Jiaying Wu
Geography-Geology Building Room 147

This dissertation develops novel high-resolution paleoclimate and paleoenvironmental reconstructions for Chirripó National Park of Costa Rica in Central America, using sub-fossil chironomid remains, microscopic charcoal and the geochemical signals extracted from sediment cores recovered from glacial lakes located in the park. Comparison is also made between the late Holocene hydroclimate and paleoenvironmental conditions at mid- and high-elevation sites in Costa Rica and the surrounding regions, to facilitate an assessment of the relationship between possible driver(s) of hydroclimate variability and paleoenvironmental change in this region during medieval times. Lastly, highly resolved charcoal and geochemical data is analyzed to identify how fire events have influenced nutrient flux and vegetation recovery within the Chirripó páramo during the late Holocene.