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Foragers and Farmers of the Northern Kayenta Region
Foragers and Farmers of the Northern Kayenta Region presents the results of a major archaeological excavation project on Navajo tribal land in the Four Corners area and integrates this new information with existing knowledge of the archaeology of the northern Kayenta region. The excavation of thirty-three sites provides a cross section of prehistory from which Navajo Nation archaeologists retrieved a wealth of information about subsistence, settlement, architecture, and other aspects of past lifeways. The project’s most important contributions involve the Basketmaker and Archaic periods, and include a large number of radiocarbon dates on high-quality samples. Dating back to the early Archaic period (ca. 7000 BC) and ranging forward through the Basketmaker components to the Puebloan period, this volume is a powerful record of ancient peoples and their cultures. Detailed supplementary data will be available on the University of Utah Press Web site upon publication of this summary volume.
eBook
To the edges of the Earth : 1909, the race for the three poles, and the climax of the age of exploration
\"[A] narrative of the most adventurous year of all time, when three expeditions simultaneously raced to the top, bottom, and heights of the world\"-- Provided by publisher.
Book
Himalayan perceptions
In the 1970s and 1980s many institutions, agencies and scholars believed that the Himalayan region was facing severe environmental disaster, due primarily to rapid growth in population that has caused extensive deforestation, which in turn has led to massive landsliding and soil erosion. This series of assumptions was first challenged in the book: The Himalayan Dilemma (1989: Ives and Messerli, Routledge). Nevertheless, the environmental crisis paradigm still commands considerable support, including logging bans in the mountain watersheds of China, India, and Thailand, and is constantly being promoted by the news media. Himalayan Perceptions identifies the confusion of misunderstanding, vested interests, changing perceptions, and institutional unwillingness to base development policy on sound scientific knowledge. It analyzes the large amount of new research published since 1989 and totally refutes the entire construct. It examines recent social and economic developments in the region and identifies warfare, guerrilla activities, and widespread oppression of poor ethnic minorities as the primary cause for the instability that pervades the entire region. It is argued that the development controversy is further confounded by exaggerated reporting, even falsification, by news media, environmental publications, and agency reports alike.
Jack D. Ives is Senior Advisor on Sustainable Mountain Development at The United Nations University, Tokyo.
1. The Myth of Himalayan Environmental Degradation 2. The Himalayan Region: An Overview 3. Status of the Mountain Forests 4. Geomorphology of Agricultural Landscapes 5. Flooding in Bangladesh: Causes and Perceptions of Causes 6. Mountain Hazards 7. Development of Tourism and its Impacts 8. Conflict, Tension, and the Oppression of Mountain Peoples 9. Prospects for Future Development: Assets and Obstacles 10. What are the facts? Misleading Perceptions, Misconceptions, and Distortions 11. Conclusions: Redefining the Dilemma; is there a way out?
eBook
Elevation-dependent warming in global climate model simulations at high spatial resolution
The enhancement of warming rates with elevation, so-called elevation-dependent warming (EDW), is one of the regional, still not completely understood, expressions of global warming. Sentinels of climate and environmental changes, mountains have experienced more rapid and intense warming trends in the recent decades, leading to serious impacts on mountain ecosystems and downstream. In this paper we use a state-of-the-art Global Climate Model (EC-Earth) to investigate the impact of model spatial resolution on the representation of this phenomenon and to highlight possible differences in EDW and its causes in different mountain regions of the Northern Hemisphere. To this end we use EC-Earth climate simulations at five different spatial resolutions, from \\[\\sim\\] 125 to \\[\\sim\\] 16 km, to explore the existence and the driving mechanisms of EDW in the Colorado Rocky Mountains, the Greater Alpine Region and the Tibetan Plateau–Himalayas. Our results show that the more frequent EDW drivers in all regions and seasons are the changes in albedo and in downward thermal radiation and this is reflected in both daytime and nighttime warming. In the Tibetan Plateau-Himalayas and in the Greater Alpine Region, an additional driver is the change in specific humidity. We also find that, while generally the model shows no clear resolution dependence in its ability to simulate the existence of EDW in the different regions, specific EDW characteristics such as its intensity and the relative role of different driving mechanisms may be different in simulations performed at different spatial resolutions. Moreover, we find that the role of internal climate variability can be significant in modulating the EDW signal, as suggested by the spread found in the multi-member ensemble of the EC-Earth experiments which we use.
