基于CMIP6的气象干旱严重程度持续时间变化的预测
Farhad Behzadi1, Saman Javadi2, Hossein Yousefi3
1Department of Water Engineering, Faculty of Agricultural Technology, University of Tehran, Tehran, Iran.
Scientific reports
|February 29, 2024
概括
气候变化将加剧整个伊朗的干旱严重程度和持续时间. 预测显示气温上升和降水变化,预计将出现严重干旱,特别是在中部,东部和东南部地区.
科学领域:
- 气候科学 气候科学
- 环境科学 环境科学
- 干旱分析 干旱分析
背景情况:
- 气候变化对全球水资源构成重大威胁.
- 由于伊朗的地理位置,伊朗特别容易受到干旱和干旱的影响.
- 了解未来的干旱模式对于有效管理水资源至关重要.
研究的目的:
- 评估气候变化对伊朗干旱特征的影响.
- 用CMIP6模型和不同的排放场景分析未来干旱预测.
- 确定最容易遭受严重和长期干旱的地区.
主要方法:
- 从三个相结合模型对比项目第六阶段 (CMIP6) 模型的利用输出:CanESM5,GFDL-ESM4和IPSL-CM6A-LR.
- 雇员共享社会经济路径 (SSP1-2.6和SSP5-8.5) 和干旱指数 (SPI和SPEI).
- 分析了降水量,温度和干旱严重程度和持续时间的预测变化.
主要成果:
- 在遥远的未来 (2051-2100年) 预计所有地区的平均年降水量都会增加.
- 平均最低和最高温度的显著上升 (分别高达4.85°C和4.9°C).
- 预计严重干旱,第5集群 (SPI) 和伊朗东南部 (SPEI) 面临最长的持续时间 (分别为6年和20年) 和最严重的严重性.
结论:
- 预计气候变化将放大干旱的严重程度,并延长伊朗的干旱持续时间.
- 预计伊朗中部,东部和东南部将是受影响最严重的地区.
- 这些发现凸显了迫切需要适应性水资源管理战略,以减轻干旱影响.
相关概念视频
Precipitation and Co-precipitation
1.8K
Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
1.8K
Precipitation Processes
446
The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
446
Global Climate Change
24.4K
Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
24.4K
What is Weather?
18.2K
Overview
18.2K
Precipitation Gravimetry
6.4K
Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
6.4K
What is Climate?
18.5K
Climate refers to the prevailing weather conditions in a specific area over an extended period. As the saying goes, “Climate is what you expect. Weather is what you get.” Climate is influenced by geographic factors, such as latitude, terrain, and proximity to bodies of water.
18.5K


