Reconstructed long-term sea level variability in the North Atlantic Ocean
Event: 2017 Ocean Surface Topography Science Team Meeting
Session: Science I: Climate data records for understanding the causes of global and regional sea level variability and change
Presentation type: Type Poster
The sea level variability at multi-time scales in the North Atlantic Ocean has been well documented from observations and model experiments. In this work, we analyzed long-term sea level variability based on reconstructed sea level product (1900-2012), which combined SST with tide gauge and altimetry data using CSEOF (Cyclostationary Empirical Orthogonal Function) method. Compared with previous sea level reconstructions, (1) the trend at each grid of altimetry data was removed to reconstruct long-term variability and background trend, (2) Atlantic regions were reconstructed separately with Indo-Pacific and then recombined into a global reconstruction to avoid the dominance of Indo-Pacific in global basis functions. The results demonstrate that the reconstructed signal linked to Atlantic multidecadal oscillation (AMO). Moreover, compared with altimetry data, the reconstructed sea level in 20th century exhibits similar correlation spatial patterns with AMOC/NAO.