The Spatial and Temporal Distribution and Influencing Factors of"Dragon Boat Water"in Fujian Over the Past 60 Years
Each year around mid-May,the summer monsoon in the South China Sea delivers substantial rainfall to Fujian Province,a climatic phenomenon locally known as"Dragon Boat Water".This event not only brings replenishing rains,but also raises the potential for water-logging,as well as posing threats to urban safety and hindering socioeconomic development.Despite the significant impact,the underlying mechanisms influencing this phenomenon in China's southeastern province remain largely unexplored.Utili-zing daily precipitation data sourced from 60 meteorological stations across Fujian Province,combined with NCEP/NCAR reanalyzed monthly average wind and sea level pressure data,and NOAA reconstructed monthly average sea surface temperature(SST)data spanning from 1962 to 2021,this study aimed to delineate the spatial and temporal variations in"Dragon Boat Water"events over the past six decades.The results revealed that the"Dragon Boat Water"episodes have followed a pattern of initial decrease,succee-ded by an increase.Specifically,these events diminished between 1981 and 1995,exhibited a resurgence thereafter,progressively intensifying from the southeast to the northwest.A notable inverse relationship was discerned between the long-term trend of"Dragon Boat Water"and the activity of the subtropical high:a weaker subtropical high correlated with greater easterly positioning and increased"Dragon Boat Water",whereas a stronger high corresponded with a more westward position and diminished"Dragon Boat Water".Furthermore,El Niño years were characterized by a later onset of the monsoon season and less"Dragon Boat Water",whereas La Niña years experienced an earlier onset of the summer monsoon and a correspond-ing increase in"Dragon Boat Water".The study identified a recurrent 5～7 year cycle linking"Dragon Boat Water"with the ENSO phenomenon from the late 1970s to the early 21st century,underscoring the pivotal role of ENSO in modulating"Dragon Boat Water"on an interdecadal scale.
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