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Hydroclimate reconstruction during the last 1000 years inferred from the mineralogical and geochemical composition of a sediment core from Lake-Azuei (Haiti)
No full textThis study aims to reconstruct the hydro-climatic variations over the last 1000 years in Haiti using mineralogical and geochemical composition of well dated lacustrine sediment core retrieved from Lake Azuei. The results show changes in sedimentological processes linked to environmental and climatic variations. The general pattern suggests a wetter Medieval Climate Anomaly (MCA), drier Little Ice Age (LIA), high climate variability during the MCA-LIA transition and more anthropogenic impacts that dominate natural climate during the Current Warm Period (CWP). The MCA period (~1000–1100 CE) thus appears marked by increase sedimentation rate supported by higher terrigenous input linked to erosive events particularly increases in precipitation. During the LIA, particularly from ~1450 to 1600 CE, there is a great variation toward a decrease of terrigenous input, which is related to a decrease on sedimentation rate and increase Mg-calcite precipitation, suggesting less precipitation and high evaporation respectively during dry climate conditions. The MCA-LIA transition (~1200–1400 CE) is characterized by variations between terrigenous input, Mg-calcite formation and organic matter deposition, which indicate succession of dry and humid conditions. The CWP (1800–2000 CE) shows a progressive increase on sedimentation rate and decrease of gray level, which indicate more organic matter sedimentation as consequence of anthropogenic activities in the surrounding basin of the lake. High-resolution gray level analysis, which reflects principally variations in terrigenous input, carbonate mineral formation and organic matter deposition, shows that the AMO, NAO, PDO and ENSO are the principal modes affecting the hydro-climatic changes in Haiti during the last millennium. In addition, temporal correlation of other Caribbean paleoclimate records with our geochemical and mineralogical data, suggests that trends observed in Lake Azuei were controlled by regional climate, likely associated with shifts in the position of the ITCZ
Critically analyzing the meanings of “critical” media literacy
Get PDFThis study provides a critical analysis into how authors of publications about critical media literacy express what they mean by the term. The use of multiple strategies to examine the degree to which these authors exhibit a sharing of meaning led to the conclusion that there are far more differences than commonalities across definitions of critical media literacy. The implications of this conclusion raise important questions about the value of a literature where authors seem to express so many different meanings for the concept that they use to label their common concern
Marketing Doctrines, a Resurrection Guide: Review of The Art of Strategic Marketing War: Pearls of Wardom (2019) by Pete Jeans
Get PDFDelineating bedrock topography with geophysical techniques: An implication for groundwater mapping
No full textBedrock topography delineation is essential for shallow groundwater mapping because the bedrock surface is the lower boundary of the unconsolidated aquifer system and is difficult to map if covered by thick surficial deposits. Non-invasive geophysical techniques are suitable tools for quantifying the depth to bedrock at a single point location or the bedrock topography using an interpolation between multiple measurements, borings, outcrops, and knowledge of the local bedrock\u27s brittle and ductile structure. In this study, first, we developed a high-resolution bedrock topography map for the southern coast of Rhode Island, USA, with a wide range of available lithological data. Second, we employed the Horizontal to Vertical Spectral Ratio (HVSR) seismic method to develop a power-law regression between the resonance frequency and the depth to bedrock, and we demonstrated statistical techniques to refine the relationship. Like in most other formerly glaciated regions worldwide, the surficial deposits are glacial outwash and till. It was found that the predictive performance of HVSR was better for glacial outwash than till mixed outwash. In addition, we highlighted the importance of the HVSR technique in interpreting the electrical resistivity profiles for groundwater mapping in both inland and coastal aquifers. Though the quantitative results are site-specific, the approach and insights are generalizable to any unconfined aquifers
Parent Involvement in Early Childhood Education: Exploring Cultural Beliefs and Practices Through the Figured Worlds Approach to Support Learning Success for All Children
Get PDFThe authors of this article explore the impact of parent involvement in early childhood education in Korea. The work is grounded in the Figured Worlds Approach which states that people’s worldview is impacted by their culture, values, and communities. Context is provided for deeper understanding of cultural practices and values, language and communication, and strategies for understanding diverse groups. The author identified many implications for educators such as incorporating traditions, eliminating bias, and supporting learning through a growth mindset. Finally, the findings suggest future research could explore intersectionality, innovative family engagement, as well as policy changes and community partnerships
