Long-term trends and impacts of polar cold airmass in boreal summer
Long-term trends and impacts of polar cold airmass in boreal summer
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北半球夏季极地冷气团的长期趋势和影响
DOI：
10.1088/1748-9326/ab986d
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发表时间：
2020-08
影响因子：
6.7
通讯作者：
Toshiki Iwasaki
中科院分区：
文献类型：
--
作者：
Liu Qian;Chen Guixing;Toshiki Iwasaki
北方极区是北方半球冷气团分布最广的地区。这种极地冷气团的产生及其向低纬度地区的外流在气候系统的质量和热量交换方面发挥着重要作用。然而，极地冷气团的长期变化，特别是夏季的变化，以及对中高纬度地区的气候影响仍然不清楚。利用等熵方法，我们定量地表明，自20世纪80年代以来，极地冷气团的数量迅速减少，与全球变暖滞后了10年。冷空气团的赤道通量也减弱了，将冷空气团困在其源区。冷气团的这些深刻变化与近30年来中高纬度大陆表面迅速变暖和热浪日益频繁的时期相吻合。由于冷气团减少的区域差异，欧洲和北美经历了比北方半球平均更快的地表变暖。此外，极地冷气团的这种长期趋势可归因于北极海冰的减少和高纬度海洋海面温度的内部十年变化。结果表明，冷空气等熵分析可以很好地反映极地和中高纬地区的气候变化。
The northern polar region possesses the most extensive cold airmass on Northern Hemisphere. The generation of this polar cold airmass and its outflow to lower latitudes play an important role in the climate system in terms of mass and heat exchanges. However, long-term changes in the polar cold airmass, especially in summer, and the climatic effects on mid-high latitudes are still unclear. Using an isentropic approach, we quantitatively show that the polar cold airmass amount has decreased rapidly since the 1980s, with a decade lagging behind the global warming. The equatorward flux of the cold airmass has also weakened, trapping the cold airmass in its source region. These profound changes in the cold airmass coincide with a period characterized by rapid surface warming and increasingly frequent heat waves in recent three decades over the mid-high latitude continents. Owing to regional differences in the cold airmass reduction, Europe and North America have experienced a surface warming faster than the Northern Hemisphere mean. Furthermore, such a long-term trend in the polar cold airmass can be attributed to Arctic sea ice loss and internal decadal variability of sea surface temperature in high-latitude oceans. Our results highlight that the isentropic analysis of cold airmass may serve a good detection of the climate change at polar region and mid-high latitudes.
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DOI：
--
发表时间：
2016
期刊：
--
影响因子：
--
作者：
D. Wuebbles;D. Easterling;K. Hayhoe;T. Knutson;Robert E Kopp;J. Kossin;K. Kunkel;A. Legrande;
通讯作者：
D. Wuebbles;D. Easterling;K. Hayhoe;T. Knutson;Robert E Kopp;J. Kossin;K. Kunkel;A. Legrande;
中国昼夜温差的变化和趋势及其与总云量和日照时数的关系
影响因子：
1.9
作者：
Xia X.
通讯作者：
Xia X.
影响因子：
3.5
作者：
P. Shukla;J. Skeg;E. Buend́ıa;V. Masson‐Delmotte;H. Pörtner;D. Roberts;P. Zhai;R. Slade;
通讯作者：
P. Shukla;J. Skeg;E. Buend́ıa;V. Masson‐Delmotte;H. Pörtner;D. Roberts;P. Zhai;R. Slade;
影响因子：
5.2
作者：
Scheff, Jack;Frierson, Dargan M. W.
通讯作者：
Frierson, Dargan M. W.
影响因子：
3.1
作者：
J. Angell
通讯作者：
J. Angell