Fig. 3: Time series of LOD and reconstructed LOD indices.
From: Skillful prediction of length of day one year ahead in multiple decadal prediction systems
a Time series of LOD anomaly from the observation (black line), ENSO&QBO-based reconstruction (red solid line) and ENSO-based reconstruction (red dashed line). The ENSO&QBO-based reconstruction is constructed by a linear combination of lagged Niño3 index from ERSSTv5 and 30-hPa equatorial zonal wind index from JRA-55 that best explains the observed LOD variation. The ENSO-based reconstruction is similarly constructed but using Niño3 index only. Numbers in parentheses represent the correlation between the LOD anomaly and each index. Significant values at the 95% confidence level, based on the two-tailed Student’s t-test, are indicated with double asterisks. b Same as (a) but for LOD anomaly and reconstructed LOD indices from MMM.
