干旱气象

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基于GCM的乌鲁木齐水汽稳定同位素变化特征及其与ENSO的关系

石梦雨1,2[Author]) AND 1[Journal]) AND year[Order])" target="_blank">2王圣杰1,2[Author]) AND 1[Journal]) AND year[Order])" target="_blank">2,3姚俊强1王高飞4,张明军2[Author]) AND 1[Journal]) AND year[Order])" target="_blank">2   

  1. 1.中国气象局乌鲁木齐沙漠气象研究所,新疆乌鲁木齐830002;
    2.西北师范大学地理与环境科学学院,甘肃兰州730070;
    3.中国科学院西北生态环境资源研究院冰冻圈科学国家重点实验室,
    甘肃兰州730000;4.新疆阿勒泰地区气象局,新疆阿勒泰836500
  • 出版日期:2018-12-31 发布日期:2018-12-31
  • 通讯作者: 王圣杰(1987— ),汉族,副教授,主要从事同位素水文学研究. E-mail: geowang@126.com。
  • 作者简介:石梦雨(1994— ),女,汉族,硕士研究生,主要从事寒旱区生态水文过程研究. E-mail: rainregen@163.com。

Variation of Stable Isotope in Water Vapor over Urumqi and Its Relationship
 with ENSO Based on Isotope-enabled GCMs

SHI Mengyu1,2[Author]) AND 1[Journal]) AND year[Order])" target="_blank">2, WANG Shengjie1,2[Author]) AND 1[Journal]) AND year[Order])" target="_blank">2,3, YAO Junqiang1,
 WANG Gaofei4, ZHANG Mingjun2[Author]) AND 1[Journal]) AND year[Order])" target="_blank">2   

  1. 1. Institute of Desert Meteorology, China Meteorological Administration, Urumqi 830002, China;
    2. College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China;
    3. State Key Laboratory of Cryospheric Sciences, Northwest Institute of Eco-Environment and
     Resources, Chinese Academy of Sciences, Lanzhou 730000, China;
    4. Altay Meteorological Bureau of Xinjiang, Altay 836500, Xinjiang, China
  • Online:2018-12-31 Published:2018-12-31

摘要:

利用第二稳定水同位素比较小组(SWING2)提供的同位素大气环流模式(GCM)的模拟数据(HadAM3、LMDZ-free和LMDZ-nudge),以新疆乌鲁木齐为例,对比分析了该区域大气水汽中稳定同位素垂直剖面的季节变化,分析了同位素比率与气象要素之间的关系以及ENSO对大气水汽稳定同位素的影响。结果表明:各模拟结果中大气水汽中δ18O在季节变化上均表现为7月较高,1月较低;在垂直层面上,δ18O随气压的降低而逐渐减小。降水和水汽中δ18O的季节变化趋势一致,但由于瑞利分馏的影响,降水中δ18O比水汽中δ18O更富集。在垂直层面上,大气水汽中δ18O与温度呈正相关,与纬向风和经向风的相关性较小,降水中δ18O与纬向风和经向风的相关性也较小。在厄尔尼诺年,δ18O与SST呈负相关,在拉尼娜年则呈正相关,大气环流异常使研究区气温和降水发生变化,进一步也会影响水汽中的同位素值,ENSO一定程度上对研究区水汽同位素的变化产生影响。

关键词: 水汽同位素, GCM, ENSO, 乌鲁木齐

Abstract:

Based on the simulations of isotope-enabled GCMs (HadAM3, LMDZ-free and LMDZ-nudge) compiled by the SWING2 (Stable Water Isotope Intercomparison Group, Phase 2), the stable isotope of water vapor in Urumqi of Xinjiang was focused in this study. The seasonal variations of vertical profiles of stable isotopes in water vapor were analyzed, and the relationships between stable isotopes and meteorological parameters as well as ENSO were also studied. The results show that the simulated value of δ18O in water vapor was always high in July and low in January. In the vertical profile, δ18O decreased gradually with the decline of pressure. The δ18O values in precipitation and water vapor showed a consistent seasonal trend. However, δ18O in precipitation was more enriched than that in water vapor due to the influence of the Rayleigh fractionation. For the vertical profile, there was a positive correlation between air temperature and δ18O in water vapor, but the correlation was relatively weak between zonal and meridional wind speed and δ18O in water vapor, which was similar to the situations of δ18O in precipitation. In El Nio years, the δ18O in water vapor negatively correlated with SST, but the positive correlation was presented in La Nia years. The atmospheric circulation anomaly influenced air temperature and precipitation as well as the isotope composition in water vapor in the study area. To some extent, ENSO influenced the water vapor isotope across this region.

Key words:  water vapor isotope, GCM, ENSO, Urumqi