AutoriA. Scozzari; J. Gomez-Enri; S. Vignudelli; F. Soldovieri
AbstractUsage and availability of Sea Surface Height (SSH)
information from satellite radar altimeters undergo known
limitations in the coastal zone, where such data are of great
importance and usefulness. In fact, coastal regions are a crucial
zone to be investigated and monitored, due to the high
impact that sea level and circulation changes have on the
environmental security and the related economic and societal
issues. It is known that radar returns from the sea surface
sometimes present target-like echoes ("bright targets"), especially
in correspondence of particular features of the coastal
zone, thus entailing a potential interference with the measurement
of SSH. Such spiky echoes generate hyperbolic
patterns in the radargram domain, which the recent literature
has tentatively explained as resulting from flat water areas in
the proximity of the coastline, but the physical mechanism
that underlies their occurrence still remains unclear. To probe
further into this aspect, this work describes a novel application
of a microwave tomographic reconstruction approach,
applied to the Envisat RA-2 signals, tested on selected passes
over the Pianosa Island (a 10 km2 island in the NW Mediterranean).
The aim of this study is the analytical identification
of the signal contamination sources in terms of location
and extension of their associated electromagnetic anomaly.
The obtained results confirm the idea that the origin of such
signatures is connected with particular conditions of the sea
surface, which are easier to be found in the proximity of
coastal closed areas such as gulfs, but presumably not limited
to such circumstances.
RivistaGeophysical Research Letters
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Linee di Ricerca IBFTA.P04.030.001