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Articles 481 - 489 of 489
Full-Text Articles in Environmental Sciences
Application Of Satellite Data To Model Storm Runoff Into Rosamond Dry Lake, Mridul Oli
Application Of Satellite Data To Model Storm Runoff Into Rosamond Dry Lake, Mridul Oli
LMU Theses and Dissertations
Antelope Valley is situated in Southern California and is bounded by the Tehachapi and the San Gabriel Mountains. It stretches over 2,200 mi2 and encompasses Rosamond Dry Lake and the 1,200 mi2 watershed draining into it. The cities of Lancaster and Palmdale are the two major urban centers that lie in the watershed draining into Rosamond Dry Lake. The lake lies within the vicinity of the Edwards Air Force Base and provides an important site for aviation research and test operations in addition to ecosystem services. Hence, it is necessary to balance the need to remove water from the lake …
Exploration Of Climate Influences On The Abundance Of Galls On Red Willow (Salix /Aevigata) Across Two Riparian Communities In Southern California, Victor D. Carmona-Galindo, Rachael Sears, Tauras P. Vilgalys, Emily Hand, Sara Morledge-Hampton
Exploration Of Climate Influences On The Abundance Of Galls On Red Willow (Salix /Aevigata) Across Two Riparian Communities In Southern California, Victor D. Carmona-Galindo, Rachael Sears, Tauras P. Vilgalys, Emily Hand, Sara Morledge-Hampton
Biology Faculty Works
In Southern California, the red willow (Sa/ix laevigata Bebb) hosts a variety of gall-inducing parasitic insects. However, little is known about the ecology of these parasites, particularly the characterization of their microclimate preferences. This study explores the relationship between microclimate and gall frequencies in S. laevigata in the Ballona Wetlands and Temescal Canyon, and gall count correlated with biotic and abiotic factors such as soil pH, soil moisture and willow density. Significantly more galls per leaf were found at Temescal Canyon than Ballona Wetlands. Although the number of galls per leaf correlated negatively with soil pH, soil moisture content and …
The Blue Sapphire Of The Mind: Notes For A Contemplative Ecology, Douglas E. Christie
The Blue Sapphire Of The Mind: Notes For A Contemplative Ecology, Douglas E. Christie
Faculty Pub Night
No abstract provided.
Metals And Bacteria Partitioning To Various Size Particles In Ballona Creek Storm Water Runoff, John Dorsey, Jeffrey S. Brown, Eric D. Stein, Drew Ackerman, Jessica Lyon, Patrick M. Carter
Metals And Bacteria Partitioning To Various Size Particles In Ballona Creek Storm Water Runoff, John Dorsey, Jeffrey S. Brown, Eric D. Stein, Drew Ackerman, Jessica Lyon, Patrick M. Carter
Civil and Environmental Engineering Faculty Works
Many storm water best management practice (BMP) devices function primarily by capturing particulate matter to take advantage of the well-documented association between storm water particles and pollutants. The hydrodynamic separation or settling methods used by most BMP devices are most effective at capturing medium to large particles; however, these may not be the most predominant particles associated with urban runoff. The present study examined particle size distribution in storm water runoff from an urban watershed in southern California and investigated the pollutant-particle associations of metals (Cu, Pb, Ni, and Zn) and bacteria (enterococci and Escherichia coli). During small storm events …
Suppression Of South Asian Summer Monsoon Precipitation In The 21st Century, Moetasim Ashfaq, Ying Shi, Wen-Wen Tung, Robert J. Trapp, Xueijie Gao, Jeremy S. Pal, Noah S. Diffenbaugh
Suppression Of South Asian Summer Monsoon Precipitation In The 21st Century, Moetasim Ashfaq, Ying Shi, Wen-Wen Tung, Robert J. Trapp, Xueijie Gao, Jeremy S. Pal, Noah S. Diffenbaugh
Civil and Environmental Engineering Faculty Works
We used a high-resolution nested climate modeling system to investigate the response of South Asian summer monsoon dynamics to anthropogenic increases in greenhouse gas concentrations. The simulated dynamical features of the summer monsoon compared well with reanalysis data and observations. Further, we found that enhanced greenhouse forcing resulted in overall suppression of summer precipitation, a delay in monsoon onset, and an increase in the occurrence of monsoon break periods. Weakening of the large-scale monsoon flow and suppression of the dominant intraseasonal oscillatory modes were instrumental in the overall weakening of the South Asian summer monsoon. Such changes in monsoon dynamics …
