Sciences in Cold and Arid Regions ›› 2016, Vol. 8 ›› Issue (5): 367-377.doi: 10.3724/SP.J.1226.2016.00367

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Atmospheric insight to climatic signals of δ18O in a Laohugou ice core in the northeastern Tibetan Plateau during 1960-2006

WenTao Du1,3, ShiChang Kang1,2, Xiang Qin1, XiaoQing Cui1, WeiJun Sun4   

  1. 1. Qilian Shan Station of Glaciology and Ecologic Environment, State Key Laboratory of Cryospheric Sciences, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;
    2. CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing 100101, China;
    3. University of Chinese Academy of Sciences, Beijing 100049, China;
    4. College of Population, Resources and Environment, Shandong Normal University, Jinan, Shandong 250014, China
  • Received:2016-06-10 Revised:2016-08-17 Published:2018-11-23
  • Contact: ShiChang Kang, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences. No. 320, West Donggang Road, Lanzhou, Gansu 730000, China.
  • Supported by:
    This study was supported by the Global Change Research Program of China (No. 2013CBA01801) and the Natural Science Foundation of China (Nos. 41225002, 41371091, and 41121001).

Abstract: Ice documentation and response to prominent warming, especially after the 1990s, is further investigated because it is concerned whether ice records have absence. A δ18O series of a Laohugou (LHG) shallow ice core (20.12 m) in the northeastern Tibetan Plateau was reconstructed covering the period of 1960-2006. The ice core δ18O record had significant positive correlations with the warm season (May-September) air temperatures at adjacent meteorological stations and the 500 hPa temperatures in boreal China, indicating that the δ18O record could be considered a credible proxy of regional temperature. A clear, cold temperature event in 1967 and rapid warming after the 1990s were captured in the LHG δ18O series, revealing that it could record extreme air-temperature events on both regional and global scales. The LHG δ18O variations had evident positive correlations with both the summer surface outgoing longwave radiation (OLR) in the Mongolia region and the summer meridional wind at 500 hPa in the LHG region during 1960-2006, suggesting that the increased OLR in the Mongolia region might have intensified the Mongolia Low and expanded the pressure gradient to the LHG region (the Shulehe High), which would have pushed the westerlies further north and suppressed southward incursions of cold air into the LHG region, and thus augmented the temperature rise. The regional atmospheric circulation difference (1985-2006 minus 1960-1984) suggested that the anticyclone in the Mongolia region might have developed the easterly wind, which transported warmer air from the east toward the LHG region and weakened the cold penetration of the westerlies, resulting in the temperature rise since the middle 1980s.

Key words: δ18O variations, ice core, outgoing longwave radiation, meridional wind, northeastern Tibetan Plateau

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