DOI: 10.5194/cp-13-135-2017
Scopus记录号: 2-s2.0-85013141350
论文题名: Changes to the tropical circulation in the mid-Pliocene and their implications for future climate
作者: Corvec S. ; Fletcher C.G.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2017
卷: 13, 期: 2 起始页码: 135
结束页码: 147
语种: 英语
Scopus关键词: climate change
; climate modeling
; Kimmeridgian
; marine environment
; meridional circulation
; paleoclimate
; Pliocene
; sea surface temperature
; troposphere
; Walker circulation
; Indian Ocean
英文摘要: The two components of the tropical overturning circulation, the meridional Hadley circulation (HC) and the zonal Walker circulation (WC), are key to the re-distribution of moisture, heat and mass in the atmosphere. The mid-Pliocene Warm Period (mPWP; ∼3.3-3 Ma) is considered a very rough analogue of near-term future climate change, yet changes to the tropical overturning circulations in the mPWP are poorly understood. Here, climate model simulations from the Pliocene Model Intercomparison Project (PlioMIP) are analyzed to show that the tropical overturning circulations in the mPWP were weaker than preindustrial circulations, just as they are projected to be in future climate change. The weakening HC response is consistent with future projections, and its strength is strongly related to the meridional gradient of sea surface warming between the tropical and subtropical oceans. The weakening of the WC is less robust in PlioMIP than in future projections, largely due to inter-model variations in simulated warming of the tropical Indian Ocean (TIO). When the TIO warms faster (slower) than the tropical mean, local upper tropospheric divergence increases (decreases) and the WC weakens less (more). These results provide strong evidence that changes to the tropical overturning circulation in the mPWP and future climate are primarily controlled by zonal (WC) and meridional (HC) gradients in tropical-subtropical sea surface temperatures. © 2017 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/48942
Appears in Collections: 气候变化与战略
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Recommended Citation:
Corvec S.,Fletcher C.G.. Changes to the tropical circulation in the mid-Pliocene and their implications for future climate[J]. Climate of the Past,2017-01-01,13(2)