Enhanced “Wind-Evaporation Effect” Drove the “Deep-Tropical Contraction” in the Early Eocene,Geophysical Research Letters

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Enhanced “Wind-Evaporation Effect” Drove the “Deep-Tropical Contraction” in the Early Eocene
Geophysical Research Letters ( IF 4.6 ) Pub Date : 2024-09-30 , DOI: 10.1029/2024gl108836
Zikun Ren, Tianjun Zhou, Zhun Guo, Meng Zuo, Linqiang He, Xiaolong Chen, Lixia Zhang, Bo Wu, Wenmin Man

The equatorward contraction of tropical precipitation, commonly referred to as the “deep-tropical contraction”, is witnessed in the paleoclimate simulations of the early Eocene. However, the mechanism driving this contraction is still unclear. Based on the energetics framework of the Intertropical Convergence Zone (ITCZ) and the decomposition method of the latent heat flux along with the simulations of a climate system model, CESM1.2, we proposed a novel mechanism responsible for the “deep-tropical contraction” in the early Eocene. The greenhouse gases-induced sea surface warming amplifies the sensitivity of evaporation to surface wind speed changes through Clausius-Clapeyron scaling, leading to an interhemispheric asymmetric enhancement of the latent heat flux. To maintain hemispheric energy balance, the cross-equatorial atmospheric energy transport must be reduced during the solstice seasons. As a result, the solstitial location of the ITCZ shifts equatorward, causing the “deep-tropical contraction” in the early Eocene.

更新日期：2024-10-01

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