@Article{RamirezGutierrezDiasRaup:2017:MuAtIn,
author = "Ramirez Gutierrez, Enver Manuel Amador and Dias, Pedro L. da Silva
and Raupp, Carlos F. M.",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and
{Universidade de S{\~a}o Paulo (USP)} and {Universidade de
S{\~a}o Paulo (USP)}",
title = "Multiscale atmosphere-ocean interactions and the low-frequency
variability in the equatorial region",
journal = "Journal of the Atmospheric Sciences",
year = "2017",
volume = "74",
number = "8",
pages = "2503--2523",
month = "Aug.",
keywords = "Atmosphere-ocean interaction, Dynamics, Waves, atmospheric, Waves,
oceanic.",
abstract = "In the present study a simplified multiscale atmosphereocean
coupled model for the tropical interactions among synoptic,
intraseasonal, and interannual scales is developed. Two nonlinear
equatorial \β-plane shallow-water equations are considered:
one for the ocean and the other for the atmosphere. The nonlinear
terms are the intrinsic advective nonlinearity and the airsea
coupling fluxes. To mimic the main differences between the fast
atmosphere and the slow ocean, suitable anisotropic
multispace/multitime scalings are applied, yielding a balanced
synopticintraseasonalinterannualEl Niņo (SInEN) regime. In this
distinguished balanced regime, the synoptic scale is the fastest
atmospheric time scale, the intraseasonal scale is the
intermediate airsea coupling time scale (common to both fluid
flows), and El Niņo refers to the slowest interannual ocean time
scale. The asymptotic SInEN equations reveal that the slow wave
amplitude evolution depends on both types of nonlinearities.
Analytic solutions of the reduced SInEN equations for a single
atmosphereocean resonant triad illustrate the potential of the
model to understand slow-frequency variability in the tropics. The
resonant nonlinear wind stress allows a mechanism for the
synoptic-scale atmospheric waves to force intraseasonal
variability in the ocean. The intraseasonal ocean temperature
anomaly coupled with the atmosphere through evaporation forces
synoptic and intraseasonal atmospheric variability. The
waveconvection coupling provides another source for higher-order
atmospheric variability. Nonlinear interactions of intraseasonal
ocean perturbations may also force interannual oceanic
variability. The constrains that determine the establishment of
the atmosphereocean resonant coupling can be viewed as selection
rules for the excitation of intraseasonal variability (MJO) or
even slower interannual variability (El Niņo).",
doi = "10.1175/JAS-D-15-0325.1",
url = "http://dx.doi.org/10.1175/JAS-D-15-0325.1",
issn = "0022-4928",
language = "en",
targetfile = "ramirez_multiscale.pdf",
urlaccessdate = "27 abr. 2024"
}