S.
Description
The characteristics of the wintertime 500hPa height surface, the level of non-divergence and used for identifying/observing synoptic-scale features (ridges and troughs), and their impact on precipitation are of significance to forecasters, natural resource managers and planners across the southwestern United States. For this study, I evaluated the location of the 500hPa mean Pacific ridge axis over the winter for the period of 1948/49 to 2011/12 and derived the mean ridge axis in terms of location (longitude) and intensity (geopotential meters) from the NCEP/NCAR Reanalysis dataset. After deriving a mean ridge axis climatology and analyzing its behavior over time, I correlated mean location and intensity values to observed wintertime precipitation in select U.S. Climate Divisions in Arizona, Colorado, Nevada, Utah and New Mexico. This resulted in two findings. First specific to the 500hPa ridge behavior, the ridge has been moving eastward and also has been intensifying through time. Second, results involving correlation tests between mean ridge location and intensity indicate precipitation across the selected Southwest Climate Divisions are strongly related to mean ridge intensity slightly more than ridge location. The relationships between mean ridge axis and observed precipitation also are negative, indicating an increase of one of the ridge parameters (i.e. continued eastward movement or intensification) lead to drier winter seasons across the Southwest. Increased understanding of relationships between upper-level ridging and observed wintertime precipitation aids in natural resource planning for an already arid region that relies heavily on winter precipitation.
ContributorsNolte, Jessica Marie (Author) / Cerveny, Randall S. (Thesis advisor) / Selover, Nancy J. (Committee member) / Brazel, Anthony J. (Committee member) / Arizona State University (Publisher)
Created2013
Description
The Mimbres tradition of southwestern New Mexico, underwent what can be characterized as continuity with change, a form of non-collapse transformation, from the Late Pithouse (ca. 550-1000 CE) to Classic (ca. 1000-1130 CE) period. Both transitions are characterized by large-scale shifts in housing, settlement patterns, pottery, and mortuary customs.The goal of this thesis is to evaluate changes in the intrasite and inter-site frequencies of selected nonlocal items in Mimbres burial contexts dating to the Late Pithouse and Classic periods. Because those living in the Mimbres region seem to have dramatically changed the ways in which they lived and expressed their social identities it is reasonable to assume that their mortuary use of these high-value objects might have also transformed.
ContributorsOwen, Paige Elizabeth (Author) / Nelson, Ben (Thesis director) / Nelson, Margaret (Committee member) / Russell, Will (Committee member) / Barrett, The Honors College (Contributor) / Walter Cronkite School of Journalism and Mass Communication (Contributor) / School of Human Evolution and Social Change (Contributor)
Created2013-12