Changes in atmospheric latent energy transport into the Arctic: Planetary versus synoptic scales,Quarterly Journal of the Royal Meteorological Society

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Changes in atmospheric latent energy transport into the Arctic: Planetary versus synoptic scales
Quarterly Journal of the Royal Meteorological Society ( IF 3.0 ) Pub Date : 2021-03-22 , DOI: 10.1002/qj.4022
J.H. Rydsaa ₁ , R.G. Graversen _{1,

2} , T. I. H. Heiskanen ₁ , P. J. Stoll ₁

Affiliation

Atmospheric meridional energy transport into the Arctic plays an important role in Arctic weather and climate. The transport of latent energy in the form of water vapour strongly influences the Arctic atmosphere. The transport is achieved by circulation mechanisms on various scales and is largely comprised of extreme transport events. Here, we use a Fourier-based method of dividing the latent energy transport into spatial scales and investigate the extent to which extreme events in latent energy transport on planetary and synoptic scales have changed over the past four decades, and how they influence the Arctic winter temperatures. We find that wintertime extreme transport events on planetary scales are associated with warm temperature anomalies across the entire Arctic, while the extreme events on synoptic scales have less impact on the Arctic temperatures. We show that over the past four decades, there has been a significant increase in the wintertime latent energy transport by planetary-scale systems, and a decrease in synoptic-scale transport. This shift may have contributed to the amplified warming observed in the Arctic winter over the past decades.

中文翻译：

大气潜在能量传输到北极的变化：行星尺度与天气尺度

进入北极的大气经向能量传输对北极天气和气候起着重要作用。以水蒸气形式传输的潜在能量强烈影响北极大气。运输是通过各种规模的循环机制实现的，主要由极端运输事件组成。在这里，我们使用基于傅立叶的方法将潜在能量传输划分为空间尺度，并调查了过去 40 年行星和天气尺度上潜在能量传输的极端事件发生的变化程度，以及它们如何影响北极冬季温度。我们发现行星尺度上的冬季极端运输事件与整个北极的暖温异常有关，而天气尺度上的极端事件对北极气温的影响较小。我们表明，在过去的四年中，行星尺度系统的冬季潜在能量传输显着增加，天气尺度传输减少。这种转变可能是过去几十年北极冬季观测到的升温加剧的原因。

更新日期：2021-03-22

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