A database of coastal sea level anomalies and associated trends from Jason satellite altimetry from 2002 to 2018
|Temporal extent||2002-06 -2018-05|
|Author(s)||The Climate Change Coastal Sea Level Team|
|Contributor(s)||Benveniste Jérôme, Birol Florence, Calafat Francisco, Cazenave Anny, Dieng Habib, Gouzenes Yvan, Legeais Jean-François, Legér Fabien, Niño Fernando, Passaro Marcello, Schwatke Christian, Shaw Andrew|
|Keyword(s)||Satellite altimetry, coastal sea level, coastal sea level trends|
Climate-related sea level change in the world coastal zones result from three types of contributions: (1) the global mean sea level rise due to ocean warming, land ice melt and terrestrial water storage change, (2) superimposed regional changes caused by non-uniform ocean thermal expansion and salinity changes, fingerprints of the solid Earth response to past and present-day land ice melt and associated gravitational variations, and atmospheric loading, and (3) small scale coastal processes due for example to shelf currents, wind & waves changes, fresh water addition to the sea in river estuaries and deltas. So far satellite altimetry provides global gridded sea level time series up to 10-15 km to the coast only, preventing from estimating how sea level change very close to the coast on interannual to decadal time scales. Here we present a 17-year-long (June 2002 to May 2018 ), high-resolution (20 H-z), along-track sea level dataset in coastal zones of six regions: Mediterranean Sea, Northeast Atlantic, West Africa, North Indian Ocean, Southeast Asia and Australia. The new coastal sea level data set is based on complete reprocessing of raw radar altimetry waveforms from the Jason-1, Jason-2 and Jason-3 missions to derive satellite-sea surface ranges as close as possible to the coast (a process called ‘retracking’) and optimization of the geophysical corrections applied to the range measurements to produce sea level time series at monthly interval, from 20 km offshore to the coast. This new coastal sea level product has been further analyzed to compute sea level trends over the 17-year time span at each along-track 20-Hz point, from 20 km offshore to the coast. A severe selection has been carried out on all coastal portions of satellite tracks crossing land, leading to retain a set of 429 coastal sites of valid sea level time series and trend values. These are presented and validated in this paper. The methodology developed to obtain them is also described.
This dataset is derived from the ESA SL_cci+ coastal sea level anomalies (DOI:10.5270/esa-sl_cci-xtrack_ales_sla-200206_201805-v1.1-202005) available under request on the ESA SL_cci website (http://www.esa-sealevel-cci.org/products).
|Acknowledgements||The authors gratefully acknowledge funding for this work; The European Space Agency supported the two phases of the Climate Change Initiative (CCI) for Sea Level and the CCI+ phase for Coastal Sea Level, which has provided the majority of the support leading to the outcomes herein described.|
Jason-1, Jason-2, Jason-3 altimeter satellites