RT journal article
T1 Coastal Altimetry Products in the Strait of Gibraltar
A1 Gomez-Enri, Jesús
A1 Cipollini, Paolo
A1 Passaro, Marcelo
A1 Vignudelli, Stefano
A1 Tejedor Álvarez, María Begoña
A1 Coca, Josep
A2 Física Aplicada
K1 coastal altimetry
K1 data screening
K1 retracking
K1 Strait of Gibraltar (SoG)
K1 tide gauge
K1 validation
AB This paper analyzes the availability and accuracy ofcoastal altimetry sea level products in the Strait of Gibraltar. Allpossible repeats of two sections of the Envisat and AltiKa groundtrackswere used in the eastern and western portions of the strait.For Envisat, along-track sea level anomalies (SLAs) at 18-Hz postingrate were computed using ranges from two sources, namely,the official Sensor Geophysical Data Records (SGDRs) and theoutputs of a coastal waveform retracker, the Adaptive LeadingEdge Subwaveform (ALES) retracker; in addition, SLAs at 1 Hzwere obtained from the Centre for Topographic studies of theOcean and Hydrosphere (CTOH). For AltiKa, along-track SLA at40 Hz was also computed both from SGDR and ALES ranges. Thesea state bias correction was recomputed for the ALES-retrackedEnvisat SLA. The quality of these altimeter products was validatedusing two tide gauges located on the southern coast of Spain. ForEnvisat, the availability of data close to the coast depends cruciallyon the strategy followed for data screening. Most of the rejecteddata were due to the radar instrument operating in a low-precisionnonocean mode. We observed an improvement of about 20% inthe accuracy of the Envisat SLAs from ALES compared to thestandard (SGDR) and the reprocessed CTOH data sets. AltiKashows higher accuracy, with no significant differences betweenSGDR and ALES. The use of products from both missions allowslonger times series, leading to a better understanding of the hydrodynamicprocesses in the study area
PB Institute of Electrical and Electronics Engineers Inc.
SN 0196-2892
YR 2016
FD 2016-09
LK http://hdl.handle.net/10498/38353
UL http://hdl.handle.net/10498/38353
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 21-sep-2026