气候变化领域集成服务门户(CCPortal): Surging of global surface temperature due to decadal legacy of ocean heat uptake

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DOI	10.1175/JCLI-D-19-0874.1
	Surging of global surface temperature due to decadal legacy of ocean heat uptake
	Sinha B.; Sévellec F.; Robson J.; Nurser A.J.G.
发表日期	2020
ISSN	0894-8755
起始页码	8025
结束页码	8045
卷号	33 期号:18
英文摘要	Global surface warming since 1850 has consisted of a series of slowdowns (hiatus) followed by surges. Knowledge of a mechanism to explain how this occurs would aid development and testing of interannual to decadal climate forecasts. In this paper a global climate model is forced to adopt an ocean state corresponding to a hiatus [with negative interdecadal Pacific oscillation (IPO) and other surface features typical of a hiatus] by artificially increasing the background diffusivity for a decade before restoring it to its normal value and allowing the model to evolve freely. This causes the model to develop a decadal surge that overshoots equilibrium (resulting in a positive IPO state), leaving behind a modified, warmer climate for decades. Water-mass transformation diagnostics indicate that the heat budget of the tropical Pacific Ocean is a balance between large opposite-signed terms: surface heating/cooling resulting from air–sea heat flux is balanced by vertical mixing and ocean heat transport divergence. During the artificial hiatus, excess heat becomes trapped just above the thermocline and there is a weak vertical thermal gradient (due to the high artificial background mixing). When the hiatus is terminated, by returning the background diffusivity to normal, the thermal gradient strengthens to prehiatus values so that the mixing (diffusivity 3 thermal gradient) remains roughly constant. However, since the base layer just above the thermocline remains anomalously warm, this implies a warming of the entire water column above the trapped heat, which results in a surge followed by a prolonged period of elevated surface temperatures. Ó 2020 American Meteorological Society.
英文关键词	Atmospheric temperature; Diffusion; Heat flux; Mixing; Oceanography; Stream flow; Surface properties; Thermal gradients; American meteorological societies; Development and testing; Global surface temperature; Global surface warming; Inter-decadal pacific oscillations; Ocean heat transport; Tropical Pacific ocean; Water mass transformation; Climate models; air-sea interaction; climate modeling; decadal variation; diffusivity; global climate; heat budget; heat flux; heat transfer; surface temperature; temperature gradient; thermocline; vertical mixing; water mass; Pacific Ocean; Pacific Ocean (Tropical)
语种	英语
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/171121
作者单位	National Oceanography Centre, Southampton, United Kingdom; Laboratoire d’Océanographie Physique et Spatiale, Univ Brest CNRS IRD Ifremer, Brest, France, and Ocean and Earth Science, University of Southampton, Southampton, United Kingdom; National Centre for Atmospheric Science, Department of Meteorology, University of Reading, Reading, United Kingdom
推荐引用方式 GB/T 7714	Sinha B.,Sévellec F.,Robson J.,et al. Surging of global surface temperature due to decadal legacy of ocean heat uptake[J],2020,33(18).
APA	Sinha B.,Sévellec F.,Robson J.,&Nurser A.J.G..(2020).Surging of global surface temperature due to decadal legacy of ocean heat uptake.Journal of Climate,33(18).
MLA	Sinha B.,et al."Surging of global surface temperature due to decadal legacy of ocean heat uptake".Journal of Climate 33.18(2020).