Secular and seasonal reconstructing of global and regional sea level change
Event: 2022 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 Oral
Contribution: PDF file
Each contributions is defined from the mean of 1000 ensemble calculations. The standard deviation of the ensembles provides the uncertainty.
Globally, the reconstruction fits the global mean sea level (GMSL) observations from altimetry from 1992-2016, with only small monthly misfits (varies between +/- 0.5 cm), while the timeseries GRACE/GRACE-FO agrees with the monthly variations of the sum of the mass contributions (+/- 0.2 cm misfit). After 2016 the trends of Altimetry and the reconstruction begin to deviate with a total disclosure of up to 1.5 cm in 2021, while the mass contribution still aligns with GRACE/FO. Around 2016 we observe that the halosteric sea level contribution is declining, after been around zero from 1992-2015. This indicates a fault in the halosteric calculations possibly related to instrumental problems of the ARGO profiles that results in faulty salinity measurements. Removing the halosteric component removes around 50% of the misclosure, leaving the remaining disclosure unexplained.
Comparisons with altimetry and tide gauges at different locations will be shown at both seasonal and long-term time-scales.