Equatorial insolation: from precession harmonics to eccentricity frequencies

Equatorial insolation: from precession harmonics to eccentricity frequencies

Equatorial insolation: from precession harmonics to eccentricity frequencies A. Berger, M. F. Loutre, and J. L. Mélice Université catholique de Louvain, Institut d’Astronomie et de Géophysique G. Lemaı̂tre, 2 Chemin du Cyclotron, 1348 Louvain-la-Neuve, Belgium Department of Oceanography, University of Cape Town, Rondebosch 7701, South Africa Received: 22 June 2006 – Accepted: 9 July 2006 – Publi...

Observations of discrete harmonics emerging from equatorial noise

A number of modes of oscillations of particles and fields can exist in space plasmas. Since the early 1970s, space missions have observed noise-like plasma waves near the geomagnetic equator known as 'equatorial noise'. Several theories were suggested, but clear observational evidence supported by realistic modelling has not been provided. Here we report on observations by the Cluster mission t...

The Effect of Milankovitch Variations in Insolation on Equatorial Seasonality

Although the sun crosses the equator 2 times per year at the equinoxes, at times in the past the equatorial insolation has had only one maximum and one minimum throughout the seasonal cycle because of Milankovitch orbital variations. Here a state-of-the-art coupled atmosphere–ocean general circulation model is used to study the effect of such insolation forcing on equatorial surface properties,...

Orbital tuning, eccentricity, and the frequency modulation of climatic precession

[1] The accuracy of geologic chronologies can, in principle, be improved through orbital tuning, the systematic adjustment of a chronology to bring the associated record into greater alignment with an orbitally derived signal. It would be useful to have a general test for the success of orbital tuning, and one proposal has been that eccentricity ought to covary with the amplitude envelope assoc...

On fluid motion in librating ellipsoids with moderate equatorial eccentricity