气候变化领域集成服务门户(CCPortal): Impact of coherent ocean stratification on AMOC reconstruction by coupled data assimilation with a biased model

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DOI	10.1175/JCLI-D-19-0735.1
	Impact of coherent ocean stratification on AMOC reconstruction by coupled data assimilation with a biased model
	Lu L.; Zhang S.; Yeager S.G.; Danabasoglu G.; Chang P.; Wu L.; Lin X.; Rosati A.; Lu F.
发表日期	2020
ISSN	0894-8755
起始页码	7319
结束页码	7334
卷号	33 期号:17
英文摘要	The Atlantic meridional overturning circulation (AMOC) is of great importance in Earth’s climate system, and reconstructing its structure and variability by combining observations with a coupled model is a key step in understanding historical and future states of AMOC. However, models always have systematic errors called bias owing to imperfect numerical representation of the real world. Model bias and the sparse nature of ocean observations, particularly in deep oceans, make it difficult to generate a complete historical picture of AMOC structure and variability. Here, two coupled models that are biased with respect to each other are used to design ‘‘twin’’ experiments to systematically study the influence of model bias on AMOC reconstruction. One model is used to produce the ‘‘observations’’ that sample the ‘‘true’’ solution of the AMOC to be reconstructed, while the other model is used to incorporate the ‘‘observations’’ to reconstruct the ‘‘truth’’ through coupled data assimilation (CDA). The degree to which the ‘‘truth’’ is recovered by a CDA scheme assesses the critical role of coherent (both upper- and deep-ocean incorporate enough observations to mitigate stratification instability) ocean stratification on AMOC reconstruction. Results show that balancing restoration of climatology and assimilation of observations is vital to better reconstruct AMOC structure and variability, given that most ocean observations are only available in the upper 2000 m. The gained results serve as a guideline in ocean-state estimation with a balance of deep restoring and upper data constraint for climate prediction initialization, especially for decadal predictions. © 2020 American Meteorological Society.
英文关键词	Climate models; Climatology; Earth (planet); Systematic errors; Atlantic meridional overturning circulations; Climate prediction; Data assimilation; Decadal predictions; Numerical representation; Ocean observations; Ocean stratification; Ocean-state estimation; Oceanography; climate modeling; climate prediction; data assimilation; decadal variation; experimental study; overturn; stratification
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/171150
作者单位	Key Laboratory of Physical Oceanography, Ministry of Education, Ocean University of China, Qingdao, China; Function Laboratory for Ocean Dynamics and Climate, Pilot National Laboratory for Marine Science and Technology (QNLM), Qingdao, China; International Laboratory for High-Resolution Earth System Prediction (iHESP), College Station, TX, United States; College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao, China; National Center for Atmospheric Research, Boulder, CO, United States; Department of Oceanography, Texas A&M University, College Station, TX, United States; Geophysical Fluid Dynamics Laboratory, National Oceanic and Atmospheric Administration, Princeton, NJ, United States; Program in Atmospheric and Oceanic Sciences, Princeton University, Princeton, NJ, United States
推荐引用方式 GB/T 7714	Lu L.,Zhang S.,Yeager S.G.,et al. Impact of coherent ocean stratification on AMOC reconstruction by coupled data assimilation with a biased model[J],2020,33(17).
APA	Lu L..,Zhang S..,Yeager S.G..,Danabasoglu G..,Chang P..,...&Lu F..(2020).Impact of coherent ocean stratification on AMOC reconstruction by coupled data assimilation with a biased model.Journal of Climate,33(17).
MLA	Lu L.,et al."Impact of coherent ocean stratification on AMOC reconstruction by coupled data assimilation with a biased model".Journal of Climate 33.17(2020).