Composite differences in transient atmospheric circulations between P1 and P2 (P2 minus P1). (IMAGE)
Caption
(a) Time series of areal mean intensity of regional rainfall events in the YRV region during the Mei-yu period during 1961–2022 (units: mm d-1). Composite differences in transient (b) vertically integrated water vapor flux (unit: 10-5 kg m-1 s-1; vector) and water vapor divergence (unit: kg m-2 s-1; color), (c) 850-hPa wind (unit: m s-1; vector) and associated divergence (unit: 10-6 s-1; color), and (d) 500-hPa vertical velocity (unit: Pa s-1) associated with regional rainfall events in the YRV region during the Mei-yu period between P1 and P2 (P2 minus P1). Composite differences in the (e) intensity of regional rainfall events (unit: mm d-1) in the YRV region during the Mei-yu period between P1 and P2 (P2 minus P1). The red and blue lines in (a) denote the long-term trend and nine-year sliding average time series, respectively. The yellow dots in (b), (c), (d), the vectors in green in (b), (c), and the “+” symbols in (e) denote where the differences are significant at the 90% confidence level based on the Student’s t-test. The station data in Taiwan Province is not obtained in (e).
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