| Popis: |
Being a ‘hotspot’ of sea level rise and a densely populated area, the Atlantic coast of U.S. is a site of scientific interest with high societal significance. Coincidentally, this area also hosts a number of long-span tide gauges and other high quality in-situ observations. The advent of dedicated coastal processing and synthetic aperture radar (SAR) altimeters has provided more reliable, higher resolution observations to enable better understanding of how sea level on the shelf is linked to the open ocean. To further constrain the sea level reconstructions and future sea level projections in the coastal regions, better understanding of processes affecting sea level is needed. The aim of this study is to understand the sources of variability in VLM-corrected sea level measured by tide gauges and geocentric sea level, and the differences between them.We are using along-track geocentric sea level anomaly from Sentinel-3A SAR altimeter, sea level anomalies from high resolution ocean model, VLM correction from GNSS stations, and hourly total water level measurements from a set of 16 tide gauges along the Atlantic coast of the U.S. By developing a statistical model for sea level at tide gauges and geocentric sea level on the shelf, the differences in variability are partitioned. Finally, these differences are compared to change in climatic variables to provide a discussion about the geophysical origins of observed variability differences. |
