Document type: DU ETD
Collection: Geology Theses  
Title Anomalous Water Balances and Mid-Tropospheric Circulation in the Contiguous United States From 1946 to 1994
Author(s) Wedgeworth, Connie S.
School/Department Department of Geography
Institution University of Denver
Degree Type Master's
Degree Name M.A.
Type of Resource text
Degree Date 2001 November
Digital Origin reformatted digital
Rights Statement All Rights Reserved
Reason for Restrictions No restrictions
Type of Restriction No restrictions
Keyword(s) Geography
Genre Dissertations, Academic
Abstract The purpose of this study was to identify abnormally dry and wet events and describe their associated 500-millibar circulation patterns. The abnormally dry and wet events were defined using the Palmer Drought Severity Index (PDSI). Most events had qualifying PDSI divisions that occurred west ofthe - Mississippi River. The anomalously wet and dry episodes mainly occurred in summer and fall and lasted from four to 19 months. The associated 500-millibar patterns frequently indicated dry air mass flow into an area for dry events. During wet events, the 500-millibar patterns sometimes indicated enhanced moisture flow into the areas experiencing wet events. The position of the positive height anomaly or negative height anomaly was important in influencing the surface conditions. The position of these positive height anomalies and negative height anomalies can enhance or suppress moisture advection and heat advection into the continent. Moisture and heat (evapotranspiration) are the two main influences of the watebalance of an area. Wet events were more difficult to associate with 500-millibar patterns since they events are not always synoptic in nature, especially during summer when convection plays a large role in precipitation throughout the contiguous United States.
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du_mas_2001_Wedgeworth.pdf   du_mas_2001_Wedgeworth.pdf application/pdf 131.41MB 0

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