为什么地转理论被调用在热带地区关于? MJO就可- 江南体育网页版- - - - -地球科学堆江南电子竞技平台栈交换 最近30从www.hoelymoley.com 2023 - 07 - 07 - t07:19:34z //www.hoelymoley.com/feeds/question/13553 https://creativecommons.org/licenses/by-sa/4.0/rdf //www.hoelymoley.com/q/13553 5 为什么地转理论被调用在热带地区关于? MJO就可 BarocliniCplusplus //www.hoelymoley.com/users/704 2018 - 03 - 05 - t14:57:27z 2019 - 01 - 25 - t15:47:18z < p > < a href = " https://journals.ametsoc.org/doi/pdf/10.1175/1520 - 0493% - 281994% - 29122% - 3 - c0814%3aootdto%3e2.0.co%3b2”rel = " nofollow noreferrer " >本文< / >回顾Madden-Julian振荡,频繁地转理论(或近似地转)经常被调用。However, for geostrophic theory to be invoked, $$Ro=\frac{U}{f_0L}<<1$$. However, along the equator, $f_0=0$ and near the equator, $f_0\approx0$, which makes $Ro>>1$. But since this is a published paper, shouldn't the editor or reviewers caught this problem?

Some examples:

  1. Page 815, second to last paragraph in the first column: "These results are consistent with an oscillation that is -- at 850 hPa at least-- in approximate geostrophic balance."
  2. Page 816, first paragraph in the second column: "For geostrophic balance, the in-phase relationship is consistent with maximum pressure variations at the equator, while the more nearly out of phase relationship suggests maximum pressure variations off the equator."
 //www.hoelymoley.com/questions/13553/-/16033 # 16033 2 由gansub回答为什么地转理论被调用在热带地区关于? MJO就可 gansub //www.hoelymoley.com/users/1066 2019 - 01 - 24 t07:35:25z 2019 - 01 - 25 - t15:47:18z < p >最近的文献指出,试图理解背后的理论动态看到MJO就可在这两个出版物——< a href = " https://link.springer.com/article/10.1007/s00382 - 018 - 4433 - 7 # Equ2”rel = " nofollow noreferrer " >动力学模式与水分模式动态MJO就可< / >和< a href = " https://link.springer.com/article/10.1007%2fs00382 - 016 - 3448 - 1”rel = " nofollow noreferrer " >一般理论框架对理解的基本动力学Madden-Julian振荡< / > < / p > < p >得出的原始论文< a href = " https://journals.ametsoc.org/doi/pdf/10.1175/1520 - 0493% - 281994% - 29122% - 3 - c0814%3aootdto%3e2.0.co%3b2”rel = " nofollow noreferrer " > Madden和朱利安振荡< / >关键是要注意到,原来乔丹相位关系的观测是在表面压力和纬向风(850 hPa)或相位关系。没有这样的观察与经向风的关系。< / p > < p >中的“地转平衡”(非空间形式)MJO就可仅仅是这个方程< / p > < p > <跨类= " math-container " > u = - $ $ \β* y *(\压裂{\部分\φ}{\偏y}) $ $ < / span > < / p > < p > <跨类= " math-container " > \φ< / span >美元在这里代表第一斜压模式(热带地区斜压性的含义是完全不同的意思在中纬度)。在热带地区意味着什么是反向的风和水流方向垂直结构(cf。< a href = " https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2004RG000158 " rel = " nofollow noreferrer " >评论MJO就可< / >)。所以有斜压模式振动因为风MJO就可从850年hPa - 200 hPa反方向。< / p > < p >在假设(通过观察证明),可以用低频波MJO就可与各向异性水平长度尺度的区域长度规模远远大于经向规模10级。所以子午加速v-momentum方程可以被忽视。这种近似近似地转平衡的纬向风和经向压力梯度和所有高频inertio重力波,混合Rossby-gravity波以及短罗斯比波都过滤掉。所以只有潮湿开尔文和长罗斯比波以及。MJO就可< / p > < p >或者如果有人考虑< a href = " https://en.wikipedia.org/wiki/Rossby_radius_of_deformation " rel = " nofollow noreferrer " > < / >罗斯比半径变形的水平的扰动波长MJO就可如果等于罗斯比半径变形速度和质量领域进行相互调整见这些幻灯片——< a href = " https://www.ess.uci.edu/ ~余/类/ ess228 / lecture.5.waves.2017.all.pdf”rel = " nofollow noreferrer " >电波在大气< / > 52页。< / p > < p >相似的结论是来到热带地区获得平衡的动力学假设线性理论和浅水模型——< a href = " http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.582.8616&代表= rep1& type = pdf " rel = " nofollow noreferrer " >平衡动力学在热带地区< / > < / p > < p > <强> < /强>更新看其他同行评议参考,试图提供一个解释似乎MJO就可一个假设的线性理论关于不是普遍接受和非线性平流MJO就可有一个角色在慢慢传播行星尺度扰动(cf。< a href = " https://journals.ametsoc.org/doi/pdf/10.1175/1520 - 0469% - 281988% - 29045% - 3 - c0569%3aasmotd%3e2.0.co%3b2”rel = " nofollow noreferrer " > 40 - 50的简单模型振动< / >。 A later paper by Madden(cf.Seasonal variations of the 40-50 oscillations in the tropics reports that there can be substantial meridional wind perturbations bringing into question whether the assumption of geoostrophic balance is universally valid or not in the case of the MJO.

The original paper by MJ in the light of the observations obtained then perhaps made a conclusion that the structure and dynamics of the signal could resemble a Kelvin wave in which case the geostrophic balance of the Equatorial Kelvin wave (no large scale meridional wind perturbations and the equator acts as a wave guide ) could be used to explain the geostrophic balance in the case of the MJO. Later observations have proved this assumption incomplete.

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