返回
The Impact of Scatterometer Wind Correction in Reanalysis Wind Forcing on the Modeling of NECC
孙志阔
中山大学
The QuikSCAT winds is used to correct the 10m winds from the two sets of reanalysis dataset: NCEP-NCAR and JRA55. However, these two types of wind product are inconsistent: equivalent 10 m neutral winds for QuikSCAT and the actual winds for reanalysis, respectively. The ocean currents have been included in the calculation of equivalent 10 m neutral winds so the correction of QuikSCAT may double count the surface ocean currents when calculating the surface wind stress. This study confirms that double-counting the ocean currents in the wind stress is an important source of error to simulate the upper ocean currents in the tropical Pacific, especially the North Equatorial Countercurrent (NECC). The corrected surface wind using QuikSCAT data will lead to about 50% reduction of averaged volume transport of NECC, 42% (3.1Sv) for NCEP-NACR and 58% (6.3Sv) for JRA55 reanalysis data. Using the sensitivity studies of Community Earth System Model 2 and its ocean component (POP2), we identified that the double-counting biases will result in about approximately 21% (3.6Sv) weaker NECC volume transports, which can explain about 50% of the biases due to the correction. An offline analysis using the observation data also confirms the impacts of the double-counting biases, but with nearly a half magnitude of reduction.