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Projected Changes of palmer drought severity index under an RCP8.5 Scenario

Atmospheric and Oceanic Science Letters 2013年第5期6卷 273-278页

作者： ZHOU Tian-Jun HONG Tao State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric Physics Chinese Academy of Sciences Climate Change Research Center Chinese Academy of Sciences University of Chinese Academy of Sciences

The potential change of drought measured by the palmer drought severity index （PDSI） is projected by using a coupled climate system model under a Representative Pathway 8.5 （RCP8.5） *** PDSI changes calculated by two potential evapotranspiration algorithms are *** algorithm of Thomthwaite equation overestimates the impact of surface temperature on evaporation and leads to an unrealistic increasing of drought *** PM algorithm based on the Penman-Monteith equation is physically reasonably and necessary for climate change *** Flexible Global Ocean-Atmosphere-Land System model,Spectral Version 2 （FGOALS-s2） projects an increasing trend of drought during 2051-2100 in tropical and subtropical areas of North and South America,North Africa,South Europe,Southeast Asia,and the Australian *** the moderate drought （PDSI ＜-2） and extreme drought （PDSI ＜-4） areas show statistically significant increasing trends under an RCP8.5 *** uncertainty in the model projection is also discussed.

关键词： palmer drought severity index projection RCP8.5 scenario climate model

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Performance of different drought indices for agriculture drought in the North China Plain

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Journal of Arid Land 2018年第4期10卷 507-516页

作者： LIU Xianfeng ZHU Xiufang PAN Yaozhong BAI Jianjun LI Shuangshuang School of Geography and Tourism Shaanxi Normal University Institute of Remote Sensing Science and Engineering Faculty of Geographical Sciences Beijing Normal University

The palmer drought severity index （PDSI）, standardized precipitation index （SPI）, and standardized precipitation evapotranspiration index （SPEI） are used worldwide for drought assessment and monitoring. However, substantial differences exist in the performance for agricultural drought among these indices and among regions. Here, we performed statistical assessments to compare the strengths of different drought indices for agricultural drought in the North China Plain. Small differences were detected in the comparative performances of SPI and SPEI that were smaller at the long-term scale than those at the short-term scale. The correlation between SPI/SPEI and PDSI considerably increased from 1- to 12-month lags, and a slight decreasing trend was exhibited during 12- and 24-month lags, indicating a 12-month scale in the PDSI, whereas the SPI was strongly correlated with the SPEI at 1- to 24-month lags. Interestingly, the correlation between the trend of temperature and the mean absolute error and its correlation coefficient both suggested stronger relationships between SPI and the SPEI in areas of rapid climate warming. In addition, the yield-drought correlations tended to be higher for the SPI and SPEI than that for the PDSI at the station scale, whereas small differences were detected between the SPI and SPEI in the performance on agricultural systems. However, large differences in the influence of drought conditions on the yields of winter wheat and summer maize were evident among various indices during the crop-growing season. Our findings suggested that multi-indices in drought monitoring are needed in order to acquire robust conclusions.

关键词： agriculture drought palmer drought severity index standardized precipitation index standardize dprecipitation evapotranspiration index North China Plain

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维普期刊数据库

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Meteorological drought in semi-arid regions:A case study of Iran

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Journal of Arid Land 2022年第11期14卷 1212-1233页

作者： Hushiar HAMARASH Rahel HAMAD Azad RASUL Scientific Research Center Soran UniversitySoran 44008Iraq Faculty of Arts Department of GeographySoran UniversitySoran 44008Iraq

drought occurs in almost all climate zones and is characterized by prolonged water deficiency due to unbalanced demand and supply of water,persistent insufficient precipitation,lack of moisture,and high *** caused by insufficient precipitation is a temporary and recurring meteorological *** in semi-arid regions is different from that in other regions,ranging from 50 to 750 *** general,the semi-arid regions in the west and north of Iran received more precipitation than those in the east and *** Terrestrial Climate(TerraClimate)data,including monthly precipitation,minimum temperature,maximum temperature,potential evapotranspiration,and the palmer drought severity index(PDSI)developed by the University of Idaho,were used in this *** PDSI data was directly obtained from the Google Earth Engine *** Standardized Precipitation index(SPI)and the Standardized Precipitation Evapotranspiration index(SPEI)on two different scales were calculated in time series and also both SPI and SPEI were shown in spatial distribution *** result showed that normal conditions were a common occurrence in the semi-arid regions of Iran over the majority of years from 2000 to 2020,according to a spatiotemporal study of the SPI at 3-month and 12-month time scales as well as the SPEI at 3-month and 12-month time ***,the PDSI detected extreme dry years during 2000-2003 and in 2007,2014,and *** many semi-arid regions of Iran,the SPI at 3-month time scale is higher than the SPEI at 3-month time scale in 2000,2008,2014,2015,and *** general,this study concluded that the semi-arid regions underwent normal weather conditions from 2000 to *** a way,moderate,severe,and extreme dry occurred with a lesser percentage,gradually *** to the PDSI,during 2000-2003 and 2007-2014,extreme dry struck practically all hot semi-arid regions of *** parts of the cold semi-arid regions,on the other hand,only ex

关键词： meteorological drought precipitation Standardized Precipitation index Standardized Precipitation Evapotranspiration index palmer drought severity index Iran

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