Trend analysis of long-term change in annual mean equilibrium water temperature in Japan by mann-kendall test

Kohei Kamimura, Hitoshi Miyamoto

Research output: Contribution to journalArticlepeer-review

Abstract

This paper analyzed the trend in long-term change in annual mean equilibrium water temperatures and air temperatures all over Japan for 50 years (1963-2012), and investigated their regional characteristics. To analyze the time series data of the temperatures, Mann-Kendall test was used to statistically detect the trend and Sen's slope was used to quantitatively evaluate its significance. The results showed that a tendency for temperature to rise in the equilibrium water temperature was common in the coastal part of the Pacific Ocean in the western part from the Kanto region. In these areas, a positive correlation was found in the rising tendency between the equilibrium water temperature and the air temperature. Furthermore, a trend towards lowering of temperature in the equilibrium water temperature was detected more often in the northern part of Tohoku and Kyushu regions as well as the coastal part of the Sea of Japan. In these areas, there was a negative correlation between the equilibrium water temperature and the air temperature.

Original languageEnglish
Pages (from-to)154-160
Number of pages7
JournalJournal of Japan Society of Civil Engineers
Volume8
Issue number1
DOIs
Publication statusPublished - 2020

Keywords

  • Air temperature
  • Climate change
  • Equilibrium water temperature
  • Mann-Kendall test
  • River environment
  • Trend analysis

ASJC Scopus subject areas

  • Environmental Engineering
  • Civil and Structural Engineering

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