論文ID: 21B-002
Tropical cyclones (TCs) contribute to hydroclimates. The relationship between TC-related rainfall and TC activity was investigated using a high-resolution global atmospheric model. To separate the influences of the interannual variability of sea surface temperature (SST), a 64-member ensemble simulation was conducted for 11 TC seasons. TC direct rainfall (TCDR) and indirect rainfall (TCIR), within and away from the 500-kilometer distance from the TC center, were separately examined.
The results show that TCDR was strongly correlated with TC activity, while TCIR was moderately correlated with TC activity. When TCs were more active, TCDR increased by more than twice in the southwestern region of Japan, and TCIR increased by up to 20% in the western part of Japan and the Pacific coastline of eastern Japan.
A simple regression analysis showed that the relationship between seasonal TC activity and TC-related rainfall was independent of the interannual variability of the SST for TCDR but dependent on TCIR in the analysis area. The independent relationship between TC activity and TCDR likely becomes a useful metric for intermodel comparison and evaluation of the impact of global warming.
