Trends and variability in polar sea ice, global atmospheric circulations, and baroclinicity,Annals of the New York Academy of Sciences

当前位置： X-MOL 学术 › Ann. N. Y. Acad. Sci. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Trends and variability in polar sea ice, global atmospheric circulations, and baroclinicity
Annals of the New York Academy of Sciences ( IF 4.1 ) Pub Date : 2021-07-27 , DOI: 10.1111/nyas.14673
Ian Simmonds ₁ , Muyuan Li _{1,

2,

3}

Affiliation

We analyze the polar sea ice distribution and the global sea level pressure (SLP) and baroclinicity distributions over the “satellite” period of 1979–2020. In the Arctic, there are statistically significant sea ice extent (SIE) decreases in all calendar months, and the annual mean has lost 2.22 million km² over the four decades. The Antarctic SIE, in marked contrast, increased up to 2014, then commenced a remarkable retreat (the annual mean ice extent decreased by 2.03 million km² in the 3 years to 2017), and subsequently increased to near its long-term average value in 2020. The shifts in seasonal-mean SLP patterns are consistent with a warming planet. At the synoptic scale, we diagnose the changes in the baroclinicity, the mechanism by which cyclones, fronts, and other weather systems are generated. Through a novel presentation, we give an overview of the relative roles of changes in the vertical shear and static stability in influencing the global trends in baroclinicity. In both the Arctic and Antarctic regions, baroclinicity is shown to have increased in each season (with the sole exception of the Arctic in summer). This increase, coupled with midlatitude decreases in baroclinicity, results in poleward shifts of the storm tracks.

中文翻译：

极地海冰、全球大气环流和斜压的趋势和变化

我们分析了 1979-2020 年“卫星”时期的极地海冰分布和全球海平面压力 (SLP) 和斜压分布。在北极，所有日历月的海冰范围 (SIE) 在统计上都有显着的减少，并且在过去的 40 年里，年平均减少了 222 万公里²。与此形成鲜明对比的是，到 2014 年南极 SIE 增加，然后开始显着后退（年平均冰面积减少 203 万公里²到 2017 年的 3 年），随后在 2020 年增加到接近其长期平均值。季节性平均 SLP 模式的变化与地球变暖一致。在天气尺度上，我们诊断斜压的变化，这是气旋、锋面和其他天气系统产生的机制。通过一个新颖的介绍，我们概述了垂直剪切和静态稳定性的变化在影响全球斜压趋势方面的相对作用。在北极和南极地区，每个季节的斜压都在增加（除了夏季的北极地区）。这种增加，加上中纬度的斜压降低，导致风暴轨迹向极地移动。

更新日期：2021-07-27

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11