Abstract
Persistence is an important property of precipitation and its related impacts. However, changes in persistent precipitation and the possible underlying mechanisms in the context of global warming have not yet been discussed in sufficient depth. In this study, the changes in persistent precipitation in summer and related atmospheric circulation patterns over the middle-lower reaches of the Yangtze River (MLRYZR)—a typical monsoon region frequently hit by consecutive rainfall events—are analyzed based on observed daily precipitation and NCEP/NCAR reanalysis data from 1961 to 2019. The results reveal that persistent precipitation events (PPs) tend to happen in a more persistent way, with increased frequency and intensity in the MLRYZR region. Mechanism analyses show that persistent precipitation has happened along with simultaneous enhancement of some large-scale atmospheric circulation patterns, including the Lake Baikal blocking (BB), the Okhotsk Sea blocking (OB), and the western Pacific subtropical high (WPSH). Such enhanced anomalous circulation patterns could persistently reinforce the convergence and supply of water vapor in the MLRYZR region, contributing to the increase in PPs in this region. Based on the above results, we are able to offer some new insights into the long-term changes in precipitation structure and the possible causes. This study is also expected to support attribution studies on regional precipitation changes in the future.
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Supported by the National Natural Science Foundation of China (41905083) and National Key Research and Development Program of China (2018YFC1507700).
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Yu, R., Zhai, P. Changes in Summer Persistent Precipitation over the Middle-Lower Reaches of the Yangtze River and Associated Atmospheric Circulation Patterns. J Meteorol Res 35, 393–401 (2021). https://doi.org/10.1007/s13351-021-0186-z
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DOI: https://doi.org/10.1007/s13351-021-0186-z