Extensive green roofs provide many ecosystem services lacking in the urban environment and are a widely implemented green infrastructure solution for urban stormwater. Yet few studies consider the performance of large green roofs after installation. This study presents initial data covering a few days in fall 2013 collected at a large exterior green roof (0.56 ha) in Syracuse, NY. Temperature sensors were installed throughout the layers of the roof during construction. Daily temperature follows an approximate sine curve with amplitude decreasing as a function of depth into the roof. Analysis of temperature within the roof layers indicates lag times of 3-4 hours relative to air temperature, illustrating slow heat transfer through the layers. Initial observations of growth medium moisture conditions show changing thermal properties as moisture content changes. Future work will consider heat transfer in all seasons and the influence of building HVAC system data on the roof temperature profile.
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