Factors contributory to fire occurrences in two populated areas in the American southwest

PurposeThis study aims to further understand the factors contributory to fire occurrences in two semi-arid regions in the American Southwest, Clark County in Nevada and Maricopa and Pinal Counties in Arizona.Design/methodology/approachStatistical and geographic information system analyses were employed to examine the spatial and temporal relationships of various natural and human-caused factors with fire incidences.FindingsAngström fire danger index, average amount of rainfall one month prior, extent of forests and grasslands, and proximities to secondary roads and population centers have significant relationships with fire events.Research limitations/implicationsThe importance of the factors contributory to fire occurrence is site-specific even in areas with similar climatic regimes and varies among different geographic regions; as such, researchers will need to conduct specific investigation of each study area.Practical implicationsThe findings of this study can be instrumental in facilitating fire managers to derive more informed strategies in fire prevention and management.Originality/valueWhile there are many studies on fire, most of them are conducted in wet regions with a lot of vegetative cover; not much work is done on arid areas. This paper considered and compared the spatial and temporal relationships of a wide range of natural and human-caused factors with fire events in two semi-arid areas. The intent was to assess the relative importance of these factors in areas even with similar climatic regimes. As our world is facing unprecedented changes in terms of climate and population growth, it is paramount to have an enhanced understanding of the impacts of these changes on fire regimes. The study areas are hot and dry, and they are located in the wildland–urban interfaces with rapid population growth and urbanization; as such, the research findings may contribute to existing literature.

Rapid increases in shrubland and forest intrinsic water-use efficiency during an ongoing megadrought

Globally, intrinsic water-use efficiency (iWUE) has risen dramatically over the past century in concert with increases in atmospheric CO2 concentration. This increase could be further accelerated by long-term drought events, such as the ongoing multidecadal “megadrought” in the American Southwest. However, direct measurements of iWUE in this region are rare and largely constrained to trees, which may bias estimates of iWUE trends toward more mesic, high elevation areas and neglect the responses of other key plant functional types such as shrubs that are dominant across much of the region. Here, we found evidence that iWUE is increasing in the Southwest at one of the fastest rates documented due to the recent drying trend. These increases were particularly large across three common shrub species, which had a greater iWUE sensitivity to aridity than Pinus ponderosa, a common tree species in the western United States. The sensitivity of both shrub and tree iWUE to variability in atmospheric aridity exceeded their sensitivity to increasing atmospheric [CO2]. The shift to more water-efficient vegetation would be, all else being equal, a net positive for plant health. However, ongoing trends toward lower plant density, diminished growth, and increasing vegetation mortality across the Southwest indicate that this increase in iWUE is unlikely to offset the negative impacts of aridification.

Existential Definition at the End of the American Road

This article discusses three films that helped landmark American cinema in the 1970s. Although differing in inception and reception, all three belong loosely to the genre of the road movie and are linked by protagonists whose stances of rebellion and alienation were characteristic of the counterculture of the 1970s and by the broader theme of existential self-definition that still influences moviemaking today. A critical and commercial failure on its release in 1970, Michelangelo Antonioni’s Zabriskie Point has been revalorized as an ambitious attempt to represent the political and cultural conflicts that seemed to be fracturing American society at the time. In contrast, Richard Sarafian’s Vanishing Point soon overcame the disadvantage of studio disinterest and established itself as a cult favorite. Arguably the definitive anti-hero of 1970s cinema, the amphetamine-fueled renegade driver played by Barry Newman achieves iconic stature through an act of defiant self-destruction that still leaves viewers of the film stunned. Finally, Clint Eastwood’s The Gauntlet, in which the actor-director breaks with his ‘Dirty Harry’ persona to depict a burned-out cop who redeems a ruined career, and enables himself a new start, not by making his own law but by enforcing the law on the books, and against all odds. In all three films, the still unspoiled landscape of the American Southwest, crisscrossed by its skein of highways, provides the tableau for escapist fantasies that may in fact be real, for high-speed chases and automotive acrobatics that defy the laws of physics, and for vignettes of an ‘outsider’ way of life that was already beginning to perish.

