如何找到风的高度高于平均海平面预测数据,如GFS -地球科学栈交流吗江南电子竞技平台江南体育网页版 最近30从www.hoelymoley.com 2023 - 07 - 08 - t20:33:03z //www.hoelymoley.com/feeds/question/23707 https://creativecommons.org/licenses/by-sa/4.0/rdf //www.hoelymoley.com/q/23707 4 如何找到风的高度高于平均海平面在如GFS预报数据 AlexandreBorowczyk //www.hoelymoley.com/users/26668 2022 - 04 - 08 - t16:56:52z 2022 - 04 - 08 - t19:34:39z < p >我想检索从天气预报(如GFS或HRRR)风的U和V分量对一些高度(米)高于平均海平面。< / p > < p >,我实现一个插入后同样的想法如下的链接。https://stackoverflow.com/a/61107634/6528830 < a href = " https://stackoverflow.com/a/61107634/6528830 " > < / > < / p > < p >然而,我困惑的结果看起来像一些压力水平将地下的一部分。< / p > < p >如果我看@位势高度地面或水面。这似乎与地形高程。但我不相信它完全匹配,这正常吗?< a href = " https://i.stack.imgur.com/sE4Gv.png " rel = " nofollow noreferrer " > < img src = " https://i.stack.imgur.com/sE4Gv.png " alt = "在这里输入图像描述" / > < / > < / p > < p >然而,1000 mb的位势,混淆了我:< a href = " https://i.stack.imgur.com/XK0r1.png " rel = " nofollow noreferrer " > < img src = " https://i.stack.imgur.com/XK0r1.png " alt = "在这里输入图像描述" / > < / > < / p > < p >怎么gph@ground一些分更低?我不了解这个数据和如何使用它来找出具体是什么高度高于平均海平面? < / p > //www.hoelymoley.com/questions/23707/-/23708 # 23708 4 答案为如何找到JeopardyTempest风的高度高于平均海平面在如GFS预报数据 JeopardyTempest //www.hoelymoley.com/users/6298 2022 - 04 - 08 - t17:50:59z 2022 - 04 - 08 - t19:34:39z < p >是有道理的,有些地方有一个1000 mb的下表面压力……这意味着到1000 mb你不得不去地下(计算的基本思想是,压力降低大气中当你提升……为了让它从海平面增加压力,你要去另一个方向,地下)。< / p > < p >肯定感觉提示是不现实的…但是我认为如果你挖一个足够深的洞足够宽,你会得到给定的压力。

Here's the sea level pressure map similar to your 1000 mb map:

[1]: https://i.stack.imgur.com/POw1P.png (Source: weathernerds.org)

Those negative height areas indeed match a chain of lows with surface pressure below 1000 mb in the Southern Ocean and a 992 mb low over Europe. So if the station is 992 mb... you'd have to even lower in the atmosphere (= negative) to get to 1000 mb.

This is actually a common interpolation on pressure maps in meteorology... mean sea level pressure itself... probably the most common map we use... is found at a height that is actually below ground at most places, because almost all locations are somewhat above sea level. But by comparing on a flat surface it allows us to better identify the weather-causing features, factoring out the otherwise overwhelming factor of pressure decrease with altitude above sea level (your ears pop on mountains despite being at 0 ft above the ground because the atmospheric pressure is still less because there's less atmosphere above you)

Even at 850 mb, another common geopotential height for analysis... we can plot the heights above sea level... but we often will choose to mask out the model's winds in spots to show the 850 height is truly subterranean there, so the model's predicted winds are of imaginary quality, being below ground level:

enter image description here (From pivotalweather)... the grey is masked out wind.

So all your plots looks quite reasonable, and hopefully that helps make sense of the concept. Not every location has 1000 mb (or even 850 mb) in its atmosphere... both because some sites have sea-level pressures below that value (the cause of the issues on your map, as geopotential is based upon sea-level), and also because the elevation of some sites means lower surface pressure (not the cause of your negative geopotential heights, but the cause of the wind maskout on some such plots as shown).

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