Since 1993, satellite altimeters have made continuous and near-global observations of sea level. Compared to tide gauges, the satellite record is relatively short and trends are heavily influenced by interannual to decadal variability. Isolating the trend associated with anthropogenic warming is a challenge and obscured by this naturally occurring variability. Several studies have tried to isolate these interannual or decadal changes and uncover the underlying signal. Here, we use cyclostationary empirical orthogonal functions (CSEOFs) to separate these signals in the altimetry data. In this presentation, we will introduce this method and show the analysis results specifically for El Niño Southern Oscillation (ENSO) and Pacific Decadal Oscillation (PDO). Our analysis will incorporate both GRACE measurements of mass-driven sea level changes and Argo measurements of steric sea level in an attempt to balance the sea level "budget" for these large-scale climate signals.

Se-Hyeon Cheon is a post-doctoral researcher at the Center for Coastal Physical Oceanography (CCPO), Old Dominion University. He obtained a doctorate from the Department of Construction and Engineering at Seoul National University in South Korea last year. In his thesis, he reconstructed sea level anomalies around the Korean Peninsula over 1901-2014 using several reanalyzed sea surface data and CSEOF decomposition scheme. Se-Hyeon came to ODU in November 2014 and has been researching sea level changes using CSEOF analysis with Dr. Ben Hamlington.

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