Future Changes In Snowmelt-Driven Runoff Timing Over The Western Us, Sara A. Rauscher, Jeremy S. Pal, Noah S. Diffenbaugh, Michael M. Benedetti
Future Changes In Snowmelt-Driven Runoff Timing Over The Western Us, Sara A. Rauscher, Jeremy S. Pal, Noah S. Diffenbaugh, Michael M. Benedetti
Civil and Environmental Engineering Faculty Works
We use a high-resolution nested climate model to investigate future changes in snowmelt-driven runoff (SDR) over the western US. Comparison of modeled and observed daily runoff data reveals that the regional model captures the present-day timing and trends of SDR. Results from an A2 scenario simulation indicate that increases in seasonal temperature of approximately 3° to 5°C resulting from increasing greenhouse gas concentrations could cause SDR to occur as much as two months earlier than present. These large changes result from an amplified snow-albedo feedback driven by the topographic complexity of the region, which is more accurately resolved in a …
Changes In Severe Thunderstorm Environment Frequency During The 21st Century Caused By Anthropogenically Enhanced Global Radiative Forcing, Robert J. Trapp, Noah S. Diffenbaugh, Harold E. Brooks, Michael E. Baldwin, Eric D. Robinson, Jeremy S. Pal
Changes In Severe Thunderstorm Environment Frequency During The 21st Century Caused By Anthropogenically Enhanced Global Radiative Forcing, Robert J. Trapp, Noah S. Diffenbaugh, Harold E. Brooks, Michael E. Baldwin, Eric D. Robinson, Jeremy S. Pal
Civil and Environmental Engineering Faculty Works
Severe thunderstorms comprise an extreme class of deep convective clouds and produce high-impact weather such as destructive surface winds, hail, and tornadoes. This study addresses the question of how severe thunderstorm frequency in the United States might change because of enhanced global radiative forcing associated with elevated greenhouse gas concentrations. We use global climate models and a high-resolution regional climate model to examine the larger-scale (or “environmental”) meteorological conditions that foster severe thunderstorm formation. Across this model suite, we find a net increase during the late 21st century in the number of days in which these severe thunderstorm environmental conditions …
Connection Between Spring Conditions And Peak Summer Monsoon Rainfall In South America: Role Of Soil Moisture, Surface Temperature, And Topography In Eastern Brazil, Alice M. Grimm, Jeremy S. Pal, Filippo Giorgi
Connection Between Spring Conditions And Peak Summer Monsoon Rainfall In South America: Role Of Soil Moisture, Surface Temperature, And Topography In Eastern Brazil, Alice M. Grimm, Jeremy S. Pal, Filippo Giorgi
Civil and Environmental Engineering Faculty Works
A link between peak summer monsoon rainfall in central-east Brazil, composing part of the South American monsoon core region, and antecedent conditions in spring is disclosed. Rainfall in this region during part of spring holds a significant inverse correlation with rainfall in peak summer, especially during ENSO years. A surface–atmosphere feedback hypothesis is proposed to explain this relationship: low spring precipitation leads to low spring soil moisture and high late spring surface temperature; this induces a topographically enhanced low-level anomalous convergence and cyclonic circulation over southeast Brazil that enhances the moisture flux from northern and central South America into central-east …
Storm Effects On Regional Beach Water Quality Along The Southern California Shoreline, Rachel T. Nobel, Stephen B. Weisberg, Molly K. Leecaster, Charles D. Mcgee, John Dorsey, Patricia Vainik, Victoria Orozco-Borbón
Storm Effects On Regional Beach Water Quality Along The Southern California Shoreline, Rachel T. Nobel, Stephen B. Weisberg, Molly K. Leecaster, Charles D. Mcgee, John Dorsey, Patricia Vainik, Victoria Orozco-Borbón
Civil and Environmental Engineering Faculty Works
Two regional studies conducted during dry weather demonstrated that the Southern California Bight (SCB) shoreline has good water quality, except near areas that drain land-based runoff. Here, we repeat those regional studies 36 h after a rainstorm to assess the influence of runoff under high flow conditions. Two hundred and fifty-four shoreline sites between Santa Barbara, California and Ensenada, Mexico were sampled using a stratified-random sampling design with four strata: sandy beaches, rocky shoreline, shoreline adjacent to urban runoff outlets that flow intermittently, and shoreline adjacent to outlets that flow year-round. Each site was sampled for total coliforms, fecal coliforms …