A Case Study Diagnosis of the Formation of an Upper-Level Cutoff Cyclonic Circulation over the Eastern United States

1993 ◽  
Vol 121 (6) ◽  
pp. 1635-1655 ◽  
Author(s):  
Gerald D. Bell ◽  
Lance F. Bosart
Keyword(s):  
United States ◽  
Cyclonic Circulation ◽  
Eastern United States ◽  
Upper Level

Can Clearcutting Reset Successional Trajectories in Upland Oak–Hickory Forests? A Case Study from Mid-Missouri

2019 ◽  
Vol 117 (5) ◽  
pp. 435-442
Author(s):  
Benjamin O Knapp ◽  
Samantha E Anderson ◽  
Patrick J Curtin ◽  
Casey Ghilardi ◽  
Robert G Rives
Keyword(s):  
United States ◽  
Tree Species ◽  
Eastern United States ◽  
Oak Regeneration ◽  
Species Dominance ◽  
Relative Contribution ◽  
Successional Trajectory ◽  
Species Groups ◽  
Management Challenge

Abstract Securing oak regeneration is a common management challenge in the central and eastern United States. We quantified the abundance of tree species groups in clearcuts in mid-Missouri more than 30 years following harvest to determine differences in species dominance based on aspect (exposed, protected, or ridge sites). Each tree was classified as “dominant” or “suppressed” based on its relative contribution to cumulative stand stocking, following concepts of the tree–area relation. Although maples or understory species were the most abundant across all sites, oaks and hickories contributed to more than 60 percent of the dominant stems on the exposed sites. In contrast, oaks and hickories made up less than 25 percent of the dominant stems on protected and ridge sites. Results indicate that clearcutting reset the successional trajectory, from a transition to maple dominance to maintaining oak–hickory dominance, on exposed sites but not on ridge or protected sites.

scholarly journals Understanding Heritage Language Learners’ Critical Language Awareness (CLA) in Mixed Language Programs

Languages ◽  
2021 ◽  
Vol 6 (1) ◽  
pp. 37
Author(s):  
Laura Gasca Jiménez ◽  
Sergio Adrada-Rafael
Keyword(s):  
United States ◽  
Heritage Language ◽  
Language Ideologies ◽  
The United States ◽  
Language Awareness ◽  
Eastern United States ◽  
Language Programs ◽  
Mixed Language ◽  
Critical Language Awareness ◽  
Upper Level

Despite the prevalence of mixed language programs across the United States, their impact on the unique socio-affective needs of heritage language (HL) students has not been researched sufficiently. Therefore, the present study examines HL learners’ critical language awareness (CLA) in a mixed Spanish undergraduate program at a small private university in the eastern United States. Sixteen HL learners enrolled in different Spanish upper-level courses participated in the study. Respondents completed an existing questionnaire to measure CLA, which includes 19 Likert-type items addressing different areas, such as language variation, language ideologies, bilingualism, and language maintenance. Overall, the results show that learners in the mixed language program under study have “somewhat high” and “high” levels of CLA. The increased levels of CLA in learners who had completed three courses or more in the program, coupled with their strong motivation, suggests that this program contributes positively toward HL students’ CLA. However, respondents’ answers also reveal standard language ideologies, as well as the personal avoidance of code-switching. Based on these findings, two areas that could benefit from a wider representation in the curriculum of mixed language programs are discussed: language ideologies and plurilingual language practices.

Landsat Orbital Repeat Frequency and Cloud Contamination: A Case Study for Eastern United States

2019 ◽  
Vol 85 (2) ◽  
pp. 109-118 ◽  
Author(s):  
Samuel N. Goward ◽  
Tatiana V. Loboda ◽  
Darrel L. Williams ◽  
Chengquan Huang
Keyword(s):  
United States ◽  
Eastern United States

scholarly journals The experience of guestworkers at a United States tourist resort

2013 ◽  
Vol 10 (2) ◽  
pp. 198-228
Author(s):  
Guilherme Mansur Dias
Keyword(s):  
United States ◽  
The United States ◽  
Temporary Employment ◽  
Eastern United States ◽  
Labour Relations ◽  
The North ◽  
North Eastern ◽  
The Us ◽  
Ethnographic Analysis

This article examines temporary employment among foreign workers at the Okemo Mountain Resort, a tourist ski complex located in Vermont state in the north-eastern United States. I discuss the meanings associated with the international displacement of these workers, focusing especially on the ideas and imagery surrounding 'mobility', 'work,' 'travel' and 'youth.' By describing their experiences, along with the practices and discourses of the employer and the US State, the case study shows how Okemo's strategy of hiring a flexible foreign workforce is connected to the multiple meanings through which these groups represent their experience of temporary migration to the United States in the context of increasingly precarious labour relations. The ethnographic analysis proposed by the research provides a counterpoint to the 'macro-analytical' approach employed by most studies on the issue of foreign temporary work in the United States.

scholarly journals Linkages between Extreme Precipitation Events in the Central and Eastern United States and Rossby Wave Breaking

2019 ◽  
Vol 147 (9) ◽  
pp. 3327-3349 ◽  
Author(s):  
Benjamin J. Moore ◽  
Daniel Keyser ◽  
Lance F. Bosart
Keyword(s):  
United States ◽  
Rossby Wave ◽  
Wave Breaking ◽  
Wave Pattern ◽  
Eastern United States ◽  
Synoptic Scale ◽  
Rossby Wave Breaking ◽  
Extreme Precipitation Events ◽  
Upper Level ◽  
Precipitation Events

AbstractLinkages between extreme precipitation events (EPEs) in the central and eastern United States and synoptic-scale Rossby wave breaking are investigated using 1979–2015 climatologies of EPEs and upper-level potential vorticity (PV) streamers. The investigation focuses on two domains over the central and eastern United States, respectively, and emphasizes widespread EPEs, events exhibiting exceptionally large precipitation volumes. The relative frequency of PV streamers is found to be significantly enhanced relative to climatology immediately upstream of each domain during widespread EPEs. Majorities of the widespread EPEs in the central (~79%) and eastern (~56%) U.S. domains co-occur with a PV streamer positioned immediately upstream. Odds ratios of EPEs for days when a PV streamer occurs upstream of each domain indicate a strong, statistically significant association between EPEs and Rossby wave breaking. The strength of the EPE–Rossby wave breaking linkage, as measured by co-occurrence fractions and odds ratios, tends to increase with increasing EPE precipitation volume, such that the strongest linkage exists for widespread EPEs. Composite analyses reveal that Rossby wave breaking can result in widespread EPEs by establishing a persistent high-amplitude synoptic-scale wave pattern, within which strong poleward water vapor transport and ascent are forced over the EPE region immediately downstream of an elongated upper-level trough. Additional analyses demonstrate that, compared to corresponding null cases, Rossby wave breaking cases resulting in widespread EPEs exhibit a significantly higher-amplitude wave pattern that favors greater poleward transport of moist, conditionally unstable air and stronger ascent over the EPE region.

Sign in / Sign up

Export Citation Format

Share Document