CHALLENGING THE WESTERN IN CORMAC MCCARTHY'S BLOOD MERIDIAN

Set in the nineteenth-century American Southwest, Cormac McCarthy’s Blood Meridian rewrites the conventions of the western genre through a historically informed fictionalized account of the Glanton gang. As part of McCarthy’s subversive literary oeuvre, the novel intends to deromanticize the western’s underlying myths and dismantle its binaries, as well as to expose the brutality of the frontier and reflect on violence as a historiographic condition. Within studies of the western, McCarthy’s work, and transgressive literature, this article wishes to contribute to the existing discussions of McCarthy’s writing by examining Blood Meridian as a critical postmodern western or anti-western, and analyzing its strategies of demythologizing the West and the western.

D. H. Lawrence’s Travel Writing: Concept of Nudity and Sexuality with a Difference

In that he spent most of his life outside Britain, D. H. Lawrence often seems the least British of the British Modernists. His interest in and willingness to be influenced by Italy, Sicily, the American Southwest, Mexico and Australia can be easily explored in his travel books. Whereas his novels are too didactic in nature, his philosophies get naturally matured as he travels and they are expressed very succinctly in his travel writing. In various parts of his four travel books, namely Twilight in Italy (1916), Sea and Sardinia (1921), Morning in Mexico (1927), Sketches of Etruscan Places (1932) Lawrence depicts the difference between nudity and nakedness and how they influence him. The other contrast here is between art and life, with the nude standing for art and nakedness for life with the section on Florence and the art there. The essay focuses on how Lawrence views art differently when actually experiencing these works himself during his travels. I show different phases in his response to nudity/nakedness as shown in his four travel books and what accounts for these changes. The thesis is the examination of Lawrence’s belief that the touch of amateurism and primitivism can inject new freshness into our lives and can salvage them from the clutches of habit, and the mechanized civilisation. Nudity and sexuality as part of primitive modes of life can balance and heal what Freud termed the discontents of civilisation. Situated on the thin line between nudity and sexuality, D.H. Lawrence’s travel writing recounts man’s true relationship with the cosmos. And finally, the paper shows some misunderstanding on the part of the second wave feminists on his representation of masculinity in nakedness.

Improved dryland carbon flux predictions with explicit consideration of water-carbon coupling

Dryland ecosystems are dominant influences on both the trend and interannual variability of the terrestrial carbon sink. Despite their importance, dryland carbon dynamics are not well-characterized by current models. Here, we present DryFlux, an upscaled product built on a dense network of eddy covariance sites in the North American Southwest. To estimate dryland gross primary productivity, we fuse in situ fluxes with remote sensing and meteorological observations using machine learning. DryFlux explicitly accounts for intra-annual variation in water availability, and accurately predicts interannual and seasonal variability in carbon uptake. Applying DryFlux globally indicates existing products may underestimate impacts of large-scale climate patterns on the interannual variability of dryland carbon uptake. We anticipate DryFlux will be an improved benchmark for earth system models in drylands, and prompt a more sensitive accounting of water limitation on the carbon cycle.

Hantavirus outbreaks in the American Southwest: Propagation and retraction of rodent and virus diffusion waves from sky-island refugia

Hantavirus outbreaks in the American Southwest are hypothesized to be driven by episodic seasonal events of high precipitation, promoting rapid increases in virus-reservoir rodent species that then move across the landscape from high quality montane forested habitats (refugia), eventually over-running human residences and increasing disease risk. In this study, the velocities of rodents and virus diffusion wave propagation and retraction were documented and quantified in the sky-islands of northern New Mexico and related to rodent-virus relationships in refugia versus nonrefugia habitats. Deer mouse (Peromyscus maniculatus) refugia populations exhibited higher Sin Nombre Virus (SNV) infection prevalence than nonrefugia populations. The velocity of propagating diffusion waves of Peromyscus from montane to lower grassland habitats was measured at [Formula: see text] m/day (SE), with wave retraction velocities of [Formula: see text] m/day. SNV infection diffusion wave propagation velocity within a deer mouse population averaged [Formula: see text] m/day, with a faster retraction wave velocity of [Formula: see text] m/day. A spatio-temporal analysis of human Hantavirus Pulmonary Syndrome (HPS) cases during the initial 1993 epidemic revealed a positive linear relationship between the time during the epidemic and the distance of human cases from the nearest deer mouse refugium, with a landscape diffusion wave velocity of [Formula: see text] m/day ([Formula: see text]). These consistent diffusion propagation wave velocity results support the traveling wave component of the HPS outbreak theory and can provide information on space–time constraints for future outbreak forecasts.