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中国沙漠 ›› 2016, Vol. 36 ›› Issue (2): 491-498.DOI: 10.7522/j.issn.1000-694X.2015.00028

• 天气与气候 • 上一篇    下一篇

乌鲁木齐降水中δ18O的温度和降水强度效应的季节转换

郑新军1,2, 李彦1, 徐利岗1,3   

  1. 1. 中国科学院新疆生态与地理研究所 绿洲与荒漠生态国家重点实验室/新疆阜康荒漠生态国家野外科学观测研究站, 新疆 乌鲁木齐 830011;<2r>2. 中国科学院大学, 北京 100049;<2r>3. 宁夏水利科学研究所, 宁夏 银川 750021
  • 收稿日期:2014-11-10 修回日期:2015-01-14 出版日期:2016-03-20 发布日期:2016-03-20
  • 通讯作者: 李彦,E-mail:liyan@ms.xjb.ac.cn
  • 作者简介:郑新军(1979-),男,博士研究生,助理研究员,主要从事荒漠气象、生态与稳定同位水文学研究.E-mail:zhengxj@ms.xjb.ac.cn
  • 基金资助:
    国家自然科学基金项目(41171049,41371079);中国博士后科学基金项目(2013M542416)

Seasonal Transition between Temperature and Precipitation Intensity Effect on Precipitation δ18O in Urumqi, China

Zheng Xinjun1,2, Li Yan1, Xu Ligang1,3   

  1. 1. State Key Laboratory of Desert and Oasis Ecology/Fukang National Field Station for Desert Ecological Observation and Research, Xinjiang institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China;
    3. Institute of the Water Conservancy of Ningxia, Yinchuan 750021, China
  • Received:2014-11-10 Revised:2015-01-14 Online:2016-03-20 Published:2016-03-20

摘要: 受到温度和降水季节变化的双重影响,温带大陆和季风气候地区降水中的δ18O有很强的季节动态。在中国北方由于受到强烈的温度季节变化的控制,降水中δ18O有很强的温度效应,甚至在月尺度上与温度呈显著的正相关。然而,在降水事件尺度上,特别是多雨的夏季,显著的降水量效应仍然存在。本研究结合气象数据分析了来源于GNIP的乌鲁木齐月尺度上的降水中δ18O与平均气温和降水量之间的关系。结果表明:在年尺度上,保持气温和降水频率不变,扣除两者的影响,δ18O与降水强度有显著的负相关关系(P=0.012)。温度和降水强度效应分别为(0.45±0.03)‰·℃-1(T=17.38,P<0.001)和(-0.28±0.12)‰·mm-1(T=-2.29,P=0.023)。温度和降水效应在一年四季均存在,且两者存在季节转化,分别主导了一年中不同季节降水中δ18O的动态变化。在气温剧烈变动的春季(3-5月)和秋季(9-11月),显著的温度效应占主导。而在夏季(6-8月),显著的降水强度效应(T=-2.93,P=0.006)主导了降水中δ18O的动态。尽管在冬季(12月至翌年2月)降水强度效应和温度效应很微弱也不显著,但是前者仍然大于后者。

关键词: 季节波动, 温度效应, 降水强度效应, δ18O

Abstract: Because of the temperature and precipitation impact, there is an intensive seasonal varying of precipitation δ18O under the temperate continental and monsoon climate in the most of China. In northern part of China, predominant by the fluctuant air temperature, precipitation δ18O has a strong temperature effect, and even on the monthly scale there is a significant positive correlation with precipitation amount. However, recently, several studies showed that there was also a significant or insignificant precipitation amount effect on the precipitation event scale especially for the rainy summer season. In this study, precipitation δ18O downloaded from GNIP with monthly meteorological data was reanalyzed. The result showed that when the variation of air temperature and precipitation frequency were sorted out to remove their influence, there was a significant negative correlation between precipitation intensity on the monthly scale all year round (P=0.012). The significant temperature and precipitation intensive effect yearly were (0.45±0.03)‰\5℃-1 (T=17.38, P<0.001) and (-0.28±0.12)‰·mm-1 (T=-2.29, P=0.023), respectively. In the four seasons, temperature and precipitation intensive effect all coexisted, and they shifted and dominated the fluctuation of precipitation δ18O in different seasons, respectively. In spring and autumn, it was predominated by the significant temperature effect because of the strong fluctuation in air temperature. In hot summer, it was predominated by the significant precipitation intensity effect of (-0.49±0.17)‰·mm-1 (T=-2.93, P=0.006). Although in cold winter, the temperature and precipitation intensity effect were both insignificant, the latter also was larger than the former.

Key words: seasonal fluctuation, temperature effect, precipitation intensity effect, δ18O

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