Contribution of the Southern Annular Mode to Variations in Water Isotopes of Daily Precipitation at Dome Fuji, East Antarctica

Contribution of the Southern Annular Mode to Variations in Water Isotopes of Daily Precipitation at Dome Fuji, East Antarctica
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南环模态对南极洲东部圆顶富士日降水水同位素变化的贡献

DOI:
10.1029/2021jd035397
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发表时间:
2021
期刊:
Journal of Geophysical Research: Atmospheres
影响因子:
--
通讯作者:
Yoshimura Kei
Yoshimura Kei
中科院分区:
--
文献类型:
--
作者:
Kino Kanon;Okazaki Atsushi;Cauquoin Alexandre;Yoshimura Kei

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在南极冰芯中测量的水同位素能够重建过去温度变化的第一阶。然而,降水的季节性和偶发事件,包括天气尺度扰动,影响了冰芯中记录的同位素信号。在这项研究中,我们采用了一个同位素启用的大气环流模式,从1981年至2010年,在东南极洲富士圆顶的降水(δ18Op)的气候因素的变化进行了研究。南方环形模态(SAM)是南方中高纬大气环流的主要模态,对同位素信号有重要贡献。正δ 18异常,特别是在南半球冬季,与SAM的负极性有关,它减弱西风,增加向南的水汽通量。南极夏季温度和δ18Opin的日变化都很小,对年信号的贡献有限。SAM驱动的同位素信号是富士穹的位置特征,与大尺度大气模式的非对称成分有关。
Water isotopes measured in Antarctic ice cores enable reconstruction at the first order of the past temperature variations. However, the seasonality of the precipitation and episodic events, including synoptic‐scale disturbances, influence the isotopic signals recorded in ice cores. In this study, we adopted an isotope‐enabled atmospheric general circulation model from 1981 to 2010 to investigate variations in climatic factors in δ18O of precipitation (δ18Op) at Dome Fuji, East Antarctica. The Southern Annular Mode (SAM), the primary mode of atmospheric circulation in the southern midhigh latitudes, significantly contributes to the isotope signals. Positive δ18Opanomalies, especially in the austral winter, are linked to the negative polarity of the SAM, which weakens westerly winds and increases the southward inflow of water vapor flux. Daily variations in temperature and δ18Opin Dome Fuji are significantly small in the austral summer, and their contribution to the annual signals is limited. The isotope signals driven by the SAM are a locational feature of Dome Fuji, related to the asymmetric component of the large‐scale atmospheric pattern.
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