气候变化领域集成服务门户(CCPortal): A New Reference Model for the Evolution of Oceanic Lithosphere in a Cooling Earth

CCPortal

DOI	10.1029/2020JB021528
	A New Reference Model for the Evolution of Oceanic Lithosphere in a Cooling Earth
	Korenaga T.; Korenaga J.; Kawakatsu H.; Yamano M.
发表日期	2021
ISSN	21699313
卷号	126 期号:6
英文摘要	We present a new reference model for the evolution of oceanic lithosphere, which incorporates the effects of incomplete viscous relaxation, radiogenic heating, and secular cooling. The new reference model is based solely on thermal conduction, that is, without involving the occurrence of small-scale convection, and unlike the plate model, it does not contain unphysical boundary conditions. Yet, our model can explain both bathymetry and the heat flow data on the normal seafloor. The success of the new model owes to the use of realistic material properties in conduction modeling as well as the consideration of all of major processes that take place ubiquitously beneath seafloor. The effect of secular cooling on the bathymetry of old seafloor is particularly notable. Whereas secular cooling brings only weak temperature variations with an amplitude of ∼20 K, it can nonetheless affect global bathymetry substantially owing to the deep sensitivity of long-wavelength topography kernels. We suggest that the well-known fact that Earth has been cooling, which was not considered in any of previous reference models, may be the key to the long-standing puzzle of seafloor flattening. The new reference model is expected to be useful to better quantify the impact of the emplacement of hotspot islands and oceanic plateaus, the effect of small-scale convection, and the regional history of secular cooling in the convecting mantle. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	bathymetry; heat flow; mantle convection; radiogenic heating; secular cooling
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187041
作者单位	Department of Earth and Planetary Sciences, Yale University, New Haven, CT, United States; Earthquake Research Institute, University of Tokyo, Tokyo, Japan
推荐引用方式 GB/T 7714	Korenaga T.,Korenaga J.,Kawakatsu H.,et al. A New Reference Model for the Evolution of Oceanic Lithosphere in a Cooling Earth[J],2021,126(6).
APA	Korenaga T.,Korenaga J.,Kawakatsu H.,&Yamano M..(2021).A New Reference Model for the Evolution of Oceanic Lithosphere in a Cooling Earth.Journal of Geophysical Research: Solid Earth,126(6).
MLA	Korenaga T.,et al."A New Reference Model for the Evolution of Oceanic Lithosphere in a Cooling Earth".Journal of Geophysical Research: Solid Earth 126.6(2021).