首页> 美国卫生研究院文献>Scientific Reports >Multivariate assessment and attribution of droughts in Central Asia
【2h】

Multivariate assessment and attribution of droughts in Central Asia

机译:中亚干旱的多变量评估和归因

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务,本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文,但由于OA文献来源多样且变更频繁,仍可能出现获取不到、文献不完整或与标题不符等情况,如果获取不到我们将提供退款服务。请知悉。

摘要

While the method for estimating the Palmer Drought Severity Index (PDSI) is now more closely aligned to key water balance components, a comprehensive assessment for measuring long-term droughts that recognizes meteorological, agro-ecological and hydrological perspectives and their attributions is still lacking. Based on physical approaches linked to potential evapotranspiration (PET), the PDSI in 1965–2014 showed a mixture of drying (42% of the land area) and wetting (58% of the land area) that combined to give a slightly wetting trend (0.0036 per year). Despite the smaller overall trend, there is a switch to a drying trend over the past decade (−0.023 per year). We designed numerical experiments and found that PDSI trend responding to the dramatic increase in air temperature and slight change in precipitation. The variabilities of meteorological and agro-ecological droughts were broadly comparable to various PDSI drought index. Interestingly, the hydrological drought was not completely comparable to the PDSI, which indicates that runoff in arid and semi-arid regions was not generated primarily from precipitation. Instead, fraction of glacierized areas in catchments caused large variations in the observed runoff changes.
机译:虽然现在估算帕尔默干旱严重性指数(PDSI)的方法与关键的水平衡要素更加紧密地结合在一起,但仍缺乏用于衡量长期干旱的综合评估方法,该方法可以识别气象,农业生态和水文方面的观点及其属性。根据与潜在蒸散量(PET)相关的物理方法,1965年至2014年的PDSI显示出干燥(占土地面积的42%)和润湿(占土地面积的58%)的混合物,两者共同给出了轻微的润湿趋势(每年0.0036)。尽管总体趋势较小,但在过去十年中(每年-0.023)有转向干燥的趋势。我们设计了数值实验,发现PDSI趋势响应于气温的急剧上升和降水的轻微变化。气象和农业生态干旱的变异性可与各种PDSI干旱指数大致相比。有趣的是,水文干旱不能完全与PDSI相提并论,这表明干旱和半干旱地区的径流并非主要来自降水。取而代之的是,流域中冰川化的区域的一部分引起了观测到的径流变化的巨大变化。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

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