Effects of the Tibetan High and the North Pacific High on the Occurrence of Hot or Cool Summers in Japan

In this study, we investigated the effects of Tibetan High near tropopause and North Pacific in troposphere on occurrences hot or cool summers Japan. We first classified Japan into six regions identified summer years these from a 38-year sample (1980–2017) based monthly air temperature. To investigate features circulation fields over Asia during Japan, calculated composite differences (hot minus years) several variables such as geopotential height, which indicated significant high-pressure anomalies lower stratosphere. These results suggest that both Highs tend to extend years, while seem be associated with weakening highs. found extension Japanese mainland can lead Northern, Eastern, Western On other hand, Southwestern Islands may due south. Similarly, latitudinal direction is profoundly connected climate respective regions.