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dc.contributor.authorWu, Jiaying
dc.date.accessioned2014-03-04T21:00:28Z
dc.date.available2014-03-04T21:00:28Z
dc.date.issued2012-12
dc.identifier.otherwu_jiaying_201212_ms
dc.identifier.urihttp://purl.galileo.usg.edu/uga_etd/wu_jiaying_201212_ms
dc.identifier.urihttp://hdl.handle.net/10724/28635
dc.description.abstractThe modern distribution of sub-fossil chironomids in Costa Rica is described making use of a fifty-four lake calibration set. The relationship between modern chironomid distribution and the measured limnological variables indicated that surface water temperature (SWT) accounts for a statistically significant amount of variance in the chironomid communities. A chironomid-based inference model for SWT, developed using weighted-averaging partial least squares, was applied to sub-fossil midge assemblages from Laguna Zoncho, Costa Rica, to reconstruct late Holocene thermal variability. The major findings of this study are: (1) SWT between1750 and 3100 cal yr BP was higher than the late Holocene average, (2) southern Costa Rica was characterized by below average temperatures during the Little Ice Age, and (3) Laguna Zoncho experienced very low lake levels, possibly reflecting drought, during the Medieval Climate Anomaly. This study pioneers the use of sub-fossil chironomid remains to develop quantitative estimates of Holocene thermal variability in Central America.
dc.languageeng
dc.publisheruga
dc.rightspublic
dc.subjectPaleoclimate
dc.subjectTemperature
dc.subjectChironomid
dc.subjectHolocence
dc.subjectCosta Rica
dc.subjectLittle Ice Age.
dc.titleA chironomid-based reconstruction of late Holocene climate change in southern Costa Rica
dc.typeThesis
dc.description.degreeMS
dc.description.departmentGeography
dc.description.majorGeography
dc.description.advisorDavid Porinchu
dc.description.committeeDavid Porinchu
dc.description.committeeThomas Mote
dc.description.committeeDavid Leigh
dc.description.committeeGeorge Brook


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