ENSO-related variability of monthly mean streamflow for the Jiulong River in Fujian Province, Southeast China
- 环境生态－会议论文 
Several studies have shown significant relationships between the El Nin?o-Southern Oscillation (ENSO) and streamflows at global, regional and local scales. This paper presents an overview of the relationship between the ENSO and mean-monthly streamflows (1967-2008) of five hydrological stations in the Jiulong River in Fujian Province, Southeast China. Results show that in the 24-month life cycle of warm phase of ENSO (El Nin?o), it tends to have lower streamflows in the first spring (from March through May), and higher streamflows in the first winter (from December through February) and the second spring. During the period of cold phase of ENSO (La Nin?a), it tends to have lower streamflows in the first winter and the second spring. Meanwhile, a lag correlation between the mean-monthly streamflows and surface sea temperature anomalies is also examined. Results show that, during El Nin?o events, streamflows have strong lag correlations from zero to six months with surface sea temperature anomalies (r = 0.250-0.576 at the 99% level, the strongest ones are one to three months), and weak lag correlations from three to four months in the period of La Nin?a events (r = 0.238-0.289 at the 99% level) for the Jiulong River. The likely reason for the difference is that the typical El Nin?o events persist for some 18 months, while a La Nin?a condition can last up to two years or more, so an further study finds that, during period of long La Nin?a events (longer than two years), the streamflow responses to SSTA lags by two to five months, with stronger correlations between 0.339-0.559 at the 99% level. These conclusions are invaluable for management of water resources, particularly in the dry seasons of the watershed. ? 2011 IEEE.