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兴趣联盟 - Mesoscale Eddies

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JO_Editor1 发表于 2012-3-6 02:02:46 | 显示全部楼层 |阅读模式
群主:chi

公告:From Prof. Huang: "Physical oceanography is now entering the regime of meso-scale eddies, i.e. on horizontal scale of 1-100km, vertical scale of meters. The fundamental theories of oceanic eddies, their observations, numerical simulations and applications to environments are the most important research frontiers for the next 10 or 20 years. "

(来源:http://www.joyocean.org/home/space.php?do=mtag&tagid=3
 楼主| JO_Editor1 发表于 2012-3-6 02:04:46 | 显示全部楼层
本帖最后由 JO_Editor1 于 2012-3-6 02:09 编辑

chi帖子:

Difference among "transient eddy", "standing eddy" and &quo

"Eddies" always means the perturbation part opposes to the time-mean flow and are considered as deviations from an average. This perturbation method is usually used in the model analytics and parameterization in the theory work.

"Transient eddies" indicates the perturbation part only varies with time or the deviation from the time mean.

"large-scale meanders in ACC––the 'standing eddies'" mentioned in Mei-Man Lee and Andrew Coward, 2003 indicates the perturbation part only varies with space or the deviation from the zonal mean or the meridional mean.

However, there is a concept not related to the perturbation method: "trapped" eddy flux.

"Trapped eddy flux" mentioned in A.M. Treguier et al., 2003 means "the amount of water trapped inside the eddies and then advected and carried with the eddies". It stands for an advective transport induced by the eddy propagation. The authors definite it as "The 'trapped' eddy flux is estimated by considering the volume, heat or salt anomaly of one eddy, multiplying it by the drift velocity, and taking into account the number of eddies per year." and "It is simply the product of the mean advective velocity by the averaged mass anomaly of an eddy."

"Symmetric eddies advected by a uniform background flow do not generate any eddy-induced velocity or transient eddy flux, but produce a significant 'trapped' flux."

These flux quantities are all worth being estimated.

(来源:http://www.joyocean.org/home/spa ... ;do=thread&id=6
 楼主| JO_Editor1 发表于 2012-3-6 02:05:58 | 显示全部楼层
本帖最后由 JO_Editor1 于 2012-3-6 02:10 编辑

回复 2# chi

air_sea评论:

In my opinion, the word "eddy" has two meanings. First, we generally call the perturbation part from mean background as "eddy" , it is more mathematic and dependent on how the "average" or "mean" is defined. Second, it is referred to the coherent vortice structures existing in the ocean, it can rotate and propagate, e.g. the mesoscale eddies.

This is my understanding, how about you?
 楼主| JO_Editor1 发表于 2012-3-6 02:08:52 | 显示全部楼层
本帖最后由 JO_Editor1 于 2012-3-6 02:10 编辑

chi帖子:

Difference between "current breaks into eddies" and "eddy-domina

Maybe "break into eddies" means there isn't any stable mean flow but only eddies or meanders.

Maybe "eddy-dominated current" means the unstable part of current becomes primary somewhere  in the current and shows significant eddy feature while the stable part is secondary.

(来源:http://www.joyocean.org/home/spa ... ;do=thread&id=7
hbsong 发表于 2012-3-6 07:57:12 | 显示全部楼层


现把为马老师八十寿辰做的学术报告后半段贴上,本报告也曾在黄老师的鼓励下在2011年南海所组织的涡旋论坛上报告,一些想法很不成熟,请大家批评指正。

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RuChen 发表于 2012-6-17 13:10:24 | 显示全部楼层
现在关于submesoscale eddy的研究也越来越多.
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