Effects of Orography and the African Easterly Waves on the Genesis of Hurricane Javier (2004) in the Eastern Pacific Ocean


Book Description

Performs nested numerical experiments using the Advanced Research Weather Forecast and Research (WRF-ARW) model to investigate the effects of orography and the African easterly waves (AEW) on the genesis of tropical cyclones in the Eastern Pacific Ocean. Tests the hypothesis that the formation of hurricanes is due to the merging of the orographically modified AEW by Central American mountains, mesoscale convective systems embedded within the AEWs, and the mesoscale convective systems induced by diurnal heating over the mountains. Studies the effects of orography by performing sensitivity experiments using WRF to simulate tropical cyclogenesis of Hurricane Javier (2004) over the Eastern Pacific Ocean.




The Maintenance and Propagation of African Easterly Waves Across Northern Africa: A Case Study and Analysis of the Environment


Book Description

This research focuses on the formation and maintenance of an African Easterly Wave (AEW) that developed over Northern Africa in 2000. Specifically, the pre-development period of Hurricane Alberto that initially formed over the Ethiopian Highlands (EH) region is studied in conjunction with this AEW disturbance. Based on EUMETSAT infrared (IR) satellite imagery and ECMWF 0.5o observational model (EOM) analysis data, we identified four convective genesis periods (G-I, G-II, G-III, and G-IV) and three lysis periods (L-I, L-II, and L-III). Based on the EOM analysis of the pre-Alberto system, we found that moisture and vertical velocity played a major role in the generation and maintenance of the convective cycles associated with the pre-Alberto system as it traveled westward across Northern Africa. Initially, orographic effects induce vertical velocity and moisture, and as the Alberto system travels westward these parameters are governed more by environmental factors. The National Center for Atmospheric Research (NCAR) Regional Climate Model Version 3.0 (henceforth RegCM3) was used to run the control case and several sensitivity simulations. We found that the EH is important for focusing and organizing AEW features by producing a consistent stationary wave mode, generating lee side vorticity, and initially providing sufficient vertical moisture flux for convection. PBL effects over the EH cause the initial convection in response to diurnal diabetic heating. As this convection propagates downstream, it merges with the orographically generated MV on the lee of the EH and a MCC results. PBL effects and moisture availability are important for propagating and maintaining AEW disturbances as they travel to the west and supporting sufficient moisture by allowing for surface moisture fluxes to affect these systems and aid in convective development. The AEW is slightly modulated by orography downstream from the EH region. Both the EH region and the PBL effects are essential in th.










The Ocean and Cryosphere in a Changing Climate


Book Description

The Intergovernmental Panel on Climate Change (IPCC) is the leading international body for assessing the science related to climate change. It provides policymakers with regular assessments of the scientific basis of human-induced climate change, its impacts and future risks, and options for adaptation and mitigation. This IPCC Special Report on the Ocean and Cryosphere in a Changing Climate is the most comprehensive and up-to-date assessment of the observed and projected changes to the ocean and cryosphere and their associated impacts and risks, with a focus on resilience, risk management response options, and adaptation measures, considering both their potential and limitations. It brings together knowledge on physical and biogeochemical changes, the interplay with ecosystem changes, and the implications for human communities. It serves policymakers, decision makers, stakeholders, and all interested parties with unbiased, up-to-date, policy-relevant information. This title is also available as Open Access on Cambridge Core.




Reducing Poverty, Protecting Livelihoods, and Building Assets in a Changing Climate


Book Description

Climate change is the defining development challenge of our time. More than a global environmental issue, climate change and variability threaten to reverse recent progress in poverty reduction and economic growth. Both now and over the long run, climate change and variability threatens human and social development by restricting the fulfillment of human potential and by disempowering people and communities in reducing their livelihoods options. Communities across Latin America and the Caribbean are already experiencing adverse consequences from climate change and variability. Precipitation has increased in the southeastern part of South America, and now often comes in the form of sudden deluges, leading to flooding and soil erosion that endanger people s lives and livelihoods. Southwestern parts of South America and western Central America are seeing a decrease in precipitation and an increase in droughts. Increasing heat and drought in Northeast Brazil threaten the livelihoods of already-marginal smallholders, and may turn parts of the eastern Amazon rainforest into savannah. The Andean inter-tropical glaciers are shrinking and expected to disappear altogether within the next 20-40 years, with significant consequences for water availability. These environmental changes will impact local livelihoods in unprecedented ways. Poverty, inequality, water access, health, and migration are and will be measurably affected by climate change. Using an innovative research methodology, this study finds quantitative evidence of large variations in impacts across regions. Many already poor regions are becoming poorer; traditional livelihoods are being challenged in unprecedented ways; water scarcity is increasing, particularly in poor arid areas; human health is deteriorating; and climate-induced migration is already taking place and may increase. Successfully reducing social vulnerability to climate change and variability requires action and commitment at multiple levels. This volume offers key operational recommendations at the government, community, and household levels with particular emphasis placed on enhancing good governance and technical capacity in the public sector, building social capital in local communities, and protecting the asset base of poor households.




Storms, Violent Winds, and Earth's Atmosphere


Book Description

Presents an introduction to storms, discussing the role of the Earth's atmosphere in the formation of storms and describing the different types of storms, including windstorms, thunderstorms, tornadoes, and tropical cyclones.




Natural Hazards, UnNatural Disasters


Book Description

This book examines how to ensure that the preventive measures are worthwhile and effective, and how people can make decisions individually and collectively at different levels of government.




Coastal Engineering 2006


Book Description

This Proceedings contains 445 papers presented at the 30th International Conference on Coastal Engineering, which was held in San Diego, California, USA, 3-8 September 2006. The Proceedings is divided into five parts: Waves; Swash, Nearshore Currents, and Long Waves; Coastal Management, Risk, and Ecosystem Restoration; Sediment Transport and Morphology; and Coastal Structures. The individual papers cover a broad range of topics including theory, numerical and physical modeling, field measurements, case studies, design, and management. These papers provide engineers, scientists, and planners state-of-the-art information on coastal engineering and coastal processes.