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The Intraseasonal and Interannual Variability of Arctic Temperature and Specific Humidity Inversions

1
SOA Key Laboratory for Polar Science, Polar Research Institute of China, Shanghai 200136, China
2
Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, School of Atmospheric Sciences, Sun Yat-sen University, Zhuhai 519082, China
3
Southern Marine Science and Engineering Guangdong Laboratory, Zhuhai 519082, China
4
National Marine Environmental Forecasting Center, Beijing 100081, China
5
Department of Atmospheric Sciences, University of Arizona, Tucson, AZ 85721, USA
6
National Center for Atmospheric Research, Boulder, CO 80305, USA
*
Author to whom correspondence should be addressed.
Atmosphere 2019, 10(4), 214; https://doi.org/10.3390/atmos10040214
Received: 1 April 2019 / Revised: 12 April 2019 / Accepted: 19 April 2019 / Published: 22 April 2019
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Abstract

Temperature and humidity inversions are common in the Arctic’s lower troposphere, and are a crucial component of the Arctic’s climate system. In this study, we quantify the intraseasonal oscillation of Arctic temperature and specific humidity inversions and investigate its interannual variability using data from the Surface Heat Balance of the Arctic (SHEBA) experiment from October 1997 to September 1998 and the European Centre for Medium-Range Forecasts (ECMWF) Reanalysis (ERA)-interim for the 1979–2017 period. In January 1998, there were two noticeable elevated inversions and one surface inversion. The transitions between elevated and surface-based inversions were associated with the intraseasonal variability of the temperature and humidity differences between 850 and 950 hPa. The self-organizing map (SOM) technique is utilized to obtain the main modes of surface and elevated temperature and humidity inversions on intraseasonal time scales. Low (high) pressure and more (less) cloud cover are related to elevated (surface) temperature and humidity inversions. The frequency of strong (weak) elevated inversions over the eastern hemisphere has decreased (increased) in the past three decades. The wintertime Arctic Oscillation (AO) and Arctic Dipole (AD) during their positive phases have a significant effect on the occurrence of surface and elevated inversions for two Nodes only. View Full-Text
Keywords: Arctic; surface inversions; elevated inversions; intraseasonal variability; Arctic Oscillation (AO); Arctic Dipole (AD) Arctic; surface inversions; elevated inversions; intraseasonal variability; Arctic Oscillation (AO); Arctic Dipole (AD)
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Yu, L.; Yang, Q.; Zhou, M.; Zeng, X.; Lenschow, D.H.; Wang, X.; Han, B. The Intraseasonal and Interannual Variability of Arctic Temperature and Specific Humidity Inversions. Atmosphere 2019, 10, 214.

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