Estimation of air-sea heat flux from ocean measurements: An ill-posed problem
Zhu, J; Kamachi, M; Wang, DX
2002
发表期刊JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
ISSN0148-0227
卷号107期号:C10页码:-3159
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.
部门归属Chinese Acad Sci, Inst Atmospher Phys, ICCES, Beijing 100029, Peoples R China; Japan Meteorol Agcy, Meteorol Res Inst, Oceanog Res Dept, Tsukuba, Ibaraki 3050052, Japan; Chinese Acad Sci, S China Sea Inst Oceanog, Lab Trop Marine Environm Dynam, Guangzhou 510301, Peoples R China
关键词Air-sea Heat Flux Data Assimilation Oceanic Mixed Layer The Adjoint Method
学科领域Oceanography
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收录类别sci
资助项目LED
WOS记录号WOS:000180568000035
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被引频次:10[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/5501
专题热带海洋环境国家重点实验室(LTO)
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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.
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