复旦大学梁佳团队研究了2021年7月20日，受远程热带气旋影响的中国郑州特大暴雨的多时间尺度水汽输送。这一研究成果于2025年3月19日发表在《大气科学进展》上。

2021年7月20日，中国郑州发生了一场24小时降水量为624.1毫米的特大热带气旋远程暴雨，在此期间，1700 LST时每小时降水量达201.9毫米，造成了重大的经济损失和人员伤亡。观测分析和后向轨迹模型表明，这场特大暴雨的低空水汽是由北太平洋西部（低空东南航道）增强的台风茵发在900 hPa以下的东南急流输送的。虽然900至800百帕之间的南风将发展中的台风Cempaka的水汽带到了南海（低空南风通道），但它并没有在郑州上空汇聚。进一步的多时间尺度分析表明，这两个低空水汽通道都表现出季节内时间尺度的特征。

台风“烟花”在30天以上的时间尺度内，通过季风槽北部的低空东南通道向郑州提供了丰富的水汽。低空南风通道与河南省东南部10-20天时间尺度上的波列中的反气旋环流有关，该波列输送了来自发台风和康帕卡台风的水蒸气。然而，低空偏南通道的水汽并没有在郑州上空汇聚；因此，在7月20日的特大暴雨期间，以台风烟花为水汽源，以900百帕以下30天以上的低空东南气流为水汽通道，对水汽输送起着至关重要的作用。

附：英文原文

Title: Multi-timescale water vapor transport for an extraordinary rainstorm in Zhengzhou, China, impacted by remote tropical cyclones on July 20, 2021

Author: Jia Liang, Yuhan Liu, Hui WANG

Issue&Volume: 2025-03-19

Abstract: An extraordinary tropical cyclone-remote rainstorm with a 24-hour precipitation amount of 624.1 mm occurred in Zhengzhou, China, on July 20, 2021, during which a severe hourly precipitation with the amount of 201.9 mm at 1700 LST caused significant economic losses and casualties. Observational analysis and the backward trajectory model showed that low-level water vapor for this extraordinary rainstorm was transported by the southeasterly jet below 900 hPa from the intensifying Typhoon In-Fa in the western North Pacific (low-level southeasterly channel). Although the southerly flow between 900 and 800 hPa brought the water vapor from the developing Typhoon Cempaka in the South China Sea (low-level southerly channel), it did not converge over Zhengzhou. Further multi-timescale analysis showed that these two low-level water vapor channels both exhibited a feature of an intraseasonal timescale. Typhoon In-Fa supplied abundant water vapor to Zhengzhou through a low-level southeasterly channel in the northern part of the monsoon trough on a timescale longer than 30 days. The low-level southerly channel was associated with an anticyclonic circulation in a wave train on a 10–20-day timescale to the southeast of Henan Province, transporting water vapor from Typhoons In-Fa and Cempaka. However, the water vapor in the low-level southerly channel did not converge over Zhengzhou; Thus, Typhoon In-Fa as the water vapor source and the low-level southeasterly flow on the timescale longer than 30 days below 900 hPa as the water vapor channel played an essential role in water vapor transport during the extraordinary rainstorm on July 20.

DOI: 10.1007/s00376-025-4419-4

Source: http://www.iapjournals.ac.cn/aas/en/article/doi/10.1007/s00376-025-4419-4viewType=HTML