Modulation of Tropical Instability Wave Intensity by Equatorial Kelvin Waves
نویسندگان
چکیده
منابع مشابه
Nonlinear Wave Packets of Equatorial Kelvin Waves
The weakly nonlinear dynamics of packets of equatorial Kelvin waves is studied using singular perturbation theory applied to the shallow water wave equations. Within the limits of the perturbation theory, which is formally restricted to weak mean shear and weak nonlinearity, we derive a Nonlinear Schroedinger equation to describe the envelope of the wave packet. We find that nonlinearity has a ...
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Introduction Conclusions References
متن کاملBeyond-All-Orders Instability in the Equatorial Kelvin Wave
The equatorial Kelvin wave is destabilized by cross-equatorial shear in a rather bizarre fashion. There is no well-defined inviscid neutral curve. Instead, using an exemplar the linear shear U(y) = 2y where U is the mean zonal flow and y is nondimensional latitude, the Kelvin wave is unstable for all 2, however, small. We show through multiple precision numerical calculations that the imaginary...
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Tropical Instability Waves (TIW) have been suggested to fertilize the equatorial Pacific in iron leading to enhanced ecosystem activity. Using a coupled dynamical–biogeochemical model, we show that contrary to this suggestion, TIWs induce a decrease of iron concentration by 20% at the equator and by about 3% over the “TIW box” [90°W180, 5°N-5°S]. Chlorophyll decreases by 10% at the equator and ...
متن کاملExcitation of Equatorial Kelvin and Yanai Waves by Tropical Cyclones in an Ocean General Circulation Model
Tropical cyclones (TCs) actively contribute to the dynamics of Earth’s coupled climate system. They influence oceanic mixing rates, upper-ocean heat content, and air–sea fluxes, with implications for atmosphere and ocean dynamics on multiple spatial and temporal scales. Using an ocean general circulation model with modified surface wind forcing, we explore how TC winds can excite equatorial oce...
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ژورنال
عنوان ژورنال: Journal of Physical Oceanography
سال: 2016
ISSN: 0022-3670,1520-0485
DOI: 10.1175/jpo-d-16-0064.1