Abstract
The link between boreal winter cooling over the midlatitudes of Asia and the Barents Oscillation (BO) since the late 1980s is discussed in this study, based on five datasets. Results indicate that there is a large-scale boreal winter cooling during 1990–2015 over the Asian midlatitudes, and that it is a part of the decadal oscillations of long-term surface air temperature (SAT) anomalies. The SAT anomalies over the Asian midlatitudes are significantly correlated with the BO in boreal winter. When the BO is in its positive phase, anomalously high sea level pressure over the Barents region, with a clockwise wind anomaly, causes cold air from the high latitudes to move over the midlatitudes of Asia, resulting in anomalous cold conditions in that region. Therefore, the recent increasing trend of the BO has contributed to recent winter cooling over the Asian midlatitudes.
摘要
本文基于5种数据集, 分析研究了20世纪80年代末以来欧亚大陆中纬度地区冬季变冷与巴伦支震荡的关系. 分析结果显示, 1990–2015年间欧亚大陆中纬度地区的冬季表层气温存在大范围的变冷趋势, 这种变冷趋势属于该地区表层气温年代际震荡的一部分, 进一步研究表明该地区冬季表层气温异常与巴伦支震荡存在显著的相关关系, 当巴伦支震荡处于正位相时, 在巴伦支地区高压异常, 存在顺时针方向的风场异常, 异常风场会给欧亚大陆中纬度地区带来异常的冷空气, 使该地区降温. 近期巴伦支震荡存在增强的趋势, 这会导致欧亚大陆中纬度地区的冬季变冷.
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Acknowledgements
The HadCRUT4 data are from http://www.metoffice.gov.uk/hadobs/hadcrut4/; the NCEP–NCAR Reanalysis and 20CR data are available from http://www.esrl.noaa.gov/psd/data/gridded/; and the ERA-Interim and ERA-20C data are from http://apps.ecmwf.int/datasets/. The authors are thankful to these data providers. This work is supported by the Project of Comprehensive Evaluation of Polar Areas on Global and Regional Climate Changes (Grant No. CHINARE04-04), the National Natural Science Foundation of China (Grant No. 41406027), and the NSFCShandong Joint Fund for Marine Science Research Centers (Grant No. U1406404).
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Shu, Q., Qiao, F., Song, Z. et al. Link between the Barents Oscillation and recent boreal winter cooling over the Asian midlatitudes. Adv. Atmos. Sci. 35, 127–132 (2018). https://doi.org/10.1007/s00376-017-7021-6
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DOI: https://doi.org/10.1007/s00376-017-7021-6