Estimation of air-sea heat flux from ocean measurements: An ill-posed problem

CORC > 南海海洋研究所 > 中国科学院南海海洋研究所 > 热带海洋环境国家重点实验室(LTO)

	Estimation of air-sea heat flux from ocean measurements: An ill-posed problem
	Zhu, J ; Kamachi, M ; Wang, DX
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
	2002
卷号	107 期号:C10 页码:-3159
关键词	air-sea heat flux data assimilation oceanic mixed layer the adjoint method
ISSN号	0148-0227
中文摘要	In this paper we addressed that the estimation of ocean surface heat flux from ocean temperature data is an ill-posed inverse problem, just like a well-known ill-posed problem: differentiation of noisy data. We reviewed engineering literature on such problems. Using a Mellor-Yamada level 2.5 closure model and simulated temperature data, we conducted numerical experiments of retrieving heat fluxes using variational data assimilation. This study shows that estimated nonsolar heat fluxes with high time resolution have large errors even if the observation errors are small. We also discussed the ill-posedness based on sensitivity coefficients. However, by applying some regularization methods and a longer assimilation window, it is feasible to estimate heat fluxes with reasonable accuracies, at least at some lower temporal resolution. On the basis of our model and experiment configurations, the high nonlinearity of the ocean mixed layer model also can cause difficulty in optimization when the assimilation window is long (e.g., 7 days). We proposed a modified an adjoint method approach and yielded good results.
学科主题	Oceanography
收录类别	SCI
原文出处	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000180568000035
公开日期	2011-07-03
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/5501]
专题	南海海洋研究所_热带海洋环境国家重点实验室(LTO)
推荐引用方式 GB/T 7714	Zhu, J,Kamachi, M,Wang, DX. Estimation of air-sea heat flux from ocean measurements: An ill-posed problem[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2002,107(C10):-3159.
APA	Zhu, J,Kamachi, M,&Wang, DX.(2002).Estimation of air-sea heat flux from ocean measurements: An ill-posed problem.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,107(C10),-3159.
MLA	Zhu, J,et al."Estimation of air-sea heat flux from ocean measurements: An ill-posed problem".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 107.C10(2002):-3159.