This paper investigates regime shifts in the wintertime Siberian High central intensity for the period from 1950 to 2017. One regime shift was found from a test for multiple regime shifts. A Markov switching model analysis identified the period of 1950-1987 as a strong intensity regime, 1988-2017 as a weak intensity regime, and 1987-1988 as the changepoint. We also found a regime shift in the wintertime temperature in Asia, which is consistent with that in the intensity of the anticyclone. The periods of 1950- 1986 and 1988-2017 are a low and high temperature regime, respectively, and the changepoint is 1986-1988.

This study examined the regime shifts in the temperature difference between Daegu and Jeju for the month of August using a Markov regime switching model. Using the long-term time series of averaged monthly temperature in August for 1923- 2015, we found the two regimes in the temperature difference with the regime shift taking place in 1952. The first regime, which spans the period from 1923 to 1951, is identified as Daegu, on average, being 0.2°C hotter than Jeju. The second regime, which starts in 1952 and persists until 2015, is characterized as the average temperature of Jeju being 0.4°C higher than that of Daegu. The results are consistent with a regime shift in the temperature of Jeju itself from a low temperature regime to a high temperature regime.