A note on the deficiency of NCEP/NCAR reanalysis surface winds over the equatorial Indian Ocean
A note on the deficiency of NCEP/NCAR reanalysis surface winds over the equatorial Indian Ocean
复制标题
关于NCEP/NCAR再分析赤道印度洋海面风缺陷的说明
DOI：
10.1029/2002jc001497
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发表时间：
2003
影响因子：
--
通讯作者：
D. Sengupta
中科院分区：
文献类型：
--
作者：
B. Goswami;D. Sengupta
季节周期和季节内变化的国家环境预测中心/国家大气研究中心（NCEP）再分析表面风在印度洋（IO）进行了评估，通过比较它们与现场表面观测从两个系泊浮标和风SeaWinds散射计上的QuikSCAT卫星。浮标位于孟加拉湾中部和阿拉伯海东部。QuikSCAT和NCEP的风场产品都很好地再现了现场观测的季节循环和季节内变化（10-60天）。然而，在赤道IO，季节平均NCEP风速可以小2 -3 ms^{-1}$，季节内变率的幅度只有QuikSCAT风的一半左右。NCEP纬向风的系统误差与赤道IO季节循环的年平均值或振幅相当。再分析风场平均和季节内变率的系统误差与NCEP降水分析的系统误差有关。
The seasonal cycle and intraseasonal variability of the National Centers for Environmental Prediction/National Center for Atmospheric Research (NCEP) reanalysis surface winds over the Indian Ocean (IO) are assessed by comparing them with in situ surface observations from two moored buoys and winds from the SeaWinds scatterometer on the QuikSCAT satellite. The buoys are located in the central Bay of Bengal and eastern Arabian Sea. Both QuikSCAT and NCEP wind products reproduce closely the seasonal cycle and intraseasonal variability (10–60 day) in the in situ observations. In the equatorial IO, however, the seasonal mean NCEP wind speeds can be $2-3 ms^{-1}$ smaller and the amplitude of intraseasonal variability only about half that of QuikSCAT winds. The systematic errors of NCEP zonal winds are comparable to the annual mean or amplitude of the seasonal cycle in the equatorial IO. It is suggested that the systematic error of mean and intraseasonal variability of reanalysis winds is related to systematic error in the NCEP analysis of precipitation.