@InProceedings{SoutoDiaCamSteKam:2014:NeDeRe,
author = "Souto, Roberto Pinto and Dias, Pedro Leite Da Silva and Campos
Velho, Haroldo Fraga de and Stephany, Stephan and Kampel, Milton",
affiliation = "{Laborat{\'o}rio Nacional de Computa{\c{c}}{\~a}o
Cient{\'{\i}}fica} and {Laborat{\'o}rio Nacional de
Computa{\c{c}}{\~a}o Cient{\'{\i}}fica} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de
Pesquisas Espaciais (INPE)} and {Instituto Nacional de Pesquisas
Espaciais (INPE)}",
title = "New developments on reconstruction of high resolution
chlorophyll-a vertical profiles",
booktitle = "Anais...",
year = "2014",
pages = "1--7",
organization = "Congresso Nacional de Matem{\'a}tica Aplicada e Computacional,
35. (CNMAC-2014).",
publisher = "SBMAC",
note = "Setores de Atividade: Administra{\c{c}}{\~a}o p{\'u}blica,
defesa e seguridade social.",
keywords = "problemas inversos, transfer{\^e}ncia radiativa, {\'o}tica
hidrol{\'o}gica.",
abstract = "We present a methodology to reconstruct vertical profiles of
chlorophyll-a pigment concentration in open-ocean waters based on
radiance values at different depths. The inverse problem is
formulated here as an optimization problem and iteratively solved
by an Ant Colony System (ACS) meta-heuristic. An objective
function is given by the square difference between computed and
experimental radiances at each iteration. The Laplace transform
discrete ordinate (LTSN) method is used to solve the radiative
transfer equation (direct problem) in order to compute the
radiances. In a first approach, this methodology was not able to
reconstruct profiles with two or more peaks of chlorophyll-a
concentration. This result can be partially explained by the
relatively low number of sampling points (11 points), that limits
the geometric resolution of the vertical profile to be
reconstructed. Alternatively, we propose the reconstruction
vertical profile using a higher geometric resolution, lower than
one meter, in order to evaluate the ability of identifying any
peak in chlorophyll-a concentration. A hybrid methodology is
adopted: initially, the original inverse ACS methodology is
employed to retrieve a high resolution profile (81 points), and
then this result is used as an initial guess for the deterministic
method of optimization Levenberg-Marquardt to refine the
profile.",
conference-location = "Natal",
conference-year = "2014",
isbn = "1984-8218",
label = "lattes: 1446664587151293 4 SoutoDiaCamSteKam:2014:NeDeRe",
language = "en",
targetfile = "souto_new.pdf",
volume = "1",
urlaccessdate = "29 mar. 2024"
}