Statistical analysis of decadal warming and cooling trends in equilibrium water temperature in Japan

Hitoshi Miyamoto, Kohei Kamimura

Research output: Contribution to conferencePaperpeer-review

Abstract

In this paper, the seasonal trend of decadal change in equilibrium water temperature was examined in Japan for the recent 50 years from 1963 to 2012. For the time-series data in equilibrium water temperature, the statistical analysis used the Mann-Kendall test to detect a warming or cooling trend, and the Sen's slope to evaluate its quantitative values. The results showed that there were both warming and cooling trends in the decadal changes in the equilibrium water temperature. As for their regional distribution characteristics, the warming trend was evident in the coastal part of the Pacific Ocean in Japan. Both the global warming and urban heat island phenomenon could have had effects on this coastal part. On the other hand, the cooling trend was detected in the northern part, i.e., the Tohoku region and the southern part, north Kyushu region, as well as the coastal part of the Sea of Japan. These parts indicated a strong tendency on either a decrease in short wave radiation or an increase in latent heat transfers in the spring and summer seasons.

Original languageEnglish
Publication statusPublished - 2020
Event22nd Congress of the International Association for Hydro-Environment Engineering and Research-Asia Pacific Division: Creating Resilience to Water-Related Challenges, IAHR-APD 2020 - Sapporo, Virtual, Japan
Duration: 2020 Sep 142020 Sep 17

Conference

Conference22nd Congress of the International Association for Hydro-Environment Engineering and Research-Asia Pacific Division: Creating Resilience to Water-Related Challenges, IAHR-APD 2020
Country/TerritoryJapan
CitySapporo, Virtual
Period20/9/1420/9/17

Keywords

  • Global Warming
  • Mann-Kendall Test
  • Seasonality
  • Trend Analysis
  • Water Temperature

ASJC Scopus subject areas

  • Ecology
  • Environmental Engineering

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