Extended Global Mean Sea Level Budget Study
Event: 2019 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
Contribution: not provided
Additionally, despite the advances that have been made, the available record length limits our understanding. The GRACE mission ended in mid-2017, leaving the data record at only 15-years in length. To continue the record started by GRACE, the GRACE Follow-On (GRACE-FO) mission launched in 2018 with new data soon to be publicly released. However, the relatively short record from the two missions coupled with the gap between them still present challenges in examining long time-scale climate processes and limits budget studies to times when GRACE data is available. There have been numerous efforts to extend the steric sea level record prior to the Argo time period and thus infer the global change due to TWS, but there is considerable disagreement amongst the available steric products. A longer TWS record would allow for the evaluation of these steric datasets, while providing the opportunity to study the GMSL budget over the full length of the satellite altimeter record (1993 to present).
We apply a novel multivariate data analysis technique to meet the following objectives: 1) Extend the monthly data record of satellite-measured TWS back to 1979 to produce a dataset appropriate for studying lower-frequency natural variability, and 2) Fill gaps in the GRACE record to provide a continuous dataset of TWS from 2002 to 2017 that is consistent with GRACE measurements. This longer record of TWS allows for the study of longer-term natural variability that could impact the way we interpret the satellite sea level records, and allows for improved sea level budget studies that yield new insights into GMSL change.