"Hydroclimatic Variability in North-central Mongolia as Inferred from T" by Caroline Leland

Semester

Fall

Date of Graduation

2011

Document Type

Thesis

Degree Type

MA

College

Eberly College of Arts and Sciences

Department

Geology and Geography

Committee Chair

Amy Hessl

Committee Co-Chair

Branden McNeil

Committee Member

Neil Pederson

Abstract

The influence of increasing temperatures on hydrologic regimes across Mongolia is difficult to evaluate from a spatial perspective, particularly at fine resolutions. Therefore, networks of tree-ring chronologies are a valuable means of assessing regional and local variability in hydroclimate while placing recent moisture trends in a historical context. Tree-ring data are particularly useful in Mongolia, where instrumental records are spatially and temporally limited. Here, I present two chapters that are essentially related and complement one another. The first chapter seeks to identify tree-growth anomaly regions (i.e. inferred hydroclimatic regions) across north-central Mongolia based on a network of 21 tree-ring chronologies. I applied a rotated principal component analysis (RPCA) to the tree-ring network and identified four tree-growth anomaly regions, which display unique hydroclimatic variability through time. Chapter Two evaluates the tree-growth anomaly regions in terms of ranked drought and pluvial events. From a spatial perspective, these analyses demonstrate the extent of interregional and intraregional hydroclimatic variability across the network; in particular, the results highlight that the Eastern and Western regions of the network are especially unique from one another. Each chapter is presented in a journal article format and consists of its own abstract.

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