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Heat Island Mitigation Assessment and Policy Development for the Kansas City Region

  • Author(s): Gilbert, Haley
  • Jacobs, Tom
  • Jeong, Seongeun
  • Pomerantz, Melvin
  • Millstein, Dev
  • Norsby, Doug
  • Repinsky, Andrea
  • Levinson, Ronnen
  • et al.
Abstract

Lawrence Berkeley National Laboratory partnered with Mid-America Regional Council (MARC) to quantify the costs and benefits from the adoption of urban heat island (UHI) countermeasures in the Kansas City region (population 1.5 million), and identify the best regional implementation pathway for MARC. The team selected cool (high-albedo) roofs and increased vegetation as the two countermeasures to evaluate. For vegetation, there were two strategies: (1) planting new trees to shade building surfaces, and (2) increasing urban irrigation (a surrogate for the use of vegetation to manage stormwater) to increase evapotranspiration. Using the Weather Research and Forecasting (WRF) model we simulated selected weeks during summer time, across 5 years (2011 –2015) representing a range of normal summer conditions. We also simulated six of the most intense heatwaves that occurred between 2004 and 2016. We found under typical summer conditions (non-heatwave) average daytime (07:00 – 19:00 local standard time) regional near-ground air temperature reductions of 0.08 and 0.28 °C for cool roofs and urban irrigation,respectively. We calculated the building electricity, electricity cost, and emission savings that result from the reduction in outdoor air temperature (“indirect” savings) and found maximum regional annual indirect electricity savings of 42.8 GWh for cool roofs and 85.6 GWh for urban irrigation—yielding maximum regional annual indirect electricity cost savings of $5.6M and$11.1M, respectively, and maximum regional annual CO2 savings of 43.4 kt and 80 kt,respectively. We next evaluated the building energy, energy cost, and emission savings from reducing direct absorbed radiation on the building surfaces using cool roofs and shade trees(“direct” savings). For cool roofs, we found regional annual direct energy cost savings of $10.9M with regional annual CO2 savings of 66.4 kt. For shade trees, the regional annual direct energy cost savings were $21M with regional annual CO2 savings of 126 kt. We investigated cool roof cost premiums and shade tree first costs; cool roof cost premiums ranged from zero to $0.20/ft2,while shade trees were assumed to cost $100 per tree. When we compared the direct building annual cost savings to the cool-roof cost premiums and shade-tree first costs, we found regional simple payback times up to 8.0 years for cool roofs and 4.9 years for trees for energy cost savings to cover cost premiums and first costs, respectively. This comprehensive assessment of UHI countermeasures is a valuable methodology for other local governments to apply therefore, we developed a step-by-step guide for others to follow. Based on the costs and benefits of the UHI countermeasures, MARC will pursue the inclusion of these countermeasures in existing regional plans where they can complement other regional priorities for transportation, climate resiliency,clean air, and hazard mitigation. They hosted a local workshop in 2016 for stakeholders to introduce the topic and will continue to share these resources to further appropriate adoption of UHI countermeasures.

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