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- W4245062034 abstract "台风临近大陆的过程中, 人为气溶胶的渗透位置、眼墙和外围雨带对流发展的竞争关系以及气溶胶直接、间接效应的分离贡献, 使对流增强区域和台风强度变化具有不确定性. 本文选取0920号台风“卢碧”作为研究个例, 利用WRF-Chem模式, 通过改变气溶胶初始和边界条件, 设计CTL(考虑临近大陆人为气溶胶的卷入及其直接和间接效应, 代表污染大气环境)和CLEAN试验(以海盐气溶胶为主, 代表清洁海洋大气环境), 对比分析考虑真实气溶胶效应对台风强度和降水模拟的影响; 并在此基础上增加CTLARIOFF试验(同CTL, 但关闭直接效应), 进一步讨论并分离ARI(气溶胶-辐射相互作用的直接效应)和ACI(气溶胶-云相互作用的间接效应)的贡献. 结果表明: 人为气溶胶在台风外围雨带和眼墙均有渗透,考虑真实气溶胶效应后的CTL试验可以整体减弱台风的强度并与观测更为接近. ARI对台风强度、眼墙及外雨带对流和降水变化的影响相对ACI是占主导的, 且两者的作用正好相反. ACI主要增强了眼墙中上部冰相水成物的生成, 释放更多的冻结潜热促进眼墙对流的增强. 眼墙上部更多的冰相水成物在下落过程中发生融化, 加速了雨滴对云滴的碰并收集(Pcacr), 促进了眼墙混合云降水过程, ACI的动力反馈使低层入流增强、高层出流增强, 眼墙强对流得以维持, 因此台风强度增强. 而ARI的作用正好相反, ARI效应通过吸收性气溶胶, 加热了台风远外围<sc>1~2km</sc>高度处的低层大气, 加热后的大气在径向入流过程中, 首先经过台风外围雨带, 因低层增温有利于对流发展, 引起外雨带对流增强, 阻止了暖湿气流向眼墙的输送, 使得眼墙对流和台风强度减弱. 在台风临近大陆的污染环境中, ARI相对ACI占主导, 且利用WRF-Chem模式完整考虑气溶胶-辐射-云相互作用, 可以改进台风强度和降水分布的模拟效果." @default.
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- W4245062034 date "2021-06-01" @default.
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- W4245062034 title "气溶胶效应对台风眼墙和外雨带的影响及分离贡献研究" @default.
- W4245062034 doi "https://doi.org/10.1360/sste-2020-0362" @default.
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