Abstract
Climate-related sea level changes in the world coastal zones result from the superposition of the global mean rise due to ocean warming and land ice melt, regional changes caused by non-uniform ocean thermal expansion and salinity changes, and by the solid Earth response to current water mass redistribution and associated gravity change, plus small-scale coastal processes (e.g., shelf currents, wind & waves changes, fresh water input from rivers, etc.). So far, satellite altimetry has provided global gridded sea level time series up to 10–15 km to the coast only, preventing estimation of sea level changes very close to the coast. Here we present a 16-year-long (June 2002 to May 2018), high-resolution (20-Hz), along-track sea level dataset at monthly interval, together with associated sea level trends, at 429 coastal sites in six regions (Northeast Atlantic, Mediterranean Sea, Western Africa, North Indian Ocean, Southeast Asia and Australia). This new coastal sea level product is based on complete reprocessing of raw radar altimetry waveforms from the Jason-1, Jason-2 and Jason-3 missions.
Highlights
Background & SummarySince the early 1990s, sea level is routinely measured globally and regionally by high-precision altimeter satellites
We have described a new coastal sea level product based on reprocessed satellite altimetry data from the Jason missions, available to users for a variety of applications, including studies of sea level change close to the coast and associated coastal impacts
This product is, to our knowledge, the first coastal sea level data set available at high along-track resolution (~300 m) over a time span longer than a decade
Summary
Since the early 1990s, sea level is routinely measured globally and regionally by high-precision altimeter satellites. Note that the increased along-track resolution of SAR altimeters are able to provide more accurate ocean range measurements in the 0–10 km coastal zone, but even there, inadequate geophysical corrections remain a strong limitation as far as the accuracy of the sea level product is concerned. Why is it important to precisely measure sea level in the coastal zone? It consists of: (1) monthly sea level anomalies time series at each 20-Hz point along the track, from June 2002 to May 2018, from 20 km offshore to the coast, and (2) sea level trends estimated over the study period at each 20 Hz point along the 20 km-long track portion
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