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Milankovitch theory and monsoon
Cheng, H.; Li, H.Y.; Sha, L.J.; Sinha, A.; Shi, Z.G.; Yin, Q.; Lu, Z.Y.; Zhao, D.B.; Cai, Y.J.; Hu, Y.Y.; Hao, Q.Z.; Tian, J.; Kathayat, G.; Dong, X.Y.; Zhao, J.Y.; Zhang, H.W. (2022). Milankovitch theory and monsoon. The Innovation 3(6): 100338. https://dx.doi.org/10.1016/j.xinn.2022.100338
In: The Innovation. Elsevier: United States. e-ISSN 2666-6758
Peer reviewed article  
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  • Cheng, H.
  • Li, H.Y.
  • Sha, L.J.
  • Sinha, A.
  • Shi, Z.G.
  • Yin, Q.
  • Lu, Z.Y.
  • Zhao, D.B.
  • Cai, Y.J.
  • Hu, Y.Y.
  • Hao, Q.Z.
  • Tian, J.
  • Kathayat, G.
  • Dong, X.Y.
  • Zhao, J.Y.
  • Zhang, H.W.
Abstract
    The widely accepted "Milankovitch theory" explains insolation-induced waxing and waning of the ice sheets and their effect on the global climate on orbital timescales. In the past half century, however, the theory has often come under scrutiny, especially regarding its "100-ka problem." Another drawback, but the one that has received less attention, is the "monsoon problem," which pertains to the exclusion of monsoon dynamics in classic Milankovitch theory even though the monsoon prevails over the vast low-latitude (similar to 30 degrees N to similar to 30 degrees S) region that covers half of the Earth's surface and receives the bulk of solar radiation. In this review, we discuss the major issues with the current form of Milankovitch theory and the progress made at the research forefront. We suggest shifting the emphasis from the ultimate outcomes of the ice volume to the causal relationship between changes in northern high-latitude insolation and ice age termination events (or ice sheet melting rate) to help reconcile the classic "100-ka problem." We discuss the discrepancies associated with the characterization of monsoon dynamics, particularly the so-called "sea-land precession-phase paradox" and the "Chinese 100-ka problem." We suggest that many of these discrepancies are superficial and can be resolved by applying a holistic " monsoon system science" approach. Finally, we propose blending the conventional Kutzbach orbital monsoon hypothesis, which calls for summer insolation forcing of monsoons, with Milankovitch theory to formulate a combined "MilankovitchKutzbach hypothesis" that can potentially explain the dual nature of orbital hydrodynamics of the ice sheet and monsoon systems, as well as their interplays and respective relationships with the northern high-latitude insolation and inter-tropical insolation differential.
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