An Objective Method for Determining Ocean Mixed Layer Depth with Applications to WOCE Data
Huang, PQ; Lu, YZ; Zhou, SQ; sqzhou@scsio.ac.cn
2018
发表期刊JOURNAL OF ATMOSPHERIC AND OCEANIC TECHNOLOGY
卷号35期号:3页码:441-458
摘要A new method is developed to identify the mixed layer depth (MLD) from individual temperature or density profiles. A relative variance profile is obtained that is the ratio between the standard deviation and the maximum variation of the temperature (density) from the sea surface, and the depth of the minimum relative variance is defined as the MLD. The new method is robust in finding the MLD under the influence of random noise (noise level <= 5%). A comparison with other available methods, which include the threshold (difference, difference interpolation, gradient, and hybrid methods) and objective (curvature and maximum angle methods) methods, is carried out using the World Ocean Circulation Experiment (WOCE) data. It is found that for a variety of depth sampling resolutions ranging from 0.04 to 25 dbar, the new method and the difference-interpolation method predict MLD values that are closer to the visually inspected ones than those by other methods. Moreover, the quality index (QI) of the MLD that is determined by the new method is the highest when compared with those of the available methods. Also, the application of the new method on the WOCE global dataset yields 94% of MLD values with QI > 0.5, substantially higher than those (<= 86%) of other methods. Ultimately, it is found that the new method determines very similar MLD values when applied to temperature or density profiles globally because it identifies the base of the mixed layer rather than the uppermost depth of the thermocline. This unique advantage makes the new method applicable in many cases, especially when the density profile is unavailable.
部门归属[Huang, Peng-Qi; Lu, Yuan-Zheng; Zhou, Sheng-Qi] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China; [Huang, Peng-Qi] Univ Chinese Acad Sci, Beijing, Peoples R China
学科领域Engineering ; Meteorology & Atmospheric Sciences
资助项目LTO
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/17090
专题热带海洋环境国家重点实验室(LTO)
通讯作者sqzhou@scsio.ac.cn
推荐引用方式
GB/T 7714
Huang, PQ,Lu, YZ,Zhou, SQ,et al. An Objective Method for Determining Ocean Mixed Layer Depth with Applications to WOCE Data[J]. JOURNAL OF ATMOSPHERIC AND OCEANIC TECHNOLOGY,2018,35(3):441-458.
APA Huang, PQ,Lu, YZ,Zhou, SQ,&sqzhou@scsio.ac.cn.(2018).An Objective Method for Determining Ocean Mixed Layer Depth with Applications to WOCE Data.JOURNAL OF ATMOSPHERIC AND OCEANIC TECHNOLOGY,35(3),441-458.
MLA Huang, PQ,et al."An Objective Method for Determining Ocean Mixed Layer Depth with Applications to WOCE Data".JOURNAL OF ATMOSPHERIC AND OCEANIC TECHNOLOGY 35.3(2018):441-458.
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