@Article{MignacTanSanLimXie:2015:ArDaAs,
author = "Mignac, Davi and Tanajura, Clemente Augusto Souza and Santana,
Alex Novaes de and Lima, Leonardo Nascimento and Xie, Jiping",
affiliation = "{Universidade Federal da Bahia (UFBA)} and {Universidade Federal
da Bahia (UFBA)} and {Universidade Federal da Bahia (UFBA)} and
{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Chinese
Academy of Sciences}",
title = "Argo data assimilation into HYCOM with an EnOI method in the
Atlantic Ocean",
journal = "Ocean Science",
year = "2015",
volume = "11",
number = "1",
pages = "195--213",
keywords = "Assimila{\c{c}}{\~a}o de dados, Argo, Oceanografia
Operacional.",
abstract = "An ocean data assimilation system to assimilate Argo temperature
(T ) and salinity (S) profiles into the HYbrid Coordinate Ocean
Model (HYCOM) was constructed, implemented and evaluated for the
first time in the Atlantic Ocean (78\◦ S to 50\◦ N
and 98\◦ W to 20\◦ E). The system is based on the
ensemble optimal interpolation (EnOI) algorithm proposed by Xie
and Zhu (2010), especially made to deal with the hybrid nature of
the HYCOM vertical coordinate system with multiple steps. The Argo
T S profiles were projected to the model vertical space to create
seudoobserved layer thicknesses (1pobs), which correspond to the
model target densities. The first step was to assimilate 1pobs
considering the sub-state vector composed by the model layer
thickness (1p) and the baroclinic velocity components. After that,
T and S were assimilated separately. Finally, T was diagnosed
below the mixed layer to preserve the density of the model
isopycnal layers. Five experiments were performed from 1 January
2010 to 31 December 2012: a control run without assimilation, and
four assimilation runs considering the different vertical
localizations of T , S and 1p. The assimilation experiments were
able to significantly improve the thermohaline structure produced
by the control run. They reduced the root mean square deviation
(RMSD) of T and S calculated with respect to Argo independent data
in 34 and 44 %, respectively, in comparison to the control run. In
some regions, such as the western North Atlantic, substantial
corrections in the 20 \◦C isotherm depth and the upper
ocean heat content towards climatological states were achieved.
The runs with a vertical localization of 1p showed positive
impacts in the correction of the thermohaline structure and
reduced the RMSD of T (S) from 0.993 \◦C (0.149 psu) to
0.905 \◦C (0.138 psu) for the whole domain with respect to
the other assimilation runs.",
doi = "10.5194/os-11-195-2015",
url = "http://dx.doi.org/10.5194/os-11-195-2015",
issn = "1812-0784",
label = "lattes: 7758920363746942 4 MignacTanSanLimXie:2015:ArDaAs",
language = "en",
urlaccessdate = "02 maio 2024"
}