今年的平均最冷一天怎么能在冬至前?- 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 - 08 - 16 - t11:29:50z //www.hoelymoley.com/feeds/question/3193 https://creativecommons.org/licenses/by-sa/4.0/rdf //www.hoelymoley.com/q/3193 23 今年的平均最冷一天怎么能在冬至前? ruakh //www.hoelymoley.com/users/1406 2015 - 01 - 04 - t20:49:20z 2015 - 02年- 18 - t18:26:04z < p >有美国的部分地区,平均而言,12月21日之前,是今年最冷的一天。(< a href = " http://www.ncdc.noaa.gov/news/when-to-expect-coldest-day-of-year " rel = " noreferrer " > < / >来源]< / p > < p > < img src = " https://i.stack.imgur.com/jb44J.jpg " alt = "今年最冷的一天" > < / p > < p >这怎么可能?为什么温度再次上升尽管天仍在增长短?< / p > < p >(我认为每天的温度,一般来说,总是落后于日常日晒,与某种< a href = " http://en.wikipedia.org/wiki/Hysteresis " rel = " noreferrer " >滞后< / >关系。)< / p > //www.hoelymoley.com/questions/3193/-/4207 # 4207 3 user824回答的平均今年最冷的一天怎么能在冬至前? user824 //www.hoelymoley.com/users/0 2015 - 01 - 07 - t19:14:19z 2015 - 01 - 07 - t19:14:19z < p >气候是一个非常复杂的问题,不是我的专业领域,但有一些东西需要考虑。你只是看着北半球的一个小子集,你必须考虑天气随季节变化模式。< / p > < p >你会注意到,西方国家早些时候显示冷时期的地图。我怀疑这是主要影响天气的变化随着太平洋冬季模式发展的方法。太平洋温度变化不多,当冬天接近空气和水之间的温差也更明显。这将导致增加更强(深层)低压细胞在太平洋。随着冬天降临这些风暴继续发展,并通过在大陆有效转移更多的热量从太平洋到大陆。大气和海洋之间的温差增加这些冬季风暴变得更强。在我住的地区(温哥华岛)12月往往很冷,因为北极高位的影响我们的天气冬天但是一旦建立了我们经常有很多的云层,温暖的天气,下雨了。有时候我们从夏威夷非常温暖的天气,这叫做菠萝快车< a href = " http://en.wikipedia.org/wiki/Pineapple_Express " rel =“nofollow”> http://en.wikipedia.org/wiki/Pineapple_Express。< / > < / p > < p >总之我怀疑天气模式你观察到主要是由气候模式的变化造成太平洋的普遍降低大气温度在北半球。< / p > //www.hoelymoley.com/questions/3193/-/4421 # 4421 9 凯西回答的平均今年最冷的一天怎么能在冬至前? 凯西 //www.hoelymoley.com/users/64 2015 - 02年- 17 - t21:32:54z 2015 - 02年- 18 - t18:26:04z < p >我已经创建了复合地块从再分析数据的日期作为图像分割的问题。我使用完整的< a href = " http://www.esrl.noaa.gov/psd/data/gridded/data.narr.html " rel = " nofollow noreferrer " > NARR < / >数据集,涵盖了1979年到2014年,所以我有几年比上图中包含的数据。< / p > < p >在很大程度上可以看到冬季气候意味着什么。持久的副热带高压在加州海岸和持续低位在北太平洋和大西洋。变化是什么意思的北极空气陷入美国像春天冬天进展和撤退的方法。< / p > < h3 >复合NARR MSLP 1979 - 2014和500 - 1000 hPa厚度< / h3 > < p > < a href = " https://i.stack.imgur.com/5jWto.jpg " rel = " nofollow noreferrer " > < img src = " https://i.stack.imgur.com/5jWto.jpg " alt = "在这里输入图像描述" > < / > < img src = " https://i.stack.imgur.com/CCPVI.png " alt = "在这里输入图像描述" > < / p > < p > <子> <强>图1 < /强>。从左到右,从上到下的日期合成是< em > 12月1 - 15、16 - 20、21 - 25日,26-31,Jan 1 - 5 6 - 10, 11 - 15号,16 - 20、21 - 25日,26-31,2月1 - 15,16-28、3月1 - 15和16-31 < / em >。每4 hPa MSLP是波状外形的。厚度是阴影每隔10 dm。点击大图的阴谋。< /订阅> < / p > < p >信号我可以挑出这是接近,撤退冷(使用代理1000 - 500 mb的厚度),似乎与相关的最新日期冷在美国东部,尤其是在五大湖和东北部。

What I'm seeing in the west is that initially the subtropical high is broad and surface flowing westerlies impinging on the west coast would originate initially at higher latitudes than the do later in the winter. By January the subtropical high and the low in the north Pacific have re-oriented so the surface flow is coming from around Hawaii. The western US will also be subject the reduced seasonal temperature fluctuates from its proximity to the Pacific. Once the area has cooled and equilibrated with the Pacific, temperatures will be stable. As the continental landmass would lose more energy and cool, the westerlies coming off the Pacific (now relatively warm) counteract this tendency. Conversely the east with mostly continental air flows experiences large seasonality and has a long-lasted source of very cold air from our neighbors to the north.

Summary

The west ceases to cool once it equilibrates with the Pacific, which looks like it happens early in winter (because even though the Pacific is cold, it isn't that cold). Westerlies from the ocean heep the west warm. East of the rockies there is no influence from large bodies of water and a constant source of cold arctic air and so the east continues to cool throughout the winter, until the pattern changes toward spring (and all the snow melts...).

For a smaller scale example of how water can have this influence, take a look at during the next extreme cold event in the midwest and great lakes, particularly when air is flowing westerly across Wisconsin and into Michigan. You will observe a large temperature gradient across Lake Michigan, which keeps Michigan warmer (sometimes much warmer) than Wisconsin. Later in the winter when the lake is frozen, that benefit is lost and so Michigan tends to be cooler later in winter as it is no longer "shielded" by the lakes.

Data

Data was downloaded from NOAA's North American Regional Reanalysis, accessed 17 Feb 2015. Files accessed include:

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