首页> 外文期刊>International Journal of Climatology: A Journal of the Royal Meteorological Society >Standardized precipitation evapotranspiration index (SPEI) revisited: parameter fitting, evapotranspiration models, tools, datasets and drought monitoring
【24h】

Standardized precipitation evapotranspiration index (SPEI) revisited: parameter fitting, evapotranspiration models, tools, datasets and drought monitoring

机译:重新考虑了标准的降水蒸散指数(SPEI):参数拟合,蒸散模型,工具,数据集和干旱监测

获取原文
获取原文并翻译 | 示例
           

摘要

The standardized precipitation evapotranspiration index (SPEI) was developed in 2010 and has been used in an increasing number of climatology and hydrology studies. The objective of this article is to describe computing options that provide flexible and robust use of the SPEI. In particular, we present methods for estimating the parameters of the log-logistic distribution for obtaining standardized values, methods for computing reference evapotranspiration (ET_0), and weighting kernels used for calculation of the SPEI at different time scales. We discuss the use of alternative ET_0 and actual evapotranspiration (ETa) methods and different options on the resulting SPEI series by use of observational and global gridded data. The results indicate that the equation used to calculate ET_0 can have a significant effect on the SPEI in some regions of the world. Although the original formulation of the SPEI was based on plotting-positions Probability Weighted Moment (PWM), we now recommend use of unbiased PWM for model fitting. Finally, we present new software tools for computation and analysis of SPEI series, an updated global gridded database, and a real-time drought-monitoring system.
机译:标准化的降水蒸散指数(SPEI)于2010年制定,并已用于越来越多的气候学和水文学研究中。本文的目的是描述可灵活灵活地使用SPEI的计算选项。特别是,我们提出了用于估计对数逻辑分布的参数以获得标准化值的方法,用于计算参考蒸散量(ET_0)的方法以及用于计算不同时间尺度的SPEI的加权核。我们通过使用观测性和整体网格数据,讨论了替代ET_0和实际蒸散(ETa)方法的使用以及所得SPEI系列的不同选择。结果表明,用于计算ET_0的方程式可能会对世界某些地区的SPEI产生重大影响。尽管SPEI的原始公式是基于绘制位置的概率加权矩(PWM),但现在我们建议使用无偏PWM进行模型拟合。最后,我们提供了用于SPEI系列计算和分析的新软件工具,一个更新的全球网格数据库以及一个实时干旱监测系统。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号