Journal Article
Climate change in mountains: a review of elevation-dependent warming and its possible causes
Available observations suggest that some mountain regions are experiencing seasonal warming rates that are greater than the global land average. There is also evidence from observational and modeling studies for an elevation-dependent climate response within some mountain regions. Our understanding of climate change in mountains, however, remains challenging owing to inadequacies in observations and models. In fact, it is still uncertain whether mountainous regions generally are warming at a different rate than the rest of the global land surface, or whether elevation-based sensitivities in warming rates are prevalent within mountains. We review studies of four high mountain regions – the Swiss Alps, the Colorado Rocky Mountains, the Tibetan Plateau/Himalayas, and the Tropical Andes – to examine questions related to the sensitivity of climate change to surface elevation. We explore processes that could lead to enhanced warming within mountain regions and possible mechanisms that can produce altitudinal gradients in warming rates on different time scales. A conclusive understanding of these responses will continue to elude us in the absence of a more comprehensive network of climate monitoring in mountains.
Journal Article
Burn me twice, shame on who? Interactions between successive forest fires across a temperate mountain region
Increasing rates of natural disturbances under a warming climate raise important questions about how multiple disturbances interact. Escalating wildfire activity in recent decades has resulted in some forests re-burning in short succession, but how the severity of one wildfire affects that of a subsequent wildfire is not fully understood. We used a field-validated, satellite-derived, burn-severity atlas to assess interactions between successive wildfires across the US Northern Rocky Mountains a 300,000-km² region dominated by fire-prone forests. In areas that experienced two wildfires between 1984 and 2010, we asked: (1) How do overall frequency distributions of burn-severity classes compare between first and second fires? (2) In a given location, how does burn severity of the second fire relate to that of the first? (3) Do interactions between successive fires vary by forest zone or the interval between fires? (4) What factors increase the probability of burning twice as standreplacing fire? Within the study area, 138,061 ha burned twice between 1984 and 2010. Overall, frequency distributions of burn severity classes (low, moderate, high; quantified using relativized remote sensing indices) were similar between the first and second fires; however burn severity was 5-13% lower in second fires on average. Negative interactions between fires were most pronounced in lower-elevation forests and woodlands, when fire intervals were < 10 yr, and when burn severity was low in the first fire. When the first fire burned as high severity and fire intervals exceeded 10-12 yr, burn-severity interactions switched from negative to positive, with high-severity fire begetting subsequent high-severity fire. Locations most likely to experience successive stand-replacing fires were high-elevation forests, which are adapted to high-severity fire, and areas conducive to abundant post-fire tree regeneration. Broadly similar severities among short-interval \"re-burns\" and other wildfires indicate that positive severity feedbacks, an oft-posited agent of ecosystem decline or state shift, are not an inevitable outcome of re-burning. Nonetheless, context-dependent shifts in both the magnitude and direction of wildfire interactions (associated with forest zone, initial burnseverity, and disturbance interval) illustrate complexities in disturbance interactions and can inform management and predictions of future system dynamics.
