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dc.creatorQuesada Román, Adolfo
dc.creatorCampos, Néstor
dc.creatorAlcalá Reygosa, Jesús
dc.creatorGranados Bolaños, Sebastián
dc.date.accessioned2022-07-22T14:07:07Z
dc.date.available2022-07-22T14:07:07Z
dc.date.issued2020-06
dc.identifier.citationhttps://www.sciencedirect.com/science/article/pii/S0895981120300894?via%3Dihubes_ES
dc.identifier.urihttps://hdl.handle.net/10669/87015
dc.description.abstractSeveral high areas of Central America show evidence of past glacial activity, including glacial cirques, polished and striated bedrock surfaces and moraine deposits. As glacial remnants, these morphologies can guide the understanding of past climate conditions, such as during the Last Glacial Maximum (LGM). Based on aerial imagery (1:25,000), detailed Digital Elevation Model (DEM) and field geomorphic assessments, we establish paleo-equilibrium line altitudes using four methods: Median Glacier Elevation (MGE), Accumulation Area Ratio (AAR), Area x Altitude (AA), and Area-Altitude Balance Ratio (AABR) during the LGM for the Chirripó National Park in Costa Rica. In addition, we calculate the LGM paleo-temperature decrease multiplying several modern atmospheric lapse rates by the equilibrium line altitude depression. In addition, a Generalized Linear Model (GLM) was applied to describe linkages between obtained paleoglacier areas and multiple land surface parameters such as Basin location, Analytical Hillshading, Aspect, Area Surface Radiation, Diurnal Anisotropic Heating, Slope, Terrain Ruggedness Index, and Wind Exposition. Our results determined thirty-one paleo equilibrium line altitudes (paleo-ELAs) and a mean altitude of ~3490 m a.s.l. Some of the moraines used in this study have been recently dated, confirming the extension of the glaciers during LGM used to calculate the ELAs. We also obtained an annual average temperature decrease of ~10.5 °C applying a lapse rate of 0.65 °C/100. Moreover, Wind Exposition and Terrain Ruggedness Index were the land surface parameters with greater statistical correlation for paleo-glacier areas. Therefore, our results provide new knowledge into the reconstruction of the maximum expansion of the LGM on tropical landscapes.es_ES
dc.language.isoenges_ES
dc.sourceJournal of South American Earth Sciences; Vol. 100: 2020es_ES
dc.subjectPaleo-equilibrium line altitudees_ES
dc.subjectELA depressiones_ES
dc.subjectPaleotemperaturees_ES
dc.subjectLast glacial maximumes_ES
dc.subjectTropical mountainses_ES
dc.subjectCENTRAL AMERICAes_ES
dc.titleEquilibrium-line altitude and temperature reconstructions during the Last Glacial Maximum in Chirripó National Park, Costa Ricaes_ES
dc.typeartículo científicoes_ES
dc.identifier.doi10.1016/j.jsames.2020.102576
dc.description.procedenceUCR::Vicerrectoría de Docencia::Ciencias Sociales::Facultad de Ciencias Sociales::Escuela de Geografíaes_ES


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