Articles | Volume 20, issue 6
https://doi.org/10.5194/cp-20-1283-2024
https://doi.org/10.5194/cp-20-1283-2024
Research article
 | 
12 Jun 2024
Research article |  | 12 Jun 2024

Eccentricity forcing on tropical ocean seasonality

Luc Beaufort and Anta-Clarisse Sarr

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Cited articles

Ashkenazy, Y., Eisenman, I., Gildor, H., and Tziperman, E.: The Effect of Milankovitch Variations in Insolation on Equatorial Seasonality, J. Climate, 23, 6133–6142, https://doi.org/10.1175/2010JCLI3700.1, 2010. a, b, c
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Beaufort, L., Lancelot, Y., Camberlin, P., Cayre, O., Vincent, E., Bassinot, F., and Labeyrie, L.: Insolation cycles as a major control of the Equatorial Indian Ocean primary production, Science, 278, 1451–1454, 1997. a, b, c, d, e, f, g
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Short summary
At present, under low eccentricity, the tropical ocean experiences a limited seasonality. Based on eight climate simulations of sea surface temperature and primary production, we show that, during high-eccentricity times, significant seasons existed in the tropics due to annual changes in the Earth–Sun distance. Those tropical seasons are slowly shifting in the calendar year to be distinct from classical seasons. Their past dynamics should have influenced phenomena like ENSO and monsoons.
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