Journal Article
The evolution of “riskscapes”: 100 years of climate change and mountaineering activity in the Lake Louise area of the Canadian Rockies
Climate change is contributing to the rapid warming of mountain environments, resulting in glacial retreat, diminished snowpacks, and permafrost thaw. Such rapid changes have transformed the riskscape of mountaineering routes, altering climbing conditions and increasing objective hazards. In response, this study used a mixed methods approach that combines statistical climatological analysis with archival content analysis and semi-structured interviews with mountain guides to explore the relationship between climate change, route conditions, hazards, and adaptations in the Abbot Pass area of Banff National Park (Canada). Results revealed that long-term climatic shifts contributed to change in climbing conditions and objective hazards across all routes, creating a typology of climate-driven route evolution based on the original route characteristics. Mountaineers adapted to such change by employing spatial/activity and temporal substitutions to mitigate risks and exploit emergent opportunities. However, the use of such strategies was influenced by demographic (i.e., age, years of experience) and socio-cultural factors (i.e., place attachment, risk tolerance) and limited by hard limits to adaptation. Given the projected trajectory of climate change, our findings highlight the potential inevitability of mountaineers encountering such limits, resulting in forced transformations and significant loss and damages. Therefore, it is imperative to examine both the economic and non-economic consequences of these shifts and evaluate the ability of mountaineers and tourism providers to navigate a significantly transformed climate future in mountainous areas. While focused on a Canadian context, the findings and methodologies developed herein are relevant to other mountain geographies, where climate change is rapidly transforming environments frequented by mountaineers and represents a call to action for more research in field of climate change, adaptation, and mountaineering.
Journal Article
Linking long-term landscape dynamics to the multiple interactions among ecosystem services in the European Alps
Context
Human driven land-use and land-cover change (LULC) is considered to be among the greatest ecological pressures in mountain regions. Over the past century, across the European Alps, extensive LULC changes have been observed, affecting ecosystem goods and services (ESs).
Objectives
For eight case study sites across the Alpine arc we aimed to provide a spatiotemporal explicit assessment of the impacts of LULC dynamics on ES provision and interactions, including cultivated crops, plant material, climate regulation, soil erosion control and aesthetics.
Methods
We quantified ES provision in biophysical terms at four time periods (1850, 1955, 1985, 2005) using spatially explicit LULC based assessment models. ES interactions were identified by statistically analyzing the spatiotemporal pattern among ES capacities.
Results
Over the past century forested areas have increased mainly at the cost of grasslands, while on easily accessible sites and fertile valley floors agricultural intensification occurred. ES provision shifted between 1850 and 2005, from a predominance of production ESs in 1850 to a landscape characterized by regulating ESs in 2005. Spatiotemporal analyses of ES interactions revealed trade-offs between regulating and cultural ESs and within the provisioning ES bundle and allowed to derive three different ES trajectories: regions developing from single to multifunctional sites in terms of service provision, sites reducing their service capacities and sites with rather stationary patterns over broad time periods.
Conclusions
We demonstrated that ES capacities in complex agro-ecological mountain regions are highly sensitive to long-term landscape dynamics. We conclude that assessing ES capacities and interactions in an explicitly spatiotemporal manner can help to guide evidence-based environmental measures.
Journal Article
Mercury cycling in the U.S. Rocky Mountains: a review of past research and future priorities
Mercury cycles at levels three- to five-fold higher today than the pre-Industrial era, resulting in global contamination of ecosystems. In the western United States (U.S.), mercury mobilization has led to widespread production of methylmercury (MeHg), a potent, bioaccumulating neurotoxin, which has resulted in fish consumption advisories across all states. Mountain regions are particularly sensitive to continued mercury contamination as they receive higher rates of atmospheric deposition, compared to lower elevations, and have aquatic ecosystems on the landscape conducive to MeHg production. In this paper, we focus on the U.S. Rocky Mountain region and synthesize: (1) current knowledge regarding the mercury cycle; (2) impacts of climate change on the mercury cycle connected to hydrology and wildfire; and (3) future research priorities for informing mercury research and regulation. Studies on the interactions between mercury contamination and climate change in mountain ecosystems is still nascent. We use the findings from this synthesis to summarize the following research needs: (1) quantify sources of mercury in wet and dry deposition, as these pathways dictate mercury exposure and toxicity, and are shifting with climate change; (2) investigate MeHg in mountain aquatic ecosystems, which are important pathways of human mercury exposure and provide food resources and habitat to local wildlife; and (3) examine the disproportionate impact of mercury contamination on indigenous communities through community-led research. Although we focus on the Rocky Mountains for this review, the findings are applicable to semi-arid mountain ecosystems globally and must be prioritized to promote the health of ecosystems and people everywhere.
Journal Article