《Table 1.Initial RH in the sensitivity experiments.》

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《Impact of Mid-and Upper-Level Dry Air on Tropical Cyclone Genesis and Intensification:A Modeling Study of Durian(2001)》

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In order to investigate the impact of dry-air intrusion on TC genesis，a series of sensitivity experiments were conducted，by modifying the initial（at 0000 UTC 28 June 2001）value of RH in the outermost two domains in the mid-and upper troposphere（Table 1）.Figure 2 shows the RH distributions at the initial time in all experiments.When we conducted the high-resolution numerical simulation of the CTL experiment（Wang et al.，2016b），high RH greater than 90%at about（10?N，116?E）in the initial condition（Fig.2a）was one of the major determinant factors in successfully reproducing Durian’s genesis timing and location.Thus，the location of the high RH area was denoted as the key area hereafter.In RH-M，the initial mid-level（750–450 hPa）RH was reduced（Fig.2b）.Additionally，the other four experiments were conducted to investigate the impacts of dry air from the upper level（RH-H；450–150 hPa；Fig.2c）of the key area，and from surrounding mid-level areas:in the upstream southwest flow of the monsoon trough（RH-SW），in the upstream west flow of the monsoon trough（RH-W），and to the east of the monsoon trough（RH-E），respectively（Figs.2d–f and Table 1）.