Southwest China (SWC) is located in the transition zone affected by the East Asia summer monsoons, India monsoon, and the Tibetan Plateau thermal activity. SWC is also an important hub for water vapor transport in the Asia–Pacific (AP) region. Here we study the dynamical and spatiotemporal characteristics of extreme rainfall events in AP by a synchronization network approach, providing insights for understanding of the relevant synchronization mechanisms of extreme rainfall between the SWC and AP. It is found that the probability of significant synchronization rainfall events between SWC and AP as a function of distance changes from a power-law decay behavior to a teleconnection one at around 2000 km. Specifically, the SWC—the middle and lower reaches of the Yangtze River—Japan band (SYJ) is an important teleconnection pattern of extreme rainfall in AP region. This SYJ teleconnection pattern is associated with the water vapor flux convergence along the main water vapor transport route from the low latitude ocean. Moreover, we find that the inter-annual variation of the SYJ teleconnections index can reflect the evolution of synchronization rainfall features from SWC to Japan, which could be useful for operational climate monitoring and prediction. It is also found that the SYJ index is strongly correlated with the sea surface temperature anomalies (SSTA) over the North Indian Ocean and the Western Pacific. The warm Indian Ocean and Western Pacific SST can motivate the transfer of water vapor from SWC to Japan, yielding the synchronization of extreme rainfall along the SYJ band.
|Number of pages||15|
|State||Published - Dec 2021|
Bibliographical noteFunding Information:
This research was supported by the National Key Research and Development Program of China (2018YFC1507702), the National Natural Science Foundation of China Project (Grant Nos. 42075057, 41875100 and 61573173) and Qinghai Science and Technology Department Project (2021-ZJ-757).
We are grateful for the data resources provided by NOAA-CIRES-DOE Twentieth Century Reanalysis, NCEP-DOE Reanalysis 2 and the European Center for Medium-Range Weather Forecasts. And thanks to Fan Jingfang for helping to revise the paper.
© 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.
- Extreme rainfall
- Sea surface temperature anomalies
- Southwest China and Asia–Pacific
- Synchronizations networks