研究报告

  • 张婉君,章新平,姚天次,周慧,王学界,华明权,饶志国,贺新光.降水稳定同位素比率时间变化的iAWBM模拟[J].环境科学学报,2018,38(7):2770-2781

  • 降水稳定同位素比率时间变化的iAWBM模拟
  • Simulations of the temporal variations of precipitation stable isotopes using an isotopic atmospheric water balance model
  • 基金项目:国家自然科学基金(No.41571021,41772373);湖南省重点学科建设项目(No.2016001);湖南省研究生科研创新项目(No.CX2017B229)
  • 作者
  • 单位
  • 张婉君
  • 湖南师范大学资源与环境科学学院, 长沙 410081
  • 章新平
  • 1. 湖南师范大学资源与环境科学学院, 长沙 410081;2. 湖南师范大学地理空间大数据挖掘与应用湖南省重点实验室, 长沙 410081
  • 姚天次
  • 湖南师范大学资源与环境科学学院, 长沙 410081
  • 周慧
  • 湖南师范大学资源与环境科学学院, 长沙 410081
  • 王学界
  • 湖南师范大学资源与环境科学学院, 长沙 410081
  • 华明权
  • 湖南师范大学资源与环境科学学院, 长沙 410081
  • 饶志国
  • 湖南师范大学资源与环境科学学院, 长沙 410081
  • 贺新光
  • 1. 湖南师范大学资源与环境科学学院, 长沙 410081;2. 湖南师范大学地理空间大数据挖掘与应用湖南省重点实验室, 长沙 410081
  • 摘要:进行降水中稳定同位素比率时间变化的iAWBM模拟和比较,有助于评估模式在不同区域的适用性,改善对水循环过程中水稳定同位素变化规律的认识.本文利用iAWBM的模拟数据,分析了GNIP代表站降水中δ18O的时间变化特征、降水中δ18O与温度和降水量之间的关系、区域大气水线,并将模拟结果与实测结果进行了比较.结果表明,9个GNIP代表站的降水同位素在不同季节的变化特点均能被模拟出;各代表站模拟与实测的降水同位素长时间序列之间的相关系数达到显著的信度(p<0.001),均方根误差在一个合理的估计范围;iAWBM很好地再现了出现在维也纳、雅库茨克和渥太华站的显著温度效应,出现在香港、波哥大、昆明、哈拉雷和拉罗汤加岛站的降水量效应,以及出现在曼谷站的温度效应和降水量效应共存的特点;模拟的不同气候条件下的区域大气水线与实际大气水线相近.说明iAWBM具有模拟不同气候区降水中稳定同位素时间变化的能力.
  • Abstract:Simulations and comparisons of the temporal variations of stable isotopes in precipitation by iAWBM are helpful to assess the applicability of model in different regions and to enhance our understanding of the variations of water stable isotopes in water cycle. Using the simulation data by the isotope enabled Atmospheric Water Balance Model (iAWBM), the temporal variations of δ18O in precipitation, stable isotopic effects in precipitation, and the regional Meteoric Water Line (MWL) in representative GNIP stations are analyzed, through the comparison between simulations and GNIP observations. Results show that the distinct seasonal variation of δ18O in precipitation in all representative GNIP stations are well simulated, and the correlation coefficients between the simulated and observed time series of δ18O in precipitation in representative stations all reached the confidence level of 0.001 with the root mean square error in a reasonable estimation range. The simulations reproduce well the significant temperature effects observed in Vienna, Yakutsk, and Ottawa stations, the amount effects observed in Hongkong, Bogota, Kunming, Harare, and Rarotonga stations, as well as the coexistence of temperature effect and amount effect observed in Bangkok station, respectively. The simulated MWLs all are closer to the observed ones in different climatic conditions. These results show that iAWBM has the capability of simulating the temporal variations of stable isotopes in precipitation in different climatic regions.

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