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Progress in Earth and Planetary Science
Fig. 6 | Progress in Earth and Planetary Science

Fig. 6

From: Coherent amplification of the Okhotsk high, Korean trough, and northwestern Pacific subtropical high during heavy rainfall over Japan in August 2021

Fig. 6

Spatial distributions of the COL index. Mean AS+ at 200 hPa (shading) and 500 hPa (contours) in the a August climatology and b heavy rainfall period in August 2021. c Anomalies of AS+ at 200 hPa (shading) and 500 hPa (contours) during the heavy rainfall period. d Tracking of the extracted depression at 200 hPa from development (18 UTC on August 2, 2021) to disappearance (12 UTC on August 13, 2021) with 6-hourly intervals. Color dots represent positions and optimal slope \(S_{o}\) of the depression. Green and blue circles denote optimal radius \(r_{o}\) (unit: km) when the depression was trough and cutoff low, respectively. The units of AS+ and optimal slope are m (100 km)−1

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