基于热带太平洋SST和850 hPa风资料,分析了西太平洋暖池东界和东太平洋暖池南界的年际和年代际变异,并探讨了赤道太平洋纬向风异常对西太平洋暖池纬向运移的驱动作用以及热带东北太平洋经向风异常对东太平洋暖池经向变动的影响。在此基...基于热带太平洋SST和850 hPa风资料,分析了西太平洋暖池东界和东太平洋暖池南界的年际和年代际变异,并探讨了赤道太平洋纬向风异常对西太平洋暖池纬向运移的驱动作用以及热带东北太平洋经向风异常对东太平洋暖池经向变动的影响。在此基础上,研究了西太平洋暖池和东太平洋暖池变异对ENSO循环的联合影响,并提出了一个联合影响指数。结果表明,当联合指数为1.6时,有可能出现一次新的El Ni o事件。这为ENSO的形成和演变机制研究提供了一个新的线索。展开更多
A P-vector method was optimized using variational data assimilation technique, with which the vertical structures and seasonal variations of zonal velocities and transports were investigated. The results showed that w...A P-vector method was optimized using variational data assimilation technique, with which the vertical structures and seasonal variations of zonal velocities and transports were investigated. The results showed that westward and eastward flowes occur in the Luzon Strait in the same period in a year. However the net volume transport is westward. In the upper level (0m -500m),the westward flow exits in the middle and south of the Luzon Strait, and the eastward flow exits in the north. There are two centers of westward flow and one center of eastward flow. In the middle of the Luzon Strait, westward and eastward flowes appear alternately in vertical direction. The westward flow strengthens in winter and weakens in summer. The net volume transport is strong in winter (5.53 Sv) but weak in summer (0.29 Sv). Except in summer, the volume transport in the upper level accounts for more than half of the total volume transport (0m bottom). In summer, the net volume transport in the upper level is eastward (1.01 Sv), but westward underneath.展开更多
文摘基于热带太平洋SST和850 hPa风资料,分析了西太平洋暖池东界和东太平洋暖池南界的年际和年代际变异,并探讨了赤道太平洋纬向风异常对西太平洋暖池纬向运移的驱动作用以及热带东北太平洋经向风异常对东太平洋暖池经向变动的影响。在此基础上,研究了西太平洋暖池和东太平洋暖池变异对ENSO循环的联合影响,并提出了一个联合影响指数。结果表明,当联合指数为1.6时,有可能出现一次新的El Ni o事件。这为ENSO的形成和演变机制研究提供了一个新的线索。
基金Supported by the Major State Basic Research Program (No. G1999043810) Open Laboratory for Tropical Marine Environmental Dynamics (LED)+2 种基金 South China Sea Institute of Oceanology Chinese Academy of Sciences and the NSFC (No. 40306004).
文摘A P-vector method was optimized using variational data assimilation technique, with which the vertical structures and seasonal variations of zonal velocities and transports were investigated. The results showed that westward and eastward flowes occur in the Luzon Strait in the same period in a year. However the net volume transport is westward. In the upper level (0m -500m),the westward flow exits in the middle and south of the Luzon Strait, and the eastward flow exits in the north. There are two centers of westward flow and one center of eastward flow. In the middle of the Luzon Strait, westward and eastward flowes appear alternately in vertical direction. The westward flow strengthens in winter and weakens in summer. The net volume transport is strong in winter (5.53 Sv) but weak in summer (0.29 Sv). Except in summer, the volume transport in the upper level accounts for more than half of the total volume transport (0m bottom). In summer, the net volume transport in the upper level is eastward (1.01 Sv), but westward underneath.
