Biogeochemistry of Tempe Town Lake

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Presentation transcript:

Biogeochemistry of Tempe Town Lake Lauren Puglisi

Introduction To Tempe Town Lake Map of Tempe Town Lake Manmade lake Built for flood control and recreational purposes Today, Tempe Town Lake is home to boating, fishing, biking, and more Tempe Town Lake is a good model for understanding larger reservoir systems, such as Lake Powell Tempe Town Lake http://www.kam-az.com/tempe%20town%20lake.jpg

Sampling Tempe Town Lake Objective: determine seasonal variations in the chemistry of Tempe Town Lake Method: sample Tempe Town Lake twice a week Test the samples for Dissolved Organic Carbons, pH, Dissolved Oxygen, Alkalinity, and Conductivity Filtration System Kelly and Hartnett

Dissolved Organic Carbon (DOC) Dissolved Organic Carbon Concentrations Seasonal variations have been observed DOC levels tend to “spike” during precipitation events

Conductivity Decreases with rain events Evaporation plays a role in conductivity levels

Dissolved Oxygen Varies seasonally Multiple factors appear to be involved

pH Tends to remain fairly constant

Alkalinity Appears to be strongly influenced by temperature Decreases when temperatures are cool, and increases when temperatures are warm

Recent Weather Events Increased Precipitation in January 2010 The increased rain fall and river flow necessitated the lowering of the inflatable dams Conductivity Concentrations Decreased Sampling was increased to investigate the effects of precipitation on the biogeochemistry of the lake.

Questions http://www.phoenix-valley-real-estate.com/images/Tempe%20Waterfront%20Condos%20007.jpg