多重時間尺度環流擾動對台灣與臨近地區日夜變化降水特性之影響

This is the final report of the four-year project entitled as "Impact of multiple timescale circulation change on the diurnal rainfall characteristics over Taiwan and nearby countries". With the support of this project, the project leader (PI) has designed and published 20 journal papers (including 13 SCI papers and 7 non-SCI papers), and jointed the publication of other 4 SCI papers that leaded by other researchers. A brief introduction of these papers is given in this report. For the 13 SCI papers that leaded by the PI, the research subjects can be mainly separated into two parts, including observational and modeling studies. The examined timescales of atmospheric circulation changes include interannual variation (Huang et al., 2019a; Huang et al., 2020), intraseasonal variation (Huang and Chang, 2018a; Huang et al., 2019b), past climate change (Huang and Chang, 2018b; Huang et al., 2018; Lee et al., 2021) and future projection (Huang et al., 2019c; Huang et al., 2021a). In addition, this project also partially supports the publication of satellite precipitation assessment studies (Huang et al., 2021b; Huang et al., 2021c; Huang et al., 2021d; Hsu et al., 2021). Among the published studies, we would like to call attention for the following works. First, on the interannual timescale, our research finding indicates that the interannual variation of convective afternoon rainfall (CAR) activity in Taiwan has been remotely affected by the sea surface temperature (SST) changed over Nino3.4 region, and the relationship between CAR and SST has been changed around 1985. The related findings have been published in Nature Scientific Reports (Huang et al., 2019a). Second, we have proved how large-scale diurnal circulation changes interacted with island-scale diurnal circulation changes to affect the spring precipitation changes in Taiwan's neighboring Luzon region. The related findings have been published in Nature Scientific Reports (Lee et al., 2021). Third, through the analysis of CMIP6 model data, we also found that the model estimates that the intensity of afternoon convective rainfall in the future will increase and the frequency will decrease in Taiwan and neighboring areas. The related findings have been published in Journal of Climate (Huang et al., 2021a). These research results help understand how the local rainfall change in Taiwan responses to the large-scale climate change.