SEMINAR: AMP-student seminar thursday 22 april at noon

[areniers@rsmas.miami.edu]

Hi All,

you are invited for our next AMP student seminar this Thursday, April 22,
in the AMP seminar room (behind the aquarium as you enter the commons)
with two presentations, one by Jingshuang Xue and the second presentation
by Tripp Collins.

greetings,

Ad Reniers



Presentation title by Jingshuang Xue:

Internal Wave Signature Analyses with Synthetic Aperture Radar Images in
the Mid-Atlantic Bight

Abstract:
57 Synthetic Aperture Radar (SAR) images were collected over the
Mid-Atlantic Bight between July 14, 2006 and September 26, 2006 during the
Shallow Water 2006 experiment. Surface signatures of internal wave (IW)
packets in these images are analyzed. Different types of IW signatures are
determined as different intensity variations of radar backscattering from
the mean background level: single positive, single negative and double. A
defined signature mode parameter(Sm) is used here to describe the
different types by quantifying the ratio of positive modulation depth and
negative modulation depth of the IW signatures relative to the mean
background backscattering. The spatial variation on the wind field due to
the atmospheric effects, which always turns out unusual dark or bright
background, is one important cause for different signature types. Also,
the role of the surface winds in SAR signature is examined using
Air-Sea-Interaction Spars (ASIS) wind data. The statistic shows that the
dominant wind-IW direction is less than 90 (deg) and the Sm value both
shows the positive and negative type under such condition. A radar imaging
model run IW signature simulations and calculate their Sm value under
different wind speed and different wind direction and radar look direction
relative to IW propagation direction by assuming internal wave parameters
in MAB. The simulation result shows that the internal wave parameters
plays an important role in Sm value when the IW-wind direction is less
than 90(deg).

Tripp's info will follow shortly



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