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Title page for ETD etd-07202018-145231


Type of Document Master's Thesis
Author Ronay, Elli Rose
Author's Email Address elli.ronay@vanderbilt.edu
URN etd-07202018-145231
Title Trace elements as proxies for seasonality in a modern speleothem from northeast India
Degree Master of Science
Department Earth and Environmental Sciences
Advisory Committee
Advisor Name Title
Jessica Oster Committee Chair
Steve Goodbred Committee Member
Keywords
  • proxy calibration
  • Indian Summer Monsoon
  • Speleothems
Date of Defense 2018-08-31
Availability restricted
Abstract
In monsoonal regions, speleothem proxy records focus on the wet season and are typically interpreted as records of “monsoon strength.” More often than not, the question about the relative importance of changes of rainfall amount versus seasonality and/or moisture source remains unclear. Here we combine a sub-seasonally resolved speleothem trace element record from Mawmluh Cave in NE India with I-STAL forward modeling experiments to show that dry season effective infiltration is the main driver of proxy variability in this Indian Summer Monsoon dominated region. Winter temperature driven ventilation of Mawmluh Cave further biases proxy records towards the dry season through enhanced CO2 degassing and increased stalagmite growth rates. During the 1976-1998 warm phase of the Pacific Decadal Oscillation, winter rainfall above Mawmluh Cave increased, which is reflected in higher δ18O values and reduced seasonal amplitudes in trace elements.
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