Simulation of the effects of sea-salt aerosols on cloud ice and precipitation of a tropical cyclone
Simulation of the effects of sea-salt aerosols on cloud ice and precipitation of a tropical cyclone
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海盐气溶胶对热带气旋云冰和降水影响的模拟
DOI：
10.1002/asl.936
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发表时间：
2019
影响因子：
3
通讯作者：
Chen Baojun
中科院分区：
文献类型：
--
作者：
Jiang Baolin;Lin Wenshi;Li Fangzhou;Chen Baojun
这项研究使用了带有化学的天气研究和预报模式（WRF‐Chem），并对海盐气溶胶的排放进行了参数化，以评估海盐气溶胶对热带气旋的影响。进行了对照模拟（Ctl）和海盐排放通量为Ctl（低）十分之一的模拟。结果表明，海盐气溶胶增强了凝结过程，促进了热带气旋的垂直运动和降水。Ctl的降水峰值是Low的120%。Ctl垂直运动的增强导致水汽向高层大气的输送增加，从而促进云冰晶的沉积增长。因此，云冰混合比和层状降水在Ctl大于低。雨带中的层状降水量在Ctl约为0.5 mm/h，在Low约为0.4 mm/h。
This study used the Weather Research and Forecasting model with chemistry (WRF‐Chem) with a parameterization for the emissions of sea‐salt aerosols to assess the effects of sea‐salt aerosols on a tropical cyclone. A control simulation (Ctl) and a simulation with a sea‐salt emission flux that is one‐tenth of that in Ctl (Low) were conducted. Results show that sea‐salt aerosols enhance the condensation process, promoting vertical motion and precipitation in a tropical cyclone. Peak precipitation value in Ctl is 120% that in Low. Enhanced vertical motion in Ctl results in increase of water vapor transport to the upper atmosphere, which promotes deposition growth of cloud ice crystals. Therefore, cloud ice mixing ratio and stratiform precipitation in Ctl are larger than those in Low. Stratiform precipitation in the rain band is about 0.5 mm/h in Ctl and about 0.4 mm/h in Low.