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Weakened miocene temperature response to orbital forcing compared to the modern-day
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DOI：10.5194/cp-22-879-2026.png)
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Abstract
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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.
Keywords:
orbital forcing
Miocene climate
temperature response
climate sensitivity
coupled climate model
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