Effects of urban heat island and increased temperature on convective rainfall in Taichung city

Shien Tsung Chen, Yan Jin Lai, Yu Chi Wang

Research output: Contribution to journalArticlepeer-review

Abstract

Urban heat island changes the micrometeorology of urban area and can alter the convective rainfall. This study investigated the effects of urban heat island and increased temperature on convective rainfall in Taichung City. Spatial analysis of temperature data revealed the urban heat island effect in Taichung. The urban heat island intensity is estimated 0.14° per decade. Convective rainfall events were extracted from long-term hourly rainfall records in urban region. Rainfall characteristics of convective rainfall event, including rainfall depth, intensity, and maximum intensity, were analyzed. Results showed that the three rainfall characteristics are increasing as the temperature increases. This study further discovered the effects of increased temperature on convective rainfall characteristics. As the urban temperature increases more than 1°, the characteristics of convective rainfall also increase and approximate to fixed rates of about 10% to 50%. The increased rates of convective rainfall characteristics in relation to urban heat island are significantly greater than the increase of about 7% in atmospheric water-holding capacity as a temperature increase of 1°.

Original languageEnglish
Pages (from-to)13-22
Number of pages10
JournalTaiwan Water Conservancy
Volume64
Issue number3
Publication statusPublished - 2016 Jan 1

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Water Science and Technology

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