@misc{10498/38353,
year = {2016},
month = {9},
url = {http://hdl.handle.net/10498/38353},
abstract = {This paper analyzes the availability and accuracy of
coastal altimetry sea level products in the Strait of Gibraltar. All
possible repeats of two sections of the Envisat and AltiKa groundtracks
were used in the eastern and western portions of the strait.
For Envisat, along-track sea level anomalies (SLAs) at 18-Hz posting
rate were computed using ranges from two sources, namely,
the official Sensor Geophysical Data Records (SGDRs) and the
outputs of a coastal waveform retracker, the Adaptive Leading
Edge Subwaveform (ALES) retracker; in addition, SLAs at 1 Hz
were obtained from the Centre for Topographic studies of the
Ocean and Hydrosphere (CTOH). For AltiKa, along-track SLA at
40 Hz was also computed both from SGDR and ALES ranges. The
sea state bias correction was recomputed for the ALES-retracked
Envisat SLA. The quality of these altimeter products was validated
using two tide gauges located on the southern coast of Spain. For
Envisat, the availability of data close to the coast depends crucially
on the strategy followed for data screening. Most of the rejected
data were due to the radar instrument operating in a low-precision
nonocean mode. We observed an improvement of about 20% in
the accuracy of the Envisat SLAs from ALES compared to the
standard (SGDR) and the reprocessed CTOH data sets. AltiKa
shows higher accuracy, with no significant differences between
SGDR and ALES. The use of products from both missions allows
longer times series, leading to a better understanding of the hydrodynamic
processes in the study area},
publisher = {Institute of Electrical and Electronics Engineers Inc.},
keywords = {coastal altimetry},
keywords = {data screening},
keywords = {retracking},
keywords = {Strait of Gibraltar (SoG)},
keywords = {tide gauge},
keywords = {validation},
title = {Coastal Altimetry Products in the Strait of Gibraltar},
doi = {10.1109/TGRS.2016.2565472},
author = {Gomez-Enri, Jesús and Cipollini, Paolo and Passaro, Marcelo and Vignudelli, Stefano and Tejedor Álvarez, María Begoña and Coca, Josep},
}