The effect of Milankovitch variations in insolation on equatorial seasonality

Yosef Ashkenazy*, Ian Eisenman, Hezi Gildor, Eli Tziperman

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


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, including air and sea temperature, salinity, winds, and currents. It is shown that the equatorial seasonality is altered according to the insolation with, for example, either maximum sea surface temperature (SST) close to the vernal equinox and minimum SST close to the autumnal equinox or vice versa. The results may have important implications for understanding tropical climate as well as for the interpretation of proxy data collected from equatorial regions.

Original languageAmerican English
Pages (from-to)6133-6142
Number of pages10
JournalJournal of Climate
Issue number23
StatePublished - Dec 2010


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