为什么压力两极冬天夏天更高和更低的吗?- 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 - 10 - t13:16:59z //www.hoelymoley.com/feeds/question/19471 https://creativecommons.org/licenses/by-sa/4.0/rdf //www.hoelymoley.com/q/19471 3 为什么压力两极冬天夏天更高和更低的吗? 阿曼 //www.hoelymoley.com/users/19151 2020 - 03 - 18 - t11:11:19z 2020 - 04 - 29 - t16:23:43z < p >给上下文,这并不是我最初的问题但我最终坚持在试图找到一个原因以下观察(这是普遍适用于温带气候):< / p > < p >在各自大陆的西海岸的地方往往有更高的降水在冬季,而东海岸的大洲有更高的地方在夏季降水< / p > < p >看到这个视图下面的地图< a href = " http://www.city-data.com/forum/weather/2895681-driest-wettest-months-year-world-maps.html " rel = " nofollow noreferrer " > http://www.city-data.com/forum/weather/2895681-driest-wettest-months-year-world-maps.html < / > < / p > < p >如果该地区30度至60度下来自赤道是西风带的影响,这是相关的地区被认为是在地图上。< / p > < p >查看几这种现象的例子,看到降水模式在< / p > < p > < a href = " https://en.wikipedia.org/wiki/San_Francisco #气候”rel = " nofollow noreferrer " > https://en.wikipedia.org/wiki/San_Francisco气候< / > < / p > < p > < a href = " https://en.wikipedia.org/wiki/Rabat #气候”rel = " nofollow noreferrer " > https://en.wikipedia.org/wiki/Rabat气候< / > < / p > < p >与< / p > < p > < a href = " https://en.wikipedia.org/wiki/Tallahassee _Florida #气候”rel = " nofollow noreferrer " > https://en.wikipedia.org/wiki/Tallahassee _Florida #气候< / > < / p > < p > < a href = " https://en.wikipedia.org/wiki/Shanghai #气候”rel = " nofollow noreferrer " > https://en.wikipedia.org/wiki/Shanghai气候< / > < / p > < p >潮湿空气的流动是降水的主要决定因素。由于科里奥利力,空气在北半球顺时针移动,在南半球,空气逆时针移动。< / p > < p >为主要盛行风造成降雨西海岸的大洲是来自西方,它一定是向极移动,然后弯曲东由于科里奥利力(西风)< / p > < p >因此,一定有一些原因西风带冬天更强。我能想到的唯一可能的解释是,波兰人更高的压力在夏天冬天(导致pleward西风带弱)和低(引起更强的向极西风带)< / p > < p >这一说法实际上是真实的,是被维基百科。< / p >

https://en.wikipedia.org/wiki/Westerlies This page states that the pressure over the poles is lower during Winter causing stronger Westerlies:

"The westerlies are strongest in the winter hemisphere and times when the pressure is lower over the poles, while they are weakest in the summer hemisphere and when pressures are higher over the poles."

On the same wikipedia page, it states the claim I am asking an explanation for: " This occurs when the Arctic oscillation is positive, and during winter low pressure near the poles is stronger than it would be during the summer

I would like an explanation of this phenomenon, ideally explaining why the polar pressure varies to such an extent...

Also, I would like to know if the logic I have used to reach these conclusion is valid

 //www.hoelymoley.com/questions/19471/-/19651 # 19651 4 答案由Joscha Fregin为什么夏天是两极的压力更高和更低的冬天吗? Joscha Fregin //www.hoelymoley.com/users/18833 2020 - 04 - 29 - t16:23:43z 2020 - 04 - 29 - t16:23:43z < p >我的答案只会涉及的问题标题:为什么压力两极冬天夏天更高和更低的吗?< / p > < p >由于地球的轴线倾斜冬季半球被太阳辐射减少加热。这导致一个高温度梯度从赤道到冬季半球杆(强斜压性)。相比之下我们有一个低温度梯度从赤道到夏天半球。失踪的太阳能加热在冬季半球另外导致下行空气导致钢管<强> < /强>射流压力水平低(大约300 hPa)。非旋转的星球上的空气当然会直接从高压流(赤道)低压(杆)来消除压力梯度。就像温暖的空气流向极清冷的空气,这也削弱了温度梯度。但由于地球旋转,周围的空气流动低压的面积。这个流不断强经向温度梯度增强。< / p > < p >这可能从热风平衡,这告诉我们,地转风类< span = " math-container " > V_g < / span >美元与温度梯度类< span = " math-container " > \微分算符T < / span >美元,美元<跨类= " math-container " > \压裂{\部分V_g}{\部分\ ln p} = - \压裂{R} {f} k \ \微分算符台币< / span >。这里< span class = " math-container " > $ p $ < / span >是压力,< span class = " math-container " > R < / span >美元是干空气的气体常数,< span class = " math-container " > $ f $ < / span >是科里奥利参数和类< span = " math-container " > k < / span >美元是垂直的单位向量。 Assuming there is no zonal temperature gradient, we can conclude that a strong meridional temperature gradient leads to an increasing change of $V_g$ with height. We can observe this strong wind as the strong/weak jet stream in the winter/summer hemisphere. What does all of this have to with the pressure?

The jet stream acts as a barrier, dividing the warm and cold air masses. The Temperature will keep getting lower which will also increase the pressure and temperature gradient. In return the barrier (jet stream) gets stronger. This positive feedback mechanism remains until after winter solstice. Then the radiation reaching the pole will increase again, warming the air masses. Which will then lead to a weakening of the gradients.

So summarizing the above one could say, the missing radiation cools the air leading to a low pressure system at jet stream level. The jet stream itself gets stronger as the temperature gradient increases and acts as a barrier for warm and cold air masses and therefore maintains the pressure difference.

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