Feeling the Heat: Explore an Urban Heat Island

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  • This presentation was developed with funding from the Center for Multi-Scale Modeling of Atmospheric Processes (CMMAP) and the National Center for Atmospheric Research (NCAR). Copyright NESTAFeeling the Heat

  • Feeling the heatThis presentation is full of data and images to get you thinking! Discuss as a class the patterns you see and the reasons for those patterns.Looking for patterns Take a look at graph representations of the Los Angeles heat wave data and the average temperature data. How have they changed throguh time?Reasons for patternsCheck out how global climate has changed over time and compare that with the data from Los Angeles. Take a look at how Los Angeles has grown through time and how that has impacted the heat island effect.

  • This graph shows the number of heat waves in Los Angeles, CA over the past century. Do you see a pattern? How have heat waves changed through time?

    (Graph from Tamrazian et al., 2008)

    Looking for patterns

  • This graph shows the duration of heat waves in Los Angeles, CA (measured in days.) Has there been a change through time?

    (Graph from Tamrazian et al., 2008)

    Looking for patterns

  • Looking for patternsHow has the temperature in Los Angeles changed over time? This graph shows the average temperature for each year. See a pattern?

  • Warmer city temperatures are partially due to global warming. This graph shows how Earths average temperature has changed.Reasons for patterns

  • Reasons for patternsNotice above how the highest temperatures are found in the most dense part of a city?

    The 3 following slides show how LA has changed over time. How do you think the heat island effect has changed over time? What was the heat island effect like in 1877, 1909, and 2002?

  • Los Angeles, CA in 1877. East LA is on the left and West LA is on the right. (Courtesy of the Library of Congress)

    Reasons for patterns

  • Los Angeles, CA in 1909. (Courtesy of the Library of Congress)

    Reasons for patterns

  • Los Angeles, CA in 2002. This 3-D perspective view was generated using topographic data and an enhanced color Landsat 5 satellite image mosaic. Topography is exaggerated one and one-half times. (Courtesy of NASA/JPL)

    Reasons for patterns

  • Reasons for patternsPopulation change in Los Angles since 1890. (Data from US Census Bureau)

    Chart3

    50395

    102479

    319198

    576673

    1238048

    1504277

    1970358

    2479015

    2816061

    2966850

    3485398

    3694820

    Population

    Year

    Number of People

    Population Change in Los Angeles, CA

    Sheet1

    YearPopulation

    18501610

    18604385

    18705728

    188011183

    189050395

    1900102479

    1910319198

    1920576673

    19301238048

    19401504277

    19501970358

    19602479015

    19702816061

    19802966850

    19903485398

    20003694820

    Sheet1

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    0

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    Population

    Year

    Number of People

    Population Change in Los Angeles, CA