台风论坛

 找回密码
 立即注册
搜索
热搜: 台风
123
返回列表 发新帖
楼主: invensys

[气候监测] 平流层突然变暖(SSW)事件

[复制链接]

1113

主题

1万

帖子

3万

积分

荣誉会员-暖池

积分
37405

风语者

 楼主| 发表于 2019-1-12 15:16 | 显示全部楼层
3.jpg

据英国气象局2019年1月11日报道,在今年冬天偶尔发生寒冷袭击之后,现在有迹象表明,由于突然的平流层变暖(SSW)引起的寒冷冬季天气正在为进入英国。

突然的平流层变暖于2018年12月22日左右开始,北极上方约30公里的风在元旦周围从西风转向东风。

SSW的影响现在已经通过平流层向下传播,导致主要的平流层极涡分裂并转移到横跨大西洋和北半球欧洲部分的中纬度地区,这是您可能期望的典型模式在春天看。

对于最近突然的平流层变暖的影响可能从平流层传播到对流层的速度有多快,以及这次变暖事件对英国天气状况的影响仍存在不确定性。

“最新预测显示,任何严重冬季天气的风险最高的是从1月下旬到2月。无论是来自北方的北极空气还是来自大陆的东风流动都会产生寒冷天气仍然不确定,”副首席气象学家说。
NASA. NOAA. USGS. NSIDC. ESA. National Geographic. Discovery.
回复

使用道具 举报

1113

主题

1万

帖子

3万

积分

荣誉会员-暖池

积分
37405

风语者

 楼主| 发表于 2019-1-14 17:41 | 显示全部楼层
4.jpg



在过去的10天里,由于北极空气和暴风雪席卷整个欧洲大陆,至少有26人在与天气有关的事件中丧生。然而,这不是结束,因为另一场北极寒潮将在下周初再席卷中东欧。


1.png

2.png

4.png

5.png
NASA. NOAA. USGS. NSIDC. ESA. National Geographic. Discovery.
回复

使用道具 举报

1113

主题

1万

帖子

3万

积分

荣誉会员-暖池

积分
37405

风语者

 楼主| 发表于 2019-1-14 18:44 | 显示全部楼层
4.jpg


Gezoyze国家公园的冰雪覆盖的房子(施蒂利亚州,奥地利,01/13/2019)
NASA. NOAA. USGS. NSIDC. ESA. National Geographic. Discovery.
回复

使用道具 举报

1113

主题

1万

帖子

3万

积分

荣誉会员-暖池

积分
37405

风语者

 楼主| 发表于 2019-1-17 12:11 | 显示全部楼层
4.jpg


奥地利埃本塞社区被白雪覆盖的屋顶,1月16日
NASA. NOAA. USGS. NSIDC. ESA. National Geographic. Discovery.
回复

使用道具 举报

1113

主题

1万

帖子

3万

积分

荣誉会员-暖池

积分
37405

风语者

 楼主| 发表于 2019-2-19 19:10 | 显示全部楼层
1.jpg


路灯灯笼照亮了雪(公社蒂涅,阿尔卑斯山,法国,2018年1月)
NASA. NOAA. USGS. NSIDC. ESA. National Geographic. Discovery.
回复

使用道具 举报

1113

主题

1万

帖子

3万

积分

荣誉会员-暖池

积分
37405

风语者

 楼主| 发表于 2019-8-23 10:45 | 显示全部楼层

南半球罕见天气现象 - 平流层突然变暖

本帖最后由 invensys 于 2019-8-23 11:53 编辑

1.jpg
Rare weather phenomenon amassing in southern hemisphere - Sudden Stratospheric Warming (SSW)

A rare weather phenomenon for the southern hemisphere - Sudden Stratospheric Warming (SSW) - is amassing in the polar stratosphere. This may lead to unusual or extreme weather in parts of the southern hemisphere (potentially New Zealand) during September and October 2019. SSWs are much more common in the northern hemisphere. You are probably familiar with a major northern hemisphere's SSW event of February 2018 - dubbed the 'Beast from the East' - and odds are you'll be seeing many international headlines with 'September to Remember' in the days and weeks ahead.

SSW occurs when the temperature of the stratosphere (30 - 50 km / 18 - 31 miles above ground) over the South Pole rises by more than 25 °C (45 °F) and NIWA meteorologist Ben Noll says this looks likely to occur next week.

Such events are rare in the southern hemisphere, with only two in New Zealand in recorded times - one in September 202 and the other in September 2010, NIWA reports. After the SSW in 2002, New Zealand experienced its coldest October in 20 years with below-average temperatures covering much of the country and frequent ground frosts. In 2010 – which is classed as a minor event – a number of rainfall records were broken with well below normal sunshine and very cold temperatures in parts of the South Island.

The SSW is likely to peak between Thursday, August 29 and Monday, September 2.

"For up to about a month after the SSW, polar air masses, known as streamers, can break off from the weakened vortex and move towards New Zealand. It doesn’t guarantee unusual or extreme weather, but it can happen," Noll says.
回复

使用道具 举报

1113

主题

1万

帖子

3万

积分

荣誉会员-暖池

积分
37405

风语者

 楼主| 发表于 2019-9-14 10:59 | 显示全部楼层
1.jpg
Very rare Sudden Stratospheric Warming (SSW) event continues unfolding above the South Pole.
This SSW could go down in history as the strongest warming event on record, NIWA said, adding there is increased risk for southerlies in New Zealand into October.
SSW events are rare in the southern hemisphere, with only two in New Zealand in recorded times - one in September 2002 and the other in September 2010
The Australian Bureau of Meteorology is also predicting it as the strongest Antarctic warming on record, likely to exceed the previous record of September 2002 when New Zealand experienced its coldest October in 20 years.
Below-average temperatures covered much of the country in 2002, resulting in frequent ground frosts.
In 2010 SSW event – which is classed as a minor event – a number of rainfall records were broken with well below normal sunshine and very cold temperatures in parts of the South Island.

1.gif

"Although we have seen plenty of weak or moderate variations in the polar vortex over the past 60 years, the only other true sudden stratospheric warming event in the Southern Hemisphere was in September 2002," BOM meteorologists said.
"Impacts from this stratospheric warming are likely to reach Earth’s surface in the next month and possibly extend through to January. Apart from warming the Antarctic region, the most notable effect will be a shift of the Southern Ocean westerly winds towards the Equator.
"For regions directly in the path of the strongest westerlies, which includes western Tasmania, New Zealand’s South Island, and Patagonia in South America, this generally results in more storminess and rainfall, and colder temperatures. But for subtropical Australia, which largely sits north of the main belt of westerlies, the shift results in reduced rainfall, clearer skies, and warmer temperatures.
"Past stratospheric warming events and associated wind changes have had their strongest effects in NSW and southern Queensland, where springtime temperatures increased, rainfall decreased and heatwaves and fire risk rose."





回复

使用道具 举报

您需要登录后才可以回帖 登录 | 立即注册

本版积分规则

Archiver|手机版|小黑屋|台风论坛 ( 沪ICP备11041484号-3 )

GMT+8, 2019-9-16 22:09

Powered by Discuz! X3.4 Licensed

© 2001-2017 Comsenz Inc.

快速回复 返回顶部 返回列表