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Weakened miocene temperature response to orbital forcing compared to the modern-day
Zhang, Y.; Wei, J.; Li, Z.; Dai, N.; ZHENG, W.; Yin, Q.; Boer, A.M.; Shi, Z.; Zhang, L. (2026). Weakened miocene temperature response to orbital forcing compared to the modern-day. Clim. Past 22(4): 879-889. https://dx.doi.org/10.5194/cp-22-879-2026
In: Climate of the Past. Copernicus: Göttingen. ISSN 1814-9324; e-ISSN 1814-9332, meer
Peer reviewed article  
Beschikbaar in  Auteurs 
Author keywords
    climate;obliquity;middle;transition;insolation;evolution;holocene;southern;pliocene;warmth
Auteurs  Top 
  • Zhang, Y.
  • Wei, J.
  • Li, Z.
  • Dai, N.
  • ZHENG, W.
  • Yin, Q., meer
  • Boer, A.M.
  • Shi, Z.
  • Zhang, L.
Abstract
    Although orbital signal is widely identified in Miocene proxy records, the climate mechanisms linking insolation changes to regional temperature within this warm, low-ice period remains not well known. Here we use fully coupled climate model simulations to assess temperature response to maximum and minimum boreal summer insolation under Miocene and pre-industrial (PI) conditions. Under both conditions, temperature exhibits broadly anti-phased responses to increased and decreased insolation, but the Miocene response is overall weaker, with regionally dependent contrasts and reduced symmetry between two orbital cases. Three notable Miocene-PI differences emerge: (1) reduced boreal continental sensitivity in the Miocene due to dampened albedo, water-vapor and cloud feedbacks in a warmer, low-ice climate; (2) stronger Miocene cooling over tropical North Africa under high insolation, driven by intensified hydrological and moisture-feedbacks supported by a wider Tethys Sea; (3) reversed Southern Ocean anomalies under low insolation, where poleward-restricted Miocene sea ice enables winter insolation changes to trigger positive ice-albedo feedbacks. These results demonstrate that background climate state strongly modulates orbital-scale responses and provide important context for interpreting Miocene proxy records and long-term changes in Earth's climate sensitivity through the Neogene.
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